Influence of knee extension in sitting position with hip adduction on surface EMG of quadriceps muscles in patients with patellofemoral pain syndrome
10.3871/j.1004-7220.2015.03.270
- VernacularTitle:坐位伸膝伴髋内收动作对髌股疼痛综合征患者股四头肌表面肌电信号的影响
- Author:
Ping MIAO
1
;
Chu-huai WANG
2
;
Yi XU
2
;
Kang-ling WANG
3
Author Information
1. Department of Rehabilitation Medicine, the Second Affiliated Hospital of Guangzhou Medical University
2. Department of Rehabilitation Medicine, Huangpu Divisions, the First Affiliated Hospital of Sun Yat-Sen University
3. Department of Rehabilitation Medicine, Zhujiang Hospital of Southern Medical University
- Publication Type:Journal Article
- Keywords:
Patellofemoral pain syndrome (PFPS);
Vastus medialis obliquus (VMO);
Hip adduction;
Surface electromyography (sEMG)
- From:
Journal of Medical Biomechanics
2015;30(3):E270-E274
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the possible effect of fully knee extension in sitting position with or without hip adduction on quadriceps imbalance in patients with patellofemoral pain syndrome (PFPS) by using surface electromyography (sEMG). Methods sEMG signals of vastus lateralis (VL) and vastus medialis oblique (VMO) muscles from 30 patients with PFPS as PFPS group and 30 healthy subjects as control group were collected, during their fully knee extension in sitting position with or without hip adduction. All the EMG data were then analyzed by extracting time domain indexes, namely, the root mean square (RMS) and integrated EMG (IEMG), to compare the balanced relationship between VL and VMO muscles. Results In PFPS group, there were no significant differences in VL time domain indexes during knee extension in sitting position with or without hip adduction, while statistical differences were found in VMO time domain indexes, and values of RMS and IEMG of VMO were higher under hip adduction, which indicated that the VMO muscle recruitment was strengthened. Conclusions Fully knee extension in sitting position with hip adduction can promote EMG activities of VMO muscles in patients with PFPS, which will help to balance the VL and VMO muscles.
