低环境温度对人类睡眠期间心率变异性的影响。
Effects of low ambient temperature on heart rate variability during sleep in humans.
作者信息
Okamoto-Mizuno Kazue, Tsuzuki Kazuyo, Mizuno Koh, Ohshiro Yasushi
机构信息
National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 6, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8566, Japan.
出版信息
Eur J Appl Physiol. 2009 Jan;105(2):191-7. doi: 10.1007/s00421-008-0889-1. Epub 2008 Oct 21.
The effects of cold exposure on heart rate variability (HRV) during sleep were examined. Eight male subjects slept under three different conditions: 3 degrees C, 50-80% relative humidity (RH) [3]; 10 degrees C, 50% RH [10]; and 17 degrees C 50% RH [17]. No significant differences were observed in HRV during rapid eye movement sleep (REM) and wakefulness. The ratio of the low frequency (LF) to high frequency component (HF) of HRV (LF/HF) significantly differed among the conditions during stage 2 and slow wave sleep (SWS) that decreased as the ambient temperature decreased. The normalized LF [LF/(LF + HF)] significantly decreased in 3 and 10 than in 17 during SWS. In low ambient temperature, predominant cardiac parasympathetic activity during stage 2 with no significant difference during REM and wakefulness may cause variations in HRV at transition from stage 2 to REM and wakefulness. These results may partly explain the peak in adverse cardiac events during winter.
研究了睡眠期间冷暴露对心率变异性（HRV）的影响。八名男性受试者在三种不同条件下睡眠：3摄氏度，相对湿度（RH）50 - 80% [3]；10摄氏度，50% RH [10]；以及17摄氏度，50% RH [17]。在快速眼动睡眠（REM）和清醒期间，HRV未观察到显著差异。在第二阶段睡眠和慢波睡眠（SWS）期间，HRV的低频（LF）与高频成分（HF）之比（LF/HF）在不同条件下存在显著差异，且随着环境温度降低而降低。在SWS期间，归一化的LF [LF/(LF + HF)]在3摄氏度和10摄氏度时比在17摄氏度时显著降低。在低环境温度下，第二阶段睡眠期间主要的心脏副交感神经活动在REM和清醒期间无显著差异，这可能导致从第二阶段睡眠过渡到REM和清醒时HRV发生变化。这些结果可能部分解释了冬季心脏不良事件的高峰。
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