School of Sport Sciences, UiT The Arctic University of Norway, Tromsø, Norway.
School of Exercise and Nutrition Sciences, Queensland University of Technology, Brisbane, Australia.
Eur J Sport Sci. 2023 Aug;23(8):1731-1740. doi: 10.1080/17461391.2022.2124386. Epub 2022 Oct 10.
This randomized cross-over study tested the hypothesis that heat acclimation training would detrimentally affect sleep variables and alter incidental physical activity compared to a thermoneutral training control condition. Eight recreationally trained males (V̇O 49±4.9 mLkgmin) completed two separate interventions separated by at least 31 days: 5 consecutive day training blocks of moderate-intensity cycling (60 min·day at 50% peak power output) in a hot (34.9±0.7 °C and 53±4 % relative humidity) and a temperate (22.2±2.6 °C; 65±8 % relative humidity) environment. Wrist-mounted accelerometers were worn continuously for the length of the training blocks and recorded physical activity, sleep quality and quantity. Data were analysed in a Bayesian framework, with the results presented as the posterior probability that a coefficient was greater or less than zero. Compared to the temperate training environment, heat acclimation impaired sleep efficiency (Pr <0 = .979) and wake on sleep onset (Pr >0 = .917). Daily sedentary time was, on average, 35 min longer (Pr >0 = .973) and light physical activity time 18 min shorter (Pr >0 = .960) during the heat acclimation period. No differences were observed between conditions in sleep duration, subjective sleep quality, or moderate or vigorous physical activity. These findings may suggest that athletes and coaches need to be cognisant that heat acclimation training may alter sleep quality and increase sedentary behaviour.Five consecutive days of heat training negatively affected some objective measures of sleep quality and incidental physical activity in recreationally trained athletes.Athletes and coaches need to be aware of the potential unintended consequences of using heat acclimation on sleep behaviours.
这项随机交叉研究检验了一个假设，即热适应训练会对睡眠变量产生不利影响，并改变与热中性训练对照条件相比的偶然身体活动。8 名有休闲训练经验的男性（V̇O 49±4.9 mLkgmin）完成了两个单独的干预，间隔至少 31 天：连续 5 天进行中等强度的自行车训练（50%最大功率输出，每次 60 分钟），在炎热（34.9±0.7°C 和 53±4%相对湿度）和温和（22.2±2.6°C；65±8%相对湿度）环境中进行。腕戴式加速度计在整个训练块期间连续佩戴，并记录身体活动、睡眠质量和数量。数据以贝叶斯框架进行分析，结果表示系数大于或小于零的后验概率。与温和训练环境相比，热适应会降低睡眠效率（Pr <0 = 0.979）和睡眠起始时的清醒度（Pr >0 = 0.917）。在热适应期间，平均每天久坐时间延长 35 分钟（Pr >0 = 0.973），轻度体力活动时间缩短 18 分钟（Pr >0 = 0.960）。在两种条件下，睡眠持续时间、主观睡眠质量或中等到剧烈体力活动均无差异。这些发现可能表明，运动员和教练需要意识到热适应训练可能会改变睡眠质量并增加久坐行为。连续 5 天的热训练对休闲运动员的一些客观睡眠质量和偶然身体活动测量值产生了负面影响。运动员和教练需要意识到使用热适应对睡眠行为可能产生的意外后果。
