Abstract
Flexor muscle and extensor muscle of upper limb were trained with concentric and eccentric contraction. The effects of these traning were estimated as their isometric strength at several elbow angles. The electromyogram recorded during these contraction was observed.
Beside the“Udezumo champion”who were trained isometrically, concentrically and eccentrically on their upper limb muscles under special competitive form were tested on girth, strength and electromyogram and compared with normal subjects.
The results were as follows.
1) The strength of flexor muscle was increased at the ending point of movement with concentric and eccentric training either.
2) The strength of extensor muscle was increased at the starting point of movement with concentric and eccentric training either.
3) Female trained eccentrically were increased of their overarm girth and of their motor unit number of forearm. But in man the effects were opposite i.e, forearm girth and overarm motor unit number were increased. And it seems to us that the larger the elbow angle is, the more the active motor unit number is.
4) The well trained“Udezumo champion”showed that the difference of arm flexor strength at three elbow angles were a little and the almost same pattern of EMG wasobtained throughout all range of their arm movement on main muscles. These findings were not observed in control students.
From above mentioned results and several relative literatures we would like to claim that the difference of training method will not only influences as hypertrophy of muscle fibre at various angles of articulation but makes the change of neuromuscular coordinations.
