부산대학교 도서관

Exercise is believed to improve sleep, i.e., it reduces sleep latency and increases slow wave sleep. However, there are studies reporting contrary to this consensus that exercise had an adverse effect on sleep architecture. Therefore, discrepancies in the effects of exercise on sleep architecture remain to be explained. We enrolled 9 healthy young males （mean±SEM: 23.8±2.1 years） in a cross-over intervention study, assessed by core body temperature and indirect calorimetry, and on sleep quality during subsequent sleep, assessed by quality of sleep polysomnography. Subjects exercised at 60 % of V･O2max for 60 min beginning at 6 hours before bedtime using a treadmill or remained seated. Exercise increased the energy expenditure throughout the following sleep phase 5 h later. The objective measurements, based on polysomnographic recordings revealed that exercise trial shortens slow wave sleep time and REM sleep latency （∼28 min） . Average δ power in N3 is shifted toward higher δ power in the trial with exercise compared to controls trial. In addition, The coefficient of variation of the envelope values were significantly lower than control trial. Although, traditional objective such as duration of sleep stages consequences in exercise trial were not enhanced. Detailed analysis of the sleep electro-encephalogram showed significantly increased delta （0.5-4 Hz） power in SWS （N3） together with increased SWS stability based on the coefficient of variation of the envelope of delta waves in early sleep phases. Vigorous exercise performed at 6 hours before bedtime might impair subjective sleep quality