|Year : 2015 | Volume
| Issue : 1 | Page : 12-17
Psycho-neuro-endocrine-immune mechanisms of action of yoga in type II diabetes
Vijay Pratap Singh1, Bidita Khandelwal2, Namgyal T Sherpa3
1 Department of Physiotherapy, Sikkim Manipal Institute of Medical Sciences, Gangtok, Sikkim, India
2 Department of Medicine, Sikkim Manipal Institute of Medical Sciences, Gangtok, Sikkim, India
3 Department of Medicine, STNM Hospital, Gangtok, Sikkim, India
|Date of Web Publication||18-Sep-2015|
Vijay Pratap Singh
Department of Physiotherapy, Sikkim Manipal Institute of Medical Sciences, 5th Mile, Tadong, Gangtok - 737 101, Sikkim
Source of Support: None, Conflict of Interest: None
Yoga has been found to benefit all the components of health viz. physical, mental, social and spiritual well being by incorporating a wide variety of practices. Pathophysiology of Type II DM and co-morbidities in Type II DM has been correlated with stress mechanisms. Stress suppresses body's immune system and neuro-humoral actions thereby aff ecting normal psychological state. It would not be wrong to state that correlation of diabetes with stress, anxiety and other psychological factors are bidirectional and lead to diffi culty in understanding the interrelated mechanisms. Type II DM cannot be understood in isolation with psychological factors such as stress, anxiety and depression, neuro-endocrine and immunological factors. There is no review which tries to understand these mechanisms exclusively. The present literature review aims to understand interrelated Psycho-Neuro-Endocrine and Immunological mechanisms of action of Yoga in Type II Diabetes Mellitus. Published literature concerning mechanisms of action of Yoga in Type II DM emphasizing psycho-neuro-endocrine or immunological relations was retrieved from Pubmed using key words yoga, Type II diabetes mellitus, psychological, neural, endocrine, immune and mechanism of action. Those studies which explained the psycho-neuroendocrine and immune mechanisms of action of yoga were included and rest were excluded. Although primary aim of this study is to explain these mechanisms in Type II DM, some studies in non-diabetic population which had a similar pathway of stress mechanism was included because many insightful studies were available in that area. Search was conducted using terms yoga OR yogic AND diabetes OR diabetic IN title OR abstract for English articles. Of the 89 articles, we excluded non-English articles (22), editorials (20) and letters to editor (10). 37 studies were considered for this review. The postulated mechanism of action of yoga is through parasympathetic activation and the associated anti stress mechanism. It reduces perceived stress and HPA axis activation thereby improving overall metabolic and psychological profiles, increasing insulin sensitivity, and improving glucose tolerance and lipid metabolism. Yoga has positive effects on immune system of diabetics.– Overall, Type II DM is influenced by psycho-neuro-endocrine and immune mechanisms where Yoga has important positive role in combating stressors and improving these systems to regain health.
Keywords: Yoga, Type II DM, psycho-neuro-endocrine, mechanisms of action, immune mechanisms, HIP-PNE model
|How to cite this article:|
Singh VP, Khandelwal B, Sherpa NT. Psycho-neuro-endocrine-immune mechanisms of action of yoga in type II diabetes. Ancient Sci Life 2015;35:12-7
| Introduction|| |
Yoga has been found to benefit all the components of health viz. physical, mental, social and spiritual well being by incorporating wide variety of practices. Yoga techniques include the practice of prāṇāyāma, which regulates respiration through variety of exercises, and āsana, which includes various physical exercises and postures in a highly coordinated manner integrated with systematic breathing. Although yoga is a discipline which is not just confined to āsana (postural exercises) or prāṇāyāma (breathing exercises), but most studies are based on exercise effect of yoga. This is so because āsana and prāṇāyāma can easily be taught and learned and thus incorporated in to life style. These exercises have been found to bring about positive biochemical and hormonal changes by eliminating stress and instilling a sense of discipline. Yoga is also easily accepted by the elderly because yogic exercises consist of slow, rhythmic movements which bring about adequate stretching of muscles and joints with appropriate strengthening in these structures as well as it stimulates glands such as pancreas to augment insulin secretion.
Abnormal increase in sympathetic activity and reduction in parasympathetic activity has been associated with Type II DM. Chronic stress; anxiety and depression have already been implicated in pathogenesis as well as the aftermath of diabetes. Some studies have shown positive effects of yoga intervention on stress and anxiety.
Studies and reviews have clearly shown the positive effects of Yoga on glycemic control, blood pressure, lipid profile, stress, anxiety, and depression but have not identified the mechanisms of action of Yoga in Type II DM. Previous studies have clearly stated the need to review mechanisms by which yoga helps in diabetes. This study reviews published literature to explain psycho-neuro-endocrine and immune mechanisms of action of Yoga in improving Type II DM.
| Materials and Methods|| |
Independent search was conducted by two researchers independently using search terms 'Yoga OR Pranayama AND diabetes OR diabetic IN title or abstract in National Library of Medicine- MEDLINE (www.pubmed.com) website. The retrieved citations and articles were appraised and mutual consensus was obtained in presence of the two more researchers. The included articles were then grouped qualitatively under effect of yoga explaining psychological, neural, endocrine and immune mechanisms of action.
Published literature concerning mechanisms of action of Yoga in Type II DM emphasizing psycho-neuro-endocrine or immunologic relations was retrieved from Pubmed and Pubmed Central and analyzed. Those studies which explained the psycho-neuro-endocrine and immune mechanisms of action of yoga were included and rest were excluded. Although primary aim of this study is to explain these mechanisms in Type II DM, studies in non-diabetic population which had a similar pathway of stress mechanism was included because they had parallel explanations in line with objective of our study. Aim of this study is not to quantify the benefits rather it was aimed to explain mechanisms of action (MOA) of yoga in Type II DM. therefore, studies which have not explained MOA of yoga were excluded. Further, there seems to be a common pathway of stress mechanisms and immune reactions especially concerning Hypothalamic- Pituitary- Adrenal (HPA) Axis, therefore some studies of non-diabetic population have been included to explain immunologic benefits of yoga extrapolating from cancer studies to postulate possible benefits in diabetic subjects.
| Results|| |
Key words used were psychologic, neurologic, endocrine, immune, mechanisms of action, Yoga and Type II Diabetes Mellitus. Total of 89 studies were retrieved by various combinations of key words, which was subjected to an expert panel of 4 faculties to include and exclude studies. Of the 89 articles, we excluded non-English articles (22), editorials (20) and letters to editor (10). 37 studies were taken in to account for this review.
| Discussion|| |
Studies on Yoga provide convincing evidence for its effectiveness over autonomic nervous system. Bagchi and Wenger reported that yogic meditation induces inner relaxation of ANS without inducing sleep as well as raising immune levels in the body without exaggerating physiological manifestation against external stimuli, thereby providing a balance between body and outside world.
Yoga has a direct effect on optimizing secretion of sympathetic hormones such as cortisol and catecholamine, thereby improving parasympathetic activity and reducing metabolic rate. Type II DM has been correlated with stress mechanisms. Stress suppresses body's immune system and neuro-humoral actions thereby affecting psychological state. It would not be wrong to state that correlation of diabetes with stress, anxiety and other psychological factors are bidirectional and make understanding the interrelated mechanisms difficult.,, In such a situation, yoga proves to be promising as it helps the body come back to balanced state of physical and emotional congruence. A previous study  has reported the influence of stress in disturbing neuro-endocrine and hypothalamus function that further affects immune modulation and immune homeostasis. Another study has reported incorporation of stress in Human Information Processing pattern (HIP).,
Kulkarni and Bera, 2009 reported HIP as a method of neuropsychology to understand role of cortex and stimulus information processing. HIP has been theorized to constitute five steps, namely, detection of stimulus, discrimination, decision, memory and reaction time. These steps succinctly explain processing of cognitive stimuli with meaningful motor output.
Its conjugation with stress can be understood as stress being the result of withdrawal of attention and reduced attention sensitivity thereby detrimental towards health. Since the limbic system is the seat of emotion, any stressful event diverts cortical aspects of attention process to affective response. This in turn negatively affects the HPA axis. Ultimately the immune system is also negatively affected. This pathophysiological phenomenon is represented in a schematic diagram [Figure 1].
|Figure 1: Schematic diagram showing pathophysiology of Stress and Stress related disorders due to abnormal HIP-PNE model. HIP-PNE: Human Information Processing - PsychoNeuroEndocrine information, HPA: Hypothalamo-Pituitary-Adrenal axis|
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Yoga acts via downregulating the HPA axis which gets hyperactivated as a response to abnormal physical or psychological demand (stressor). Any stressful situation affects balance between sympathetic and parasympathetic systems by release of increased cortisol and catecholamines. This response is classic 'fight or flight' response which is encountered by hypermobilization of energy needed to combat the stressor. This constant state of hyper vigilance resulting from repeated firing of HPA axis leads to dysregulation of normal body system leading to stress-related diseases such as diabetes, depression, obesity and cardio vascular diseases. Yoga attenuates the stress cascade by reducing the perception of stress. Yoga decreases physiological manifestations of stress by reducing heart rate, blood pressure and respiratory rate., A study by Smith et al. showed increased pain tolerance and lowered pain related brain activity during MRI in yoga practioners. Tooley et al. found significantly higher plasma melatonin levels in yoga meditators. Harinath et al. found increased melatonin, improved psychological and cardio respiratory profiles in yoga practioners after 3 months of practice.
Reduction of cardiovascular risk factors in diabetes is a hallmark of successful diabetes management.,, Yoga seems to be beneficial in doing this. Mechanism of action of Yoga can be hypothesized under two pathways:Firstly by way of vagal stimulation and secondly by parasympathetic activation and HPA axis modification. Thefirst postulated mechanism is through Yoga's action on vagal stimulation by improving baroreflex sensitivity, reducing inflammatory cytokines, and thereby reducing blood pressure and resting heart rate.,,,, Yoga practice also improves endothelial function and reduces risks of cardiovascular diseases in Type II DM.
Second postulated mechanism of action of yoga is through parasympathetic activation and associated anti stress mechanisms. It reduces perceived stress and HPA axis activation, thereby improving overall metabolic and psychological profiles, increasing insulin sensitivity, and improving glucose tolerance and lipid metabolism. These pathways are shown in [Figure 2].
|Figure 2: Postulated pathways of Yoga benefits in reducing Cardiovascular risk factors in pathogenesis of Type II DM through autonomic nervous system|
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Stress is a root cause of many diseases. [Figure 3] portrays the pathophysiological cascade of stress and disease. Through constant deregulation of HPA axis and the sympathetic nervous system, stress keeps the entire mechanism in chaos with dysregulation of hormones such as cortisol, catecholamines etc. Their increased stimulation over a period causes diseases such as Type II diabetes. Yoga acts in an opposite manner by bringing balance to both the autonomic nervous system and the HPA axis. It reduces secretions of cortisol, catecholamines, inflammatory cytokines, rennin and anti-inflammatory factors. A previous study has revealed preponderance of alpha waves in yogis recorded through EEG.
|Figure 3: Pathophysiologic mechanisms of stress and its impact on Hypothalamic-Pituitary-Adrenal axis(HPA). *Yoga seems to be promising in its anti stress mechanism and positive modulation of HPA axis|
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Physiology of neural plasticity is a significant discovery which has provided the basis for understanding rehabilitation science and the regaining of lost functions after neurologic insult. The ability of neural structures to repair their functions, reorganize structures through flexibility in neural structure, is known as neural plasticity. It mainly comprises of developmental, experience related and regeneration related components. Yoga asanas and yogic practices involve both motor movements and sensory experiences. Thus, it may be hypothesized that yogic practices utilize neural plasticity to bring about sustained changes in structure and function of the brain. Although neural connections and structures are more dependent on genetics and development, experience related neural plasticity seem to play a greater role in reshaping neural structures. These theoretical considerations may explain how pathophysiology of Type II DM and regeneration of beta cells in pancreas may be positively affected by Yoga.
Yoga practice is directly related to improved insulin sensitivity to glucose signals in Type II DM. It attenuates the negative relationship between factors causing insulin resistance such as obesity, increased waist circumference, dyslipidemia etc. Yoga also improves sensitivity of beta cells of pancreas to glucose signals. Manjunatha et al. have stated that there is reduction in brisk release of insulin when glucose level tends to fall whereas there is increased insulin release when glucose tends to rise in blood. This mechanism gets support from a previous study of Sahay who observed a fall in fasting insulin level when glucose level is at minimum level. Yoga optimizes insulin secretion as per bodily requirement through its neuro-endocrinal effects and thereby bringing about normalcy in the Insulin/Glucose ratio which is suggestive of better peripheral utilization of Insulin and reduced insulin resistance.
Possible benefits of yoga on immune system-emerging hypotheses
In response to stress, activation of Hypothalamo-Pituitary-adrenal Axis (HPA) results in secretion of Corticotrophin-Releasing Factor (CRF) from hypothalamus. CRF stimulates the secretion of ACTH from pituitary, which further activates the adrenal glands to produce glucocorticoids, which are powerful immune regulators. The effects of glucocorticoids on cellular and humoral immune responses are quite complex. Although the overall effect of glucocorticoids on immune responses at the cellular level is immunosuppressive, this effect may result from suppression of many stimulatory components of immune cascade and stimulation of some immunosuppressive or anti-inflammatory elements. The relatively greater sensitivity of components of cellular immunity to glucocorticoid suppression tends to shift immune response from a cellular to humoral pattern during stress.,
No well designed experimental study has been reported concerning the effects of yoga on diabetics' immune systems. However, studies have reported the efficacy of yoga in different populations, especially cancer patients. Findings of these studies can be extrapolated to diabetes and immunology because some of the pathways of its mechanism of action are similar. A study by Ronson reported allostatic load as a cause of dysregulation of immune system in cancer patients due to dysfunction of the HPA axis as a result of the stress of oncologic pathophysiology. Although that study concerned cancer patients, dysregulation of HPA axis has been reported by many authors as cause of co-morbidities in Diabetics.
There was decrease in natural killer cells in advanced breast cancer patients following yoga practice as reported by the present author which is a predictor of survival. Recent studies reported that Relaxation elicitation, particularly after long-term practice, may evoke health benefits by improving mitochondrial energy production and utilization and thus promoting mitochondrial resilience through upregulation of ATPase and insulin function. Mitochondrial resilience might also be promoted by relaxation induced downregulation of NF-κB-associated upstream and downstream targets that mitigates stress. NF-κB pathway genes are known to have a prominent role in inflammation, diabetes, stress, trauma and cancer – which were suppressed after relaxation response elicitation.,
In a study by SuQu et al., a yoga program had a rapid and significantly greater effect on gene expression in peripheral blood mononuclear cells (PBMCs) compared to the control group who were given only walking exercise with relaxing music. They suggested that gene expression alteration may be the basis for long term higher level health effects. Another study reported increase in cortisol level as a stress marker in examinees but this rise was less in the group of examinees who practiced yoga. Further, the yoga group showed attenuation of increase in cortisol due to examination stress which was attributed to relaxing effects of yoga on mind, in turn reducing stimulus to hypothalamus and anterior pituitary and thereby reducing secretion of cortisol. This study also reported mean plasma IL-4 rise and serum IFN-y decrease with examination stress. Decrease in serum IFN-y was significant in control group and non-significant in yoga group. Decrease in serum IFN-y is a marker of reduced cellular immunity. This study found yoga to exert a buffering effect on cellular immunity. It was conducted on a group of students with perceived examination-stress. However pathways of stress have been same as in diabetics and therefore, the finding is relevant to be discussed here.
Limitations and scope for future
This study has examined mechanisms for the action of yoga in Type II Diabetes, especially the integrative mechanisms of psycho-neuro-endocrine and immune relationships. These are interrelated and complex to be understood and therefore there is no definite verdict on these mechanisms. Many experimental studies which have reported these probable mechanisms were limited by several issues such as unclear methodology, interventions and program structure, quasi experimental, lack of control group, confounding variables and smaller sample sizes. Some studies have even presented few data or too many confounders which make them difficult to generalize. However, we have tried to discuss the mechanisms of action of yoga in terms of psycho-neuro-endocrine and immune mechanisms in Type II diabetes with scope for future research. We recommend well designed blinded randomized studies to evaluate effect of yoga on immune markers in diabetics to obtain valid results. We also recommend experimental studies which can evaluate effect of yoga on psycho-neuro-endocrine mechanisms to prove the theories laid down by various studies discussed here.
| Conclusion|| |
It is difficult to identify any single pathophysiologic mechanism of action of yoga in Type II DM as the risk factors and etiologies of Type II DM are multifactorial. Similarly it is difficult to postulate any single unidirectional pathway of Yoga action in Type II DM. Yoga's mechanisms of action in Type II DM are integrated and their effect is multisystemic. The psycho-neuro-endocrine and immune mechanisms of action of yoga in Type II DM represent a possible approach to understanding its holistic effects on disease modulation of Type II DM. This review suggests psycho-neuro-endocrine and immune mechanisms that may be important to understanding yoga's actions on Type II DM.
Summing up, the words Samatvam yoga ucyate (2:48; Bhagvad Gita): Equanimity is yoga. Samatvam is being able to maintain one's balance of mind in success and failure, gain and loss, pleasure and pain, and that is the aptitude of a perfect Yoga master who remains equipoised in all circumstances. Samatvam of the mind can contribute in preventing many illnesses. Yoga of equanimity has the potential to control negativity of brain and behavior by modulating its activity through psycho-neuro-endocrine and immune mechanisms to restore and maintain health in the true sense.
Dean, SMIMS, Gangtok and ICMR.
Financial support and sponsorship
Indian Council of Medical Research, ICMR.
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
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