Division of Intelligent and Biomechanical System, State Key Laboratory of Tribology, Tsinghua University, Haidian, Beijing, China.
National Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Center, Haidian, Beijing, China.
J Healthc Eng. 2018 Feb 11;2018:1817485. doi: 10.1155/2018/1817485. eCollection 2018.
Patients with hemiplegia usually have weak muscle selectivity and usually perform strength at a secondary joint (secondary strength) during performing a strength at one joint (primary strength). The abnormal strength pattern between shoulder and elbow joint has been analyzed by the maximum value while the performing process with strength changing from 0 to maximum then to 0 was a dynamic process. The objective of this study was to develop a method to dynamically analyze the strength changing process. Ten patients were asked to perform four group asks (maximum and 50% maximum voluntary strength in shoulder abduction, shoulder adduction, elbow flexion, and elbow extension). Strength and activities from seven muscles were measured. The changes of secondary strength had significant correlation with those of primary strength in all tasks ( > 0.76, < 0.01). The antagonistic muscles were moderately influenced by the primary strength ( > 0.4, < 0.01). Deltoid muscles, biceps brachii, triceps brachii, and brachioradialis had significant influences on the abnormal strength pattern (all < 0.01). The dynamic method was proved to be efficient to analyze the different influences of muscles on the abnormal strength pattern. The muscles, deltoid muscles, biceps brachii, triceps brachii, and brachioradialis, much influenced the stereotyped movement pattern between shoulder and elbow joint.
偏瘫患者在进行单关节力量训练时，通常会出现肌肉选择性较弱的情况，力量容易转移至次要关节（次优力量）。在进行力量训练时，肩肘关节之间的异常力量模式已经通过最大值进行了分析，而力量从 0 逐渐增加到最大值，然后再减至 0 的过程是一个动态的过程。本研究的目的是开发一种动态分析力量变化过程的方法。要求 10 名患者完成 4 组测试（肩外展和肩内收的最大和 50%最大自主力量，以及肘屈和肘伸的最大和 50%最大自主力量）。测量了来自 7 块肌肉的力量和活动。在所有任务中，次优力量的变化与最优力量的变化具有显著相关性（>0.76，<0.01）。拮抗肌受最优力量的中度影响（>0.4，<0.01）。三角肌、肱二头肌、肱三头肌和肱桡肌对异常力量模式有显著影响（均<0.01）。动态方法被证明是分析肌肉对异常力量模式的不同影响的有效方法。三角肌、肱二头肌、肱三头肌和肱桡肌对肩肘关节之间刻板运动模式的影响较大。
