Key result
Acute sleep deprivation lowers exercise heart rate compared to normal sleep without affecting oxygen uptake.
Why the study?
The effects of temporary sleep deprivation on heart rate during moderate intensity exercise were unclear, particularly regarding exercise prescription based on heart rate in sleep-deprived individuals.
Does temporary sleep deprivation alter oxygen uptake and heart rate during moderate-intensity exercise in healthy males?
Does temporary sleep deprivation alter oxygen uptake and heart rate during moderate-intensity exercise in healthy males?
Sleep deprivation lowers the heart rate response during moderate exercise, suggesting that using heart rate to prescribe exercise intensity in sleep-deprived individuals may inadvertently lead to a higher actual physiological workload.
May warrant caution with HR-guided exercise prescription after sleep loss; hypothesis-generating and requires prospective validation.
This study aimed to clarify the effects of sleep deprivation on heart rate during exercise. Eleven healthy males (21.5 ± 1.0 year, 174.4 ± 9.3 cm, 70.7 ± 10.9 kg) performed a 30-min load exercise using a bicycle ergometer at 60% maximal oxygen uptake. This study was carried out over two days: once after a night of normal sleep and once after a sleep-deprived night. The measurements were examined using a two-way ANOVA (time and sleep conditions). Oxygen uptake during middle intensity exercise was not significantly altered by sleep deprivation (p = 0.25), but heart rate was significantly lower (p < 0.05). These results suggest that the use of heart rate for predicting exercise intensity is more effective after a sleep-deprived night.
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Sekikawa et al. (2015) studied this question. Temporary sleep deprivation vs. Normal sleep was evaluated on Heart rate during moderate intensity exercise (p=<0.05). Temporary sleep deprivation significantly lowered heart rate during moderate-intensity exercise compared to a night of normal sleep, without altering oxygen uptake.
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