【摘要】 背景:三维运动检测加表面肌电分析不仅能定量客观地分析上肢运动功能,对探讨影响上肢运动功能的因素和机制也有重要作用。目的:分析运动速度和目标位置对上肢伸手触碰运动的运动学及肌肉活动的影响。方法:12名正常年轻人用右手分别以正常速度和最大速度触碰对侧、中间、同侧3个不同位置的铃铛,采用英国Vicon三维运动分析系统和Noraxon公司的无线肌电图机同步采集运动学及肌电数据。结果与结论:(1)快速运动时轨迹比小于常速运动(P<0.001),平均速度、最大速度、峰值时间百分比大于常速运动(P<0.001);(2)三角肌后部、肱二头肌、肱三头肌肌肉收缩比常速运动时增强(P<0.001);同侧伸手运动中,三角肌前部肌肉收缩水平低于伸向对侧(P=0.001)和中间(P<0.001),三角肌后部肌肉收缩水平高于伸向对侧时(P=0.019),肱二头肌(P=0.039)和肱三头肌(P<0.001)肌肉收缩水平高于伸向中间。(3)结果说明,快速运动可以更好地激活肌肉,且运动速度加快、轨迹变直,运动质量提高;同侧运动对三角肌后部、肘关节肌肉的激活增大,而对侧运动更多地激活三角肌前部,不同目标位置,肌肉激活模式不同。更多还原

【Abstract】 BACKGROUND: Three-dimensional(3D) motion analysis system combined with electromyograph cannot only objectively analyze movement function of the upper limb, but also exert an important role in exploring the exercise-related factors and the underlying mechanism. OBJECTIVE: To explore the influence of movement velocity and target location on kinematics and muscle activity in upper limb reaching. METHODS: Twelve healthy young adults reached for three different location targets(frontal, ipsilateral and contralateral) at self-selected and fast speeds to with the dominant right hand, respectively. Kinematic parameters and muscle activity were recorded by Vicon 3D motion analysis system and Noraxon wireless electromyograph, synchronously. RESULTS AND CONCLUSION: Reach path ratio became smaller when moving faster(P < 0.001), while mean velocity, peak velocity and the time percentage of peak velocity increased(P < 0.001). Posterior deltoid, biceps brachii and triceps brachii activation was higher during fast speed movement(P < 0.001). Muscle activation of anterior deltoid was lower in ipsitralateral reaching than contralateral(P=0.001) and frontal reaching(P < 0.001), and posterior deltoid was higher than contralateral reaching(P=0.019). Biceps brachii(P=0.039) and triceps brachii(P < 0.001) activation was also higher in ipsitralateral reaching than frontal reaching. These results suggest that moving fast can contribute to more muscle activation, high velocity, smooth trajectory and increased movement quality. Posterior deltoid, elbow extension and flexion muscle activation are high in ipsitralateral reaching, while high anterior deltoid activation in contralateral reaching; therefore, target location result in muscle synergies.更多还原