Morning vs. Evening Exercise: New Study Highlights Heart Health Benefits of Early Workouts
The long-standing debate over the ideal time for exercise—morning or evening—has gained fresh insights from a recent scientific study. While personal preferences and schedules often dictate workout timing, new research suggests that early morning exercise may offer distinct advantages for heart health.
Study Details and Methodology
Presented at the American College of Cardiology’s Annual Scientific Session (ACC.26), the study analyzed data from over 14,000 participants to explore how exercise timing impacts cardiometabolic risk. Researchers collected health records and minute-level heart rate data from Fitbit devices over a year, tracking physical activity bursts defined by elevated heart rates lasting 15 consecutive minutes or more.
Lead author Prem Patel, a medical student at the University of Massachusetts Chan Medical School, emphasized in a release that while any exercise is beneficial, timing adds a crucial dimension. "If you can exercise in the morning, it seems to be linked with better rates of cardiometabolic disease," Patel stated.
Key Findings on Morning Exercise Benefits
The findings revealed striking associations between early morning workouts and reduced risks of various health conditions. Compared to evening exercisers, those who worked out in the morning showed significantly lower likelihoods of:
- 31% less risk of coronary artery disease
- 18% less risk of high blood pressure
- 21% less risk of hyperlipidemia
- 30% less risk of Type 2 diabetes
- 35% less risk of obesity
Notably, these benefits were independent of the total daily physical activity amount, and exercise between 7:00 and 8:00 a.m. was linked to the lowest odds of coronary artery disease.
Implications for Public Health
High blood pressure, diabetes, and obesity are key markers of cardiometabolic disease, which increases the risk of heart disease—the leading cause of death globally. Regular physical activity is known to reduce these risks, but this study highlights the potential added value of timing.
Patel explained that wearable devices have enabled more granular analysis: "In the past, researchers have mainly looked at how much physical activity to do—the number of minutes or the intensity. Now, with 1 in 3 Americans having a wearable device, we're gaining the ability to look at exercise at the minute-by-minute level, and that opens a lot of doors in terms of new analyses."
The study underscores that incorporating morning exercise into daily routines could be a simple yet effective strategy for improving heart health and reducing disease burden.
