Sleep Deprivation Depresses Thermoregulatory Responses to Physical Exercise

摘要

Thermoregulatory responses were examined in five male subjects during cycle ergometer exercise (50% of maximal aerobic power) in a temperature (Ta=28 deg C, rh=30%) environment. These exercise tests were conducted following normal sleep (control) and after 33 h of wakefulness. In comparison to control levels, sleep deprivation resulted in a greater increase (26%) in esophageal temperature from rest to final exercise values; sleep deprivation also resulted in reduced total body (27%) and local (19%) sweating rates as well as lowered sweating rate sensitivity (38%). An asynchronous rather than synchronous sweating rate pattern was frequently observed during the sleep deprivation test. Following sleep deprivation the threshold (0.11 deg C) and sensitivity (42%) for chest heat conductance were decreased. We conclude that sleep deprivation depressed thermoregulatory responses to physical exercise and that these responses may be mediated by the central nervous system. (Author)