Grip Strength in Different Elbow and Forearm Positions

不同手肘及前臂位置下的握力

湯佩芳(Pei-Fang Tang) ； 吳英黛(Ying-Tai Wu)

《中華民國物理治療學會雜誌》 14卷 (1989/10) Pp. 41-48

https://doi.org/10.29616/JPTAROC.198910.0006

摘要

本研究的目的在探討六種不同的手肘及前臂位置下握力的變化情形。這六種位置分別是肘部彎曲90度時前臂內翻90度、前臂在正中位置、及前臂外翻90度；和肘部伸直時前臂內翻90度、前臂在正中位置，及前臂外翻90度。
共有60位年輕男、女性參加本實驗。我們採用校正過的Jamar握力器測試握力，同時用肌電迴饋儀記錄用力緊握時肱二頭肌表面積分肌電位的電位變化。
二因子變異數分析的結果顯示無論是手肘或前臂姿勢的改變均會影響握力值，而且此二因子之間有交互作用效果存在。進一步的多重比較結果發現在手肘彎曲90度加上前臂內翻90度時的握力明顯地小於其他五組的握力；而其他五個姿勢下的握力差異並無統計上的意義。將男、女性資料分別分析的結果也呈現如同上述的發現。
以肱二頭肌肌電位變化作為共變量來對此六種位置下握力的共變數分析發現其迴歸係數為0.37，且在P值為0.001時具有統計上的意義。此結果表示其他的生物機械因素可能較手肘或前臂姿勢的改變更能解釋握力差異的變量。

並列摘要

The purpose of this study was to test for differences in the grip strength among the six different combinations of elbow and forearm positions. The dominant hand of sixty normal subjects was tested for maximal grip strength in elbow flexion at 90 degrees with forearm in pronation, midposition, and supination and elbow at full extension with forearm in pronation, midposition, and supination. The six positions were randomized and the grip strength was measured by Jamar Dynamometer. Surface EMG of the biceps brachii of the dominant upper extremity was recorded simultaneously during grip testing. The result of two-way analysis of variance (ANOVA) revealed that elbow or forearm position could significantly change grip strength (p＜0.001). There was also significant interaction between elbow and forearm position (p＜0.05). Further post hoc test with Student-Newman-Keuls multiple comparison showed that grip strength in the position of elbow flexion at 90 degrees with forearm pronation was significantly lower than those in the same elbow position with other forearm position and those in the same forearm position with other elbow position. It appeared to be similar results if we analyzed the male and female data separately. Furthermore, the regression coefficient between grip strength and integrated EMG of biceps brachii in the six positions is only 0.37 at 0.001 significant level. It suggested that the reasons for differences of grip strength in different elbow-forearm positions might mainly be other biomechanical factors.

並列關鍵字

Grip strength ； Elbow position ； Forearm position ； EMG of biceps