Surface electromyography of lower limb muscles in healthy middle-aged and old women during stair ascent and descent

Dan LI; Jianxiong Wang; Maomao Huang; Fangyuan XU; Qiu Zeng; Jiyang LI; Yang LI; Cuihong Xia; Yadan Zheng; Zhangyu XU; Wenfeng Fang; Tenggang Wan

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Surface electromyography of lower limb muscles in healthy middle-aged and old women during stair ascent and descent

VernacularTitle:健康中老年女性上下楼梯时下肢肌肉的表面肌电图表现
Author: Dan LI ¹ ; Jianxiong WANG ¹ ; Maomao HUANG ¹ ; Fangyuan XU ¹ ; Qiu ZENG ¹ ; Jiyang LI ¹ ; Yang LI ¹ ; Cuihong XIA ¹ ; Yadan ZHENG ¹ ; Zhangyu XU ¹ ; Wenfeng FANG ¹ ; Tenggang WAN ¹
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1. Department of Rehabilitation Medicine, the Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
Publication Type:Journal Article
Keywords: stair climbing; quadriceps; hamstring; surface electromyography
From: Chinese Journal of Rehabilitation Theory and Practice 2023;29(6):731-737
CountryChina
Language:Chinese
Abstract: ObjectiveTo observe the lower limb muscle activation strategy of healthy middle-aged and old women during stair ascent and descent with surface electromyography. MethodsFrom August, 2021 to February, 2022, 20 healthy middle-aged and old women were measured the surface electromyography root mean square (RMS) and integrated electromyography (iEMG) of bilateral vastus lateral, rectus femoris, vastus medialis, biceps femoris and semitendinosus during stair ascent and descent, and co-contraction ratio was calculated. ResultsDuring stair ascent, the RMS of bilateral vastus lateral, rectus femoris and vastus medialis was higher at starting stage than at following stage (|t| > 6.650, P < 0.001), while the RMS of biceps femoris and semitendinosus was lower (t > 3.559, P < 0.01); and the co-contraction ratio of hamstrings/quadriceps was lower at starting stage than at following stage (t > 8.185, P < 0.001). During stair descent, the RMS of bilateral vastus lateral, vastus medialis, biceps femoris and semitendinosus was higher at following stage than at starting stage (t > 2.345, P < 0.05), as well as the co-contraction ratio of hamstrings/quadriceps (t > 2.405, P < 0.05). ConclusionThe activities of the muscles around the knees are almost symmetrical during stair ascent and descent for healthy middle-aged and old women. The activation and co-contraction ratio of quadriceps and hamstring are various at starting/following stages.