Shapiro C M, Warren P M, Trinder J, Paxton S J, Oswald I, Flenley D C, Catterall J R
Eur J Appl Physiol Occup Physiol. 1984;53(1):1-4. doi: 10.1007/BF00964680.
Eight army recruits were studied at the start, middle, and end of their initial 18-week training programme. At each point the subjects were studied for four consecutive nights in the sleep laboratory. Their sleep was characterized by the means of the recordings on the last two nights. Within 2 days of the sleep recordings (but never on the same day) each subject spent 2 non-consecutive days in the exercise laboratory. On the 1st day a maximum oxygen consumption (VO2 max) measurement was performed on a treadmill and on the 2nd day a 24-min progressive exercise bicycle ergometer test was carried out with simultaneous venous sampling (for lactic acid measurements) and oxygen consumption recordings from which the lactate turn point (LTP) was calculated. LTP was used as a measure of fitness. Approximately 1 week after the above measures lean muscle mass as calculated by total body potassium estimation was obtained for each subject. Slow wave sleep (SWS) as a percentage of total sleep time increased significantly between the start and the measurements at 9 and 18 weeks, being 21.9%, 29.9%, and 28.5% respectively. Anaerobic threshold increased significantly (P less than 0.05) over the first 9 weeks and continued to increase to the end of the training period (P less than 0.001) using VO2 when lactate level was 2 mmol/l as a percentage of VO2 max. With increase in fitness, sleep onset latency and wake time during sleep decreased and sleep efficiency improved. The results suggest that as fitness increases sleep quality improves.
八名新兵在其为期18周的初始训练计划开始、中期和结束时接受了研究。在每个时间点，受试者在睡眠实验室连续研究四个晚上。他们的睡眠以最后两个晚上的记录平均值为特征。在睡眠记录后的2天内（但绝不在同一天），每个受试者在运动实验室度过2个非连续的日子。第一天在跑步机上进行最大耗氧量（VO2 max）测量，第二天进行24分钟的渐进式运动自行车测力计测试，同时进行静脉采样（用于乳酸测量）和耗氧量记录，从中计算乳酸拐点（LTP）。LTP被用作衡量身体素质的指标。在上述测量后约1周，通过全身钾估计计算出每个受试者的瘦肌肉质量。慢波睡眠（SWS）占总睡眠时间的百分比在开始时与第9周和第18周的测量之间显著增加，分别为21.9%、29.9%和28.5%。当乳酸水平为2 mmol/l时，以VO2占VO2 max的百分比计算，无氧阈值在最初9周内显著增加（P小于0.05），并在训练期结束时持续增加（P小于0.001）。随着身体素质的提高，睡眠开始潜伏期和睡眠期间的清醒时间减少，睡眠效率提高。结果表明，随着身体素质的提高，睡眠质量得到改善。
