Five normal male volunteers performed two intermittent weight lifting exercises of equal total external work output and duration (20 min). Exercise I consisted of seven sets of seven vertical leg lifts at 85 per cent of the subject's repetition maximum and, 5 days later, seven sets of 21 vertical leg lifts with one-third of the previously used load (Exercise II). Growth hormone increased after 20 min of Exercise I to a peak during the recovery period. Significantly elevated growth hormone (GH) levels were found after 5,10, and 15 min of recovery after Exercise I. No significant elevations of GH occurred in Exercise II.
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