PDF(Pubmed)
Abstract：
The purpose of this study was to examine the changes in muscular activity between the left and right lower legs during gait in healthy children throughout temporal parameters of EMG and symmetry index (SI). A total of 17 healthy children (age: 8.06 ± 1.92 years) participated in this study. Five muscles on both legs were examined via the Vicon 8-camera motion analysis system synchronized with a Trigno EMG Wireless system and a Bertec force plate; onset-offset intervals were analyzed. The highest occurrence frequency of the primary activation modality was found in the stance phase. In the swing phase, onset-offset showed only a few meaningful signs of side asymmetry. The knee flexors demonstrated significant differences between the sides (p < 0.05) in terms of onset-offset intervals: biceps femoris in stance, single support, and pre-swing phases, with SI values = -6.45%, -14.29%, and -17.14%, respectively; semitendinosus in single support phase, with SI = -12.90%; lateral gastrocnemius in swing phase, with SI = -13.33%; and medial gastrocnemius in stance and single support phases, with SI = -13.33% and -23.53%, respectively. The study outcomes supply information about intra-subject variability, which is very important in follow-up examinations and comparison with other target groups of children.
摘要：
这项研究的目的是检查在整个EMG和对称指数（SI）的时间参数中，健康儿童步态期间左右小腿之间肌肉活动的变化。共有17名健康儿童（年龄：8.06±1.92岁）参加了这项研究。通过与TrignoEMGWireless系统和Bertec力板同步的Vicon8相机运动分析系统检查了双腿上的五块肌肉；分析了起始偏移间隔。主要激活方式的最高发生频率是在站立阶段。在摆动阶段，发作-偏移仅显示一些有意义的侧不对称迹象。膝关节屈肌在发作-偏移间隔方面表现出显着差异（p<0.05）：股二头肌站立，单一支持,和摆动前阶段，SI值=-6.45%，-14.29%，和-17.14%，分别；单支阶段的半腱肌，SI=-12.90%；外侧腓肠肌处于摆动期，SI=-13.33%；站立和单支撑阶段的腓肠肌内侧，SI=-13.33%和-23.53%，分别。研究结果提供了有关受试者内部变异性的信息，这在后续检查以及与其他目标群体儿童的比较中非常重要。
