Global electromyography of the diaphragm, in its laboratory applications, contributes considerably to the analysis of respiratory movements; at the same time, it permits the counting of the heart rate (24,7). The indications for electromyography become of prime importance when classical methods of mechanics of breathing or electrocardiography are inapplicable or present difficulties, which is the case in numerous sport activities. It then becomes necessary to resort to telemetry or autonow~us memorizing. Miniaturized portable (3,20,22) orimplanted (15,17) transmitters hinder in no way subjects examined by telemetry. Depending upon the equipment, however, the latter loses its effectiveness beyond a variable radius of action of a few meters to a few hundred meters (23). Besides, it is inapplicable for use in underwater diving. A large freedom of movement and displacement is actually obtained thanks to a long playing tape in the portable equipment which is directly connected to the derivating electrodes. Considering the lightness and the slight bulkiness of the equipment worn by the subject, we refer to autonomous memorizing (4-8).
© Copyright 1971 First International Symposium on "Biomechanics and Swimming, Waterpolo and Diving", 14-16 September 1970. Proceedings. Published by Universite Libre de Bruxelles; Laboratoire de l'effort. All rights reserved.