Pullinen T, Mero A, MacDonald E, Pakarinen A, Komi P V
Department of Biology of Physical Activity, University of Jyväskylä, Finland.
Eur J Appl Physiol Occup Physiol. 1998 Apr;77(5):413-20. doi: 10.1007/s004210050353.
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 x 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.
研究了7名年轻男性运动员[15（标准差1）岁]和7名成年男性运动员[25（标准差6）岁]在四种不同半蹲练习中的血浆去甲肾上腺素（NA）和肾上腺素（A）浓度反应以及血清睾酮（Tes）浓度反应。对负荷、重复次数、运动强度和组间恢复进行了控制，以便预期不同类型的代谢需求。然而，每种运动的工作量保持相等。在最剧烈的运动单元（E3；两组，每组30次重复，负荷为1次最大重复量的50%，组间恢复2分钟）后，年轻受试者的血浆NA浓度显著低于成年受试者[15.7（标准差7.8）对32.7（标准差13.2）nmol·L⁻¹，P<0.05]，而A浓度相似。在其他三种运动中，未观察到各组间血浆儿茶酚胺浓度反应的差异。然而，在每个运动单元中，年轻受试者运动后的Tes浓度均显著低于成年受试者。在两组的任何运动单元中，均未观察到血浆儿茶酚胺浓度反应与血清Tes浓度反应之间的相关性。本研究结果可能表明，与成年人相比，年轻受试者在进行剧烈抗阻运动时交感神经活动降低。结果还可能表明，在这些抗阻运动中，儿茶酚胺在引发Tes分泌增加方面的作用较小。
