Abstract
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1.
Dynamics of plasma cortisol and glucose contents during and after submaximal muscular exercise are studied by sampling at 5 min intervals and compared to the day-time variations observed at rest.
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2.
Muscular exercise performed between 10.00 and 10.20 h on a bicycle ergometer modifies the normal excretion pattern of plasma cortisol. A rise occurs 10 min after the start of exercise and a secretory peak is superimposed to the gradual morning decline observed in resting conditions.
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3.
Glucose concentration shows a transient drop during the exercise, followed by a rise to the initial level 20 min after the end of the muscular activity.
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4.
The temporal relations between plasma cortisol and plasma glucose concentrations suggest that adaptive reactions of the pituitary-adrenocortical axis may contribute to the recovery of the initial glucose level.
Résumé
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1.
Des analyses effectuées à intervalles rapprochés pendant dix heures consécutives ont permis d'étudier les variations des taux de cortisol et de glucose plasmatiques sous l'effet d'un exercice musculaire submaximal et de les comparer aux variations préalablement observées chez l'homme au repos.
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2.
Cet exercice musculaire sur bicycle ergométrique de 10.00 h à 10.20 h entraîne une augmentation transitoire du taux de cortisol, survenant 10 min après le début de l'exercice et se superposant à la diminution lente et régulière observée au cours de la matinée chez les sujets au repos.
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3.
La courbe d'évolution du glucose plasmatique présente une diminution pendant la durée de l'exercice suivie d'un retour au niveau initial 20 min après la fin de l'exercice musculaire.
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4.
Les relations temporelles entre les variations transitoires et de sens contraire du glucose et du cortisol plasmatiques dues à l'exercice musculaire suggèrent la mise en jeu de réactions adaptives de l'axe hypophyso-surrénalien, qui contribueraient au rétablissexnent de l'équilibre glycémique.
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Follenius, M., Brandenberger, G. Influence de l'exercice musculaire sur l'évolution de la cortisolémie et de la glycémie chez l'homme. Europ. J. Appl. Physiol. 33, 23–33 (1974). https://doi.org/10.1007/BF00423181
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DOI: https://doi.org/10.1007/BF00423181