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Free Content Effect of ambient temperature on arterial pressure variability during sleep in the rat

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Changes in mean arterial pressure (MAP) and heart rate (HR) during sleep were recorded at three ambient temperatures (Ta: 16, 22 and 28°C). MAP and HR during sleep increased with lowering of Ta. The increase in MAP during the transition from NREM to REM sleep was decreased by lowering the Ta. At 28°C, the average HR increased in going from NREM to REM sleep, while, at 16°C, it decreased. The coefficient of variation (CV%) of the MAP during REM sleep decreased as the Ta was lowered, while that seen during NREM sleep was unchanged. This study suggests that Ta has a greater effect than sleep stage on the MAP and HR, and that MAP variability during REM sleep is greater at higher Ta.
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Document Type: Research Article

Affiliations: Department of Physiology, School of Medicine, The University of Tokushima, Tokushima 770, Japan

Publication date: March 1, 1996

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