par Duchateau, Jean ;Hainaut, Karl
Référence Journal de Biophysique et Medecine Nucleaire, 5, 5, page (249-253)
Publication Publié, 1981
Article révisé par les pairs
Résumé : This work is concerned with the study of the effects of isometric and dynamic exercises on the contractile properties in human muscle. The adaptation of intrinsic force and velocity of shortening, as well as that of active state in muscle, is analysed. Results show that isometric exercise mainly augments the intrinsic force of shortening, whereas dynamic exercise mostly increases speed of shortening and speed of relaxation. Furthermore, dynamic exercise intensifies excitation-contraction coupling in muscle. Study of motor unit (MU) mechanical properties (spike triggered averaging method) indicates a general augmentation of MU twitch force after training. Amazingly, dynamic exercise potentiates more smaller MU than larger MU. Results further indicate that MU recruitment order is not changed, neither by isometric exercise, nor by dynamic exercise, in man.