0000000000237568
AUTHOR
D. Davenne
Regulation of noradrenergic coerulean neuronal firing mediated by 5-HT2 receptors: involvement of the prepositus hypoglossal nucleus.
Abstract Previous studies have indicated a 5-HT2-mediated inhibitory influence on unit activity in the locus coeruleus. In the present work, attempts were made to determine which area(s) of the brain is (are) involved in this effect: (1) Microiontophoretic application of serotoninergic compounds (quipazine, ketanserin, RU 24969 (Roussel Uclaf), 8-hydroxy-2(di-n-propylamino) tetralin (8-OH-DPAT), metergoline, serotonin) in the locus coeruleus, did not alter the coerulean discharge. Local microinjection of quipazine or ketanserin in the area of the locus coeruleus, as well as in one of its major afferents, the prepositus hypoglossi, had no effect on the unit activity in the locus coeruleus. 1…
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…
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 …