The contribution of muscle hypertrophy to strength changes following resistance training
The contribution of muscle hypertrophy to strength changes following resistance training
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DOI：
10.1007/s00421-014-2855-4
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发表时间：
2014-06-01
影响因子：
3
通讯作者：
Folland, Jonathan P.
中科院分区：
文献类型：
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作者：
Erskine, Robert M.;Fletcher, Gareth;Folland, Jonathan P.
虽然骨骼肌肥大被认为是一个重要的适应阻力训练（RT），它还没有被发现，以解释在RT后的力量个体间的变化。这项研究调查了肥大的贡献，个人收益后，12周的肘屈肌RT等长，等惯性和爆发力。33个以前未经训练，健康男性（18-30岁）完成了最初3周的肘屈肌RT（以促进神经反应），然后6周不训练，然后12周肘屈肌RT。单侧肘屈肌肌力[等长最大随意力（iMVF），单次重复最大（1-RM）和爆发力]，肌肉体积（V（m））、肌束羽状角在12周RT前后评估了（θ（p））和标准化激动剂、拮抗剂和稳定剂sEMG。V（m）的百分比增加与iMVF的百分比变化相关（r = 0.527; P = 0.002）和1-RM（r = 0.482; P = 0.005），但爆炸力（ra千分率货币符号0.243; Pa千分率日元0.175）没有变化。iMVF、1-RM和爆发力的百分比变化与激动剂、拮抗剂或稳定剂sEMG的百分比变化无关（均P > 0.05）。在力量开始后150 ms时，θ（p）的百分比增加与标准化爆发力的百分比变化呈负相关（r = 0.362; P = 0.038）。我们首次表明，肌肉肥大解释了健康年轻男性12周肘屈肌RT后等长和等惯性力量增加的个体间差异的显著比例。
Whilst skeletal muscle hypertrophy is considered an important adaptation to resistance training (RT), it has not previously been found to explain the inter-individual changes in strength after RT. This study investigated the contribution of hypertrophy to individual gains in isometric, isoinertial and explosive strength after 12 weeks of elbow flexor RT.Thirty-three previously untrained, healthy men (18-30 years) completed an initial 3-week period of elbow flexor RT (to facilitate neurological responses) followed by 6-week no training, and then 12-week elbow flexor RT. Unilateral elbow flexor muscle strength [isometric maximum voluntary force (iMVF), single repetition maximum (1-RM) and explosive force], muscle volume (V (m)), muscle fascicle pennation angle (theta (p)) and normalized agonist, antagonist and stabilizer sEMG were assessed pre and post 12-week RT.Percentage gains in V (m) correlated with percentage changes in iMVF (r = 0.527; P = 0.002) and 1-RM (r = 0.482; P = 0.005) but not in explosive force (r a parts per thousand currency sign 0.243; P a parts per thousand yen 0.175). Percentage changes in iMVF, 1-RM, and explosive force did not correlate with percentage changes in agonist, antagonist or stabilizer sEMG (all P > 0.05). Percentage gains in theta (p) inversely correlated with percentage changes in normalized explosive force at 150 ms after force onset (r = 0.362; P = 0.038).We have shown for the first time that muscle hypertrophy explains a significant proportion of the inter-individual variability in isometric and isoinertial strength gains following 12-week elbow flexor RT in healthy young men.