Hunter Stacy D, Laosiripisan Jitanan, Elmenshawy Ahmed, Tanaka Hirofumi
Department of Health and Human Performance, Texas State University, San Marcos, TX, USA.
Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX, USA.
Exp Physiol. 2018 Mar 1;103(3):391-396. doi: 10.1113/EP086725. Epub 2018 Feb 4.
What is the central question of this study? Does the heated practice environment enhance the effects of Bikram yoga on endothelium-dependent vasodilatation in healthy, middle-aged adults? What is the main finding and its importance? The primary finding from this investigation is that the hatha yoga postures in the Bikram yoga series produce similar enhancements in endothelium-dependent vasodilatation in healthy, middle-aged adults regardless of environmental temperature. These findings highlight the efficacy of yoga postures in producing improvements in vascular health and downplay the necessity of the heated practice environment in inducing vascular adaptations.
We have previously documented improvements in endothelium-dependent vasodilatation with a Bikram (hot) yoga intervention in middle-aged adults. At present, the effect of environmental temperature in hot yoga on endothelial function is unknown. The purpose of this investigation was to determine the effects of Bikram yoga interventions performed in heated or thermoneutral conditions on endothelium-dependent vasodilatation. Fifty-two sedentary but apparently healthy adults aged 40-60 years were randomly assigned to one of three groups: Bikram yoga practised at 40.5°C (n = 19), Bikram yoga practised at 23°C (n = 14) or sedentary time control (n = 19). The yoga interventions consisted of 90 min Bikram yoga classes three times a week for 12 weeks. Endothelium-dependent vasodilatation was measured non-invasively using brachial artery flow-mediated dilatation (FMD). Body fat percentage determined via dual-energy X-ray absorptiometry was significantly lower in the hot yoga group after the intervention than in the thermoneutral yoga and control conditions. Brachial artery FMD increased (P < 0.05) in the thermoneutral yoga group and tended to increase in the hot yoga group (P = 0.056). No changes occurred in the control group. There were no significant differences in FMD change scores between groups. We conclude that Bikram yoga practised in thermoneutral conditions improved endothelium-dependent vasodilatation in healthy, middle-aged adults. These new findings highlight the effectiveness of hatha yoga postures alone, in the absence of a heated practice environment, in improving vascular health and are of clinical significance given the increased propensity for heat intolerance in ageing adults.
本研究的核心问题是什么？在健康的中年成年人中，热瑜伽练习环境是否会增强比克拉姆瑜伽对内皮依赖性血管舒张的影响？主要发现及其重要性是什么？本次调查的主要发现是，无论环境温度如何，比克拉姆瑜伽系列中的哈他瑜伽体式在健康的中年成年人中都会产生类似的内皮依赖性血管舒张增强效果。这些发现突出了瑜伽体式对改善血管健康的功效，并淡化了热瑜伽练习环境对诱导血管适应性的必要性。
我们之前记录了比克拉姆（热）瑜伽干预对中年成年人内皮依赖性血管舒张的改善作用。目前，热瑜伽中的环境温度对内皮功能的影响尚不清楚。本研究的目的是确定在热环境或中性温度环境下进行的比克拉姆瑜伽干预对内皮依赖性血管舒张的影响。52名年龄在40 - 60岁、久坐但看似健康的成年人被随机分为三组：一组在40.5°C下练习比克拉姆瑜伽（n = 19），一组在23°C下练习比克拉姆瑜伽（n = 14），另一组为久坐对照组（n = 19）。瑜伽干预包括每周三次、每次90分钟的比克拉姆瑜伽课程，持续12周。使用肱动脉血流介导的血管舒张（FMD）无创测量内皮依赖性血管舒张。干预后，热瑜伽组通过双能X线吸收法测定的体脂百分比显著低于中性温度瑜伽组和对照组。中性温度瑜伽组的肱动脉FMD增加（P < 0.05），热瑜伽组有增加趋势（P = 0.056）。对照组无变化。各组间FMD变化评分无显著差异。我们得出结论，在中性温度环境下练习比克拉姆瑜伽可改善健康中年成年人的内皮依赖性血管舒张。这些新发现突出了仅通过哈他瑜伽体式（在没有热瑜伽练习环境的情况下）改善血管健康的有效性，并且鉴于老年成年人对热不耐受的倾向增加，具有临床意义。
