Esmat Tiffany A, Clark Katherine E, Muller Matthew D, Juvancic-Heltzel Judith A, Glickman Ellen L
Exercise and Environmental Physiology Laboratory, Kent State University, Kent, OH 44242, USA.
Wilderness Environ Med. 2012 Dec;23(4):349-55. doi: 10.1016/j.wem.2012.05.004. Epub 2012 Jul 3.
Sleep deprivation and cold air exposure are both experienced in occupational and military settings but the combined effects of these 2 stressors is unknown. The purpose of this study was to determine the effects of 53 hours of total sleep deprivation on thermoregulation during the rewarming phase (25°C air) after acute cold air exposure (10°C air).
Eight young men underwent 2 trials in which they either received 7 hours of sleep at night or were totally sleep deprived. On 3 consecutive mornings, the subjects underwent 2 hours of cold air exposure followed by 2 hours of rewarming. Rectal temperature, mean skin temperature, oxygen consumption, and thermal sensation were measured.
Rewarming from acute cold air exposure caused a decline in rectal temperature (~0.5°C) each day but this was not different between subjects who were totally sleep deprived and subjects who received 7 hours of sleep at night. During this same period, mean skin temperature increased (from ~22°C to 27°C), oxygen consumption decreased (from ~7 to 4 mL·kg(-1)·min(-1)), and the participants felt warmer.
Under the conditions of the present study, sleep-deprived persons are not at a greater risk for a decline in rectal temperature (ie, a hypothermic afterdrop) during rewarming from cold air.
睡眠剥夺和暴露于寒冷空气中在职业和军事环境中都很常见，但这两种应激源的综合影响尚不清楚。本研究的目的是确定在急性冷空气暴露（10°C空气）后复温阶段（25°C空气）期间，53小时完全睡眠剥夺对体温调节的影响。
8名年轻男性进行了2次试验，他们要么晚上睡7小时，要么完全睡眠剥夺。在连续3个早晨，受试者先接受2小时的冷空气暴露，然后进行2小时的复温。测量直肠温度、平均皮肤温度、耗氧量和热感觉。
急性冷空气暴露后的复温导致每天直肠温度下降（约0.5°C），但完全睡眠剥夺的受试者与晚上睡7小时的受试者之间没有差异。在同一时期，平均皮肤温度升高（从约22°C升至27°C），耗氧量下降（从约7降至4 mL·kg-1·min-1），参与者感觉更暖和。
在本研究条件下，睡眠剥夺者在冷空气复温期间直肠温度下降（即体温过低后降）的风险并不更高。
