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首页> 外文期刊>Scandinavian journal of medicine & science in sports. >Intra‐subject variability in muscle activity and co‐contraction during jumps and landings in children and adults
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Intra‐subject variability in muscle activity and co‐contraction during jumps and landings in children and adults

机译：在儿童和成人的跳跃和着陆期间肌肉活动的主题和共造成的内部变异性

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摘要

We investigated muscle activity, intra‐subject variability in muscle activity and co‐contraction during vertical jumps and landings in children and adults. Ten male children and 10 male adults completed 10 countermovement jumps ( CMJ ), 10 drop jumps ( DJ ) from 30?cm, 10 low and high landings from 30 and 60?cm for the children and 60 and 90?cm for the adults. The adults also performed ten DJ from 60?cm. EMG was recorded from nine lower limb muscles in the right leg and normalized to isometric MVC . Statistical parametric mapping was used to reveal differences in the muscle activity and intra‐subject variability in the muscle activity. Co‐contraction was quantified for two thigh muscle pairs and one plantar flexor/dorsiflexor muscle pair and group differences were assessed (two‐way ANOVA ). No significant differences were observed in the less eccentric demanding CMJ while significantly higher muscle activity magnitude and intra‐subject variability were observed for the children during the initial part of the contact phase of DJ and landings, indicating a less consistent muscle activity pattern in the children. This may indicate that vertical jumps/landings involving a high amount of eccentric muscle contraction constrain the muscle activation in children, possibly because of immature motor control.
机译：我们调查了肌肉活动，肌肉活动内的内部变异，在垂直跳跃和儿童和成人的着陆期间共收缩。十个雄性儿童和10名男性成人完成了10个对手跳跃（CMJ），10次滴跳（DJ）从30？CM，10个低和高的着陆，为儿童和60厘米和90厘米，为成年人。成年人还从60？cm表现为10 dj。 EMG从右腿九个下肢肌肉记录并标准化为等距MVC。统计参数映射用于揭示肌肉活动中肌肉活动和对象内变异性的差异。为两个大腿肌对量化，并评估一个跖屈/背鳍肌肉对（双向ANOVA）进行分析。在较低的偏心苛刻的CMJ中没有观察到显着差异，而在DJ和着陆的接触阶段的初始部分期间，儿童观察到肌肉活动幅度和对象内可变异，表明儿童中较不一致的肌肉活动模式。这可能表明垂直跳跃/着陆涉及大量偏心肌收缩限制儿童的肌肉激活，可能是因为由于未成熟的电动机控制。

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