0000000000433375
AUTHOR
A. Gauthier
Rythme Circadien du Couple Developpe Par Les Muscles Flechisseurs du Coude Lors de Contractions Isometriques et Dynamiques
(1995). Rythme Circadien du Couple Developpe Par Les Muscles Flechisseurs du Coude Lors de Contractions Isometriques et Dynamiques. Archives of Physiology and Biochemistry: Vol. 103, No. 3, pp. C53-C53.
Diurnal Rhythm of the Muscular Performance of Elbow Flexors During Isometric Contractions
The influence of time of day on elbow flexion torque was studied. Thirteen physical education students, 7 males and 6 females, made maximal and submaximal isometric contractions at 90 degrees of elbow flexors using a dynamometer. The torque developed was measured on each contraction. The myoelectric activity of the biceps muscle was also measured at the same time by surface electromyography (EMG) and quantified from the root mean square (RMS) activity. Torque and surface EMGs were measured at 6:00, 9:00, 12:00, 15:00, 18:00, 21:00, and 24:00 h over the same day. Oral temperature before each test session was measured on each occasion after a 30-min rest period. We observed a diurnal rhythm i…
Circadian rhythm in the torque developed by elbow flexors during isometric contraction. Effect of sampling schedules.
Time-dependent changes in elbow flexion torque have been documented according to two different sampling schedules. Seven physical education students took part in the first series of experiments, and 7 other similar subjects in the second. In both sets of experiments, the subjects performed isometric contractions: maximal and submaximal at 90 degrees in the first experiments and maximal at different angular positions in the second. After a 30-minute rest period, the torque developed was measured at 00:00, 06:00, 09:00, 12:00, 15:00, 18:00, and 21:00 h on the day of the experiment. These subjects remained in the laboratory for 24 h. In the second series of experiments, the torque developed wa…
Fluctuations nycthémérales des capacités musculaires chez l’homme sportif : avec sommeil versus en privation de sommeil
L’objectif de ce travail a consiste, a partir d’une partie des resultats de deux etudes differentes, a estimer les effets de la privation de sommeil sur les fluctuations circadiennes du fonctionnement du systeme musculo-squelettique. Dans chacune des etudes (EAS et EPS ), les moments musculaires isometriques maximaux et les activites electromyographiques des muscles impliques ont ete enregistres a sept reprises au cours du nycthemere a l’aide d’un ergometre isocinetique : contractions volontaires breves de flexion du coude pour EAS dont les sujets ont dormi a des horaires standardises, et d’extension de la jambe pour EPS dont les sujets ont ete completement prives de sommeil. Les resultats …
Les prélèvements paléoenvironnementaux et géoarchéologiques : principes de conservation et orientations pour le tri / sélection
International audience; Ce travail propose un questionnement sur les modalités de conservation des prélèvements paléoenvironnementaux et géoarchéologiques qui ont été réalisés dans le cadre de recherches archéologiques, en prenant en compte leur intérêt scientifique et leur statut patrimonial. Il s’interroge également sur la question de l’intérêt scientifique de ces restes dans le cadre des discussions en cours. Celles-ci interviennent dans le cadre des procédures de conservation sélective des biens archéologiques mobiliers, introduit par l’ordonnance du 29 juin 2017 relative aux règles de conservation, de sélection et d’étude du patrimoine archéologique mobilier. Construit comme une synthè…
Circadian rhythms in human muscular efficiency: continuous physical exercise versus continuous rest. A crossover study.
This study deals with the influence of time of day on neuromuscular efficiency in competitive cyclists during continuous exercise versus continuous rest. Knee extension torque was measured in ultradistance cyclists over a 24h period (13:00 to 13:00 the next day) in the laboratory. The subjects were requested to maintain a constant speed (set at 70% of their maximal aerobic speed obtained during a preliminary test) on their own bicycles, which were equipped with cyclosimulators. Every 4h, torque developed and myoelectric activity were estimated during maximal isometric voluntary contractions of knee extensors using an isokinetic dynamometer. Mesenteric temperature was monitored by telemetry.…