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首页> 外文期刊>Journal of strength and conditioning research >EFFECT OF ACUTE FATIGUE AND TRAINING ADAPTATION ON COUNTERMOVEMENT JUMP PERFORMANCE IN ELITE SNOWBOARD CROSS ATHLETES
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EFFECT OF ACUTE FATIGUE AND TRAINING ADAPTATION ON COUNTERMOVEMENT JUMP PERFORMANCE IN ELITE SNOWBOARD CROSS ATHLETES

机译：急性疲劳和训练适应对精英雪板交叉运动员的对抗运动跳跃性能的影响

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Countermovement jump performance was examined in response to acute neuromuscular (NM) fatigue (study I) and chronic training (study II) in elite snowboard cross (SBX) athletes, through both typical (countermovement jump [CMJ]-TYP) and alternative (CMJ-ALT) CMJ variables. Seven (4 men and 3 women) elite (Olympic-level) SBX athletes participated in study I, and 5 of the same athletes (2 men and 3 women) participated in study II. Countermovement jump variables relating to force, velocity, power, and time were measured during both eccentric and concentric jump phases, with CMJ-TYP variables reflecting CMJ output and CMJ-ALT variables reflecting CMJ mechanics. In study I, CMJ performance was assessed before and after a fatiguing lower-body exercise protocol, and in study II, CMJ performance was examined before and after a 19-week structured training block. Meaningful differences in CMJ performance were examined using the magnitude of change (effect sizes [ES]) for group and individual changes. Acute fatigue decreased peak force and eccentric function, while the duration of the jump increased. The structured training block increased peak force and eccentric function, while jump duration markedly decreased. In both study I and study II, the largest ES were associated with CMJ-ALT variables. The CMJ test seems a suitable monitoring tool in elite SBX athletes for the detection of both acute fatigue and training-adaptation. Compared with CMJ output, CMJ mechanics exhibits more marked and divergent changes after both acute NM fatigue and a structured training block. CMJ-ALT variables should therefore be incorporated into CMJ analysis.
机译：通过典型（反向运动跳跃[CMJ] -TYP）和替代方法（CMJ），对精英滑雪板交叉（SBX）运动员响应急性神经肌肉（NM）疲劳（研究I）和慢性训练（研究II）的反向运动跳跃性能进行了检查-ALT）CMJ变量。七名（4名男性和3名女性）精英（奥运会级别）SBX运动员参加了研究I，而其中5名相同的运动员（2名男性和3名女性）参加了研究II。在偏心和同心跳阶段都测量了与力，速度，功率和时间有关的反向运动跳跃变量，其中CMJ-TYP变量反映了CMJ输出，而CMJ-ALT变量反映了CMJ力学。在研究I中，在进行令人疲劳的下半身运动方案前后评估CMJ的表现，在研究II中，对19周结构化训练前后的CMJ表现进行检查。使用组和个人更改的更改幅度（效果大小[ES]）检查CMJ性能的有意义差异。急性疲劳会降低峰值力量和偏心功能，而跳跃的持续时间会增加。结构化的训练块增加了峰值力量和偏心功能，而跳跃时间却明显减少。在研究I和研究II中，最大的ES与CMJ-ALT变量相关。 CMJ测试似乎是精英SBX运动员的一种合适的监测工具，可用于检测急性疲劳和训练适应性。与CMJ输出相比，在急性NM疲劳和结构化训练障碍后，CMJ力学表现出更加明显和发散的变化。因此，CMJ-ALT变量应纳入CMJ分析中。

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