Gender and fatigue have influence on knee joint control strategies during landing
Gender and fatigue have influence on knee joint control strategies during landing
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DOI：
10.1016/j.clinbiomech.2008.07.005
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发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Gollhofer, Albert
中科院分区：
文献类型：
--
作者：
Gehring, Dominic;Melnyk, Mark;Gollhofer, Albert
背景：性别和疲劳被认为会影响前交叉韧带损伤的风险。尽管付出了很多努力，但这些因素对膝关节生物力学的影响仍在讨论中。本研究的目的是研究在着陆任务中，不同性别的人在疲劳状态下膝关节的运动学、动力学和主动肌肉控制策略。方法：13名女性和13名男性在封闭动力链运动方案前后进行两腿着地。评估膝关节运动学和垂直地面反作用力，以及股四头肌、腘绳肌和腓肠肌的肌电图。结果：女性着地时膝关节屈曲速度增加（P < 0.001），膝关节外展角度增加（P < 0.01）。与雄性相比，雌性在着陆准备阶段也表现出不同的肌肉激活模式，如外侧腘绳肌（P < 0.05）和股外侧肌（P < 0.05）的延迟激活。疲劳导致男性和女性的内侧和外侧腘绳肌的预激活减少（P < 0.05和P < 0.001），腓肠肌的预激活减少（P < 0.05）。解释：膝关节屈曲速度、外展角度和肌肉激活的性别差异表明，女性和男性在动态落地运动中具有不同的神经肌肉策略来控制膝关节。这些差异以及由于疲劳导致的腘绳肌和腓肠肌活动的减少，为女性和疲劳状态下不同的膝关节控制提供了证据。(C) 2008 Elsevier Ltd版权所有。
Background: Gender and fatigue are thought to affect the anterior cruciate ligament injury risk. In spite of much effort, the influence of these factors on knee joint biomechanics is still under discussion. The purpose of this study was to investigate kinematics, kinetics, and active muscle control strategies of the knee joint across gender in fatigue conditions during a landing task.Methods: Thirteen females and thirteen males performed two-legged landings before and after a closed kinetic chain exercise protocol. Knee joint kinematics and vertical ground reaction forces were assessed as well as electromyography of the quadriceps, hamstring, and gastrocnemius muscles.Findings: Females landed with increased knee flexion velocities (P < 0.001) and knee joint abduction angles (P < 0.01). Compared to males, females also showed different muscle activation patterns such as a delayed activation of the lateral hamstring (P < 0.05) and the m. vastus lateralis (P < 0.05) during the preparatory phase of the landing. Fatigue led to a reduced pre-activation of the medial and lateral hamstrings (P < 0.05 and P < 0.001) and the gastrocnemius muscle (P < 0.05) both in males and females.Interpretation: The gender differences in knee flexion velocity, abduction angle, and muscle activation suggest that females and males possess different neuromuscular strategies to control the knee joint during dynamic landing movements. These differences as well as decreased hamstring and gastrocnemius muscle activity, due to fatigue, Provide evidence for different knee joint control in females as well as in fatigued conditions. (C) 2008 Elsevier Ltd. All rights reserved.