Chaya M S, Nagendra H R
Int J Yoga. 2008 Jan;1(1):27-32. doi: 10.4103/0973-6131.36761.
The metabolic rate is an indicator of autonomic activity. Reduced sympathetic arousal probably resulting in hypometabolic states has been reported in several yogic studies.
The main objective of this study was to assess the effect of yoga training on diurnal metabolic rates in yoga practitioners at two different times of the day (at 6 a.m. and 9 p.m.).
Eighty eight healthy volunteers were selected and their metabolic rates assessed at 6 a.m. and 9 p.m. using an indirect calorimeter at a yoga school in Bangalore, India.
The results show that the average metabolic rate of the yoga group was 12% lower than that of the non-yoga group (P < 0.001) measured at 9 p.m. and 16% lower at 6 a.m. (P < 0.001). The 9 p.m. metabolic rates of the yoga group were almost equal to their predicted basal metabolic rates (BMRs) whereas the metabolic rate was significantly higher than the predicted BMR for the non-yoga group. The 6 a.m. metabolic rate was comparable to their predicted BMR in the non-yoga group whereas it was much lower in the yoga group (P < 0.001). The lower metabolic rates in the yoga group at 6 a.m. and 9 p.m. may be due to coping strategies for day-to-day stress, decreased sympathetic nervous system activity and probably, a stable autonomic nervous system response (to different stressors) achieved due to training in yoga.
代谢率是自主神经活动的一个指标。在一些瑜伽研究中，已报道交感神经兴奋降低可能导致代谢低下状态。
本研究的主要目的是评估瑜伽训练对瑜伽练习者在一天中两个不同时间点（上午6点和晚上9点）的昼夜代谢率的影响。
选取88名健康志愿者，在印度班加罗尔的一所瑜伽学校，于上午6点和晚上9点使用间接热量计评估他们的代谢率。
结果显示，瑜伽组的平均代谢率在晚上9点时比非瑜伽组低12%（P < 0.001），在上午6点时低16%（P < 0.001）。瑜伽组晚上9点的代谢率几乎等于其预测的基础代谢率（BMR），而非瑜伽组的代谢率显著高于预测的BMR。非瑜伽组上午6点的代谢率与其预测的BMR相当，而瑜伽组则低得多（P < 0.001）。瑜伽组在上午6点和晚上9点较低的代谢率可能归因于应对日常压力的策略、交感神经系统活动的降低，以及可能由于瑜伽训练实现的稳定的自主神经系统对不同应激源的反应。
