Abstract
Plasma growth hormone (GH), cortisol, luteinizing hormone (lutropin, LH), testosterone, androstenedione, estrone and estradiol levels were investigated before and after strenuous anaerobic running exercise of short duration in five male runners. After the exercise there were statistically significant increases in the mean plasma concentrations of GH (233%), LH (49%), testosterone (13%) and androstenedione (34%). Plasma cortisol increased only slightly. The testosterone and androstenedione concentrations in the samples taken 6 h after exercise were below the control levels (51 and 40%, respectively). This effect was more pronounced than during the day of normal activity when in the same subjects the testosterone concentration decreased only 12%, and the androstenedione concentration did not change at all. Exercise affected plasma estradiol levels in the same way as it did testosterone and estrone levels in the same way as cortisol. Control values were not reattained for some of the hormones until more than 24 h after the run. In this study the most fit runner showed greater LH, testosterone, androstenedione and cortisol response than the least fit runner, who had a more elevated GH level after the run.
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