Dynamic Electromyographic Analysis of Normal Children

• Main Authors: Wu, Huey-Fen, 吳慧芬
• Other Authors: 蘇芳慶
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/87677667927532918901

碩士 === 國立成功大學 === 醫學工程研究所 === 83 === Main three purposes in this study are (1) to analyze children gait electromyography (EMG), (2) to assess bilateralism, and (3) to examine reliability of averaging number of strides. Ten subjects, aged from 5 to 6 years old are recurited in this study. The EMG data were collected with surface electrodes and sampled at 1OOOHz. And the timing of data were divided by footswitches. The EMG linear envelope (LE) is generated from the raw EMG signal through band-pass filtering, rectifying, and normalization procedures with respect to maximum muscle manual testing (MVC) in which timing was gait cycle. The ensemble averaging of EMG LEs are used to demonstrate the pooled data of all testes. In addition, the muscle activity is generated by threshold 5% MVC. The study selected five muscles: tibialis anterior, medial gastrocenemius, rectus femoris, biceps femoris, and gluteus maximus. The results show that tibialis anterior, rectus femoris, biceps femoris, and gluteus maximus appear the primary mean peak activity in terminal swing, and the actions are preparing for stance phase. Medial gastrocenemius acts for push off in the middle swing (35%-36%). The action is progression force in the gait cycle. Tibialis anterior and rectus femoris appear an additional mean peak between terminal stance and initial swing. The action accelerates. The muscle activity phase demonstrates an immature pattern in the medial gastrocenemius that prolong activity from the terminal swing to the terminal stance. The muscle activity phase demonstrates leg a mature pattern in the rectus femoris which activity is accelerative action from mid-stance to terminal stance. In the bilateralism test, the results are significant bilateral difference (p<0.05) on gluteus maximum during entire gait cycle and during swing phase. This study suggests that there was a larger neural drive to gluteus maximum on nondominant leg, which implied that the non-dominant leg generates more energy than the dominate leg. Three strides showed high reliability (ＲI>0.9) in nondominate leg.