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A: mean activity measured across the 24-h day by accelerometer in 3 monkeys (symbols) at baseline, before monkeys started running on the treadmill 5 days/wk, and mean activity during the 23 h/day when monkeys were not running at the end of 12 wk of running (mean activity shown by bars). B: percent increase in total activity measured across the 24-h day at the end of 12 wk of running compared with the baseline period.
