A yoga intervention for type 2 diabetes risk reduction: a pilot randomized controlled trial

Abstract

Background: Type 2 diabetes is a major health problem in many countries including India. Yoga may be an effective type 2 diabetes prevention strategy in India, particularly given its cultural familiarity.

Methods: This was a parallel, randomized controlled pilot study to collect feasibility and preliminary efficacy data on yoga for diabetes risk factors among people at high risk of diabetes. Primary outcomes included: changes in BMI, waist circumference, fasting blood glucose, postprandial blood glucose, insulin, insulin resistance, blood pressure, and cholesterol. We also looked at measures of psychological well-being including changes in depression, anxiety, positive and negative affect and perceived stress. Forty-one participants with elevated fasting blood glucose in Bangalore, India were randomized to either yoga (n = 21) or a walking control (n = 20). Participants were asked to either attend yoga classes or complete monitored walking 3-6 days per week for eight weeks. Randomization and allocation was performed using computer-generated random numbers and group assignments delivered in sealed, opaque envelopes generated by off-site study staff. Data were analyzed based on intention to treat.

Results: This study was feasible in terms of recruitment, retention and adherence. In addition, yoga participants had significantly greater reductions in weight, waist circumference and BMI versus control (weight -0.8 ± 2.1 vs. 1.4 ± 3.6, p = 0.02; waist circumference -4.2 ± 4.8 vs. 0.7 ± 4.2, p < 0.01; BMI -0.2 ± 0.8 vs. 0.6 ± 1.6, p = 0.05). There were no between group differences in fasting blood glucose, postprandial blood glucose, insulin resistance or any other factors related to diabetes risk or psychological well-being. There were significant reductions in systolic and diastolic blood pressure, total cholesterol, anxiety, depression, negative affect and perceived stress in both the yoga intervention and walking control over the course of the study.

Conclusion: Among Indians with elevated fasting blood glucose, we found that participation in an 8-week yoga intervention was feasible and resulted in greater weight loss and reduction in waist circumference when compared to a walking control. Yoga offers a promising lifestyle intervention for decreasing weight-related type 2 diabetes risk factors and potentially increasing psychological well-being.

Trial registration: ClinicalTrials.gov Identified NCT00090506.

Figure 1

Flow diagram of study enrollment.

Figure 2

Pre/post changes in fasting blood glucose.

Figure 3

Pre/post changes in postprandial blood glucose.

Figure 4

Pre/post changes in body mass index.

Figure 5

Pre/post changes in weight.

Figure 6

Pre/post changes in waist circumference.

Figure 7

Pre/post changes in serum insulin.

Figure 8

Pre/post changes in insulin resistance.

Figure 9

Pre/post changes in systolic blood pressure.

Figure 10

Pre/post changes in diastolic blood pressure.

Figure 11

Pre/post changes in low-density lipoproteins.

Figure 12

Pre/post changes in total cholesterol.

Figure 13

Pre/post changes in triglycerides.