Respecting the body’s clocks

Daily rhythms affect everything from the time we wake to how well we perform in sports

By Amanda Leigh Mascarelli, 19:55 PM July 11, 2013

Olympic athletes spend much of their lives preparing for a shot at a medal. Whether they take home a gold or no medal at all comes down to tiny differences in speed and precision. Many factors affect performance, from genetics and training to diet and confidence. Lately, athletes, coaches and researchers have begun taking a close look at another factor — time of day. When athletes compete can also influence performance, scientists are finding.

People are precisely tuned to eat, sleep and wake ...

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