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Influence of Static Stretching Duration on Quadriceps Force Development and Eletromyographic Activity

机译：静态拉伸时间对股四头肌力量发展和肌电描记活动的影响

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Purpose. The purpose of the present study was to analyze the influence of static stretching duration on quadriceps muscle isometric force and electromyographic (EMG) activity of the rectus femoris and vastus lateralis.?Basic procedures. Twenty recreationally-active healthy men were selected for the study. On two separate days, participants took part in two stretching protocols of different durations. Following a specific warmup, participants performed isometric strength assessments of the dominant leg before and after a bout of quadriceps stretching. The stretching protocol consisted of two stretches for the quadriceps muscle for three repetitions of 30 seconds on one visit, and 60 seconds on the other. Main findings. The results revealed a significant reduction in quadriceps muscle mean and peak forces and EMG activity for the rectus femoris with both 30- and 60-second stretching protocols (p ≤ 05). However, EMG activity of the vastus lateralis decreased significantly only in the 60-second protocol (p ≤ 05). Conclusions. Both stretching protocols induced significant decreases in strength and EMG activity, although the stretching duration (60 × 30) did not appear to be a major influencing factor for the current strength reductions. In this perspective, coaches and athletes should avoid flexibility training which consists in stretching repetitions of 30 seconds or longer prior to competitions.
机译：目的。本研究的目的是分析静态拉伸持续时间对股四头肌和股外侧肌的股四头肌等距力和肌电图（EMG）活性的影响。本研究选择了20名具有娱乐活动能力的健康男性。在单独的两天中，参与者参加了两个不同持续时间的伸展运动。在特定的热身之后，参与者在股四头肌伸展运动前后，对优势腿进行了等距力量评估。拉伸方案包括两次股四头肌拉伸，一次重复30秒，另一次重复60秒。主要发现。结果显示，在30秒钟和60秒钟的拉伸方案下，股直肌的股四头肌平均力和峰值力以及EMG活性显着降低（p≤05）。然而，仅在60秒的方案中，股外侧肌的EMG活性才显着下降（p≤05）。结论。两种拉伸方案均导致强度和EMG活性显着降低，尽管拉伸持续时间（60×30）似乎不是当前强度降低的主要影响因素。从这个角度来看，教练和运动员应避免进行柔韧性训练，这应包括在比赛前进行30秒或更长时间的重复训练。

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