Extremes Research Group, College of Health and Behavioural Sciences, Bangor University, Gwynedd, Bangor, Wales LL57 2PZ, UK.
Eur J Appl Physiol. 2013 Sep;113(9):2353-60. doi: 10.1007/s00421-013-2671-2. Epub 2013 Jun 13.
Individuals exposed to total sleep deprivation may experience an increased risk of impaired thermoregulation and physiological strain during prolonged physical activity in the heat. However, little is known of the impact of more relevant partial sleep deprivation (PSD). This randomized counterbalanced study investigated the effect of PSD on thermal strain during an exercise-heat stress.
Ten healthy individuals performed two stress tests (45 min running, 70 % [Formula: see text] 33 °C, 40 % RH). Each trial followed three nights of controlled sleep: normal [479 (SD 2) min sleep night(-1); Norm] and PSD [116 (SD 4) min sleep night(-1)]. Energy balance and hydration state were controlled throughout the trials. Rectal temperatures (T re), mean skin temperature ([Formula: see text]), heart rate (HR), RPE, and thermal sensations (TS) were measured at regular intervals during each heat stress trial.
There was a significant main effect of time (P < 0.05) for all of these variables. However, no differences (P > 0.05) were observed between PSD and Norm, respectively, for T re [39.0 (0.5) vs. 39.1 (0.5) °C], [Formula: see text], [36.1 (0.6) vs. 36.0 (0.7) °C] and HR [181 (13) vs. 182 (13) beats min(-1))] at the end of exercise-heat stress. There were no differences (P > 0.05) in [Formula: see text], PSI, RPE, TS and whole-body sweat rate between PSD versus Norm.
Since greater physiological strain during exercise-heat stress did not follow three nights of PSD, it appears that sleep loss may have minimal impact upon thermal strain during exercise in the heat, at least as evaluated within this experiment.
暴露于完全睡眠剥夺的个体在热环境中进行长时间体力活动时，可能会经历体温调节受损和生理应激增加的风险。然而，对于更相关的部分睡眠剥夺（PSD）的影响知之甚少。本随机对照研究调查了 PSD 对运动-热应激期间热应激的影响。
10 名健康个体进行了两次应激测试（45 分钟跑步，70%[Formula: see text]33°C，40%RH）。每个试验都遵循三个晚上的控制睡眠：正常[479（SD 2）min 睡眠夜（-1）；Norm]和 PSD [116（SD 4）min 睡眠夜（-1）]。整个试验过程中都控制能量平衡和水合状态。在每个热应激试验期间，定期测量直肠温度（Tre）、平均皮肤温度（[Formula: see text]）、心率（HR）、RPE 和热感觉（TS）。
所有变量均有显著的时间主效应（P<0.05）。然而，在 PSD 和 Norm 之间，Tre[39.0（0.5）vs.39.1（0.5）°C]、[Formula: see text]、[36.1（0.6）vs.36.0（0.7）°C]和 HR[181（13）vs.182（13）beats min（-1））]在运动-热应激结束时没有差异（P>0.05）。在 PSD 与 Norm 之间，[Formula: see text]、PSI、RPE、TS 和全身出汗率没有差异（P>0.05）。
由于在运动-热应激期间没有出现更大的生理应激，因此在该实验中，似乎睡眠不足对热环境下运动时的热应激影响最小。
