Abstract
Responses to change in posture of four leg muscles, quadriceps muscle, hamstrings, gastrocnemius muscle, and anterior tibial muscle were examined by an electromyograph A tilting turn table led healthy subjects standing on it to assume various postures, rotating at a speed of 2 rpm and tilting at tilt angles of 0, 8, and 15 degrees.
Results obtained were as follows:
(1) As a tilt angle became wider, activities of four leg muscles were increasing.
(2) Responses to change in posture occurred by rotation or tilting were varied in each subject. This was supposed to correspond to an individual difference in keeping balance. On the other hand, pelves of all subjects were kept horizontally and trunks in upright positions.
(3) Under the condition of rotation and tilt, point and period of muscle activity differ both in each four leg muscle and in individuals.
