Key result
Exercising at 04:00 h resulted in a significantly higher mean arterial blood pressure reactivity (8-14 mm Hg higher, p<0.05) compared to other times of day, independent of sleep effects.
Why the study?
Does the time of day affect post-exercise blood pressure reactivity in normotensive males independently of sleep?
Population
6 normotensive males
Comparison
Controlled bout of exercise on a cycle ergometer… vs Controlled bout of exercise at 16:00, 18:00…
Design
Other
Follow-up
20 minutes post-exercise
Authors
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Time-of-day may influence post-exercise BP reactivity; hypothesis-generating and should not yet change practice.
Does the time of day affect post-exercise blood pressure reactivity in normotensive males independently of sleep?
Effect estimate: 8-14 mm Hg higher
p-value: p=<0.05
Mean arterial blood pressure shows the highest reactivity to exercise in the early morning, a circadian phenomenon independent of the residual effects of sleep.
Jones et al. (2008) studied Normotensive (n=6). Exercise at 04:00 h vs. Exercise at other clock-hours (06:00, 08:00, 10:00, 16:00, 18:00, 20:00, 22:00 h) was evaluated on Mean arterial BP reactivity 15 min after exercise (8-14 mm Hg higher, p=<0.05). Exercising at 04:00 h resulted in a significantly higher mean arterial blood pressure reactivity (8-14 mm Hg higher, p<0.05) compared to other times of day, independent of sleep effects.
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