Lessi Giovanna Camparis, Dos Santos Ana Flávia, Batista Luis Fylipe, de Oliveira Gabriela Clemente, Serrão Fábio Viadanna
Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil.
Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil.
J Electromyogr Kinesiol. 2017 Feb;32:9-14. doi: 10.1016/j.jelekin.2016.11.001. Epub 2016 Nov 9.
Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing.
The participants included forty healthy subjects. We performed kinematic analysis of the trunk, pelvis, hip and knee and muscle activation analysis of the gluteal muscles, vastus lateralis and biceps femoris, during a single-leg landing before and after fatigue.
Men had greater trunk flexion than women after fatigue. After fatigue, a decrease in peak knee flexion and an increase in Gmax and BF activation were observed.
The increase in the trunk flexion can decrease the anterior tibiofemoral shear force resulted from the lower knee flexion angle, thereby decreasing the stress on the ACL.
肌肉疲劳与可能导致前交叉韧带（ACL）损伤的生物力学变化有关。躯干和骨盆运动学的改变也可能与ACL损伤有关。尽管一些研究比较了肌肉疲劳对男性和女性下肢运动学的影响，但对其对骨盆和躯干运动学的影响知之甚少。本研究的目的是比较疲劳对男性和女性在着陆过程中下肢、骨盆和躯干运动学以及肌肉激活的影响。
参与者包括40名健康受试者。我们在疲劳前后的单腿着陆过程中，对躯干、骨盆、髋部和膝盖进行了运动学分析，并对臀肌、股外侧肌和股二头肌进行了肌肉激活分析。
疲劳后男性的躯干屈曲大于女性。疲劳后，观察到膝关节屈曲峰值降低，臀大肌（Gmax）和股二头肌（BF）激活增加。
躯干屈曲的增加可降低因膝关节屈曲角度较小而产生的胫股前向剪切力，从而降低ACL上的应力。
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