目的：量化分析肩肘关节协同施力所表现出的特征。方法利用测量平台的三维力传感器，分别记录1名健康男性受试者在肩部与肘部进行独立运动时，前臂与上臂的横向力。受试者以最大横向力的100%、75%、50%、25%分别完成肩外展、肩内收、肘屈曲、肘伸展4个动作，用主动动作力与连带动作力之比作为前臂和上臂协同程度的评价指数。结果肩外展时，主动运动力越低，评价指数越低，运动越不好控制；肩内收时，主动动作力下降对评价指数无明显影响；肘伸展时，主动运动力下降，评价指数上升；相对其他动作，肘屈曲时，评价指数变化不规律，提示较难控制协同运动的方向及大小。结论人体对上臂的控制难于前臂。%Objective To quantize the synergistic force in movement of upper limbs between shoulders and elbows. Methods The trans-verse forces of elbows and shoulders during movement were recorded in a healthy adult with an upper-limb-force-measuring plate form which comprised of 2 three-dimensional force sensors, respectively. Then he performed shoulder abduction/adduction and elbow extension/flexion at 100%, 75%, 50%and 25%of the maximum contraction force, respectively. The ratio of the active action force and the joint action force (named assessment index) was used to assess the synergistic degree of the forearm and the upper arm. Results In the shoulder abduc-tion motion, the assessment index decreased as the strength of active action decreased, meant interference of joint action increased. Howev-er, it was almost stable in the shoulder adduction, increased in the elbow extensionas, and was irregular in the elbow flexion, as the active ac-tion strength decreased, respectively. Conclusion It may be more difficult to control upper arm than the forearm.
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