By Tsutomu and Kayoko Okamoto
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Additional info for Development of Gait By Electromyography
Mutually antagonistic muscles in single stance exhibited the reciprocal pattern more readily than previously. The co-contraction pattern was hardly seen, and the reversed reciprocal pattern was not seen at all in this period. Fig. 3-4 (right) shows EMGs at 5 months after birth. 5 months after birth. lIi,/"Il. 5 months Fig. 3-5. EMGs of infant supported walking (Left: at 6 months after birth, Center: at 9 months after birth, Right: at 11,5 months after birth), Fig. 5 months after birth. After around 6 months after birth, the infant began to crawl after toys and tended to show comparatively stable stepping when supported upright.
In stance phase from foot contact until push off, the role of the vastus medialis for maintaining stability became clear as a slightly squatted position was used to lower the center of gravity. Orderly reciprocal or co-contraction patterns of activity in the rectus femoris and biceps femoris or in the tibialis anterior and gastrocnemius were found to be related to returning the body's center of mass toward its initial position. In the latter half of swing phase, the vastus medialis and gastrocnemius showed strong activities with the knee extending and ankle plantarllexing for active leg extension to prevent falling.
The TA, RF, and BF exhibited notable myoelectric activity as the ipsilateral foot was leaving the floor to begin swing phase. The TA continued to be active throughout much of swing phase, whereas the RF showed no more than sporadic weak activity during that period, 48 Development of Gait and the BF was relatively silent until stance phase was being approached. The LG, VM, and GM did not show any remarkable activity during swing phase. During stance phase, the LG, BF, and GM showed relatively continuous activity as antigravity muscles.