Effect of a high intensity quadriceps fatigue protocol on knee joint mechanics and muscle activation during gait in young adults
Effect of a high intensity quadriceps fatigue protocol on knee joint mechanics and muscle activation during gait in young adults
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DOI：
10.1007/s00421-011-1990-4
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发表时间：
2012-02-01
影响因子：
3
通讯作者：
Hubley-Kozey, Cheryl L.
中科院分区：
文献类型：
--
作者：
Murdock, Gillian Hatfield;Hubley-Kozey, Cheryl L.
本研究旨在探讨股四头肌功能受损对膝关节生物力学和步态神经肌肉功能的影响。采集了20名健康成年人完成高强度股四头肌疲劳实验前后步态的表面肌电、三维运动和地面反作用力。模式识别技术被用来检查所有步态变量的幅度和时间特性的变化。疲劳方案导致20名参与者中18名的膝伸肌扭矩产生和股四头肌中值功率频率降低（p < 0.05）。对这18名参与者的步态数据进行了分析。膝关节外旋角增加（p < 0.05），净外屈和外旋力矩减少（p < 0.05），净外收力矩增加（p < 0.05）。疲劳后关节周围肌肉激活模式的变化与生物力学变化一致，但没有显着改变。即使对于这种低需求的行走任务，膝关节运动和负载特性也在高强度疲劳方案之后以可能使膝关节处于关节病理学和损伤的更大风险的方式改变。
The purpose of this study was to determine the eVect of impaired quadriceps function on knee joint biomechanics and neuromuscular function during gait. Surface electromyograms, three-dimensional motion and ground reaction forces were collected during gait before and after 20 healthy adults completed a high intensity quadriceps fatigue protocol. Pattern recognition techniques were utilized to examine changes in amplitude and temporal characteristics of all gait variables. The fatigue protocol resulted in decreased knee extensor torque generation and quadriceps median power frequencies for 18 of 20 participants (p < 0.05). The gait data from these 18 participants was analyzed. The knee external rotation angle increased (p < 0.05), the net external flexion and external rotation moments decreased (p < 0.05), and the net external adduction moment increased (p < 0.05). Post-fatigue changes in periarticular muscle activation patterns were consistent with the biomechanical changes, but were not significantly altered. Even for this low demand task of walking the knee motion and loading characteristics were altered following a high intensity fatigue protocol in a manner that may place the knee joint at greater risk for joint pathology and injury.