Effects of muscle CHO-loading manipulations on hormonal responses during prolonged exercise

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Deutscher übersetzter Titel:Auswirkungen von manipulierter Kohlenhydratspeicherung des Muskels auf Hormonreaktionen waehrend Ausdauerbelastung
Autor:Lavoie, J.-M.; Helie, R.; Peronnet, F.; Cousineau, D.; Provencher, P.J.
Erschienen in:International journal of sports medicine
Veröffentlicht:6 (1985), 2, S. 95-99, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2008-1025821
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Erfassungsnummer:PU198506024402
Quelle:BISp

Abstract

This study examined the effects of a pre-experimental period of muscle carbohydrate (CHO)-loading manipulations followed by a 24-h CHO-poor diet, intended to increase muscle glycogen content and reduce hepatic glycogen levels, on substrate and endocrine responses during a period of prolonged exercise. Seven subjects pedaled a cycle ergometer for 70 min at 64 leg V02max (1) after normal CHO intake (CHON) and (2) after leg muscle CHO loading (CHOL), both of these procedures being followed by a period of arm exercise (70 min; 70 arm V02max) and 24 h CHO-poor intake. CHON, as compared to CHOL condition, resulted in greater blood concentrations of free fatty acids, glycerol norepinephrine, epinephrine, and cortisol at min 70 of exercise. Insulin concentrations during exercise showed a strong tendency to be lower in CHON than in CHOL condition, although the differences were not significant. There were no significant differences between the two conditions in blood glucose, lactate, and glucagon concentrations. These data indicate that muscle CHOloading manipulations intended to specifically increase the muscle glycogen content are associated with the difference in metabolic adaptation and hormonal changes during exercise. Verf.-Referat