Afternoon May Be the Best Time to Exercise

Why Afternoon May Be the Best Time to Exercise - NYTimes.com: " . . . . After several weeks of running, the exercising mice, no matter when they ran, were found to be producing more proteins in their internal-clock cells than the sedentary animals. But the difference was slight in these healthy animals, which all had normal circadian rhythms to start with. So the scientists turned to mice unable to produce a critical internal clock protein. Signals from these animals’ internal clocks rarely reach the rest of the body. But after several weeks of running, the animals’ internal clocks were sturdier. Messages now traveled to these animals’ hearts and livers far more frequently than in their sedentary counterparts. The beneficial effect was especially pronounced in those animals that exercised in the afternoon (or mouse equivalent). That finding, Dr. Colwell says, “was a pretty big surprise.” He and his colleagues had expected to see the greatest effects from morning exercise, a popular workout time for many athletes. . . ."


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