Electromyographic studies on the activity of muscles of under limbs, m. rectus femoris, m. sartorius, m. biceps femoris, m. tibialis anterior, m. fibularis longus, m. gastrocnemius, m. flexor digitorum longus and m. extensor digitorum brevis during the Walking Step of dancing were made using the surface electrodes, and were analysed and compared forming into a table of quantity by the total electric output of each muscles of the pattern. In dancing 4 skilled girl students and 3 unskilled were tested. Results obtained are as follows:
1. The coefficient of correlation on the height of waves and the diminsions are extremely high.
2. The element of + and - on the height of waves in some muscles are a fairly correlative with each other. But some muscles are nearly next to impossible. So that, it is desired that the comparison will be performed on the sum of the elements of + and -, calculating the height of waves H, the frequency n, and H/n on the individual elements.
3. Walking Step has some electromyographically common patterns as follows when all persons tested. The total electrical output during Walking Step is the highest in m. tibialis anterior and m. flexor digitorum longus, and the lowest in m. rectus femoris and m. sartorius. The activity of m. tibialis anterior is especially high during the period from the lifting the right foot to its crossing with the left foot. The activity of m. flexor digitorum longus and m. gastrocnemius seems to increase gradually during the supporting period, but it is weak during the oscillating period. M. biceps femoris is especially active during the period from landing of the right tiptoe to leaving the left foot from the ground.
4. The pattern of Walking Step is somewhat different person to person, but not so remarkably different at repeated testings on the same person.
5. For the good trained girls the beginning and the end of discharges are sharper, and the daily differences of patterns are smaller than for the not trained
.6. For the trained girls the total electric output of each muscle holds the mean value, but no so for the untrained, taking higher or lower value.
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