Gender comparison of hip muscle activity during single-leg landing
Gender comparison of hip muscle activity during single-leg landing
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DOI：
10.2519/jospt.2005.35.5.292
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发表时间：
2005-05-01
影响因子：
6.1
通讯作者：
Hewett, TE
中科院分区：
文献类型：
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作者：
Zazulak, BT;Ponce, PL;Hewett, TE
研究设计：对照实验室研究：目的：确定单腿着地时臀部稳定肌的肌电图（EMG）活动是否存在性别差异。背景：许多因素可以解释女性运动员前交叉韧带（ACL）损伤发生率较高的原因。然而，在动态events.Methods和措施：22个司我大学生运动员（13名女性，9名男性）进行下降降落从30.5和45.8厘米的高度在臀部肌肉活动的性别差异还没有得到很好的表征。表面肌电图被用来检查相对的肌肉活动，从200毫秒前的初始接触到250毫秒后接触。每块肌肉的峰值和平均值采用2x2结果：女性臀大肌峰值较低，（平均SD，69.5 +/- 30.2 vs 98.0 +/-33.4%最大自主收缩%MVIC]; P = 0.019）和平均（平均值+/- SD，37.5 +/- 15.6 vs 53.9 +/-18.0%MVIC; P = 0.018）在着陆后接触阶段的肌肉激活高于男性。此外，在接触前阶段，女性表现出更高的股直肌峰值活动（平均值± SD，33.6 ± 18.5 vs 18.7 ± 8.2%MVIC; P = 0.029）。
Study Design: Controlled laboratory study.Objectives: To determine whether gender differences in electromyographic (EMG) activity of hip-stabilizing muscles are present during single-leg landing. Background: Numerous factors may explain the greater rate of anterior cruciate ligament (ACL) injuries in female athletes. However, gender differences in hip muscle activity during dynamic events have not been well characterized.Methods and Measures: Twenty-two Division I collegiate athletes (13 female, 9 male) performed drop landings from 30.5- and 45.8-cm heights. Surface EMG was used to examine relative muscle activity from 200 milliseconds prior to initial contact to 250 milliseconds postcontact. Peak and mean values for each muscle (gluteus maximus, gluteus medius, rectus femoris) in each time epoch were analyzed using 2 x 2 (group by height) analyses of variance (ANOVAs) to determine significance.Results: Females demonstrated lower gluteus maximus peak (mean SD, 69.5 +/- 30.2 versus 98.0 +/- 33.4 percent maximum voluntary contraction %MVIC]; P =.019) and mean (mean +/- SD, 37.5 +/- 15.6 versus 53.9 +/- 18.0 %MVIC; P = .018) muscle activation during the postcontact phase of landing than males. Furthermore, females demonstrated greater peak rectus femoris activity during the precontact phase (mean +/- SD, 33.6 +/- 18.5 versus 18.7 +/- 8.2 %MVIC; P = .029), A positive effect of drop height on relative activity of all muscles was observed during both phases (P