Nyland J A, Shapiro R, Caborn D N, Nitz A J, Malone T R
University of Kentucky, Sports Medicine Center, Lexington 40536, USA.
J Orthop Sports Phys Ther. 1997 Mar;25(3):171-84. doi: 10.2519/jospt.1997.25.3.171.
This study attempted to determine the effect of eccentric quadriceps femoris, hamstring, and placebo fatigue on stance limb dynamics during the plant-and-cut phase of a crossover cut. Twenty female college students (task trained) were tested. Hamstring fatigue resulted in decreased peak impact knee flexion moments (p < or = .01), increased internal tibial rotation at peak knee flexion (p < or = .05), and decreased peak ankle dorisflexion (p < or = .05). Quadriceps fatigue resulted in increased peak ankle dorsiflexion moments (p < .01), decreased peak posterior braking forces (p < or .01), decreased peak knee extension moments (p < or = .01), delayed peak knee flexion (p < or = .01), delayed peak propulsive forces (p < .01), and delayed subtalar peak inversion moments (p < or = .05). Fatigue of either muscle group produced earlier peak ankle plantar flexion moments (p < = .05) and decreased peak propulsive knee flexion moments (p < or = .05). Variables requiring further study (p < or = .1) provide discussion data. Soleus, gastrocnemius, tibialis anterior, and deep posterior compartment calf muscles serve as dynamic impact force attenuators, compensating for fatigued proximal muscles.
本研究试图确定股四头肌、腘绳肌的离心收缩疲劳以及安慰剂疲劳对交叉切步落地和蹬地阶段支撑腿动力学的影响。对20名接受过任务训练的女大学生进行了测试。腘绳肌疲劳导致峰值冲击屈膝力矩降低（p≤0.01），屈膝峰值时胫骨内旋增加（p≤0.05），以及峰值踝背屈降低（p≤0.05）。股四头肌疲劳导致峰值踝背屈力矩增加（p＜0.01），峰值后制动力降低（p＜0.01），峰值伸膝力矩降低（p≤0.01），屈膝峰值延迟（p≤0.01），推进力峰值延迟（p＜0.01），以及距下关节峰值内翻力矩延迟（p≤0.05）。任一肌肉群的疲劳都会使踝跖屈峰值力矩出现得更早（p≤0.05），并使推进屈膝峰值力矩降低（p≤0.05）。需要进一步研究的变量（p≤0.1）提供了讨论数据。比目鱼肌、腓肠肌、胫骨前肌和小腿后深室肌肉作为动态冲击力衰减器，补偿近端疲劳肌肉的作用。
