Researchwearablescardiovascular healthcircadian rhythmobservational study
Morning Exercise Reduces Cardiovascular Risk Factors
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4.1
Researchers at Harvard Medical School and Beth Israel Deaconess Medical Center analyzed one year of wearable heart-rate data from about 15,000 adults to compare cardiovascular risk by exercise timing. Morning exercisers had 35% lower obesity risk, 31% lower coronary artery disease, 30% lower type 2 diabetes, 21% lower high cholesterol and 18% lower high blood pressure. The observational study notes possible circadian and lifestyle explanations but cautions it cannot establish causality.
Scoring Rationale
Moderate observational evidence with large wearable cohort supports associations, limited by non-causal design and potential confounders.
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