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World records are often broken later in the day—and scientists wonder if muscle clocks explain the difference.
Findings
Additional insights we found via NPR
For reasons that are still not entirely clear, on average, people tend to lift more weight and achieve other exercise feats later in the day.
Theories to explain this discrepancy include that muscle clocks are at peak performance in the afternoon and that there's morning-to-afternoon variation in core body temperature, hormones, and neural activity.
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