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   Table of Contents     
ORIGINAL ARTICLE  
Year : 2012  |  Volume : 5  |  Issue : 1  |  Page : 10-15
Effect of yoga therapy on reaction time, biochemical parameters and wellness score of peri and post-menopausal diabetic patients


1 Professor and Head, Department of Physiology and Program Director, ACYTER, JIPMER, Puducherry, India
2 Program Co ordinator, ACYTER, JIPMER, Puducherry, India
3 Yoga Instructor, ACYTER, JIPMER, Puducherry, India
4 Senior Research Fellow, ACYTER, JIPMER, Puducherry, India
5 Director, Morarji Desai National Institute of Yoga, New Delhi, India

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Date of Web Publication11-Jan-2012
 

   Abstract 

Background: Yogic practices may aid in the prevention and management of diabetes mellitus (DM) and reduce cardiovascular complications in the population. The present study has been undertaken to evaluate the effect of yoga therapy on reaction time, biochemical parameters and wellness score of peri and post-menopausal diabetic patients.
Materials and Methods: 15 peri and post-menopausal patients receiving standard medical treatment for type 2 DM were recruited and reaction time and biochemical investigations were done before and after a comprehensive yoga therapy program comprising of three times a week sessions for six weeks. A post-intervention, retrospective wellness questionnaire compiled by ACYTER was used to evaluate the comparative feelings of the patients after the therapy program.
Results: Yoga training reduced auditory reaction time (ART) from right as well as left hand, the decrease being statistically significant (P<0.05) for ART from the right hand. There was a significant (P<0.01) decrease in fasting and postprandial blood glucose levels as well as low density lipoprotein. The decrease in total cholesterol, triglycerides, and very low density lipoprotein and increase in high density lipoprotein was also statistically significant (P<0.05). All the lipid ratios showed desirable improvement with a decrease (P<0.01) of TC/HDL and LDL/HDL ratios and increase (P<0.05) in the HDL/LDL ratio.
Discussion : Shortening of RT implies an improvement in the information processing and reflexes and is the first such report in diabetic patients. This has clinical significance and is worth further exploration with wider, well controlled, randomized studies in the diabetic population. Changes in blood glucose levels may be due to improved insulin sensitivity, decline in insulin resistance and increased sensitivity of the pancreatic b cells to glucose signals. Yoga improved the 'heart friendly' status of lipid profile in our subjects and as our participants were peri and post-menopausal, the decrease in cardiovascular risk profile is of greater significance. A comprehensive yoga therapy program has the potential to enhance the beneficial effects of standard medical management of diabetes mellitus and can be used as an effective complementary or integrative therapy program.

Keywords: Diabetes mellitus; lipid profile; peri-menopausal; post-menopausal; reaction time; yoga therapy

How to cite this article:
Madanmohan, Bhavanani AB, Dayanidy G, Sanjay Z, Basavaraddi IV. Effect of yoga therapy on reaction time, biochemical parameters and wellness score of peri and post-menopausal diabetic patients. Int J Yoga 2012;5:10-5

How to cite this URL:
Madanmohan, Bhavanani AB, Dayanidy G, Sanjay Z, Basavaraddi IV. Effect of yoga therapy on reaction time, biochemical parameters and wellness score of peri and post-menopausal diabetic patients. Int J Yoga [serial online] 2012 [cited 2023 Mar 30];5:10-5. Available from: https://www.ijoy.org.in/text.asp?2012/5/1/10/91696

   Introduction Top


The role of yoga in promoting health and preventing and managing psychosomatic disorders has been established by numerous scientific studies. [1] Yogic techniques produce consistent physiological changes and have sound scientific basis. [2] Yogic lifestyle modification produces remarkable improvements and can make an appreciable contribution to primary prevention as well as management of lifestyle diseases. [3]

It is now recognized that diabetes mellitus (DM) is a lifestyle and psychosomatic disorder in which factors such as sedentary habits and physical, emotional and mental stress play a major role. Modern research has focused on psycho-physiological beneficial effects of yoga as it is more than a mere physical exercise. [4],[5],[6],[7],[8] It has been reported that even a short lifestyle modification and stress management education program based on yoga reduces risk factors for cardiovascular disease and DM within a period of 9 days [9] while a systematic review of 32 articles published between 1980 and 2007 found that yoga interventions are generally effective in reducing body weight, blood pressure, glucose level and high cholesterol. [10]

Yogic practices may have a role in prevention and management of diabetes and in co-morbid conditions like hypertension and dyslipidemia. [7] Long-term yoga practice is associated with increased insulin sensitivity and attenuation of negative relationship between body weight or waist circumference and insulin sensitivity. [11] With no appreciable side effects and multiple collateral benefits, yoga is safe, is simple to learn and can be practiced by even ill, elderly or disabled individuals. [4] Being safe, simple and economical therapy, it should be considered as a beneficial adjuvant for DM patients. [12]

A comprehensive review by Innes and Vincent [4] found beneficial changes in several risk indices, including glucose tolerance, insulin sensitivity, lipid profile, anthropometric characteristics, blood pressure, oxidative stress, coagulation profiles, sympathetic activation and pulmonary function, as well as improvement in specific clinical outcomes. They suggested that yoga may improve risk profiles in adults with non insulin dependent (NIDDM) and may have promise for the prevention and management of cardiovascular complications in this population.

Reduced ovarian function after menopause results in adverse changes in glucose and insulin metabolism with derangement of lipoprotein profile that is associated with increased risk of cardiovascular disease. [13] The present study has been undertaken to evaluate the effects of a comprehensive six week yoga therapy program on reaction time, biochemical parameters and wellness score in peri and post-menopausal female diabetic patients.


   Materials and Methods Top


The present study has been conducted as part of a larger study on the effects of yoga therapy on DM that had been accorded permission by the Research and Ethics Councils of the institute. 15 female patients aged 36 - 63 years (50.40 ± 2.47 SEM) receiving medical treatment for type 2 DM at JIPMER were recruited for this study by accidental sampling method and informed consent obtained from them. None of the patients had previously engaged in yoga practice. 11 of them were menopausal for more than a year and 4 were peri-menopausal. 4 of them had coexisting hypertension, 3 musculoskeletal disorders and 7 neurological disorders. Patients with history, signs and symptoms and/or laboratory reports suggestive of nephrologic and ophthalmologic complications were excluded from the study. The following parameters were tested before and after the six-week study period.

Reaction time

Reaction time (RT)apparatus (Anand Agencies, Pune) was used for the study. The instrument has a built-in 4 digit chronoscope with a display accuracy of 1 ms. It features four stimuli, two response keys and a ready signal. Switch for selecting right or left response key for any stimulus is provided. Recordings were taken in an air-conditioned laboratory 2 h after a light breakfast. To avoid the effect of lateralized stimulus, visual and auditory signals were given from the front of the subject who was instructed to use his right hand first and then left hand while responding to the signal. In the present study, auditory reaction time (ART) was recorded for auditory beep tone stimulus and visual reaction time (VRT) for red light stimulus. The subjects were instructed to release the response key as soon as they perceived the stimulus. The signals were given from the front of the subjects to avoid the effect of lateralized stimulus and they used their dominant hand while responding to the signal. [14],[15] All subjects were given adequate exposure to the equipment on two different occasions to familiarize them with the procedure of RT measurement. This was done because RT is more consistent when subjects have had adequate practice. [16] RT was obtained with an accuracy of 1 ms. More than ten trials were recorded and mean of three similar observations was taken as a single value for statistical analysis.

Biochemical investigations

Biochemical investigations were done at the Central Lab of the institute where blood was drawn from an antecubital vein in post-absorptive state. On the day of the blood collection, subjects were asked to abstain from yoga practice. Fasting blood glucose (FBG), 2-h postprandial blood glucose (PPBG) and lipid profile including total cholesterol (TC), triglyceride (TG), high density lipoprotein (HDL), low density lipoprotein (LDL) and very low density lipoprotein (VLDL) were requisitioned and evaluated before and after the study period.

Wellness questionnaire

A post-intervention, retrospective wellness questionnaire compiled by ACYTER was used to evaluate the comparative feelings of the patients after the therapy program. Five different responses ranging from 'worse than before' up to "complete relief/total satisfaction' were utilized to evaluate various physical and psychological aspects of the patient's condition. The questionnaire was finalized in consultation with a 12 member team consisting of 3 eminent medical practitioners, 2 psychologists, 2 yoga experts, 2 eminent yoga therapy consultants, 2 educationalists and one legal anthropologist.

Yoga therapy program

The patients had an initial consultation session at the ACYTER Yoga OPD and were given yogic counseling and lifestyle modification advice. They then attended the special sessions conducted at ACYTER for diabetes patients. A comprehensive yoga therapy program was imparted to the patients by qualified yoga instructors at ACYTER for the duration of 60 min thrice a week for six weeks. The schedule is given in [Table 1]. Patients were advised to practice without over straining depending on their individual capacity. There was 99.63% attendance during the 18 directly supervised sessions. Patients were also motivated to practice at home on other days. Of the 15 patients, 5 reported a home practice of 4 days/week, 4 a practice 3 days/week and 2 practiced 2 days/week at home. One patient each reported that they practiced 5, 6, and 7 days/week at home while one reported they didn't practice at home at all. Analysis of patient feedback showed that the duration of home practice was 30 min for 9 patients, 60 min for 3 patients and 40 min for 2 patients.
Table 1: Sequence and duration of yoga techniques practiced by our subjects

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Statistical analysis

Data was assessed for normality using GraphPad InStat and passed normality testing by Kolmogorov-Smirnov test. Statistical analysis was done using Students t (paired) test and P values less than 0.05 were accepted as indicating significant differences between pre and post-intervention data.


   Results Top


The results are given in [Table 2] and [Table 3].
Table 2: Effect of six weeks yoga therapy on visual reaction time (VRT) and auditory reaction time (ART) from right and left hands of type 2 diabetes mellitus patients before (B) and after (A) the study period

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Table 3: Effect of six weeks yoga therapy on fasting blood glucose (FBG), postprandial blood glucose (PPBG), total cholesterol (TC), triglycerides (TG), low density lipoprotein (LDL), very low density lipoprotein (VLDL) and high density lipoprotein (HDL) in patients of type 2 diabetes mellitus before (B) and after (A) the study period

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Reaction time

Yoga training decreased ART and VRT from both right and left hands. However, the decrease was statistically significant (P=0.0357) only for ART from the right hand (from 196.87 ± 9.25 to 178.04 ± 6.36 ms). The decrease in ART from left hand from 193.31 ± 6.19 to 179.44 ± 5.03 ms was appreciable (7.18%) but missed statistical significance (P=0.0583). The decrease in VRT from right as well as left hand was not statistically significant [Table 2].

Biochemical investigations

FBG decreased significantly (P=0.0035) by 20.62% from 160.07 ± 15.65 to 127.07 ± 10.24 mg/dl. PPBG also decreased significantly (P=0.0012) by 14.52% from 244.20 ± 17.12 to 208.73 ± 16.07 mg/dl. There was a statistically significant (P=0.016) decrease in TC from 161.24 ± 9.10 to 152.95 ± 7.17 mg/dl (5.14%). The 9.89% decrease in TG from 110.53 ± 10.56 to 99.60 ± 8.37 mg/dl was also significant (P=0.020) along with the 10.64% decrease in LDL from 96.53 ± 9.46 to 86.27 ± 7.78 mg/dl (P=0.0012) and a significant (P=0.022) 9.77% decrease in VLDL from 22.11 ± 2.11 to 19.95 ± 1.67 mg/dl. On the other hand, HDL increased significantly (P=0.022) from 42.60 ± 5.16 to 47.07 ± 5.08 mg/dl, an increase of 10.49%. There was a significant (P=0.003) decrease of 17.37% in TC/HDL ratio from 4.36 ± 0.46 to 3.60 ± 0.31, a significant (P=0.005) decrease of 22.41% in LDL/HDL ratio from 2.77 ± 0.40 to 2.15 ± 0.27. There was a significant (P=0.016) increase of 19.13% in the HDL/LDL ratio from 0.65 ± 0.21 to 0.77 ± 0.24.

Wellness questionnaire

The post-intervention overall wellness scores of the participants are given in [Figure 1] and the detailed breakup of % responses to each question is given in [Table 4]. The results of the total overall retrospective wellness scores indicated that 7% attained complete relief and total satisfaction after the therapy program while 27% were much better than before. 42% were better than before while 23% reported no change in their condition. The condition of 1% was worse than before.
Figure 1: Post-intervention overall % responses of the participants to the wellness questionnaire

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Table 4: Post-intervention % responses of the participants to retrospective wellness questionnaire

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   Discussion Top


In an earlier work, we have reported that diabetic patients have a longer RT as compared to normal subjects. [14] In the present work, we have demonstrated that a comprehensive six-week yoga therapy program produces a significant shortening in ART in diabetic patients. To the best of our knowledge, this is the first such report. Shortening of RT can be explained by increase in sensory-motor conduction velocity and/or faster information processing in the central nervous system. [17] This has physiological as well as clinical significance as faster RT means better performance of sports personnel, precision surgeons and other professionals. Here, it is interesting to note that we have previously reported an immediate shortening of RT following the practice of nine rounds of mukha bhastrika, a bellows type of yoga breathing. [18]

Fasting as well as post-prandial blood glucose levels decreased significantly in our subjects following the yoga therapy program. This is consistent with earlier studies that have reported that yoga training results in a reduction in both FBG and PPBG levels and better glycemic control. [8],[19] The 20.62% reduction in FBG in our subjects is comparable with the 6.1-34.4% reduction reported in a review of 25 studies on yoga and diabetes by Innes and Vincent. [4] Sahay [7] has reported an improvement in insulin sensitivity and decline in insulin resistance in subjects practicing yoga while Manjunatha et al., [20] reported that the performance of asanas leads to an increased sensitivity of the b cells of pancreas to glucose signals. It is possible that a similar mechanism is responsible for the improvements in blood sugar levels of our subjects. Increased sympathetic activity, enhanced cardiovascular reactivity and reduced parasympathetic tone have been strongly implicated in the pathogenesis of insulin resistance syndrome, atherosclerosis and cardiovascular diseases. Innes and Vincent [4] have suggested that yoga reduces this risk profile by decreasing activation of the sympatho-adrenal system and the hypothalamic-pituitary-adrenal axis and also by promoting a feeling of wellbeing along with direct enhancement of parasympathetic activity via vagus nerve. They also suggested that yoga provides a positive source of social support that is a factor associated with reduced risk for cardiovascular diseases. All these factors are applicable to our study and may explain the positive changes produced following the adherence to the comprehensive yoga therapy program.

The significant decreases in TC, TG, LDL and VLDL values coupled with significant increase in HDL in our participants imply an improved lipid profile having good prognostic value. This decrease of 'bad' cholesterol and a concomitant increase in 'good' cholesterol has significance when viewed in light of the cardiovascular risk profile of diabetic patients. [4] It has been previously reported that hatha yoga exercise and conventional PT exercise may have preventative and protective effects on DM by decreasing oxidative stress and improving antioxidant status. [21] A similar mechanism may be working in our patients as a systematic review also found the effects of yoga training to be more prominent with regard to fasting blood glucose level and lipid profile. [22] Innes and Vincent [4] reported that all 12 studies reviewed by them suggested that yoga improves lipid profile. Reductions in TC, TG, and LDL, VLDL and increase in HDL in our subjects are comparable with the findings of their review. Upon analysis of the different relative cholesterol ratios, it is apparent that the yoga therapy program improved the 'heart friendly' status of lipid profile in our subjects. Normally the 'safe' TC/HDL ratio should be less than 4. This was initially 4.36 ± 0.46 in our patients and after the six-week therapy program decreased by 17.37% to a safe level of 3.60 ± 0.31. A healthy LDL/HDL ratio should be less than 3. Though the initial pre-training level in our subjects was a higher normal value it also reduced by 22.41% to a lower normal value. HDL/LDL ratio should normally be more than 0.3 but it is preferable to maintain it above 0.4. This also increased by 19.13% to a higher normal value implying better prognosis of cardiovascular health.

Malhotra et al., [8] reported a significant decrease in waist-hip ratio and changes in insulin levels, suggesting a positive effect of yoga asanas on glucose utilization and fat redistribution in NIDDM. This is applicable in the present work as most of the practices used in both studies are the same or of similar nature. In light of the above findings, our study reiterates the conclusion made by Innes and Vincent that yoga may improve risk profiles in adults with NIDDM and has promise in preventing and managing cardiovascular complications in this population. [4]

The findings of an improved lipid profile status is especially important in our study as 11 of the participants were postmenopausal while the other 4 were pre and peri-menopausal. Loss of ovarian function after menopause results in adverse changes in glucose and insulin metabolism with derangement of lipid profile that is associated with increased risk of cardiovascular disease. [13] It has also been reported that heart disease increases 5 times in females who have DM and that the 'female advantage' over men with regard to coronary heart disease is lost after menopause. [23] Hence the positive changes in lipid profile in our peri-menopausal diabetic subjects have great significance.

It has been reported that a short lifestyle modification and stress management educational program leads to remarkable improvement in the subjective wellbeing scores and can therefore make an appreciable contribution to primary prevention as well as management of lifestyle diseases. [3] Majority of our patients reported an improvement in appetite, ability to concentrate, control anger, confidence levels, ease of breathing, energy level, enjoyment of life with calm and fresh feeling [Table 4] and [Figure 1]. They also reported a reduced feeling of hopelessness, nervousness and loneliness. They reported improvements in general flexibility and joint mobility along with better general mood, sense of relaxation and wellbeing. Menstrual cycles normalized in all four patients who were pre and peri-menopausal. There was a decrease in stress levels with improved quality and duration of sleep. This is similar to a recent report that yoga improves psychological outcomes in type 2 diabetes patients with improved well being and reduced anxiety. [24] Yoga may be improving mental and emotional components of the personality and subjective well being reported by our participants may be a contributing psycho-physiological factor in the desirable improvements shown by our patients. This aspect needs further exploration. Interestingly, one participant who didn't practice at home reported that there was an increase in her medication while the one who practiced every day at home, reported that her medication had reduced. Though both had reported improvements in the well being questionnaire, responses of the one who practiced every day were in the range of 'much better' to 'total relief' while responses of the other one were mainly in the 'same' to 'better' range.

The potential benefits being contributed by the different practices in our study may be hypothesized as follows. Surya namaskar improves metabolic function, helping in utilizing excess glucose while toning up the musculoskeletal system. Tadasan evokes a sense of stability and balance both physically and mentally while asanas such as parivritta trikonasan, padahastasan, ardha-kati-chakrasan, vakrasan, paschimottanasan, pavanamuktasan, bhujangasan and dhanurasan by their twisting and compression-relaxation actions may be stimulating intra-abdominal organs such as liver and pancreas thus producing benefits in the lipid profile. Ardha halasan and viparitakarani may be harmonizing psycho-neuro-endocrine function as seen in reaction time while chandranadi pranayam may be normalizing autonomic balance. Pranav pranayam, nadi shuddhi and savitri pranayam may contribute toward a sense of calmness that enhances inherent healing potentials while kayakriya and shavasan create a sense of mind-body harmony that corrects the psycho-somatic component of DM.

The main strength of present study is the excellent compliance and regularity of the yoga practice by the patients both during the directly supervised sessions (99.63% attendance) and at home, where all except one patient practiced regularly for an average of 4 days/week and 30-40 min per day. Hence the all-round benefits obtained can be attributed to the dedicated and regular practice of our comprehensive yoga therapy program. As the participants were peri and post-menopausal, the decrease in cardiovascular risk profile is of great significance.

The main drawback of our study is lack of a control group and the accidental sampling method used. As our participants were also receiving standard hospital medication, it is difficult to determine the relative effects of yoga and medical management. However, as there was no change in the medical management protocol that had already stabilized the clinical status of our patients, we can reasonably conclude that the additional benefits are due to the yoga therapy program. It is suggested that further randomized control studies should be done to confirm these findings and facilitate a deeper understanding of the mechanisms underlying such beneficial results.

In conclusion, our study shows that a comprehensive six-week yoga therapy training program produces significant improvement in reaction time, blood glucose and lipid profile of peri and post-menopausal diabetes patients. A comprehensive yoga therapy program has the potential to enhance the beneficial effects of standard medical management of DM and can be used in an effective complementary or integrative therapy program.


   Acknowledgements Top


The authors wish to thank the Department of AYUSH, Ministry of Health and Family Welfare, Government of India for establishing ACYTER as a collaborative venture between the MDNIY, New Delhi and JIPMER, Puducherry.

 
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Correspondence Address:
Ananda Balayogi Bhavanani
Program Co ordinator, ACYTER, JIPMER, Puducherry 605 006
India
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Source of Support: Department of AYUSH, Ministry of Health and Family Welfare, Government of India, Conflict of Interest: None


DOI: 10.4103/0973-6131.91696

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