Surface Electromyography Changes of Vastus Medialis, Rectus Femoris and Vastus Lateralis during Stair Descent in Healthy Youth

VernacularTitle:健康青年下台阶时股内侧肌、股直肌和股外侧肌间的表面肌电变化
Author: nan Hao SHI ¹ ; jun Pei GUI ; wei Da XU ; Hui GUO ; Ying XIE
Author Information

1. 首都医科大学附属北京友谊医院
Publication Type:Journal Article
Keywords: stair descent; quadriceps; contraction intensity; surface electromyography
From: Chinese Journal of Rehabilitation Theory and Practice 2017;23(10):1162-1165
CountryChina
Language:Chinese
Abstract: Objective To evaluate the activities of vastus medialis, rectus femoris and vastus lateralis during stair descent in healthy youth. Methods Thirty healthy college students were recruited from the Capital Medical University 2015 admissions in 2016. The electrode was put on the dominant side of the quadriceps. Surface electromyography was used to record muscle activity during stair descent. Results During stair descent, the maximum amplitude and mean amplitude were significantly lower in rectus femoris than in vastus medialis and vas-tus lateralis (P<0.001). No significant difference was found between vastus medialis and vastus lateralis (P>0.05). Conclusion The activa-tion of both vastus medialis and vastus lateralis during stair descent is significantly higher than that of rectus femoris. The coactivation of vastus medialis and vastus lateralis is equal in healthy youth.