Abstract:

BACKGROUND: Bioelectricity activities of the muscle are the function part of the human body, which can reflect the motor function of the human body.
OBJECTIVE: To observe and analyze the surface electromyography activity of the lower limb muscles of normal young people during natural gait.
METHODS: Lower limb muscles (Rectus femoris muscle, Tibialis anterior muscle, Biceps femoris muscle, Medial head of gastrocnemius muscle) of 30 normal young people were tested in flat land walking by surface electromyography (NORAXON TELEMYO 2400R G2, USA). The variation regularity of each parameter within every normal gait was analyzed．
RESULTS AND CONCLUSION: While the normal young people ware walking naturally on flat ground, their muscle electrical activities changed in periodic of active and static along with the gait cycle, and the right left side muscle of the same name moved alternately; The maximal values of the mean amplitude, the integral electromyography, the mean frequency, the median frequency were the medial head of gastrocnemius muscle, others from large to small were Tibialis anterior muscle, Biceps femoris muscle, Rectus femoris muscle, and the right-left leg distributed rule was consistent; The mean amplitude, the mean frequency, the median frequency of the right medial head of gastrocnemius muscle were lower than the left corresponding values, and the difference had statistical significance (P < 0.05); Trained muscle's time domain and frequency range fluctuated in a certain scope. The electrical activity of the lower limb muscles of normal young people is rhythmic and an alternative movement of the right and left during natural gait; The electrical activity of the medial head of gastrocnemius muscle is strongest in trained muscles; The electrical activity of the medial head of gastrocnemius muscle is different between the dominant side and the non-dominant one; Lower limb muscle’s time domain and frequency range can fluctuate in a certain scope.