Early Birds and Night Owls Don’t Build Muscle the Same
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Muscle O’Clock: When it comes to building and maintaining muscle, a new review suggests it’s not just what you do that matters — it may also be when you do it. Your circadian rhythm, or internal body clock, influences everything from hormone production to appetite, metabolism, sleep quality, and muscle recovery. And that could give morning larks and night owls different health trajectories over time.
The Study: In a review published in Nutrients, researchers analyzed prior studies on circadian rhythms, muscle protein synthesis, exercise timing, sleep, meal timing, and metabolism. They found that people with an evening chronotype (“night owls”) tend to have behaviors linked to poorer muscle health, including irregular sleep schedules, later eating patterns, lower physical activity levels, and worse metabolic markers. These factors may make it harder to preserve muscle mass and strength over time.
The Takeaway: The headline here isn’t that night owls are doomed to lose muscle. Rather, the review suggests that consistent routines are an important key to muscle health. Prioritizing adequate protein, regular exercise, and sufficient sleep — and avoiding irregular sleep and eating schedules — may help protect muscle health for evening chronotypes.
Keep in Mind: Working with your chronotype, not against it, will yield greater consistency in healthy habits, thus promoting muscle health.
