Department of Orthopaedic Surgery, University of Virginia, 400 Ray C. Hunt Drive, Suite 330, Box 800159, Charlottesville, VA 22908-0159, USA.
J Electromyogr Kinesiol. 2009 Dec;19(6):e458-64. doi: 10.1016/j.jelekin.2008.09.003. Epub 2008 Dec 16.
A relationship exists between lumbar paraspinal muscle fatigue and quadriceps muscle activation. The objective of this study was to determine whether hip and knee joint moments during jogging changed following paraspinal fatiguing exercise. Fifty total subjects (25 with self-reported history of low back pain) performed fatiguing, isometric lumbar extension exercise until a shift in EMG median frequency corresponding to a mild level of muscle fatigue was observed. We compared 3-dimensional external joint moments of the hip and knee during jogging before and after lumbar paraspinal fatigue using a 10-camera motion analysis system. Reduced external knee flexion, knee adduction, knee internal rotation and hip external rotation moments and increased external knee extension moments resulted from repetitive lumbar paraspinal fatiguing exercise. Persons with a self-reported history of LBP had larger knee flexion moments than controls during jogging. Neuromuscular changes in the lower extremity occur while resisting knee and hip joint moments following isolated lumbar paraspinal exercise. Persons with a history of LBP seem to rely more heavily on quadriceps activity while jogging.
腰部竖脊肌疲劳与股四头肌激活之间存在关系。本研究的目的是确定在进行竖脊肌疲劳运动后，慢跑时髋关节和膝关节的力矩是否发生变化。共有 50 名受试者（其中 25 名自述有腰痛病史）进行疲劳的等长腰椎伸展运动，直到肌电图中频的变化表明肌肉疲劳达到轻度水平。我们使用 10 个摄像头运动分析系统比较了腰椎竖脊肌疲劳前后慢跑时髋关节和膝关节的三维外关节力矩。重复的腰椎竖脊肌疲劳运动导致膝关节外展、内旋和髋关节外旋力矩减小，膝关节伸展力矩增大。有腰痛病史的人在慢跑时膝关节屈曲力矩比对照组大。在孤立的腰椎竖脊肌运动后，下肢的神经肌肉会发生变化，以抵抗膝关节和髋关节的力矩。有腰痛病史的人似乎在慢跑时更依赖股四头肌的活动。
