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Chronobiol Int. 2011 Apr;28(3):282-4. doi: 10.3109/07420528.2011.552820.

Elevated variance in heart rate during slow-wave sleep after late-night physical activity.

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M3-BIORES, K. U. Leuven, Heverlee, Belgium.


This study investigates the effect of mild physical activity before bedtime on the sleep pattern and heart rate during the night. Nine healthy subjects underwent a habituation night, a reference night, and a physical induction night. The physical induction night did not alter the sleep pattern. Physical activity before bedtime resulted in higher heart rate variance during slow-wave sleep. The low-frequency/high-frequency component (LF/HF) ratio during slow-wave sleep in the physical induction night was significantly higher than during the reference night. Increased mean heart rate and higher LF/HF ratio are related to decreased parasympathetic dominance. Exercise up to 1 h before bedtime thus seems to modify the quality of sleep.

[Indexed for MEDLINE]

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