Macgregor Kerren, Gerlach Sharon, Mellor Rebecca, Hodges Paul W
Division of Physiotherapy, The University of Queensland, Brisbane, Queensland 4072, Australia.
J Orthop Res. 2005 Mar;23(2):351-8. doi: 10.1016/j.orthres.2004.07.006.
Patella taping reduces pain in individuals with patellofemoral pain (PFP), although the mechanism remains unclear. One possibility is that patella taping modifies vasti muscle activity via stimulation of cutaneous afferents. The aim of this study was to investigate the effect of stretching the skin over the patella on vasti muscle activity in people with PFP. Electromyographic activity (EMG) of individual motor units in vastus medialis obliquus (VMO) was recorded via a needle electrode and from surface electrodes placed over VMO and vastus lateralis (VL). A tape was applied to the skin directly over the patella and stretch was applied via the tape in three directions, while subjects maintained a gentle isometric knee extension effort at constant force. Recordings were made from five separate motor units in each direction. Stretch applied to the skin over the patella increased VMO surface EMG and was greatest with lateral stretch. There was no change in VL surface EMG activity. While there was no net increase in motor unit firing rate, it was increased in the majority of motor units during lateral stretch. Application of stretch to the skin over VMO via the tape can increase VMO activity, suggesting that cutaneous stimulation may be one mechanism by which patella taping produces a clinical effect.
髌骨贴扎可减轻髌股关节疼痛（PFP）患者的疼痛，但其机制尚不清楚。一种可能性是髌骨贴扎通过刺激皮肤传入神经来改变股四头肌的活动。本研究的目的是探讨拉伸髌骨上方皮肤对PFP患者股四头肌活动的影响。通过针电极记录股内侧斜肌（VMO）中单个运动单位的肌电图活动（EMG），并从置于VMO和股外侧肌（VL）上方的表面电极记录。将一条胶带直接贴在髌骨上方的皮肤上，并通过胶带在三个方向上施加拉伸，同时受试者在恒定力的作用下保持轻柔的等长伸膝动作。在每个方向上从五个独立的运动单位进行记录。对髌骨上方皮肤施加拉伸可增加VMO表面肌电图，外侧拉伸时增加最为明显。VL表面肌电图活动无变化。虽然运动单位放电率没有净增加，但在外侧拉伸期间大多数运动单位的放电率增加。通过胶带对VMO上方皮肤施加拉伸可增加VMO活动，这表明皮肤刺激可能是髌骨贴扎产生临床效果的一种机制。
