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Abstract
Previous studies have failed to demonstrate that aerobic exercises increase the adrenocortical activity in prepubescent boys. The purpose of the present study was to check this fact using a longitudinal approach. Two cohorts of boys participated in a one-year follow-up. The first cohort consisted of 14 boys at sexual maturation stage 1 (age 10 to 11 years) and the second cohort of 5 boys at stage 2 (age 12 years) at the onset of the observation. Boys performed 20-min aerobic exercise on a cycle ergometer at the beginning and end of the year of observation. Before and 5 min after the exercise, blood cortisol and testosterone were determined by radioimmunoassays. Before the onset of puberty (stage 1) cortisol increase during exercise was found in only 25% of boys. Exercise induced significant increase of cortisol level after achieving sexual maturation stage 2. Testosterone response was insignificant at the first three stages of sexual maturation.
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