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首页> 外文期刊>European journal of applied physiology >Muscle hypertrophy, hormonal adaptations and strength development during strength training in strength-trained and untrained men.
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Muscle hypertrophy, hormonal adaptations and strength development during strength training in strength-trained and untrained men.

机译：在力量训练和未训练的男性中进行力量训练时，肌肉肥大，荷尔蒙适应和力量发展。

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Hormonal and neuromuscular adaptations to strength training were studied in eight male strength athletes (SA) and eight non-strength athletes (NA). The experimental design comprised a 21-week strength-training period. Basal hormonal concentrations of serum total testosterone (T), free testosterone (FT) and cortisol (C) and maximal isometric strength, right leg 1 repetition maximum (RM) of the leg extensors were measured at weeks 0, 7, 14 and 21. Muscle cross-sectional area (CSA) of the quadriceps femoris was measured by magnetic resonance imaging (MRI) at weeks 0 and 21. In addition, the acute heavy resistance exercises (AHRE) (bilateral leg extension, five sets of ten RM, with a 2-min rest between sets) including blood samples for the determination of serum T, FT, C, and GH concentrations were assessed before and after the 21-week training. Significant increases of 20.9% in maximal force and of 5.6% in muscle CSA in NA during the 21-week strength training period were greater than those of 3.9% and -1.8% in SA, respectively. There were no significant changes in serum basal hormone concentrations during the 21-week experiment. AHRE led to significant acute decreases in isometric force and acute increases in serum hormones both at weeks 0 and 21. Basal T concentrations (mean of 0, 7, 14 and 21 weeks) and changes in isometric force after the 21-week period correlated with each other (r=0.84, P<0.01) in SA. The individual changes in the acute T responses between weeks 0 and 21 and the changes in muscle CSA during the 21-week training correlated with each other (r=0.76, P<0.05) in NA. The correlations between T and the changes in isometric strength and in muscle CSA suggest that both serum basal testosterone concentrations and training-induced changes in acute testosterone responses may be important factors for strength development and muscle hypertrophy.
机译：在八名男性力量运动员（SA）和八名非力量运动员（NA）中研究了激素和神经肌肉对力量训练的适应性。实验设计包括21周的力量训练期。在第0、7、14和21周测量血清总睾丸激素（T），游离睾丸激素（FT）和皮质醇（C）的基础激素浓度以及最大等距强度，右腿伸肌的右腿1次重复最大值（RM）。在第0和21周时通过磁共振成像（MRI）测量股四头肌的肌肉横截面积（CSA）。此外，进行急性重阻力运动（AHRE）（双腿伸直，五组，每组10个RM），在21周的训练前后评估两组之间的2分钟休息时间，包括血液样本以确定血清T，FT，C和GH浓度。在21周的力量训练期间，北美最大力量的20.9％和肌肉CSA的显着增加分别大于SA的3.9％和-1.8％。在21周的实验中，血清基础激素浓度无明显变化。在第0周和第21周，AHRE导致等轴测力急剧下降，血清激素急剧上升。在21周后，基础T浓度（0、7、14和21周的平均值）和等轴测力的变化与SA中彼此之间（r = 0.84，P <0.01）。在NA中，第0至21周之间的急性T反应的个体变化与21周训练期间的肌肉CSA的变化彼此相关（r ＝ 0.76，P ＜0.05）。 T与等距力量和肌肉CSA的变化之间的相关性表明，血清基础睾丸激素浓度和训练诱发的急性睾丸激素反应变化可能是力量发展和肌肉肥大的重要因素。

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