Improve Caregivers Psychological and Physiological Health with Meditation

Improve Caregivers Psychological and Physiological Health with Meditation

 

By John M. de Castro, Ph.D.

 

Feel overwhelmed with the responsibilities of caring for a loved one? One of the most effective ways to avoid burnout is engaging in a mindfulness practice like meditation.” – Audrey Meinertzhagen

 

There is a tremendous demand for caregiving in the US. It is estimated that over 65 million (29% of the adult population) provides care to someone who is ill, disabled or aged, averaging 20 hours per week spent caring for their loved ones. This caregiving comes at a cost exacting a tremendous toll on caregivers’ health and well-being. Caregiving has been associated with increased levels of depression and anxiety as well as higher use of psychoactive medications, poorer self-reported physical health, compromised immune function, and increased mortality. Mindfulness practice for caregivers has been shown to help them cope with the physical and psychological demands of caregiving.

 

In today’s Research News article “Effects of Meditation on Mental Health and Cardiovascular Balance in Caregivers.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7828286/ ) Díaz-Rodríguez and colleagues recruited caregivers for dependent family members for at least 2 years. They were assigned to either no treatment or to receive twice weekly, 2-hour, sessions of focused meditation training on the basis of availability for the training sessions. They were measured before and after training for happiness, anxiety, depression, heart rate, heart rate variability, and blood pressure.

 

They found that in comparison to baseline and the control group, the group that received meditation training were significant higher in happiness and heart rate variability and significantly lower in anxiety, heart rate, and blood pressure. Hence meditation training improved the mental health and cardiovascular balance of caregivers.

 

These are excellent results. A higher level of heart rate variability is an indicator of increased parasympathetic and reduced sympathetic nervous system activity. Hence, the relaxation promoting portion of the autonomic nervous system increases while the portion promoting activation and arousal decreases. This is further evidenced by the significant decrease in heart rate and blood pressure. This suggest that a 4-week training in meditation improves caregivers’ psychological and physiological state. The effectiveness of the caregiving was not measured but based upon the improvements observed it would be expected that the quality of caregiving would also be improved. This suggests that meditation training should be recommended for caregivers.

 

So, improve caregivers psychological and physiological health with meditation.

 

Caregiving is a tough job and the stress can seriously affect your physical and mental health. An effective and simple way to combat that is to meditate.” – Daily Caring

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Díaz-Rodríguez, L., Vargas-Román, K., Sanchez-Garcia, J. C., Rodríguez-Blanque, R., Cañadas-De la Fuente, G. A., & De La Fuente-Solana, E. I. (2021). Effects of Meditation on Mental Health and Cardiovascular Balance in Caregivers. International journal of environmental research and public health, 18(2), 617. https://doi.org/10.3390/ijerph18020617

 

Abstract

Background: Caring for a loved one can be rewarding but is also associated with substantial caregiver burden, developing mental outcomes and affecting happiness. The aim of this study was to determine the effects of a four-week, 16-h presential meditation program on physiological and psychological parameters and vagal nerve activity in high-burden caregivers, as compared to a control group. Methods: A non-randomized repeated-measures controlled clinical trial was conducted. Results: According to the ANCOVA results, the global happiness score (F = 297.42, p < 0.001) and the scores for all subscales were significantly higher in the experimental group than in the control group at 5 weeks. Anxiety levels were also significantly reduced in the experimental group (F = 24.92, p < 0.001), systolic (F = 16.23, p < 0.001) and diastolic blood (F = 34.39, p < 0.001) pressures, and the resting heart rate (F = 17.90, p < 0.05). HRV results revealed significant between-group differences in the HRV Index (F = 8.40, p < 0.05), SDNN (F = 13.59, p < 0.05), and RMSSD (F = 10.72, p < 0.05) in the time domain, and HF (F = 4.82 p < 0.05)) in the frequency domain, which were all improved in the experimental group after the meditation program. Conclusions: Meditation can be a useful therapy to enhance the mental health and autonomic nervous system balance of informal caregivers, improving symptoms of physical and mental overload.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7828286/

 

Improve Stress Responding, Health, and Well-Being with Qigong

Improve Stress Responding, Health, and Well-Being with Qigong

 

By John M. de Castro, Ph.D.

 

Qigong is an extraordinary tool for reducing the harmful effects of stress. The three pillars of qigong practice are body, breath, and mind. If your body is relaxed your breathing will slow down. When your breath is slow, you feel more centered, more calm, and more in touch with yourself” – Kenneth Cohen

 

Tai Chi and Qigong are ancient mindfulness practices involving slow prescribed movements. They are gentle and completely safe, can be used with the elderly and sickly, are inexpensive to administer, can be performed in groups or alone, at home or in a facility or even public park, and can be quickly learned. In addition, they can also be practiced in social groups without professional supervision. This can make it fun, improving the likelihood of long-term engagement in the practice.

 

Tai Chi and Qigong are both mindfulness practices and gentle exercises. They have been shown to be beneficial for the health and well-being of individuals of a variety of ages, but particularly the elderly. They also improve the symptoms of a variety of diseases. One way that these practices may improve health and well-being is by reducing stress. The studies of the benefits for health of Tai Chi and Qigong are accumulating and so it makes sense to take a moment to summarize what has been learned about the benefits of Qigong practice.

 

In today’s Research News article “Individual Stress Prevention through Qigong.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7579037/ )  van Dam reviews and summarizes the published research studies of the effects of Qigong practice on stress. She reports that the published studies found that Qigong practice improves the cardiovascular system including a significant reduction in blood pressure and an increase in heartrate variability, an indicator of parasympathetic relaxation. It improves the respiratory system including increased lung capacity, oxygen intake and breathing patterns. It improves immune function and reduces inflammatory responses. It improves both psychological and physiological responses to stress. It improves sleep quality and reduces fatigue. It reduces depression and both acute and chronic anxiety.

 

These findings are remarkable and suggest that this gentle safe practice markedly improves the physical and mental well-being and health of the practitioners. Many of these benefits may result from the ability of Qigong practice to improve stress responding. Stress impairs health and well-being and Qigong practice appears to counteract these effects.

 

So, improve stress responding, health, and well-being with Qigong.

 

Qi Gong helps you develop a crystal clear mind as you connect with the present moment, letting go of the stress of daily life and relaxing deeply.”- Nick Jankel

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

van Dam K. (2020). Individual Stress Prevention through Qigong. International journal of environmental research and public health, 17(19), 7342. https://doi.org/10.3390/ijerph17197342

 

Abstract

Owing to work intensification and an accelerated pace of life in general, individuals in many Western countries are often overactivated and find it difficult to switch off. However, recovery from physiological and mental activation is critical to prevent stress symptoms and maintain one’s physiological and mental well-being. Extensive research evidence indicates that Qigong, a traditional Chinese movement practice for promoting health, provides an effective means to recover from work and off-work demands. The main objective of this paper is to offer a comprehensive, narrative review of the effects of Qigong and its core components. Attention is first paid to the outcomes of work and off-work demands and stress, and the role of recovery for individuals’ well-being. Then, Qigong and its components are explained, followed by the results of scientific research. Finally, limitations and implications for research and practiced are discussed.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7579037/

 

Improve Autonomic Nervous System Function Reducing Stress with Online Mindfulness Training

Improve Autonomic Nervous System Function Reducing Stress with Online Mindfulness Training

 

By John M. de Castro, Ph.D.

 

“Research has found that meditation can positively affect a measure of heart health known as heart rate variability (HRV). HRV reflects how quickly your heart makes small changes in the time interval between each heartbeat. A high HRV is a sign of healthier heart. . . With regular meditation, you may be able to raise your HRV. – Harvard Mens Health

 

In our lives we are confronted with a variety of situations and environments. In order to successfully navigate these differing situations, we must be able to adapt and self-regulate. The Autonomic Nervous System (ANS) is designed to adapt physiologically to the varying demands on us. It is composed of 2 divisions; the sympathetic division underlies activation, including increases in heart rate and blood pressure, while the parasympathetic division underlies relaxation, including decreases in heart rate and blood pressure. A measure of the balance between these systems is provided by the variability of the heart rate.

 

Heart Rate Variability (HRV) refers to the change in the time intervals between consecutive heart beats. Higher levels of HRV are indicative of flexibility in the Autonomic Nervous System and are associated with adaptability to varying environments. Mindfulness has been associated with psychological flexibility and a greater ability to adapt appropriately to differing situations. Indeed, mindfulness practice improves Heart Rate Variability (HRV). It makes sense to explore the ability of real world mindfulness training with an online app to improve autonomic nervous system function as measured by heart rate variability.

 

In today’s Research News article “Heart rate variability is enhanced during mindfulness practice: A randomized controlled trial involving a 10-day online-based mindfulness intervention.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7746169/ ) Kirk and Axelsen recruited healthy adults online and randomly assigned them to either a mindfulness, music, or no treatment control group. The mindfulness group received mindfulness training with a smartphone app (Headspace) while the music group listened to music also with a smartphone app for 10 days. Before and after training they were measured for mindfulness, sleep quality, perceived stress, and respiration rate and had their electrocardiogram measured to determine heart rate and heart rate variability.

 

They found that in comparison to baseline and the no-treatment control group, the mindfulness training group had significantly greater mindfulness and sleep quality and significantly lower perceived stress. Although the music group also had a reduction in perceive stress, the mindfulness group had a significantly greater reduction.

 

They found that during the mindfulness and music sessions there were significant increases in heart rate variability but only during the mindfulness sessions was there a significant reduction in respiration rate. Outside of the sessions, they found that the mindfulness group and not the music or control groups had significant increases in heart rate variability during the daytime, nighttime, and during sleep.

 

This was a well-controlled study in that an active as well as passive control conditions were present. So, clear conclusions about causation can be reached. The results suggest that mindfulness trained with a smartphone app increases heart rate variability both acutely, during the sessions, and chronically, outside of the training sessions across the day including during sleep. These increases in heart rate variability suggest an increase in parasympathetic activity and a decrease in sympathetic activity. These reflect an improved balance and relaxation in the autonomic nervous system. These increases in heart rate variability are physiological measures reflecting the psychological measures of decreased perceived stress and improved sleep quality. Hence, online mindfulness training of relatively short duration is capable of improving both physiological and psychological indicators of stress and improving sleep.

 

So, improve autonomic nervous system function reducing stress with online mindfulness training.

 

Generally speaking, a low and irregular HRV indicates a stressed state and a high and regular HRV indicates a relaxed state such as mindfulness.” – Mindfio

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Kirk, U., & Axelsen, J. L. (2020). Heart rate variability is enhanced during mindfulness practice: A randomized controlled trial involving a 10-day online-based mindfulness intervention. PloS one, 15(12), e0243488. https://doi.org/10.1371/journal.pone.0243488

 

Abstract

Objectives

The goal of the present study was to probe the effects of mindfulness practice in a naturalistic setting as opposed to a lab-based environment in the presence of continuous heart rate variability (HRV) measurements. The specific experimental goals were to examine the effects of a brief 10-day online-based mindfulness intervention on both chronic and acute HRV responses.

Method

We conducted a fully randomized 10-day longitudinal trial of mindfulness practice, explicitly controlling for practice effects with an active-control group (music listening) and a non-intervention control group. To assess chronic cardiovascular effects, we asked participants in the 3 groups to complete 2-day HRV pre- and post-intervention measurement sessions. Using this experimental setup enabled us to address training effects arising from mindfulness practice to assess physiological impact on daytime as well as nighttime (i.e. assessing sleep quality) on the underlying HRV response. To assess acute cardiovascular effects, we measured HRV in the 2 active intervention groups during each of the 10 daily mindfulness or music sessions. This allowed us to track the development of purported training effects arising from mindfulness practice relative to the active-control intervention in terms of changes in the HRV slope over the 10-day time-course.

Results

Firstly, for the acute phase we found increased HRV during the daily practice sessions in both the mindfulness and active-control group indicating that both interventions were effective in decreasing acute physiological stress. Secondly, for the chronic phase we found increased HRV in both the day- and nighttime indicating increased sleep quality, specifically in the mindfulness group.

Conclusion

These results suggest causal effects in both chronic and acute phases of mindfulness practice in formerly naïve subjects and provides support for the argument that brief online-based mindfulness interventions exert positive impact on HRV.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7746169/

 

Improve Autonomic Nervous System Function and Well-Being in Cancer Survivors with Mind-Body Practices.

Improve Autonomic Nervous System Function and Well-Being in Cancer Survivors with Mind-Body Practices.

 

By John M. de Castro, Ph.D.

 

“Tai Chi and Qigong are ancient forms of exercise that fit the bill for helping patients with cancer get moving and improve their overall sense of well-being. Tai Chi practice can help with pain conditions, especially pain involving muscles and joints; it can also reduce stress and anxiety and improve the quality of sleep.” – Susan Yaguda

 

Receiving a diagnosis of cancer has a huge impact on most people. Feelings of depression, anxiety, and fear are very common and are normal responses to this life-changing and potentially life-ending experience. But cancer diagnosis is not necessarily a death sentence. Over half of the people diagnosed with cancer are still alive 10 years later and this number is rapidly increasing. But, surviving cancer carries with it a number of problems. Anxiety, depression, fatigue and insomnia are common symptoms in the aftermath of surviving breast cancer. These symptoms markedly reduce the quality of life of the patients.

 

Mindfulness training has been shown to help with cancer recovery and help to relieve chronic pain. It can also help treat the residual physical and psychological symptoms, including stress, sleep disturbancefear, and anxiety and depression. Mind-body practices such as Tai Chi or Qigong, and yoga have been shown to be effective in improving the psychological symptoms occurring in breast cancer patients. These practices work to relieve the emotional distress of cancer survivors.

 

A potential mechanism by which mind-body practices may relieve emotional distress is by altering the balance in the autonomic nervous system. A measure of this balance is Heart Rate Variability (HRV). It refers to the change in the time intervals between consecutive heart beats. Higher levels of HRV are indicative of flexibility in the Autonomic Nervous System and are associated with adaptability to varying environments. Increased heart rate variability signals greater relaxation in the autonomic nervous system with a predominance of parasympathetic (relaxation) activity over sympathetic (activation) activity. This all signals greater physiological relaxation.

 

In today’s Research News article “Mind-Body and Psychosocial Interventions May Similarly Affect Heart Rate Variability Patterns in Cancer Recovery: Implications for a Mechanism of Symptom Improvement.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7425257/ ) Larkey and colleagues recruited female breast cancer survivors and randomly assigned them to receive 12 weeks of either Tai Chi or Sham-Tai Chi practice. Sham-Tai Chi used the same movements but did not incorporate breath control or meditative states. They were measured before and after training for fatigue, sleep, and depression and the electrocardiogram was measured and analyzed for Heart Rate Variability (HRV).

 

They found that after Tai Chi Practice, but not Sham-Tai Chi, there were significant reductions in fatigue and depression and significant improvements in sleep. In addition, in the Tai Chi group there was a significant reduction in low coherence Heart Rate Variability (HRV). Also, the greater the change, over training, in high coherence HRV the greater the reduction in depression levels.

 

This study replicates previous findings that Tai Chi practice reduces fatigue, and depression, and improves sleep. And produces changes in Heart Rate Variability (HRV). But this study used a unique control, comparison, condition of Sham-Tai Chi that had the same movements but lacked the breath control and meditative state of true Tai Chi practice. This suggests that it is not the movements of Tai Chi that produces the benefits but the mindfulness components that are essential.

 

The study also presents some evidence as to the mechanism by which Tai Chi practice improves that physical and psychological state of cancer survivors. The observed changes in Heart Rate Variability (HRV) are indicative of greater relaxation in the autonomic nervous system with a predominance of parasympathetic (relaxation) activity over sympathetic (activation) activity. This suggests that Tai Chi practice results in a physiological relaxation that in turn may be responsible for the physical and psychological benefits of the practice.

 

Some advantages of Tai Chi practice include the facts that it is not strenuous, involves slow gentle movements, and is safe, having no appreciable side effects, it is appropriate for all ages including the elderly and for individuals with illnesses that limit their activities or range of motion. It can also be practiced without professional supervision and in groups making it inexpensive to deliver and fun to engage in. This makes Tai Chi practice an excellent means to improve the physical and psychological symptoms experienced by cancer survivors.

 

So, improve autonomic nervous system function and well-being in cancer survivors with mind-body practices.

 

Research in breast cancer patients has shown that tai chi may help to increase strength, balance, flexibility, heart and lung function, [and] feelings of well-being.” – Breast Cancer.org

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Larkey, L., Kim, W., James, D., Kishida, M., Vizcaino, M., Huberty, J., & Krishnamurthi, N. (2020). Mind-Body and Psychosocial Interventions May Similarly Affect Heart Rate Variability Patterns in Cancer Recovery: Implications for a Mechanism of Symptom Improvement. Integrative cancer therapies, 19, 1534735420949677. https://doi.org/10.1177/1534735420949677

 

Abstract

Background:

Advancements in early detection and treatment of cancer have led to increased survival rates and greater need to identify effective supportive care options for resolving symptoms of survivorship. Many non-pharmacological approaches to symptom management during and after cancer treatment involve emotional self-regulation as a central strategy for improving well-being. Identifying commonalities among these strategies’ mechanisms of action may facilitate understanding of what might be useful for optimizing intervention effects. Heart rate variability (HRV) parameters are indicative of improved autonomic nervous system (ANS) balance and resiliency and reduced emotional distress and are thus identified as a mechanism to discuss as a marker of potential for intervention efficacy and a target for optimization.

Methods:

HRV data from 2 studies, 1 examining a mind-body intervention and 1 examining a psychosocial intervention, are presented as a point of discussion about preliminary associations between the interventions, change in HRV, and emotional distress reduction.

Results:

HRV significantly decreased in sympathetic activity in response to a mind-body intervention (Qigong/Tai Chi), and increased vagal tone in response to a psychosocial (storytelling) intervention. In both, these changes in HRV parameters were associated with improved emotional states.

Conclusion:

Our preliminary data suggest that HRV may serve as an important marker of underlying changes that mediate emotional regulation; this observation deserves further investigation. If identified as a worthy target, focusing on interventions that improve HRV within the context of interventions for cancer patients may be important to key outcomes and clinical practice.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7425257/

 

Normalize Heart Rate Processes with Yoga Practice

Normalize Heart Rate Processes with Yoga Practice

 

By John M. de Castro, Ph.D.

 

Heart Rate Variability is the ability of the heart rate to change from beat to beat., which is based off the activity of the nervous system. HRV is a more accurate measure of a person’s health than examining only the heart rate.” – Zelinda Yañez

 

In our lives we are confronted with a variety of situations and environments. In order to successfully navigate these differing situations, we must be able to adapt and self-regulate. The Autonomic Nervous System (ANS) is designed to adapt physiologically to the varying demands on us. It is composed of 2 divisions; the sympathetic division underlies activation, including increases in heart rate and blood pressure, while the parasympathetic division underlies relaxation, including decreases in heart rate and blood pressure. A measure of the balance between these systems is provided by the variability of the heart rate.

 

Heart Rate Variability (HRV) refers to the change in the time intervals between consecutive heart beats. Higher levels of HRV are indicative of flexibility in the Autonomic Nervous System and are associated with adaptability to varying environments. Mindfulness has been associated with psychological flexibility and a greater ability to adapt appropriately to differing situations. Indeed, mindfulness practice improves Heart Rate Variability (HRV). It makes sense to determine if yoga practice can also improve heart rate variability.

 

In today’s Research News article “Changes in Heart Rate Variability after Yoga are Dependent on Heart Rate Variability at Baseline and during Yoga: A Study Showing Autonomic Normalization Effect in Yoga-Naïve and Experienced Subjects.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7336948/) Shinba and colleagues recruited adults who were either experienced yoga practitioners or yoga naïve. The engaged in 20 minutes of seated breath awareness and yogic breathing exercises. Their electrocardiogram heart rates were recorded before, during, and after the practice.

 

They found that the low frequency component of heart rate variability and the ratio of the low frequency to the high frequency component were normalized after yoga practice such that when the baseline levels were low the components increased as a result of yoga practice and when the baseline levels were high the components decreased. No significant changes in the high frequency component was observed.

 

The results do not replicate previous findings that yoga practice increases the high frequency component of heart rate variability reflecting an increase in parasympathetic activity which is associated with physiological relaxation. This lack of replication may be due to the brevity of the practice or to the nature of the practice where only breath awareness and breathing exercises were included. It is possible that more active components such as postures are needed to produce increases in parasympathetic activity.

 

The low frequency component of heart rate variability reflects the regulation of the heart rate based upon blood pressure. This reflects the maintenance of an adequate blood flow at all times. Hence, the present brief breath-oriented yoga practice appears to regularize blood flows. This, in turn, may reflect an increased ability of the physiology to deal with stresses.

 

So, normalize heart rate processes with yoga practice.

 

“HRV is an interesting and noninvasive way to identify these ANS imbalances. If a person’s system is in more of a fight-or-flight mode, the variation between subsequent heartbeats is low. If one is in a more relaxed state, the variation between beats is high. In other words, the healthier the ANS the faster you are able to switch gears, showing more resilience and flexibility.” – Marcelo Campos

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Shinba, T., Inoue, T., Matsui, T., Kimura, K. K., Itokawa, M., & Arai, M. (2020). Changes in Heart Rate Variability after Yoga are Dependent on Heart Rate Variability at Baseline and during Yoga: A Study Showing Autonomic Normalization Effect in Yoga-Naïve and Experienced Subjects. International journal of yoga, 13(2), 160–167. https://doi.org/10.4103/ijoy.IJOY_39_19

 

Abstract

Background:

Yoga therapy is widely applied to the maintenance of health and to treatment of various illnesses. Previous researches indicate the involvement of autonomic control in its effects, although the general agreement has not been reached regarding the acute modulation of autonomic function.

Aim:

The present study aimed at revealing the acute effect of yoga on the autonomic activity using heart rate variability (HRV) measurement.

Methods:

Twenty-seven healthy controls participated in the present study. Fifteen of them (39.5 ± 8.5 years old) were naïve and 12 (45.1 ± 7.0 years old) were experienced in yoga. Yoga skills included breath awareness, two types of asana, and two types of pranayama. HRV was measured at the baseline, during yoga, and at the resting state after yoga.

Results:

In both yoga-naïve and experienced participants, the changes in low-frequency (LF) component of HRV and its ratio to high-frequency (HF) component (LF/HF) after yoga were found to be correlated negatively with the baseline data. The changes in LF after yoga were also correlated with LF during yoga. The changes in HF as well as the raw HRV data after yoga were not related to the baseline HRV or the HRV during yoga.

Conclusion:

The results indicate that yoga leads to an increase in LF when LF is low and leads to a decrease in LF when it is high at the baseline. This normalization of LF is dependent on the autonomic modulation during yoga and may underlie the clinical effectiveness of yoga therapy both in yoga-naïve and experienced subjects.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7336948/

 

Lower Heart Rate and Increase its Variability with Meditation

Lower Heart Rate and Increase its Variability with Meditation

 

By John M. de Castro, Ph.D.

 

If a person’s system is in more of a fight-or-flight mode, the variation between subsequent heartbeats is low. If one is in a more relaxed state, the variation between beats is high. In other words, the healthier the ANS the faster you are able to switch gears, showing more resilience and flexibility. Over the past few decades, research has shown a relationship between low HRV and worsening depression or anxiety. A low HRV is even associated with an increased risk of death and cardiovascular disease.” – Marcelo Campos

 

In our lives we are confronted with a variety of situations and environments. In order to successfully navigate these differing situations, we must be able to adapt and self-regulate. The Autonomic Nervous System (ANS) is designed to adapt physiologically to the varying demands on us. It is composed of 2 divisions; the sympathetic division underlies activation, including increases in heart rate and blood pressure, while the parasympathetic division underlies relaxation, including decreases in heart rate and blood pressure. A measure of the balance between these systems is provided by the variability of the heart rate.

 

Heart Rate Variability (HRV) refers to the change in the time intervals between consecutive heart beats. Higher levels of HRV are indicative of flexibility in the Autonomic Nervous System and are associated with adaptability to varying environments. Mindfulness has been associated with psychological flexibility and a greater ability to adapt appropriately to differing situations. It makes sense then to investigate the relationship of mindfulness to and Heart Rate Variability (HRV).

 

In today’s Research News article “Meditation Practice Improves Short-Term Changes in Heart Rate Variability.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7142551/), Chang and colleagues performed 2 experiments. In the first, they recruited healthy meditation naïve adults and presented them with a 90-minute class on meditation including practice in a face to face setting once a week for 4 weeks. In the second experiment experienced meditators were recruited and received once a week for 4 weeks the 90-minute class on meditation including practice presented on video. The participants wore wrist heart rate monitors and were measured over the course of the study for heart rate, heart rate variability, and blood pressure.

 

They found that both the meditation naïve participants with face to face instruction and the experienced meditators with video instruction had significant decreases over the course of the study in heart rate and significant increases in heart rate variability. Increased heart rate variability signals greater relaxation in the autonomic nervous system with a predominance of parasympathetic (relaxation) activity over sympathetic (activation) activity. The results make sense as parasympathetic activity tends to decrease heart rate. This all signals greater physiological relaxation

 

There was no control condition in the present study. So, the experiment is open to confounding by demand characteristics, experimenter bias, expectancy (placebo) effect etc. But prior randomized controlled studies have also observed that mindfulness training reduces heart rate and increases heart rate variability. So, the present results are likely due to the meditation practice. This increase in parasympathetic activity produced by meditation training may explain why mindfulness training is effective in treating cardiovascular diseases, in overall reducing the deleterious effects of stress and producing increased relaxation.

 

So, lower heart rate and increase its variability with meditation.

 

meditation may improve your heart’s recovery from stress as demonstrated by improved Heart Rate Variability (HRV).” – Sam Sly

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Chang, K. M., Wu Chueh, M. T., & Lai, Y. J. (2020). Meditation Practice Improves Short-Term Changes in Heart Rate Variability. International journal of environmental research and public health, 17(6), 2128. https://doi.org/10.3390/ijerph17062128

 

Abstract

Background: It is well known that meditation improves the physical and psychological condition of its practitioners. This study investigated the heart rate variability response of meditation practitioners in two Chan master teaching environments, namely face-to-face and video classes. Methods: Experimental sessions were conducted, one featuring face-to-face classes and the other featuring video classes. The difference in participants’ physiological parameters (blood pressure and heart rate variability) between the two experimental sessions was determined. In the first session, physiological parameters were recorded twice, before and after one teaching course, and the second session took place one month after the first. The first and second sessions had 45 and 27 participants, respectively. Those involved in the first experiment had no experience with meditation, whereas participants in the second experiment had practiced meditation for an average of 9 years (range = 1 to 27 years). Both experiments were conducted once a week, with each session lasting 1.5 h. Results: For both experiments, both heart rate and heart rate variability by age significantly decreased after one teaching course. Conclusions: Chan meditation practitioners benefit from receiving both face-to-face and video class teaching from a Chan master.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7142551/

 

Improve Self-Compassion with Psychophysiological Flexibility and Mindfulness

Improve Self-Compassion with Psychophysiological Flexibility and Mindfulness

By John M. de Castro, Ph.D.

 

self-compassion is strongly associated with emotional wellbeing, coping with life challenges, lower levels of anxiety and depression, healthy habits such as diet and exercise, and more satisfying personal relationships. It is an inner strength that enables us to be more fully human—to acknowledge our shortcomings, learn from them, and make necessary changes with an attitude of kindness and self-respect.” – Greater Good Science Center

 

One of the more remarkable aspects of Western culture is that in general people do not like themselves. We are constantly comparing ourselves to others and since there can only one best, virtually everyone falls short. So, we constantly criticize ourselves for not being the smartest, the swiftest, the strongest, the most liked, the most handsome or beautiful. If there wasn’t something wrong with us, then we would be the best. As a result, we become focused and obsessed with our flaws. This can lead to anxiety and worry.

 

Mindfulness promotes experiencing and accepting ourselves as we are, which is a direct antidote to seeing ourselves in comparison to others and as we wish to be. In other words, mindfulness promotes self-compassion. Self-compassion involves being warm and understanding about ourselves rather than self-criticism. If we have that attitude, we will like ourselves more and suffer less. So, it is important to study the mindfulness and self-compassion and their relationships with the ability to regulate emotional arousal.

 

In today’s Research News article “Is Dispositional Self-Compassion Associated With Psychophysiological Flexibility Beyond Mindfulness? An Exploratory Pilot Study.” (See summary below or view the full text of the study at: https://www.frontiersin.org/articles/10.3389/fpsyg.2020.00614/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1302118_69_Psycho_20200416_arts_A), Svendsen and colleagues recruited college students and had them complete scales measuring self-compassion, mindfulness, anxiety, and rumination. They also had their cardiac function measured at rest with an electrocardiogram (ECG). This was used to calculate the vagally mediated heart rate variability as a measure of psychophysiological flexibility. It measures the interplay between the parasympathetic and sympathetic branches of the autonomic nervous system, with higher heart rate variability signaling parasympathetic predominance, usually indicating relaxation.

 

Employing regression analysis, they found that the higher the levels of self-compassion the higher the levels of mindfulness and psychophysiological flexibility. They also found that both higher levels of mindfulness and also self-compassion the lower the levels of anxiety and rumination (worry). So, mindfulness is related to self-compassion and lower anxiety and rumination and self-compassion is related to mindfulness and psychophysiological flexibility and lower anxiety and rumination.

 

The findings are correlative and as such causation cannot be determined. But they show that mindfulness is significantly related to self-compassion and both are related to better mental health. In prior manipulative studies, it has been demonstrated that mindfulness causes increased self-compassion and decreased anxiety and rumination. So, the present results likely reflect causal connections.

 

The results also demonstrated that self-compassion has the strongest relationship with psychophysiological flexibility suggesting that self-compassion is related to the ability to regulate emotional arousal. It is this ability that may underlie the lower levels of anxiety and rumination found with high levels of self-compassion. Hence, mindfulness and self-compassion are important components of the mental health of young adults.

 

So, improve self-compassion with psychophysiological flexibility and mindfulness.

 

“mindfulness increases empathy and compassion for others and for oneself, and that such attitudes are good for you. To me, that affirms that when we practice mindfulness, we are simultaneously strengthening our skills of compassion.” – Shauna Shapiro

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Svendsen JL, Schanche E, Osnes B, Vøllestad J, Visted E, Dundas I, Nordby H, Binder P-E and Sørensen L (2020) Is Dispositional Self-Compassion Associated With Psychophysiological Flexibility Beyond Mindfulness? An Exploratory Pilot Study. Front. Psychol. 11:614. doi: 10.3389/fpsyg.2020.00614

 

Abstract

Background: Dispositional mindfulness and self-compassion are shown to associate with less self-reported emotional distress. However, previous studies have indicated that dispositional self-compassion may be an even more important buffer against such distress than dispositional mindfulness. To our knowledge, no study has yet disentangled the relationship between dispositional self-compassion and mindfulness and level of psychophysiological flexibility as measured with vagally mediated heart rate variability (vmHRV). The aim was thus to provide a first exploratory effort to expand previous research relying on self-report measures by including a psychophysiological measure indicative of emotional stress reactivity.

Methods: Fifty-three university students filled out the “Five Facet Mindfulness Questionnaire” (FFMQ) and the “Self-Compassion Scale” (SCS), and their heart rate was measured during a 5 min resting electrocardiogram. Linear hierarchical regression analyses were conducted to examine the common and unique variance explained by the total scores of the FFMQ and the SCS on level of resting vmHRV.

Results: Higher SCS total scores associated significantly with higher levels of vmHRV also when controlling for the FFMQ total scores. The SCS uniquely explained 7% of the vmHRV. The FFMQ total scores did not associate with level of vmHRV.

Conclusion: These results offer preliminary support that dispositional self-compassion associates with better psychophysiological regulation of emotional arousal above and beyond mindfulness

https://www.frontiersin.org/articles/10.3389/fpsyg.2020.00614/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1302118_69_Psycho_20200416_arts_A

 

Improve the Aging Brain and Well-Being with Mindfulness Training

Improve the Aging Brain and Well-Being with Mindfulness Training

 

By John M. de Castro, Ph.D.

 

On average, the brains of long-term meditators were 7.5 years younger at age 50 than the brains of non-meditators, and an additional 1 month and 22 days younger for every year after 50.”Grace Bullock

 

The aging process involves a systematic progressive decline in every system in the body, the brain included. This includes our cognitive (mental) abilities which decline with age including impairments in memory, attention, and problem-solving ability. It is inevitable and cannot be avoided. Research has found that mindfulness practices reduce the deterioration of the brain that occurs with aging restraining the loss of neural tissue. Indeed, the brains of practitioners of meditation and yoga have been found to degenerate less with aging than non-practitioners. Tai Chi and Qigong have also been shown to be beneficial in slowing or delaying physical and mental decline with aging.

 

In today’s Research News article “Long-Term Physical Exercise and Mindfulness Practice in an Aging Population.” (See summary below or view the full text of the study at: https://www.frontiersin.org/articles/10.3389/fpsyg.2020.00358/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1293822_69_Psycho_20200407_arts_A), Tang and colleagues recruited healthy older participants who practiced for an hour a day 6 – 7 days a week for 12 years either physical exercise, aerobic walking, or integrated mind-body training, including body relaxation, mental imagery and mindfulness training. The participants underwent brain imaging with functional Magnetic Resonance Imaging (fMRI). They had their heart rate, respiration. and skin conductance recorded during a fitness exercise session. Salivary Secretory immunoglobulin A (sIgA), an index of mucosal immunity and Cortisol levels, an index of stress, were measured at rest, during stress, and during training. They also completed scales measuring general health and quality of life.

 

They found that the mindfulness group had significantly higher resting heart rate and respiration, high frequency heart rate variability, quality of life, and sIgA levels and significantly lower cortisol levels and skin conductance than the exercise group. In addition, they found that the mindfulness group compared to the exercise group had significantly larger brain striatum including the caudate and putamen and significantly greater functional connectivity between the dorsal anterior cingulate cortex and the striatum and also the insula.

 

These results are interesting and suggest that long-term mindfulness practice results in differences in the psychological, physical, and neural states compared to physical exercise. Psychological well-being improvement in the mindfulness group was suggested by the greater reported quality of life. Physiological improvements in the mindfulness group were suggested by greater relaxation as indexed by greater autonomic nervous system, parasympathetic activity and measured by heart rate variability and skin conductance and lower stress hormone, cortisol, levels. The greater volume of the striatum and greater connectivity with the dorsal anterior cingulate cortex also suggest greater physiological relaxation. The mindfulness group also showed greater immune system function as indexed by sIgA levels. On the other hand, the aerobic walking group demonstrated greater physical fitness as indexed by lower resting heart rate and respiration.

 

In sum, these findings suggest the long-term aerobic walking exercise is good for the physical fitness of older adults. But long-term mindfulness training is better for their overall psychological and physical well-being. These results correspond with other prior findings that shorter-term mindfulness practice results in greater autonomic relaxation, quality of life, and neuroplastic changes in brain systems and that this training reduces the physiological and psychological deterioration occurring with aging.

 

So, improve the aging brain and well-being with mindfulness training.

 

“Mind and body practices, in particular, including relaxation techniques and meditative exercise forms such as yoga, tai chi, and qi gong are being used by older Americans, both for fitness and relaxation, and because of perceived health benefits.” –  National Center for Complementayy and Integrative Health

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Tang Y-Y, Fan Y, Lu Q, Tan L-H, Tang R, Kaplan RM, Pinho MC, Thomas BP, Chen K, Friston KJ and Reiman EM (2020) Long-Term Physical Exercise and Mindfulness Practice in an Aging Population. Front. Psychol. 11:358. doi: 10.3389/fpsyg.2020.00358

 

Abstract

Previous studies have shown that physical exercise and mindfulness meditation can both lead to improvement in physical and mental health. However, it is unclear whether these two forms of training share the same underlying mechanisms. We compared two groups of older adults with 10 years of mindfulness meditation (integrative body-mind training, IBMT) or physical exercise (PE) experience to demonstrate their effects on brain, physiology and behavior. Healthy older adults were randomly selected from a large community health project and the groups were compared on measures of quality of life, autonomic activity (heart rate, heart rate variability, skin conductance response, respiratory amplitude/rate), immune function (secretory Immunoglobulin A, sIgA), stress hormone (cortisol) and brain imaging (resting state functional connectivity, structural differences). In comparison with PE, we found significantly higher ratings for the IBMT group on dimensions of life quality. Parasympathetic activity indexed by skin conductance response and high-frequency heart rate variability also showed more favorable outcomes in the IBMT group. However, the PE group showed lower basal heart rate and greater chest respiratory amplitude. Basal sIgA level was significantly higher and cortisol concentration was lower in the IBMT group. Lastly, the IBMT group had stronger brain connectivity between the dorsal anterior cingulate cortex (dACC) and the striatum at resting state, as well as greater volume of gray matter in the striatum. Our results indicate that mindfulness meditation and physical exercise function in part by different mechanisms, with PE increasing physical fitness and IBMT inducing plasticity in the central nervous systems. These findings suggest combining physical and mental training may achieve better health and quality of life results for an aging population.

https://www.frontiersin.org/articles/10.3389/fpsyg.2020.00358/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1293822_69_Psycho_20200407_arts_A

 

Lower Opioid Cravings are Associated with Lower Depression, Higher Self-Regulation, and Higher Mindfulness

Lower Opioid Cravings are Associated with Lower Depression, Higher Self-Regulation, and Higher Mindfulness

 

By John M. de Castro, Ph.D.

 

mindfulness-based interventions could help people dependent on opioids increase their self-awareness and self-control over cravings and be less reactive to emotional and physical pain.” – Science Daily

 

Substance abuse and addiction is a terrible problem, especially opioid pain relievers. Opioid addiction has become epidemic and is rapidly increasing affecting more than 2 million Americans and an estimated 15 million people worldwide. In the U.S more than 20,000 deaths yearly were attributed to an overdose of prescription opioids, and another 13,000 deaths from heroin overdose. These statistics, although startling are only the tip of the iceberg. Drug use is associated with suicide, homicide, motor-vehicle injury, HIV infection, pneumonia, violence, mental illness, and hepatitis. It can render the individual ineffective at work, it tears apart families, it makes the individual dangerous both driving and not.

 

An effective treatment for addiction has been elusive. Most programs and therapies to treat addictions have poor success rates. Recent research is indicating that mindfulness has been found to be effective in treating addictions. One way that mindfulness may produce these benefits is by reducing cravings for opioids. It may also do so by affecting the ability of the addict to regulate their emotions. Indeed, mindfulness has been shown to improve emotional regulation.

 

In today’s Research News article “Autonomic and affective mediators of the relationship between mindfulness and opioid craving among chronic pain patients. Experimental and clinical psychopharmacology.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6355352/), Baker and Garland recruited non-cancer chronic pain patients who were taking opioid analgesics and had them complete self-report measures of mindfulness, opioid craving, and depression. They also measured their heart rates with an electrocardiogram (ECG) while looking at either neutral pictures or “opioid-related image (e.g., pills, pill bottles).” These data were analyzed to determine heart rate variability as a measure of the activity of the peripheral autonomic nervous system.

 

They found that the higher the levels of mindfulness the higher the levels of heart rate variability while looking at opioid-related pictures. And the lower the levels of depression and opioid cravings. Also, the higher the levels of depression, the higher the levels of opioid cravings. Employing a multivariate path analysis, they found that mindfulness was not associated with lower opioid cravings directly, but indirectly via mindfulness’ associations with heart rate variability and depression. That is, they found that mindfulness was associated with higher heart rate variability which was in turn associated with lower opioid cravings and also with lower depression which was in turn associated with lower opioid cravings.

 

Heart rate variability is thought to measure the nervous systems adjustments to the physiology involved in regulating its physical responses to stimuli. In other words, it’s a measure of self-regulation. The present results suggest that mindfulness is associated with greater self-regulation and this is associated with lower cravings for opioids. The results also suggest that depression is associated with higher cravings for opioids and that mindfulness interrupts this by being associated with lower depression.

 

These results are correlative and as such causation cannot be determined. Nevertheless, prior research has demonstrated causal links between mindfulness and lower cravings and depression. So, the present results likely result from causal connections. The findings also suggest the mechanism whereby mindfulness may lower cravings by contributing to the ability to regulate physical responses to opioid-related stimuli and by reducing depression. These results provide more support for the use of mindfulness training as a treatment for addictions.

 

So, lower opioid cravings are associated with lower depression, higher self-regulation, and higher mindfulness.

 

people suffering from opioid addiction and chronic pain may have fewer cravings and less pain when adding mindfulness to the traditional methadone treatment.” – Grace Bullock

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Baker, A. K., & Garland, E. L. (2019). Autonomic and affective mediators of the relationship between mindfulness and opioid craving among chronic pain patients. Experimental and clinical psychopharmacology, 27(1), 55–63. https://doi.org/10.1037/pha0000225

 

Abstract

Prescription opioid misuse among chronic pain patients is associated with self-regulatory deficits, affective distress and opioid cue reactivity. Dispositional mindfulness has been associated with enhanced self-regulation, lower distress, and adaptive autonomic responses following drug cue exposure. We hypothesized that dispositional mindfulness might serve as a protective factor among opioid-treated chronic pain patients. We examined heart rate variability (HRV) during exposure to opioid cues and depressed mood as mediators of the association between dispositional mindfulness and opioid craving. Data were obtained from a sample of chronic pain patients (N=115) receiving long-term opioid pharmacotherapy. Participants self-reported opioid craving and depression, and HRV was measured during an opioid-cue dot probe task. Dispositional mindfulness was significantly positively correlated with HRV, and HRV was significantly inversely associated with opioid craving. Dispositional mindfulness was significantly negatively correlated with depression, and depression was significantly positively correlated with opioid craving. Path analysis revealed significant indirect effects of dispositional mindfulness on craving through both HRV and depression. Dispositional mindfulness may buffer against opioid craving among chronic pain patients prescribed opioids; this buffering effect may be a function of improved autonomic and affective responses.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6355352/

 

Improve Autonomic Nervous System Function with Yogic Breathing

Improve Autonomic Nervous System Function with Yogic Breathing

 

By John M. de Castro, Ph.D.

 

The Bhramari pranayama breathing practice . . . .. is beneficial and instantly calming down the mind. It is one of the best breathing exercises to free the mind of distress, anxiety, or frustration and get rid of anger to a great level.” – Alpesh Jain

 

Breathing is essential for life and generally occurs automatically. It’s easy to take for granted as it’s been there our entire lives. Nevertheless, we become more aware of it when it varies with circumstances, such as when we exercise and also in emotional states, especially fear and anxiety. But we rarely notice it during everyday ongoing life. Yet, its characteristics are associated with our state of well-being. Slow deep breathing is characteristic of a healthy relaxed state. Breathing exercises are common in yoga practices and have been found to have a number of beneficial effects. Bhramari pranayama (Bee breathing) is a yogic breathing practice that adopts simple regulation of voluntary breathing involving an exhalation that simulates the typical humming sound of a bee.

 

Adolescence is a time of mental, physical, social, and emotional growth. It is during this time that higher levels of thinking, sometimes called executive function, develops. But adolescence can be a difficult time, fraught with challenges. During this time the child transitions to young adulthood; including the development of intellectual, psychological, physical, and social abilities and characteristics. There are so many changes occurring during this time that the child can feel overwhelmed and unable to cope with all that is required. It is not known whether training in Bhramari pranayama can be beneficial for adolescents.

 

In today’s Research News article “Effects of yoga breathing practice on heart rate variability in healthy adolescents: a randomized controlled trial.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6997567/), Kuppusamy and colleagues recruited healthy adolescents, 13-18 years of age, and randomly assigned them to either Bhramari pranayama (Bee breathing) or no treatment. Yogic breathing was practiced in the morning for 30 minutes, 5 days per week for 6 months. The participants electrocardiogram (ECG) was measured at rest before and after training.

 

With the ECG they found that in comparison to baseline and the no-treatment control participants, the adolescents who practiced yogic breathing had significantly lower heart rates and significantly higher time and frequency domains of heart rate variability. Increased heart rate variability indicates greater activity of the parasympathetic division of the autonomic nervous system that is active during relaxation. Hence, the findings suggest that practicing yogic breathing improves autonomic function.

 

Increased heart rate variability is associated with lower stress and greater health and longevity and psychological well-being. Hence, increased heart rate variability in the adolescents who practiced Bhramari pranayama (Bee breathing) is an indicator of improved autonomic function that underlies greater health and well-being. This suggests that practicing yogic breathing would improve the youth’s ability to develop healthily during the turbulent times of the teen years.

 

So, improve autonomic nervous system function with yogic breathing.

 

The noise of bhramari’s buzzing can drown out the endless mental tape loops that can fuel emotional suffering, making it a useful starting point for those whose minds are too “busy” to meditate.” – Timothy McCall

 

CMCS – Center for Mindfulness and Contemplative Studies

 

This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts and on Twitter @MindfulResearch

 

Study Summary

 

Kuppusamy, M., Kamaldeen, D., Pitani, R., Amaldas, J., Ramasamy, P., Shanmugam, P., & Vijayakumar, V. (2020). Effects of yoga breathing practice on heart rate variability in healthy adolescents: a randomized controlled trial. Integrative medicine research, 9(1), 28–32. https://doi.org/10.1016/j.imr.2020.01.006

 

Abstract

Background

This study was conducted among healthy adolescents to assess the effects of a yoga breathing practice (Bhramari pranayama, Bhr.P) towards cardiac autonomic function using heart rate variability (HRV) parameters.

Methods

Of the 730 eligible subjects screened, 520 healthy adolescents who met the inclusion and exclusion criteria were randomly assigned to either yoga breathing group (n = 260) or control group (n = 260). The yoga breathing group practiced Bhr.P. five days a week for a duration of six months while the control group continued with their daily routine without any intervention. Outcome measures were time and frequency domain of HRV in both groups which were assessed before and after the intervention using Lead II ECG. Linear models were used in the analysis of short term HRV.

Results

After 6 months of yoga breathing, the time domain parameters of short term HRV showed significant (P < 0.05) improvement towards the parasympathetic domain. Frequency domain parameters also showed the same direction of changes. In contrast, control group subjects showed a trend towards a sympathetic domain.

Conclusion

The present study showed a positive shift in cardiac autonomic modulation towards parasympathetic predominance after 6 months of yoga breathing practice among apparently healthy adolescents.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6997567/