Plasma catecholamine and serum testosterone responses to four units of resistance exercise in young and adult male athletes |
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Authors: | Teemu Pullinen Antti Mero Ewen MacDonald Arto Pakarinen and Paavo V Komi |
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Institution: | (1) Department of Biology of Physical Activity, University of Jyv?skyl?, FIN-40351 Jyv?skyl?, Finland, FI;(2) Department of Pharmacology and Toxicology, University of Kuopio, Kuopio, Finland, FI;(3) Department of Clinical Chemistry, University of Oulu, Oulu, Finland, FI |
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Abstract: | The plasma noradrenaline (NA) and adrenaline (A) concentration responses of seven young male athletes 15 (SD 1) years] and
seven adult male athletes 25 (SD 6) years] were investigated together with the serum testosterone (Tes) concentration responses
in four different half-squatting exercises. The loads, number of repetitions, exercise intensity and recovery between the
sets were manipulated such that different types of metabolic demand could be expected. However, the amount of work done was
kept equal in each kind of exercise. After the most exhausting unit of exercise (E3; two sets of 30 repetitions with 50% of
1 repetition maximum and with 2-min recovery between the sets) the plasma NA concentration was significantly lower in the
younger than in the adult subjects 15.7 (SD 7.8) vs 32.7 (SD 13.2) nmol · l−1, P < 0.05], while the A concentrations were similar. In the other three exercises no differences in the plasma catecholamine
concentration responses among the groups were observed. The postexercise Tes concentrations, however, were significantly lower
in the younger than in the adult subjects in every exercise unit. No correlations between the plasma catecholamine and serum
Tes concentration responses were observed in any of the exercise units in either group. The results of the present study may
suggest reduced sympathetic nervous activity in the younger subjects compared to the adults in response to exhausting resistance
exercise. The results may also suggest that the catecholamines were less involved in eliciting an increase in Tes secretion
in these resistance exercises.
Accepted: 11 November 1997 |
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Keywords: | Catecholamines Testosterone Resistance exercise Age |
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