Hormonal
The endogenous circadian system modulates cardiovascular risk markers (cortisol, catecholamines, blood pressure) and their reactivity to exercise, creating specific vulnerable windows (morning and evening peaks) for adverse cardiovascular events independent of behavioral triggers.
Your body has an internal clock that makes your heart and blood vessels more vulnerable to stress at specific times, particularly in the morning (around 9 AM) and evening (around 8 PM). While you cannot change your genetics, you can be aware that high-intensity exercise or high-stress tasks performed during these 'biological morning' hours may place greater strain on your cardiovascular system than the same activity performed at other times. If you have known heart conditions, discuss optimal exercise timing with your doctor.
Thus, the circadian system modulates numerous cardiovascular risk markers at rest as well as their reactivity to exercise, with resultant profiles that could potentially contribute to the day/night pattern of adverse cardiovascular events.
Why this rating
High-quality experimental design (forced desynchrony protocol) in healthy humans, though generalizability to high-risk patients is inferred.
Source
Impact of the human circadian system, exercise, and their interaction on cardiovascular function
Frank A. J. L. Scheer et al. · Proceedings of the National Academy of Sciences · 2010
DOI 10.1073/pnas.1006749107
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