Abstract
To characterise the specific GH responses to repeated bouts of standardised aerobic exercise in amateur competitive cyclists, 6 volunteers (mean age±SE: 28.7±2.3 yr, range: 18–35 yr) performed two consecutive 30-min cycling sessions at 80% of individual maximal oxygen uptake on three occasions with different time interval between bouts: 2 h (EXP A), 4 h (EXP B) and 6 h (EXP C). Serum GH concentration was determined in blood samples collected at 15-min intervals during exercise and following 1 h of recovery. In EXP A and EXP B, peak GH concentration in response to the second bout was significantly lower (p < 0.01 ) than that of the first bout, but in EXP C no difference was detected between bouts.
Similarly, the average integrated GH concentration (AUC), determined during the exercise period and in the following 1 h of recovery in the course of the second bout, was significantly lower than that observed during the first bout only in EXP A (p <0.05) and EXP B (p <0.01) and not in EXP C, so that the second bout AUC of EXP C was significantly higher than that of EXP A (p<0.01) and EXP B (p<0.01 ). It was concluded that GH responses to subsequent bouts of aerobic exercise are dependent on the time interval between the exercise sessions.
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Sartorio, A., Agosti, F., Marinone, P.G. et al. Growth hormone responses to repeated bouts of aerobic exercise with different recovery intervals in cyclists. J Endocrinol Invest 28, RC11–RC14 (2005). https://doi.org/10.1007/BF03347214
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DOI: https://doi.org/10.1007/BF03347214