A recent study reveals that aligning exercise timing with your natural body clock—whether you are a morning lark or a night owl—can significantly lower the risk of heart disease. Researchers suggest that tailoring workout schedules to an individual’s chronotype may be particularly effective for those with high blood pressure or other cardiovascular risk factors.
Published in the journal Open Heart, the study focused on chronotypes—people’s inherent genetic tendencies to be active and wake up at certain times. Participants, aged 40 to 60 and all with at least one heart risk factor such as hypertension, obesity, or physical inactivity, were assessed using questionnaires and 48-hour core body temperature measurements to determine if they were morning or evening types.
The 150 participants were split into groups based on whether their exercise sessions—conducted over 12 weeks—matched their chronotype. Workouts were scheduled from 8 a.m. to 11 a.m. for morning types and 6 p.m. to 9 p.m. for evening types. Out of these, 134 completed all 60 exercise sessions.
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Findings showed improvements in blood pressure, aerobic fitness, and sleep quality for all participants; however, those exercising in sync with their chronotype experienced greater reductions in blood pressure and enhanced heart rate, aerobic capacity, and sleep quality. Notably, morning larks benefited more prominently than night owls.
The researchers emphasize that these results support the idea of including chronotype assessments in exercise prescriptions for preventing cardiometabolic diseases. Personalized, time-matched exercise routines may boost both clinical outcomes and participant engagement.
Dr. Rajiv Sankaranarayanan of the British Cardiovascular Society commented on the implications for the UK’s NHS, highlighting the potential of simple chronotype evaluations to improve adherence and outcomes in preventive cardiology. He also noted the importance of validating these findings in diverse populations, including shift workers and multi-ethnic groups, before broad application.
This research signals a promising shift toward circadian-informed, personalized exercise regimens in cardiovascular care, aligning medical advice with our natural biological rhythms for optimal heart health.