Effects of low ambient temperature on heart rate variability during sleep in humans |
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| Authors: | Kazue Okamoto-Mizuno Kazuyo Tsuzuki Koh Mizuno Yasushi Ohshiro |
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| Affiliation: | (1) National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 6, 1-1-1, Higashi, Tsukuba Ibaraki, 305-8566, Japan;(2) Tohoku Fukushi University, Center for Welfare and Health Improvement, 6-149-1 Kunimi, Aoba-ku, Sendai Miyagi, 989-3201, Japan;(3) Department of Early Childhood and Primary Education, Tohoku Fukushi University, 6-149-1 Kunimi, Aoba-ku, Sendai Miyagi, 989-3201, Japan;(4) Ibaraki Industrial Technology Center, 3781-1, Nagaoka, Ibaraki, HigashiIbaraki, Ibaraki 311-3195, Japan;(5) National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1-6 Azuma, Tsukuba Ibaraki, 305-8566, Japan |
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| Abstract: | ![]()
The effects of cold exposure on heart rate variability (HRV) during sleep were examined. Eight male subjects slept under three different conditions: 3°C, 50–80% relative humidity (RH) [3]; 10°C, 50% RH [10]; and 17°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. |
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| Keywords: | Low ambient temperature Sleep stages Heart rate variability Humans |
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