Workout timing matters
A recent report highlights a study finding that syncing workouts with your natural body clock can improve heart‑health markers — including lowering “bad” cholesterol and reducing blood pressure (medicalnewstoday.com). The coverage frames timing as an additional variable to consider alongside exercise type and volume, reporting measurable changes in those cardiovascular markers when exercise aligns with circadian rhythm (medicalnewstoday.com).
Your body runs on a 24-hour clock, and a new trial found workouts worked better when they matched that clock. (openheart.bmj.com) Researchers reported April 14 in *Open Heart* that 150 sedentary adults ages 40 to 60 with at least one cardiovascular risk factor were sorted as morning types or evening types, then assigned to exercise either at their preferred time or the opposite one. (openheart.bmj.com) The trial ran in Lahore, Pakistan, from January to June 2025, and the program was tightly controlled: five supervised sessions a week, 40 minutes each, of moderate-intensity aerobic exercise for 12 weeks. (bmjgroup.com) A circadian rhythm is the body’s built-in daily timing system, which helps set sleep, hormone release, heart rate, blood pressure, and energy levels across the day. (pmc.ncbi.nlm.nih.gov) The study used a standard Morningness-Eveningness Questionnaire and 48-hour core body temperature monitoring to classify people as “morning larks” or “night owls.” (openheart.bmj.com) Among the 134 people who finished, the chronotype-matched group had a bigger drop in systolic blood pressure than the mismatched group: 10.8 millimeters of mercury versus 5.5 millimeters of mercury. (openheart.bmj.com) The matched group also posted larger gains in diastolic blood pressure, heart rate variability, peak oxygen use, low-density lipoprotein cholesterol, fasting glucose, and sleep-quality scores. (openheart.bmj.com) The researchers said early chronotypes did better with morning exercise, while late chronotypes did better with evening sessions, a result that points to timing as one more variable in exercise prescriptions. (openheart.bmj.com) Both groups improved after 12 weeks, which means the trial did not find that one clock time is best for everyone; it found that matching the person mattered more than forcing a universal schedule. (bmjgroup.com) The paper adds a timing question to advice that usually focuses on minutes per week, intensity, and consistency: if you already exercise, when you do it may shape how much cardiovascular benefit you get. (openheart.bmj.com)
