Time of day effects on isometric and isokinetic torque developed during elbow flexion in humans |
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Authors: | Antoine Gauthier Damien Davenne Alain Martin Jacques Van Hoecke |
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Institution: | (1) Groupe Analyse du Mouvement, Unite de Formation et de la Recherche en Sciences et Techniques des Activités Physiques et Sportives (UFRSTAPS), Université de Bourgogne, BP 27 877 21078 Dijon Cedex, France e-mail: vanhoeck@u-bourgogne.fr; Fax: +33-03-80396702, FR;(2) Centre de Recherche en Activités Physiques et Sportives, UFRSTAPS, Université de Caen-Basse Normandie, 2 Bd Mal Juin, 14 032 Caen Cedex, France, FR |
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Abstract: | The aim of this study was, firstly, to confirm or refute the existence of circadian rhythms during several velocities of
concentric action of the elbow flexor muscles and, secondly, to compare the characteristics of these circadian rhythms with
those obtained during isometric actions. Eight volunteer subjects participated in this study. The circadian rhythms were obtained
from six test sessions (TS) carried out at different times of day over 6 days with only one TS a day. During each TS, oral
temperature and the torque of the muscle action were measured. The subjects made, on an isokinetic ergometer, two maximal
isokinetic concentric elbow flexions at five angular velocities (60, 120, 180, 240 and 300° · s−1) and at an angle of 60°. Torque-angular velocity relationships, which characterised the functioning of the muscle during
concentric and isometric actions, were established for the different times of day. The values of the torque recorded at each
of the angular velocities presented a clear circadian rhythm. After normalisation of the torque values, no significant differences
were observed among the computed characteristics of the circadian rhythms obtained at different angular velocities. Since
the circadian rhythms during isometric and concentric torque were the same, the characteristics of the circadian rhythms of
the musculo-skeletal system can be studied using either type of muscle action. The results indicated that torque and temperature
varied concomitantly during the day. Thus, the recording of body temperature allows one to estimate the times of occurrence
of maximal and minimal values in the circadian rhythm of muscle torque.
Accepted: 10 October 2000 |
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Keywords: | Muscle torque Chronobiology Elbow flexor |
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