Ozawa K, Hashimoto A, Oiwa H
Undersea Medical Center, Japan Maritime Self-Defense Force, Kanagawa.
Undersea Biomed Res. 1991 Sep-Nov;18(5-6):397-412.
The standard polysomnogram and questionnaire were measured from 4 subjects during 2 simulated 200-m heliox saturation dives. These measurements were performed for 1 precompression night, bottom nights, 4 or 5 nights during decompression, and 1 postdecompression night. Although the subjects reported a marked decrease in quantity and quality of sleep at the bottom, only a slight degree of sleep disturbance caused by frequent awakenings was found in polysomnograms. Throughout the dive period, latency of each sleep stage, quantity of REM sleep, and the REM-NREM cycle showed no changes, whereas quantity of slow wave sleep remained at a low level. From these results it was inferred that basic sleep mechanisms were not affected under 200-m heliox environment. Unusual physiologic phenomena were observed during the dive period. Intermittent diffuse rhythmic theta activity was found in 1 subject at sleep stage REM during the bottom. Rhythmic contraction of facial muscles, which was similar to bruxism, increased, particularly at sleep stage 2 in all subjects during decompression.
在2次模拟的200米氦氧饱和潜水过程中，对4名受试者进行了标准多导睡眠图和问卷调查。这些测量在1个预压缩夜、水底夜、减压期间的4或5个夜晚以及1个减压后夜晚进行。尽管受试者报告在水底时睡眠的数量和质量显著下降，但在多导睡眠图中仅发现因频繁觉醒导致的轻微睡眠障碍。在整个潜水期间，每个睡眠阶段的潜伏期、快速眼动睡眠量和快速眼动 - 非快速眼动周期均无变化，而慢波睡眠量维持在较低水平。从这些结果推断，在200米氦氧环境下基本睡眠机制未受影响。在潜水期间观察到了异常生理现象。在水底时，1名受试者在快速眼动睡眠阶段出现间歇性弥漫性节律性θ活动。面部肌肉的节律性收缩增加，类似于磨牙症，在减压期间所有受试者的睡眠第2阶段尤为明显。
