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Glycemic index of a meal fed before exercise alters substrate use and glucose flux in exercising horses
José Cunilleras, Eduard (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Hinchcliff, Kenneth W. (The Ohio State University. Department of Veterinary Clinical Sciences)
Sams, Richard A. (The Ohio State University. Department of Veterinary Clinical Sciences)
Devor, Steven T. (The Ohio State University. Section of Sport and Exercise Sciences)
Linderman, Jon K. (The Ohio State University. Department of Health and Sport Science)

Data: 2002
Resum: In a randomized, balanced, crossover study each of six fit, adult horses ran on a treadmill at 50% of maximal rate of oxygen consumption for 60 min after being denied access to food for 18 h and then 1) fed corn (51. 4 kJ/kg digestible energy), or 2) fed an isocaloric amount of alfalfa 2-3 h before exercise, or 3) not fed before exercise. Feeding corn, compared with fasting, resulted in higher plasma glucose and serum insulin and lower serum nonesterified fatty acid concentrations before exercise (P < 0. 05) and in lower plasma glucose, serum glycerol, and serum nonesterified fatty acid concentrations and higher skeletal muscle utilization of blood-borne glucose during exercise (P < 0. 05). Feeding corn, compared with feeding alfalfa, resulted in higher carbohydrate oxidation and lower lipid oxidation during exercise (P < 0. 05). Feeding a soluble carbohydrate-rich meal (corn) to horses before exercise results in increased muscle utilization of blood-borne glucose and carbohydrate oxidation and in decreased lipid oxidation compared with a meal of insoluble carbohydrate (alfalfa) or not feeding. Carbohydrate feedings did not produce a sparing of muscle glycogen compared with fasting.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Llengua: Anglès
Document: Article ; recerca ; Versió publicada
Matèria: Cavalls ; Glucosa ; Metabolisme ; Glycogen ; Corn ; Alfalfa
Publicat a: journal of applied physiology, Vol. 92 (2002) , p. 117-128

DOI: 10.1152/jappl.2002.92.1.117
PMID: 11744650


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