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Titolo:
Effect of carbohydrate ingestion on glucose kinetics and muscle metabolismduring intense endurance exercise
Autore:
McConell, GK; Canny, BJ; Daddo, MC; Nance, MJ; Snow, RJ;
Indirizzi:
Monash Univ, Dept Physiol, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 siol, Clayton, Vic 3168, Australia Deakin Univ, Sch Hlth Sci, Burwood, Vic 3125, Australia Deakin Univ Burwood Vic Australia 3125 Sci, Burwood, Vic 3125, Australia
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 89, anno: 2000,
pagine: 1690 - 1698
SICI:
8750-7587(200011)89:5<1690:EOCIOG>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; PROLONGED EXERCISE; STRENUOUS EXERCISE; GLYCOGEN; BLOOD; PERFORMANCE; PLASMA; SUPPLEMENTATION; AVAILABILITY; FEEDINGS;
Keywords:
endogenous glucose production; glucose absorption; insulin; carbohydrate oxidation; muscle inosine monophosphate; humans;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: McConell, GK Monash Univ, Dept Physiol, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 , Vic 3168, Australia
Citazione:
G.K. McConell et al., "Effect of carbohydrate ingestion on glucose kinetics and muscle metabolismduring intense endurance exercise", J APP PHYSL, 89(5), 2000, pp. 1690-1698

Abstract

There has been recent interest in the potential performance and metabolic effects of carbohydrate ingestion during exercise lasting similar to1 h. Inthis study, 13 well-trained men ingested in randomized order either a 6% glucose solution (CHO trial) or a placebo (Con trial) during exercise to exhaustion at 83 +/- 1% peak oxygen uptake. In six subjects, vastus lateralis muscle was sampled at rest, at 32 min, and at exhaustion, and in six subjects, glucose kinetics was determined by infusion of [6,6-H-2]glucose in bothtrials and ingestion of [6-H-3]glucose in the CHO trial. Of the 84 g of glucose ingested during exercise in the CHO trial, only 22 g appeared in the peripheral circulation. This resulted in a small (12 g) but significant (P < 0.05) increase in glucose uptake without influencing carbohydrate oxidation, muscle glycogen use, or time to exhaustion (CHO: 68.1 +/- 4.1 min; Con:69.6 +/- 5.5 min). Decreases in muscle phosphocreatine content and increases in muscle inosine monophosphate and lactate content during exercise weresimilar in the two trials. Although endogenous glucose production during exercise was partially suppressed in the CHO trial, it remained significantly above preexercise levels throughout exercise. In conclusion, only 26% of the ingested glucose appeared in the peripheral circulation. Glucose ingestion increased glucose uptake and partially reduced endogenous glucose production but had no effect on carbohydrate oxidation, muscle metabolism, or time to exhaustion during exercise at 83% peak oxygen uptake.

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Documento generato il 28/09/20 alle ore 15:18:20