Yoga

Improve the Symptoms of Lymphangioleiomyomatosis, a Rare Lung Disease, with Yoga

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Improve the Symptoms of Lymphangioleiomyomatosis, a Rare Lung Disease, with Yoga

 

By John M. de Castro, Ph.D.

 

“The daily practice of yoga can help in strengthening the muscles of the chest, increase lung capacity and boost oxygen intake.” – Ayurvalley

 

Lymphangioleiomyomatosis (LAM) is a very rare lung disease “caused by the abnormal growth of smooth muscle cells, especially in the lungs and lymphatic system. This abnormal growth leads to the formation of holes or cysts in the lung.” (Cleveland Clinic). It is a progressive disease that has symptoms similar to asthma and bronchitis. It is most prevalent in women during the prime of their lives, ages 20 to 40 years. There are no cures for LAM and treatment usually involves drugs that slow the disease progression.

 

Yoga has been shown to improve exercise tolerance and overall health and includes breathing exercises. Indeed, it has been shown that yoga practice improves the mental and physical health of patients with Chronic Obstructive Pulmonary Disease (COPD). So, it may be appropriate for patients with Lymphangioleiomyomatosis (LAM). Hence, there is a need for research into the effectiveness of yoga practice for LAM.

 

In today’s Research News article “Effects of yoga on exercise capacity in patients with lymphangioleiomyomatosis: a nonrandomized controlled study.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7075042/) Li and colleagues adult patients with lymphangioleiomyomatosis (LAM) who have stable disease and assigned them to either no-treatment or to receive Hatha yoga training for 90 minutes once a week for 24 weeks along with twice a week for 15 minutes home practice. They were measured before and after training for walking and afterward dyspnea, VO2peak and anaerobic threshold during an exercise test, lung function, activity, quality of life, anxiety and depression.

 

They found excellent participation and compliance with 92% attendance at the yoga training sessions and a median at how practice of 75 minutes per week. They found that in comparison to baseline and the no-treatment control group that the patients who received yoga training there was a significant large improvement in walking, and cardiopulmonary anerobic threshold, and peak workload.

 

These excellent results have to be tempered by the fact that the yoga and control groups were not randomly assigned. Rather patients within a city were compared to patients outside the city. But, as pilot results, they support a development of a large randomized control trial. The results suggest that yoga practice significantly improves motor function and cardiopulmonary function in patients with lymphangioleiomyomatosis (LAM). This would represent a significant improvement in the patients’ health.

 

So, improve the symptoms of lymphangioleiomyomatosis, a rare lung disease, with yoga.

 

“the beneficial effects of yoga on exercise capacity and pulmonary function were the most robust.” – Brandon May

 

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

 

Li, X., Xu, W., Zhang, L., Zu, Y., Li, Y., Yang, Y., Xiang, Y., Xiang, Y., Chen, L., Liu, W., Chen, L., & Xu, K. F. (2020). Effects of yoga on exercise capacity in patients with lymphangioleiomyomatosis: a nonrandomized controlled study. Orphanet journal of rare diseases, 15(1), 72. https://doi.org/10.1186/s13023-020-1344-6

 

Abstract

Objective

To evaluate the effects of yoga on exercise capacity and quality of life in patients with lymphangioleiomyomatosis (LAM), a rare cystic lung disease in women.

Patients and methods

This was a nonrandomized, controlled study conducted in Beijing, China (August 27, 2017 – April 26, 2018). Twenty-six participants were allocated to the intervention (yoga) group (n = 13) or control group (n = 13). The yoga intervention involved a 24-week program of yoga class training for 90 min once a week and no fewer than 2 at-home sessions per week (at least 15 min per session). The 6-min walking distance (6MWD), lung function, serum vascular endothelial growth factor-D (VEGF-D) levels, quality of life, and symptoms of anxiety and depression were measured at baseline, 12-week and 24-week follow-up. An incremental cardiopulmonary exercise test was conducted at baseline and the 24-week follow-up.

Results

Eleven patients completed the yoga training program. The yoga group exhibited improvements in the following outcomes versus those of the control group: 6MWD (+ 55 ± 29 m vs + 18 ± 49 m, P = 0.04), anaerobic threshold (3.4 ± 2.4 ml/min/kg vs 1.6 ± 1.4 ml/min/kg, P = 0.035) and peak work load (11.7 ± 14.6 W vs 0.2 ± 9.1 W, P = 0.027). There was no significant difference in peak oxygen consumption (VO2peak), lung function, VEGF-D level, and quality of life between the yoga and control groups. No adverse effects were found in the yoga group.

Conclusion

Yoga is a feasible and safe intervention for pulmonary rehabilitation and potentially improves exercise capacity in patients with LAM.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7075042/

 

Yoga Improves Spirituality and Psychological Health Regardless of Instruction

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Yoga Improves Spirituality and Psychological Health Regardless of Instruction

 

By John M. de Castro, Ph.D.

 

“While in the Western world most people recognize the more physical practices of yoga – particularly the poses, or asana – it is a practice that’s about much more than just our physical bodies. In Sanskrit language, the word “yoga” literally means “union.” – Katie M.

 

Yoga developed in India millennia ago as a deep spiritual practice. It developed as a contemplative practice that unified body and mind. Yoga was known to have physical benefits, but the most important benefit was seen to be spiritual development. But as yoga emerged and was practiced in the west it was secularized. This was for good reason, as western society was not ready to accept an ancient eastern spiritual practice. As a result, to the vast majority of westerners, yoga is an exercise for physical fitness. It is a means to mold the body to look good, as a health promoting practice, and as a strategy to help lose weight.

 

One important factor for the development of spirituality might be the way that practitioners are instructed. If the yoga instruction is focused on spiritual development then it is possible that the spiritual focus elicited would tend to facilitate spiritual growth. On the other hand, if the instruction is focused on physical development, then spiritual development may be lessened.

Placebo and participant expectancy effects are well known to produce profound effects on the individual. So, instruction may be essential to whether physical or spiritual growth develops from yoga practice. This idea has not been well explored.

 

In today’s Research News article “Verbal Cuing Is Not the Path to Enlightenment. Psychological Effects of a 10-Session Hatha Yoga Practice.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7351526/) Csala and colleagues recruited female yoga naïve undergraduate students and randomly assigned them to receive either 10 weekly 1.5 hour yoga sessions with instructions focusing either on the spiritual aspects of yoga or on the physical benefits of yoga or to a no-treatment control condition. They were measured before and after training for mindfulness, body awareness, positive and negative emotions, and spiritual connections.

 

They found that there were no significant differences between the two yoga groups so they were merged for comparison to the control condition. The yoga groups in comparison to baseline and the control condition had significant increases in spiritual connections and decreases in negative emotions. Hence, practicing yoga by novice college females increased their spirituality and improved their emotional state.

 

 

These results are surprising in that the same increase in spirituality occurred in the yoga groups regardless of whether the spiritual aspects or the physical aspects of yoga were emphasized in the instructions provided. This suggests that yoga has spiritual benefits regardless of the instructions given. Not surprisingly, as observed in previous studies, yoga practice improves the practitioners emotional state. College is a difficult and stressful time and very negative emotions can be elicited interfering with the students’ adjustments to college and performance. The results suggest that yoga practice may be helpful.

 

So, yoga improves spirituality and psychological health regardless of instruction.

 

“many people think of yoga as just physical exercises — the asanas or postures that have gained widespread popularity in recent decades — but these are actually only the most superficial aspects of this profound science of unfolding the infinite potential of the human mind and soul.” – Yogananda

 

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

 

Csala, B., Ferentzi, E., Tihanyi, B. T., Drew, R., & Köteles, F. (2020). Verbal Cuing Is Not the Path to Enlightenment. Psychological Effects of a 10-Session Hatha Yoga Practice. Frontiers in psychology, 11, 1375. https://doi.org/10.3389/fpsyg.2020.01375

 

Abstract

Verbal instructions provided during yoga classes can differ substantially. Yoga instructors might choose to focus on the physical aspects of yoga (e.g., by emphasizing the characteristics of the poses), or they might take a more spiritual approach (e.g., by mentioning energy flow and chakras). The present study investigated the effects of verbal cues during yoga practice on various psychological measures. Eighty-four female students (22.0 ± 3.80 years) participated in the study. Two groups attended a beginner level hatha yoga course in which physically identical exercise was accompanied by different verbal cues. The so-called “Sport group” (N = 27) received instructions referring primarily to the physical aspects of yoga practice, while the “Spiritual group” (N = 23) was additionally provided with philosophical and spiritual information. A control group (N = 34) did not receive any intervention. Mindfulness, body awareness, spirituality, and affect were assessed 1 week before and after the training. 2 × 3 mixed (time × intervention) ANOVAs did not show an interaction effect for any of the variables. However, when the two yoga groups were merged and compared to the control group, we found that spirituality increased, and negative affect decreased among yoga participants. In conclusion, yoga practice might influence psychological functioning through its physical components, independent of the style of verbal instructions provided.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7351526/

 

Activate the Brain and Synchronize the Cerebral Hemispheres with Kriya Yoga

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Activate the Brain and Synchronize the Cerebral Hemispheres with Kriya Yoga

 

By John M. de Castro, Ph.D.

 

“Kriya yoga in Sanskrit means “to move.” The yoga combines all the energy in the body of the mind and to increase the concentration and the awareness in the body. It helps in energizing all the parts of your body. The internal organs inside your body thyroid, spleen, liver, and pancreas, are energized which improve your overall health.” – Larissa Smith

 

Mindfulness training has been shown to improve health and well-being. It has also been found to be effective for a large array of medical and psychiatric conditions, either stand-alone or in combination with more traditional therapies. There are a wide variety of different mindfulness training techniques. Sudarshan Kriya Yoga (SKY) is an ancient technique that involves cyclical breathing patterns that range from slow and calming to rapid and stimulating. How exactly SKY produces its benefits is unknown.

 

One way to observe the effects of mindfulness practices is to measure changes in the electroencephalogram (EEG), the rhythmic electrical activity that can be recorded from the scalp. The recorded activity can be separated into frequency bands. Delta activity consists of oscillations in the 0.5-3 cycles per second band. Theta activity in the EEG consists of oscillations in the 4-8 cycles per second band. Alpha activity consists of oscillations in the 8-12 cycles per second band. Beta activity consists of oscillations in the 13-30 cycles per second band while Gamma activity occurs in the 30-100 cycles per second band.

 

In today’s Research News article “High-Frequency Cerebral Activation and Interhemispheric Synchronization Following Sudarshan Kriya Yoga as Global Brain Rhythms: The State Effects.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7336945/) Bhaskar and colleagues recruited adult Sudarshan Kriya Yoga practitioners. They recorded the electroencephalogram (EEG) for 5 minutes before and after a 1-hour Sudarshan Kriya Yoga practice.

 

They found that after Sudarshan Kriya Yoga (SKY) practice there was a significant increase in the spectral power of all EEG frequency bands. They also found that after SKY there was a significant increase in the synchronization of the electrical activity in the rwo cerebral hemispheres. These results indicate that a single session of SKY increases overall brain activity and interhemispheric synchronization.

 

These findings suggest that Sudarshan Kriya Yoga (SKY) practice heightens neural activity in a synchronized fashion. This suggests that SKY practice improves physiological balance, alertness, and mental well-being. It remains for future research to determine whether these changes in brain activity occur in SKY naive participants and whether these changes are lasting or only occurring in the immediate aftermath of SKY practice.

 

So, activate the brain and synchronize the cerebral hemispheres with Kriya Yoga.

 

“Kriya Yoga is universal in its benefits: it doesn’t depend on anything outside itself.” — Paramhansa Yogananda

 

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

 

Bhaskar, L., Tripathi, V., Kharya, C., Kotabagi, V., Bhatia, M., & Kochupillai, V. (2020). High-Frequency Cerebral Activation and Interhemispheric Synchronization Following Sudarshan Kriya Yoga as Global Brain Rhythms: The State Effects. International journal of yoga, 13(2), 130–136. https://doi.org/10.4103/ijoy.IJOY_25_19

 

Abstract

Context:

Respiration is known to modulate neuronal oscillations in the brain and is measured by electroencephalogram (EEG). Sudarshan Kriya Yoga (SKY) is a popular breathing process and is established for its significant effects on the various aspects of physiology and psychology.

Aims:

This study aimed to observe neuronal oscillations in multifrequency bands and interhemispheric synchronization following SKY.

Settings and Design:

This study employed before- and after-study design.

Subjects and Methods:

Forty healthy volunteers (average age 25.45 ± 5.75, 23 males and 17 females) participated in the study. Nineteen-channel EEG was recorded and analyzed for 5 min each: before and after SKY. Spectral power for delta, theta, alpha, beta, and gamma frequency band was calculated using Multi-taper Fast Fourier Transform (Chronux toolbox). The Asymmetry Index was calculated by subtracting the natural log of powers of left (L) hemisphere from the right® to show interhemispheric synchronization.

Statistical Analysis:

Paired t-test was used for statistical analysis.

Results:

Spectral power increased significantly in all frequency bands bilaterally in frontal, central, parietal, temporal, and occipital regions of the brain after long SKY. Electrical activity shifted from lower to higher frequency range with a significant rise in the gamma and beta powers following SKY. Asymmetry Index values tended toward 0 following SKY.

Conclusions:

A single session of SKY generates global brain rhythm dominantly with high-frequency cerebral activation and initiates appropriate interhemispheric synchronization in brain rhythms as state effects. This suggests that SKY leads to better attention, memory, and emotional and autonomic control along with enhanced cognitive functions, which finally improves physical and mental well-being.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7336945/

 

Yoga Changes the Brain to Improve Body Awareness, Attention, and Present Moment Awareness

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Yoga Changes the Brain to Improve Body Awareness, Attention, and Present Moment Awareness

 

By John M. de Castro, Ph.D.

 

“Similar to the effects of meditation, yoga is a neurological vacation – but it also awakens parts of the brain that are typically inactive during normal day-to-day activity. . . The mind becomes deeply intertwined with the body and the two become one – opening up the flow of communication.” – Morgan Garza

 

The practice of yoga has many benefits for the individual’s physical and psychological health. Yoga has diverse effects because it is itself diverse having components of exercise, mindfulness meditation, and spirituality. So, yoga nourishes the body, mind, and spirit. As a result, yoga practice would be expected to produce physical changes. These include the relaxation response and stress relief. These should be obvious in the muscles, tendons and joints, but, less obvious in the nervous system. The nervous system changes in response to how it is used and how it is stimulated in a process called neuroplasticity. Highly used areas grow in size and connectivity. Mindfulness practices in general are known to produce these kinds of changes in the structure, connectivity, and activity of the brain. Indeed, yoga practice has been shown to protect the brain from age related degeneration.

 

The research on yoga effects on the nervous system is accumulating. It makes sense to pause and look at what has been learned. In today’s Research News article “What Has Neuroimaging Taught Us on the Neurobiology of Yoga? A Review.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362763/) van Aalst and colleagues review and summarize 34 published research studies of the effects of yoga practice on the brain. The studies mainly included healthy adults.

 

They report that the published research studies used a wide variety of different yoga practices and as a result there were differences in the reported changes to the brain. Regardless, there were a number of similarities in the changes. They report that yoga practice increased the volume of brain areas especially the insular cortex and the hippocampus. Studies of activation of the brain have demonstrated that yoga produces increased activation of prefrontal cortical areas. Finally, studies of connectivity of brain areas have demonstrated that yoga practice increases functional connectivity in a series of brain areas that are known as the default mode network.

 

Yoga is known to increase body awareness. So, it is no surprise that the insular cortex is expanded by yoga practice. It has been shown to be involved in interoceptive body awareness. Yoga is also known to increase attentional ability. So, it is no surprise that the prefrontal cortical areas have increased activation with yoga practice. They have been shown to be involved in attention processing. Yoga is known to increase present moment awareness and decrease mind wandering. So, it is no surprise that yoga produces increased functional connectivity among the structures of the dorsal mode network. They have been shown to be involved in mind wandering and a lack of present moment awareness.

 

So, although differences in yoga practices produce differences in observed changes in the brain, there appear to consistent similarities. Yoga practice changes the brain in areas underlying body awareness, attention, and present moment awareness. It can be speculated that these changes in the brain underlie many of the physical and psychological benefits of yoga practice.

 

So, yoga changes the brain to improve body awareness, attention, and present moment awareness.

 

“We can talk about anxiety, depression and blood pressure lowering in yoga, all of those are proven. But the biggest thing we see that results from yoga is that your quality of life will change for the better,” – Amy Wheeler

 

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 Aalst, J., Ceccarini, J., Demyttenaere, K., Sunaert, S., & Van Laere, K. (2020). What Has Neuroimaging Taught Us on the Neurobiology of Yoga? A Review. Frontiers in integrative neuroscience, 14, 34. https://doi.org/10.3389/fnint.2020.00034

 

Abstract

Yoga is becoming increasingly popular worldwide, with several implicated physical and mental benefits. Here we provide a comprehensive and critical review of the research generated from the existing neuroimaging literature in studies of yoga practitioners. We reviewed 34 international peer-reviewed neuroimaging studies of yoga using magnetic resonance imaging (MRI), positron emission tomography (PET), or single-photon emission computed tomography (SPECT): 11 morphological and 26 functional studies, including three studies that were classified as both morphological and functional. Consistent findings include increased gray matter volume in the insula and hippocampus, increased activation of prefrontal cortical regions, and functional connectivity changes mainly within the default mode network. There is quite some variability in the neuroimaging findings that partially reflects different yoga styles and approaches, as well as sample size limitations. Direct comparator groups such as physical activity are scarcely used so far. Finally, hypotheses on the underlying neurobiology derived from the imaging findings are discussed in the light of the potential beneficial effects of yoga.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362763/

 

Reduce Occupational Stress in School Principals with Yoga

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Reduce Occupational Stress in School Principals with Yoga

 

By John M. de Castro, Ph.D.

 

“yoga is a good practice in the workplace as a means of reducing stress,” said Stacy Hunter

 

Stress is epidemic in the western workplace with almost two thirds of workers reporting high levels of stress at work. This often produces burnout; fatigue, cynicism, emotional exhaustion, and professional inefficacy. In a school setting, this exhaustion not only affects teachers and administrators personally, but also the students and schools, as it produces a loss of enthusiasm, empathy, and compassion. School principals are in a particularly stressful position dealing not only with teachers, staff, and students, but also with parents, school boards, and system administrators.

 

Hence, there is a need to identify methods of reducing stress and improving school principal psychological health. Mindfulness has been demonstrated to be helpful in reducing the psychological and physiological responses to stress and for treating and preventing burnout in a number of work environments. Yoga practice has the extra benefits of not only being mindfulness training but also as an exercise. Hence, it’s important to study the effects of yoga practice on the psychological health and burnout symptoms of school principals.

 

In today’s Research News article “Impact of residential yoga training on occupational stress and health promotion in principals.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7161695/) Verma and colleagues recruited veteran school principals with at least 15 years of experience and provided them with 7 days of yoga practice for 1 hour and 45 minutes twice daily along with 3 hours of daily lectures on stress management, yoga for total health, meditation, yoga in school education, and scientific basis of yoga and pranayama. They were measured before and after the week’s training for occupational stress, including role overload, role ambiguity, role conflict, unreasonable group and political pressure, responsibility for persons, under participation, powerlessness, poor peer relations, intrinsic impoverishment, law status, strenuous working condition, and unprofitability.

 

They found that in comparison to baseline, after yoga training there were significant improvements in occupational stress, including role overload, role ambiguity, role conflict, under participation, powerlessness, intrinsic impoverishment, and law status. But the study should be considered as a pilot study as there was no control group. The before-after research design is subject to a large number of alternative confounding interpretations including demand characteristics, participant expectation effects, attention effects, experimenter bias, etc. So, the positive findings of a significant reduction in occupational stress after the training should be seen as suggesting that is reasonable to conduct a randomized controlled trial.

 

So, reduce occupational stress in school principals with yoga.

 

“If you find yourself feeling cranky, wound up, or lethargic during the workday, get your body moving! See if you can take a break for some “office yoga,” especially beneficial if your job keeps you seated for most of the day.” – Nishita Morris

 

CMCS – Center for Mindfulness and Contemplative Studies

 

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

 

Study Summary

 

Verma, A., Shete, S. U., & Doddoli, G. (2020). Impact of residential yoga training on occupational stress and health promotion in principals. Journal of education and health promotion, 9, 30. https://doi.org/10.4103/jehp.jehp_394_19

 

Abstract

BACKGROUND:

Occupational stress is known as harmful physical and emotional responses that occur when the requirements of the job do not match the resources, needs, or capabilities of an employee, leading to poor mental and physical health.

OBJECTIVE:

The objective of the present study was to assess the effect of 1-week residential yoga training program on occupational stress and its subscales among principals.

METHODS:

Thirty-three principals with ages 40–59 years completed the assessment. They received yoga training at Kaivalyadham Yoga Institute. All the participants were recruited by Kendriya Vidyalaya Sangathan as part of their on-duty yoga training. At the baseline and after 1 week of yoga training participants were assessed for occupational stress. The yoga intervention was given in the morning and evening for 105 min. Apart from yoga training, all the participants were engaged in lectures based on stress management, yoga for total health, meditation, yoga in school education, and scientific basis of yoga, daily for 3 h.

RESULTS:

The principals showed a significant decrease in role overload (P < 0.001), role ambiguity (P < 0.01), role conflict (P < 0.05), under participation (P < 0.001), powerlessness (P < 0.001), intrinsic impoverishment (P < 0.01), law status (P < 0.001), and overall occupational stress (P < 0.001) after 7 days of yoga training intervention. However, there was no significant change in unreasonable group and political pressure (P > 0.05), responsibility for persons (P > 0.05), poor peer relations (P > 0.05), strenuous working conditions (P > 0.05), and unprofitability (P > 0.05) after yoga training intervention.

CONCLUSION:

The present study suggests that 1 week of residential yoga training program can improve occupational stress in principals.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7161695/

 

Normalize Heart Rate Processes with Yoga Practice

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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/

 

Yoga Practice Improves Mood and Spirituality Regardless of Physical or Spiritual Instruction

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Yoga Practice Improves Mood and Spirituality Regardless of Physical or Spiritual Instruction

 

By John M. de Castro, Ph.D.

 

“The word yoga means to join or unite, and yogis view this unison in different ways – the unison of body, mind and spirit, uniting all the aspects of yourself, or uniting with a higher power or spiritual force.” – DoYou

 

Yoga developed in India millennia ago as a deep spiritual practice. It developed as a contemplative practice that unified body and mind. Yoga was known to have physical benefits, but the most important benefit was seen to be spiritual development. But as yoga emerged and was practiced in the west it was secularized. This was for good reason, as western society was not ready to accept an ancient eastern spiritual practice.

 

There are many forms of yoga and many practitioners who are focused on the spiritual aspects of yoga. But, to the vast majority of westerner’s yoga is an exercise for physical fitness. It is a means to mold the body to look good, as a health promoting practice, and as a strategy to help lose weight. These are good and reasonable goals. But they have replaced the spiritual development originally promoted by yoga. As Jon Kabat-Zinn has remarked, ‘there is the potential for something priceless to be lost.’

 

It may be speculated that the instructions provided with yoga training may produce different effects on the physical and spiritual benefits. In today’s Research News article “Verbal Cuing Is Not the Path to Enlightenment. Psychological Effects of a 10-Session Hatha Yoga Practice.” (See summary below or view the full text of the study at: https://www.frontiersin.org/articles/10.3389/fpsyg.2020.01375/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1373328_69_Psycho_20200709_arts_A) Csala and colleagues recruited female college students with no previous experience with yoga and randomly assigned them to receive 10 weekly 1.5 hour training sessions in Hatha yoga designated either as “Sport” yoga or “Spiritual” yoga or to a no treatment control condition. The “Sport” yoga and “Spiritual” yoga  only differed in instructions. The “Sport” yoga group was instructed with an emphasis on the physical aspects of yoga (e.g., correct position, muscles involved). The “Spiritual” yoga group was instructed with an emphasis on the spiritual aspects of yoga (e.g. energetic body and blockages, chakras, meditations etc.). They were measured before and after training for body awareness, mindfulness, positive and negative emotions, and spiritual connections.

 

They found that in comparison to baseline and the no-treatment control condition the practice of either “Sport” or “Spiritual” yoga produced significant increases in spiritual connections and significant decreases in negative emotions. Hence, regardless of whether the instructions emphasized the physical or spiritual aspects of yoga practice, the same effects occurred of increased spirituality and mood.

 

Yoga practice has been repeatedly shown in prior research studies to improve mood. So, the observed mood enhancement effects were no surprise. But, the ability of yoga practice to increase spirituality even when the spiritual aspects of yoga were not talked about is surprising. Regardless of instruction Hatha yoga practice produced increased spirituality. This suggests that the western emphasis on the secular aspects of yoga may not interfere with the enhancement of spirituality produced by yoga practice.

 

Perhaps yoga practice makes the individual more aware of the physical limitations of the body and that by itself may put human existence into perspective, amplifying the importance of the non-physical, spiritual, aspects. Yoga practice has for centuries been practiced in the east enhancing spirituality. It is interesting to find that it has the same effects in the west even when there is no instruction on the spiritual side of yoga practice.

 

So, yoga practice improves mood and spirituality regardless of physical or spiritual instruction.

 

“yoga offers much more than just a way to exercise the body. The deeper meaning and gift of yoga is the path it offers into the timeless world of spirit.” – Chopra.com

 

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

 

Csala B, Ferentzi E, Tihanyi BT, Drew R and Köteles F (2020) Verbal Cuing Is Not the Path to Enlightenment. Psychological Effects of a 10-Session Hatha Yoga Practice. Front. Psychol. 11:1375. doi: 10.3389/fpsyg.2020.01375

 

Verbal instructions provided during yoga classes can differ substantially. Yoga instructors might choose to focus on the physical aspects of yoga (e.g., by emphasizing the characteristics of the poses), or they might take a more spiritual approach (e.g., by mentioning energy flow and chakras). The present study investigated the effects of verbal cues during yoga practice on various psychological measures. Eighty-four female students (22.0 ± 3.80 years) participated in the study. Two groups attended a beginner level hatha yoga course in which physically identical exercise was accompanied by different verbal cues. The so-called “Sport group” (N = 27) received instructions referring primarily to the physical aspects of yoga practice, while the “Spiritual group” (N = 23) was additionally provided with philosophical and spiritual information. A control group (N = 34) did not receive any intervention. Mindfulness, body awareness, spirituality, and affect were assessed 1 week before and after the training. 2 × 3 mixed (time × intervention) ANOVAs did not show an interaction effect for any of the variables. However, when the two yoga groups were merged and compared to the control group, we found that spirituality increased, and negative affect decreased among yoga participants. In conclusion, yoga practice might influence psychological functioning through its physical components, independent of the style of verbal instructions provided.

https://www.frontiersin.org/articles/10.3389/fpsyg.2020.01375/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1373328_69_Psycho_20200709_arts_A

 

Reduce Depression After Stillbirth with Yoga

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Reduce Depression After Stillbirth with Yoga

 

By John M. de Castro, Ph.D.

 

“Bereaved mothers with stillbirth (death at >20 weeks of gestation) have more than a 6-fold higher risk for Post Traumatic Stress Disorder (PTSD) compared to mothers after live birth. . . . Non-pharmacological approaches, such as yoga, may be an alternative option for bereaved women with stillbirth.” – Jennifer Huberty

 

Experiencing trauma is quite common. It has been estimated that 60% of men and 50% of women will experience a significant traumatic event during their lifetime with 7%-8% of the population developing Post-Traumatic Stress Disorder (PTSD). It involves a number of troubling symptoms including reliving the event with the same fear and horror in nightmares or with a flashback.

 

Having a stillbirth is a traumatic event for young women. It inevitably produces profound depression, grief, and symptoms of PTSD. Obviously, this is a troubling problem that needs to be addressed. There are a number of therapies that have been developed to treat depression, grief and  PTSD. One of which, mindfulness training has been found to be particularly effective for depression, PTSD symptoms, and grief.  Yoga practice has also been found to reduce depression and PTSD symptoms. There is, however, no studies to date on the effectiveness of yoga practice to help alleviate the trauma produced by stillbirth.

 

In today’s Research News article “Online yoga to reduce post traumatic stress in women who have experienced stillbirth: a randomized control feasibility trial.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7275350/) Huberty and colleagues recruited women who had experienced stillbirth within the last 2 years and randomly assigned them to receive 12 weeks of either low dose Hatha yoga (60 minutes per week), moderate dose Hatha yoga (150 minutes per week), or stretching and toning practice (60 minutes per week). All practice was led by online videos. They were measured before and after training and 8 weeks later for acceptability and demand for the program, PTSD symptoms, anxiety, depression, grief, self-compassion, emotion regulation, mindfulness, and sleep quality.

 

They found that PTSD symptoms decreased significantly over the measurement period with a 43% and 56% decrease for the low and moderate yoga groups and a 22% decrease for the stretching and toning group. But there were no significant differences between groups. On the other hand, in comparison to the stretching and toning group, both of the yoga groups had significant decreases in depression and grief. Unfortunately, the low dose yoga group only practiced on the average for 44 minutes per week and the high dose yoga only practiced for 77 minutes per week. This was well below the desired amount of practice.

 

The lack of a significant difference between the yoga and control groups was disappointing. Previous research has demonstrated that yoga practice reduces PTSD symptoms. It is possible that attempting to teach yoga remotely, online, to participants who are depressed simply may not be an effective way to encourage practice. Depressed patients lack motivation and it is possible that they need the encouragement of a group and an instructor to motivate their participation. Future research should employ traditional in person yoga classes for the treatment of women who had stillbirths.

 

Nevertheless, the yoga practice, even though it was below the dose desired, did significantly reduce depression. This corroborates previous findings that yoga practice is effective in treating a variety of forms of depression and suggests that it is also effective in treating depression emanating from stillbirth. Perhaps in person yoga classes may potentiate the effects on PTSD and other symptoms in women who had stillbirths.

 

So, reduce depression after stillbirth with yoga.

 

“a trauma-focused hatha yoga program may be a helpful adjunctive treatment for chronic PTSD.” – Sarah Krill Williston

 

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

 

Huberty, J., Sullivan, M., Green, J., Kurka, J., Leiferman, J., Gold, K., & Cacciatore, J. (2020). Online yoga to reduce post traumatic stress in women who have experienced stillbirth: a randomized control feasibility trial. BMC complementary medicine and therapies, 20(1), 173. https://doi.org/10.1186/s12906-020-02926-3

 

Abstract

Background

About 1 in every 150 pregnancies end in stillbirth. Consequences include symptoms of post traumatic stress disorder (PTSD), depression, and anxiety. Yoga has been used to treat PTSD in other populations and may improve health outcomes for stillbirth mothers. The purpose of this study was to determine: (a) feasibility of a 12-week home-based, online yoga intervention with varying doses; (b) acceptability of a “stretch and tone” control group; and (c) preliminary efficacy of the intervention on reducing symptoms of PTSD, anxiety, depression, perinatal grief, self-compassion, emotional regulation, mindfulness, sleep quality, and subjective health.

Methods

Participants (N = 90) were recruited nationally and randomized into one of three groups for yoga or exercise (low dose (LD), 60 min per week; moderate dose (MD), 150 min per week; and stretch-and-tone control group (STC)). Baseline and post-intervention surveys measured main outcomes (listed above). Frequency analyses were used to determine feasibility. Repeated measures ANCOVA were used to determine preliminary efficacy. Multiple regression analyses were used to determine a dose-response relationship between minutes of yoga and each outcome variable.

Results

Over half of participants completed the intervention (n = 48/90). Benchmarks (≥70% reported > 75% satisfaction) were met in each group for satisfaction and enjoyment. Participants meeting benchmarks (completing > 90% of prescribed minutes 9/12 weeks) for LD and MD groups were 44% (n = 8/18) and 6% (n = 1/16), respectively. LD and MD groups averaged 44.0 and 77.3 min per week of yoga, respectively. The MD group reported that 150 prescribed minutes per week of yoga was too much. There were significant decreases in PTSD and depression, and improvements in self-rated health at post-intervention for both intervention groups. There was a significant difference in depression scores (p = .036) and grief intensity (p = .009) between the MD and STC groups. PTSD showed non-significant decreases of 43% and 56% at post-intervention in LD and MD groups, respectively (22% decrease in control).

Conclusions

This was the first study to determine the feasibility and preliminary efficacy of an online yoga intervention for women after stillbirth. Future research warrants a randomized controlled trial.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7275350/

 

Increase Resting Metabolic Rate in Obese Women with Yoga

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Increase Resting Metabolic Rate in Obese Women with Yoga

 

By John M. de Castro, Ph.D.

 

“You get to thinking that yoga and its health benefits, such as stress reduction and improved fitness, are best for thin people, and not so much for the 36 percent of U.S. adults who are obese. Not true. Yoga is for all types of shapes and sizes.” – Laura McMullen

 

Obesity has become an epidemic in the industrialized world. In the U.S. the incidence of obesity, defined as a Body Mass Index (BMI) of 30 or above has more than doubled over the last 35 years to currently around 35% of the population, while two thirds of the population are considered overweight or obese (BMI > 25). Obesity has been found to shorten life expectancy by eight years and extreme obesity by 14 years. This occurs because obesity is associated with cardiovascular problems such as coronary heart disease and hypertension, stroke, metabolic syndrome, diabetes, cancer, arthritis, and others.

 

Obviously, there is a need for effective treatments to obese individuals. But, despite copious research and a myriad of dietary and exercise programs, there still is no safe and effective treatment. Mindfulness is known to be associated with lower risk for obesity, alter eating behavior and improve health in obesity. This suggests that mindfulness training may be an effective treatment for overeating and obesity alone or in combination with other therapies. Yoga may be particularly beneficial for the obese as it is both a mindfulness practice and an exercise. Yoga practice has been shown to have a myriad of physical and psychological benefits. These include significant loss of body weight and improvement in health in the obese.

 

In today’s Research News article “Comparing between the effect of energy-restricted diet and yoga on the resting metabolic rate, anthropometric indices, and serum adipokine levels in overweight and obese staff women.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7306236/) Yazdanparast and colleagues recruited healthy adulty overweight and obese women and randomly assigned them to receive 8 weeks of either a balanced restricted diet with a reduction in about 500 Kcal per day or to 5 days per week in class and home weekend practice of 1 hour Hatha yoga practice (estimated to expend 200 Kcal per day) in combination with a balanced restricted diet with a reduction in about 300 Kcal per day. They were measured before and after the 8-week practice period for resting metabolic rate, body size, blood lipids, blood glucose, leptin, and blood adiponectin.

 

They found that after the 8-week intervention both groups had significant reductions in body size and blood leptin levels but the yoga plus diet group also had significant increases in the resting metabolic rate and blood adiponectin levels while the diet alone group did not. On the other hand, the diet only group had a significant reduction in blood high density lipoprotein – cholesterol that did not occur in the yoga plus diet group.

 

These results are particularly interesting because the two groups were estimated to have the same deficit in caloric intake plus expenditure with the diet only group having a 500 Kcal per day reduction in intake while the yoga plus diet group had a 300 Kcal per day reduction in intake along with a 200 KCAL per day increase in expenditure. Hence the differences in the results for the two groups were not due to differences in total energy reduction.

 

This suggests that yoga practice has the extra benefit over diet alone of increasing the resting metabolic rate and blood adiponectin levels. Adiponectin is an anti-inflammatory protein that is secreted by fat cells but is decreased with obesity. The reduction in the yoga group suggests that the yoga practice may produce a reduction in inflammation in the women. Indeed, such a reduction in the inflammatory response produced by yoga practice has been documented previously. A reduction in inflammation is greatly beneficial to the overall health of the women.

 

The reduction in the resting metabolic rate represents the baseline caloric expenditure independent of activity. Hence, its reduction in the yoga group suggests that yoga practice increases energy expenditure all day long regardless of activity, increasing overall expenditure. This should, over time, produce an increased weight reduction. Indeed, the current study and  previous research has found the yoga practice reduces body size.

 

So, Increase Resting Metabolic Rate in Obese Women with Yoga.

 

“The benefits of practice are endless. As a light form of aerobic exercise, yoga can help to alleviate common symptoms of being affected by obesity.” – Laurel Dierking

 

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

 

Yazdanparast, F., Jafarirad, S., Borazjani, F., Haghighizadeh, M. H., & Jahanshahi, A. (2020). Comparing between the effect of energy-restricted diet and yoga on the resting metabolic rate, anthropometric indices, and serum adipokine levels in overweight and obese staff women. Journal of research in medical sciences : the official journal of Isfahan University of Medical Sciences, 25, 37. https://doi.org/10.4103/jrms.JRMS_787_19

 

Abstract

Background:

Weight management is an important strategy to prevent the consequences of obesity. The aim of the study was to compare the effect of yoga practice and energy-restricted diet on resting metabolic rate (RMR), anthropometric indices, and serum adiponectin and leptin in overweight and obese women.

Materials and Methods:

Obese or overweight women were divided into two groups: yoga practicing and energy-restricted diet. Exercise trials consisted of 60-min Hatha yoga equal to 200 kilocalories (kcal) combined with 300 kcal restriction per day, and an energy-restricted diet consisted of 500 kcal restriction per day. The intervention period for both the groups was 8 weeks. RMR, anthropometric indices, and serum adiponectin, leptin, and lipid profiles were measured at baseline and at the end of the study.

Results:

RMR was increased in yoga but not in the diet group (P = 0.001). The level of adiponectin was increased in the yoga group compared with the diet (P = 0.035). The concentration of high-density lipoprotein-cholesterol was decreased in the diet group significantly but not in yoga (P = 0.006). The level of leptin was decreased in both the groups (P = 0.001), and there were no significant differences between the two groups.

Conclusion:

The findings of the study demonstrated the effect of yoga practicing on RMR, and serum adiponectin, in overweight and obese women. It seems yoga practice with less energy restriction compared with a common energy restriction diet and is more effective in weight management for those who are in weight loss programs.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7306236/

 

Altered Brain Metabolism is Associated with Long-Term Yoga Practice

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Altered Brain Metabolism is Associated with Long-Term Yoga Practice

 

By John M. de Castro, Ph.D.

 

“the benefits of yoga are more encompassing than just the physical. And, thanks to modern technology and functional MRI scans, we’re now able to see how regular practice affects your brain.” – Emmy Lymn

 

The practice of yoga has many benefits for the individual’s physical and psychological health. Yoga has diverse effects because it is itself diverse having components of exercise, mindfulness meditation, and spirituality. So, yoga nourishes the body, mind, and spirit. As a result, yoga practice would be expected to produce physical changes. These include the relaxation response and stress relief. These should be obvious in the muscles, tendons and joints, but, less obvious in the nervous system. The nervous system changes in response to how it is used and how it is stimulated in a process called neuroplasticity. Highly used areas grow in size, metabolism, and connectivity. Mindfulness practices in general are known to produce these kinds of changes in the structure and activity of the brain.

 

In today’s Research News article “Long-term Ashtanga yoga practice decreases medial temporal and brainstem glucose metabolism in relation to years of experience.” (See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7225240/), Aalst and colleagues recruited experienced adult yoga practitioners (at least 2 years of 3 times per week practice) and non-practitioners matched for age, gender, education, and physical activity levels. They had the experienced yoga practitioners perform 75 minutes of yoga while the control group practiced 75 minutes of aerobic exercise. Before and after they underwent a Positron Emission Tomography (PET) brain scan to determine changes in glucose metabolism (metabolic activity) in various brain regions.

 

They found that the experienced yoga practitioners at rest had significantly lower levels of activity in the hippocampus, parahippocampus, amygdala, insula, anterior midbrain, striatum (globus pallidus), and cerebellum compared to non-practitioners. After yoga practice there was a significant increase in activity in the cerebellum that wasn’t present for the non-practitioners after aerobic exercise. No significant differences in grey matter volume was observed.

 

The findings that the activity (brain metabolism) in the yoga practitioners while at rest is altered suggests that these are relatively permanent neuroplastic changes in the brain produced by long-term yoga practice. These changes are in areas that are known to be involved in mood and emotion regulation (limbic system, hippocampus, parahippocampus, amygdala), motor movements (cerebellum and striatum), and interoception and body awareness (Insula). These results are in line with the established ability of yoga practice to improve mood and emotion regulation, interoception and body awareness, and movement.

 

The findings are correlational and as such causation cannot be determined. But prior research has established that yoga training produces similar improvements in well-being and changes in the brain suggesting that these effects are caused by yoga practice. Yoga practice is a complex set of activities including postures, meditation, breathing practice, spirituality, and relaxation. It will remain for future research to determine which of these components or which combinations are responsible for which effects.

 

Yoga practitioners have different levels of brain activity at rest reflecting the psychological changes observed in yoga practitioners. The psychological changes suggest that the better emotional and physical well-being in yoga practitioners is due to neuroplastic changes in the brain produced by long-term yoga practice. These results support the recommendation of practicing yoga to improve physical and psychological well-being.

 

So, altered brain metabolism is associated with long-term yoga practice.

 

“The practice of yoga helps improve emotional regulation to reduce stress, anxiety and depression and that seems to improve brain functioning.” – Neha Gothe

 

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 Aalst, J., Ceccarini, J., Schramm, G., Van Weehaeghe, D., Rezaei, A., Demyttenaere, K., Sunaert, S., & Van Laere, K. (2020). Long-term Ashtanga yoga practice decreases medial temporal and brainstem glucose metabolism in relation to years of experience. EJNMMI research, 10(1), 50. https://doi.org/10.1186/s13550-020-00636-y

 

Abstract

Background

Yoga is increasingly popular worldwide with several physical and mental benefits, but the underlying neurobiology remains unclear. Whereas many studies have focused on pure meditational aspects, the triad of yoga includes meditation, postures, and breathing. We conducted a cross-sectional study comparing experienced yoga practitioners to yoga-naive healthy subjects using a multiparametric 2 × 2 design with simultaneous positron emission tomography/magnetic resonance (PET/MR) imaging.

Methods

18F-FDG PET, morphometric and diffusion tensor imaging, resting state fMRI, and MR spectroscopy were acquired in 10 experienced (4.8 ± 2.3 years of regular yoga experience) yoga practitioners and 15 matched controls in rest and after a single practice (yoga practice and physical exercise, respectively).

Results

In rest, decreased regional glucose metabolism in the medial temporal cortex, striatum, and brainstem was observed in yoga practitioners compared to controls (p < 0.0001), with a significant inverse correlation of resting parahippocampal and brainstem metabolism with years of regular yoga practice (ρ < − 0.63, p < 0.05). A single yoga practice resulted in significant hypermetabolism in the cerebellum (p < 0.0001). None of the MR measures differed, both at rest and after intervention.

Conclusions

Experienced yoga practitioners show regional long-term decreases in glucose metabolism related to years of practice. To elucidate a potential causality, a prospective longitudinal study in yoga-naive individuals is warranted.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7225240/