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首页> 外文期刊>Scandinavian journal of medicine & science in sports. >Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations
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Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations

机译：耐速度损失在抗性训练期间对运动性能，力量增益和肌肉适应的影响

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摘要

We compared the effects of two resistance training ( RT ) programs only differing in the repetition velocity loss allowed in each set: 20% ( VL 20) vs 40% ( VL 40) on muscle structural and functional adaptations. Twenty‐two young males were randomly assigned to a VL 20 ( n ?=?12) or VL 40 ( n ?=?10) group. Subjects followed an 8‐week velocity‐based RT program using the squat exercise while monitoring repetition velocity. Pre‐ and post‐training assessments included: magnetic resonance imaging, vastus lateralis biopsies for muscle cross‐sectional area ( CSA ) and fiber type analyses, one‐repetition maximum strength and full load‐velocity squat profile, countermovement jump ( CMJ ), and 20‐m sprint running. VL 20 resulted in similar squat strength gains than VL 40 and greater improvements in CMJ (9.5% vs 3.5%, P ??0.05), despite VL 20 performing 40% fewer repetitions. Although both groups increased mean fiber CSA and whole quadriceps muscle volume, VL 40 training elicited a greater hypertrophy of vastus lateralis and intermedius than VL 20. Training resulted in a reduction of myosin heavy chain IIX percentage in VL 40, whereas it was preserved in VL 20. In conclusion, the progressive accumulation of muscle fatigue as indicated by a more pronounced repetition velocity loss appears as an important variable in the configuration of the resistance exercise stimulus as it influences functional and structural neuromuscular adaptations.
机译：我们比较了两种电阻训练（RT）程序的影响，只有在每个集合中允许的重复速度损失的效果：20％（VL 20）与40％（VL 40）上的肌肉结构和功能适应。将二十两只幼小雄性随机分配给VL 20（n？= 12）或VL 40（n？= 10）组。受试者跟随基于8周的速度的RT程序，在监测重复速度的同时使用蹲坐运动。培训前和培训后评估包括：磁共振成像，肌肉横截面积（CSA）和纤维型分析，一次重复最大强度和全负荷 - 速度蹲下轮廓，对策跳跃（CMJ），以及20米冲刺跑步。 VL 20导致比VL 40类似的脉冲强度增益，并且CMJ的更大改善（9.5％Vs 3.5％，P≤0.05），尽管VL 20执行40％较少的重复。虽然两个组增加了平均纤维CSA和全高等肌肌肉体积，但VL 40培训引发了大量左侧的肥大，尤其是VL 20。培训导致VL 40中的肌球蛋白重链IIX百分比减少，而它被保存在VL中总之，如更明显的重复速度损失所示的肌肉疲劳的渐进积累表现为电阻运动刺激的配置中的重要变量，因为它影响功能性和结构性神经肌肉适应性。

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