TY - JOUR
T1 - Vastus medialis oblique and vastus lateralis activity during a double-leg semisquat with or without hip adduction in patients with patellofemoral pain syndrome
AU - Miao, Ping
AU - Xu, Yi
AU - Pan, Cuihuan
AU - Liu, Hao
AU - Wang, Chuhuai
N1 - Funding Information:
The authors would like to thank all participating subjects, as well as the co-investigators, and colleagues who made this trial possible. No financial support was provided for this study from any source.
Publisher Copyright:
© 2015 Miao et al.
PY - 2015/10/12
Y1 - 2015/10/12
N2 - Background: The purpose was to investigate the effect of double-leg semisquat with hip adduction on the activation of vastus medialis oblique (VMO) and vastus lateralis (VL) in patients with patellofemoral pain syndrome (PFPS). Methods: Thirty patients with PFPS were designated to the study group, while 30 healthy matched subjects were enrolled in the control group. The activation of VL and VMO was recorded with surface electromyography (EMG) during double-leg semisquat (DS) and double-leg semisquat with hip adduction (DS-HA). The time domain and frequency domain indexes of the electromyography data were collected for analysis. Results: In the study group, the time domain indexes (RMS, IEMG) and frequency domain index (MPF) of VL were significant higher than VMO in the test of DS (P∈<∈0.05); and the time domain of VMO was significantly higher in the test of DS-HA when compared to DS (P∈<∈0.05) while there was no difference in the activation of VL. Conclusions: In the study group, an increase in activity of the VMO was observed through the surface EMG signal in the double-leg semisquat exercise with hip adduction compared to the exercise without hip adduction. This finding indicates that VMO activation can be more selectively obtained through the exercise with hip adduction which can help balance the VL and VMO.
AB - Background: The purpose was to investigate the effect of double-leg semisquat with hip adduction on the activation of vastus medialis oblique (VMO) and vastus lateralis (VL) in patients with patellofemoral pain syndrome (PFPS). Methods: Thirty patients with PFPS were designated to the study group, while 30 healthy matched subjects were enrolled in the control group. The activation of VL and VMO was recorded with surface electromyography (EMG) during double-leg semisquat (DS) and double-leg semisquat with hip adduction (DS-HA). The time domain and frequency domain indexes of the electromyography data were collected for analysis. Results: In the study group, the time domain indexes (RMS, IEMG) and frequency domain index (MPF) of VL were significant higher than VMO in the test of DS (P∈<∈0.05); and the time domain of VMO was significantly higher in the test of DS-HA when compared to DS (P∈<∈0.05) while there was no difference in the activation of VL. Conclusions: In the study group, an increase in activity of the VMO was observed through the surface EMG signal in the double-leg semisquat exercise with hip adduction compared to the exercise without hip adduction. This finding indicates that VMO activation can be more selectively obtained through the exercise with hip adduction which can help balance the VL and VMO.
KW - Hip adduction
KW - Patellofemoral pain syndrome
KW - Surface electromyography
KW - Vastus medialis obliquus
UR - http://www.scopus.com/inward/record.url?scp=84944037661&partnerID=8YFLogxK
U2 - 10.1186/s12891-015-0736-6
DO - 10.1186/s12891-015-0736-6
M3 - Article
C2 - 26459411
AN - SCOPUS:84944037661
SN - 1471-2474
VL - 16
JO - BMC Musculoskeletal Disorders
JF - BMC Musculoskeletal Disorders
IS - 1
M1 - 289
ER -