Specificity of strength gains after 12 weeks of isokinetic eccentric training in healthy men
Specificity of strength gains after 12 weeks of isokinetic eccentric training in healthy men
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DOI：
10.3233/ies-2011-0425
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发表时间：
2011-01-01
影响因子：
0.7
通讯作者：
Vaz, Marco Aurelio
中科院分区：
文献类型：
--
作者：
dos Santos Rocha, Clarice Sperotto;Baroni, Bruno Manfredini;Vaz, Marco Aurelio
虽然以前的研究已经证明骨骼肌适应是特定类型的刺激，但离心式训练研究提供了关于偏心、等长和同心测试中力量增长的有争议的结果。因此，本研究的目的是以股四头肌为模型，评估等速偏心训练方案下的力矩-速度适应性。20名体力活动男性被随机分配到对照组(CG；n=10)或离心力训练组(ETG；n=10)。评定膝关节伸肌扭矩-速度关系，包括等长测试和60度/S、120度/S、180度/S、240度/S和300度/S向心和偏心模式下的等速测试，在12周的偏心训练前后(每周3次；在60度/S沿90度运动范围最大重复2~5次/次)。等速偏心训练使膝关节伸肌扭矩在训练速度(59%)和相邻速度(120度/S时分别为24%和29%)显著增加。这些结果证明了等速偏心训练中力量增长与收缩类型和角速度的特异性。
Although previous studies have demonstrated that skeletal muscle adaptations were specific to the types of stimuli, eccentric training studies presented controversial results concerning strength gains in eccentric, isometric and concentric tests. Therefore, the goal of this study was to evaluate torque-velocity adaptations following isokinetic eccentric training protocol using the quadriceps as a model. Twenty physically active men were randomly assigned to a control group (CG; n = 10) or to an eccentric training group (ETG; n = 10). Knee extensor torque-velocity relationship including isometric tests and isokinetic tests at 60 degrees/s, 120 degrees/s, 180 degrees/s, 240 degrees/s and 300 degrees/s in concentric and eccentric modes, were assessed before and after a 12-week period of eccentric training (3 sessions/week; 2-5 sets of 7-9 maximal repetitions per session performed at 60 degrees/s along a range of motion 90 degrees). Isokinetic eccentric training significantly increased the knee extensor torque at the training velocity (59%) and at the adjacent velocities (24% at 120 degrees/s and 29% in the isometric test). These results demonstrate the specificity of strength gains in isokinetic eccentric training in relation to contraction type and to angular velocity.