Delayed onset of electromyographic activity of vastus medialis obliquus relative to vastus lateralis in subjects with patellofemoral pain syndrome
Delayed onset of electromyographic activity of vastus medialis obliquus relative to vastus lateralis in subjects with patellofemoral pain syndrome
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DOI：
10.1053/apmr.2001.19022
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发表时间：
2001-02-01
影响因子：
4.3
通讯作者：
McConnell, J
中科院分区：
文献类型：
--
作者：
Cowan, SM;Bennell, KL;McConnell, J
目的：研究股骨肌肌电图(EMG)在实施步行功能任务时，股内侧斜肌(VMO)和股外侧肌(VL)是否发生改变。设计：横断面研究。地点：大学实验室。患者：33名PFPS受试者和33名无症状对照。干预：受试者上下一组楼梯-2级，每级20厘米高。VMO和VL的肌电读数分别在台阶上升(向心收缩)和台阶下降(偏心收缩)过程中获得。主要观察指标：在台阶任务中，VMO和VL的表面肌电信号活动开始时的相对差异。结果：在PFPS群体中，在台阶任务的上升和下降阶段，VL的EMG起始时间均早于VMO(p<；.05)。相反，控制组的VMO和VL在任一任务阶段的肌电活动起始点都没有这样的差异。结论：这一发现支持了血管肌群和PFPS的活动时间变化之间的假设关系。这一发现为支持PFP管理中常用的物理治疗提供了理论基础。
Objective: To determine whether electromyographic (EMG) onsets of vastus medialis obliquus (VMO) and vastus lateralis (VL) are altered in the presence of patellofemoral pain syndrome (PFPS) during the functional task of stair stepping.Design: Cross-sectional.Setting: University laboratory.Patients: Thirty-three subjects with PFPS and 33 asymptomatic controls.Interventions: Subjects ascended and descended a set of stairs-2 steps, each 20-cm high-at usual stair-stepping pace. EMG readings of VMO and VL taken on middle stair during step up (concentric contraction) and step down (eccentric contraction).Main Outcome Measures: Relative difference in onset of surface EMG activity of VMO compared with VL during a stair-stepping task. EMG onsets were determined by using a computer algorithm and were verified visually.Results: In the PFPS population, the EMG onset of VL occurred before that of VMO in both the step up and step down phases of the stair-stepping task (p < .05). In contrast, no such differences occurred in the onsets of EMG activity of VMO and VL in either phase of the task for the control subjects.Conclusion: This finding supports the hypothesized relationship between changes in the timings of activity of the vastimuscles and PFPS. This finding provides theoretical rationale to support physiotherapy treatment commonly used in the management of PFPs.