The Comparison of Muscle Contraction Time and Modulation Ratio during Reaching Tasks in Hemiparalysis, Elderly and Young Adults

• 영문명: The Comparison of Muscle Contraction Time and Modulation Ratio during Reaching Tasks in Hemiparalysis, Elderly and Young Adults
• 발행기관: 물리치료재활과학회
• 저자명: Jeon Sun 박대성(Dae-Sung Park)
• 간행물 정보: 『Physical Therapy Rehabilitation Science』제11권 제2호, 145~153쪽, 전체 9쪽
• 주제분류: 의약학 > 재활의학
• 파일형태: PDF
• 발행일자: 2022.06.30

영문 초록

Objective: The purpose of this study was to evaluate the Electromyography (EMG) of the upper limb during reaching tasks according to two heights in the sitting position. Design: Cross sectional designMethods: Fifteen hemiplegia, fifteen elderly, and fifteen healthy subjects have participated in this study. The targets (90% length of the subject’s arm) were located at the two heights (the eye and xiphoid process). We have recorded EMG signals of seven upper limb muscles (anterior deltoid (AD), posterior deltoid (PD), pectoralis major (Pec), infraspinatus (Inf), supraspinatus (Sup), biceps brachii (Bi), triceps brachii (Tri)). The dependent variables were movement time(s), modulation ratio, working ratio, and the co-contraction ratio of the hemiplegia, elderly, and healthy at the reaching task. Two-way repeated-measures ANOVA (2-heights) was analyzed with the LSD post hoc test. Results: The study results were as follows: (1) The movement time to the target during reaching movement was significantly longer for the hemiplegia and elderly groups compared to the healthy group. (3) The modulation rate was significantly higher at eye height than the xiphoid height in AD, PD, Pec, Inf, Bi muscles, and the hemiplegia group and elderly group were significantly lower than the healthy group. Additionally, the modulation ratio showed a significant interaction between heights and groups. Conclusions: It is expected that the variables using the muscle contraction characteristics, the evaluation method of this study, can be used as an electromyography-based feedback method that can be objectively evaluated and quantified in clinical practice.

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키워드

Activities of daily living Hemiplegia Aged Electromyography Electrodiagnosis