Ng G Y F, Zhang A Q, Li C K
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
J Electromyogr Kinesiol. 2008 Feb;18(1):128-33. doi: 10.1016/j.jelekin.2006.08.010. Epub 2006 Oct 27.
Patellofemoral pain syndrome (PFPS) is usually due to weakness of vastus medialis obliquus (VMO) resulting in abnormal patellar tracking. One of the objectives of rehabilitation is to strengthen the VMO so as to counterbalance the vastus lateralis (VL) action during normal activities. This study compared the effects of an 8-week exercise program with and without EMG biofeedback on the relative activations of VMO and VL. Twenty-six subjects with PFPS were randomly allocated into an "exercise" group (Group 1) and a "biofeedback+exercise" group (Group 2). Both groups performed the same exercise program but subjects in Group 2 received real time EMG biofeedback information on the relative activations of VMO and VL during the exercises. After 8 weeks of training, Group 1 had insignificant changes in their VMO/VL EMG ratio (p=0.355), whereas Group 2 had significantly greater VMO/VL EMG ratio (p=0.017) when performing normal activities throughout a 6-h assessment period. The present result reveals that the incorporation of an EMG biofeedback into a physiotherapy exercise program could facilitate the activation of VMO muscle such that the muscle could be preferentially recruited during daily activities.
髌股疼痛综合征（PFPS）通常是由于股内侧斜肌（VMO）无力导致髌骨轨迹异常。康复的目标之一是增强VMO，以便在正常活动中抵消股外侧肌（VL）的作用。本研究比较了为期8周的有肌电图生物反馈和无肌电图生物反馈的锻炼计划对VMO和VL相对激活的影响。26名PFPS患者被随机分为“锻炼”组（第1组）和“生物反馈+锻炼”组（第2组）。两组都进行相同的锻炼计划，但第2组的受试者在锻炼过程中会收到关于VMO和VL相对激活的实时肌电图生物反馈信息。经过8周的训练，在为期6小时的评估期内进行正常活动时，第1组的VMO/VL肌电图比值变化不显著（p=0.355），而第2组的VMO/VL肌电图比值显著更高（p=0.017）。目前的结果表明，在物理治疗锻炼计划中加入肌电图生物反馈可以促进VMO肌肉的激活，从而使该肌肉在日常活动中被优先募集。
