Gender differences in knee angle when landing from a drop-jump.
Gender differences in knee angle when landing from a drop-jump.
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跳伞落地时膝盖角度的性别差异。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
E. Wojtys
中科院分区：
文献类型：
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作者：
L. Huston;B. Vibert;J. Ashton;E. Wojtys
20名（10名男性和10名女性）健康、身高匹配的患者（平均患者年龄：28+/-5岁）参加了一项研究，该研究检验了（零）假设，即在跌落着陆冲击时膝关节屈曲角度没有显著的性别差异。患者从三个垂直高度（20、40和60 cm）进行三次无约束跳跃到混凝土地板上。将反射标记放置在身体右侧的六个部位：第五跖骨头、外踝、股骨外侧髁、大转子、髂后上棘和髂前上棘。然后使用二维运动分析系统在120 Hz下测量踝关节、膝关节和髋关节在矢状面中的角度。在着地过程中，膝关节屈曲角度存在显著的性别差异（P<0.05）。当从60 cm的高度着陆时，膝关节角度的性别差异最大：男性以16度膝关节屈曲着陆，而女性以7度的膝关节屈曲角度着陆（P<0.05）。从中等跳跃高度（40 cm）着陆时，也发现了类似的性别差异。在这个样本中，女性的膝盖比年龄和身高相匹配的男性更直。
Twenty (10 men and 10 women) healthy, height-matched patients (mean patient age: 28+/-5 years) participated in a study testing the (null) hypothesis that no significant gender differences would be found in the knee flexion angle upon impact from a drop-landing. Patients performed three unconstrained jumps from three vertical heights (20, 40, and 60 cm) onto a concrete floor. Reflective markers were placed on the right side of the body at six sites: the head of the fifth metatarsal, the lateral malleolus, the lateral femoral condyle, the greater trochanter, the posterosuperior iliac spine, and the anterosuperior iliac spine. Ankle, knee, and hip angles in the sagittal plane were then measured at 120 Hz using a two-dimensional motion analysis system. Significant gender differences in knee flexion angles were found at ground impact during the drop-landing (P<.05). The largest gender difference in knee angle occurred when landing from a height of 60 cm: men landed with 16 degrees of knee flexion, whereas women landed with a significantly straighter knee flexion angle of 7 degrees (P<.05). A similar gender difference was found when landing from the medium jump height (40 cm). In this sample, women landed with a straighter knee than did age- and height-matched men.