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Effect of carbohydrate ingestion on glucose kinetics during exercise in the heat

Angus, Damien J., Febbraio, Mark A., Lasini, David and Hargreaves, Mark 2001, Effect of carbohydrate ingestion on glucose kinetics during exercise in the heat, Journal of applied physiology, vol. 90, no. 2, pp. 601-605.

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Title Effect of carbohydrate ingestion on glucose kinetics during exercise in the heat
Author(s) Angus, Damien J.
Febbraio, Mark A.
Lasini, David
Hargreaves, Mark
Journal name Journal of applied physiology
Volume number 90
Issue number 2
Start page 601
End page 605
Publisher American Physiological Society
Place of publication Bethesda, Md.
Publication date 2001-02
ISSN 8750-7587
1522-1601
Keyword(s) heat stress
liver glucose output
muscle glucose uptake
Summary Six endurance-trained men [peak oxygen uptake (VO2) = 4.58 ± 0.50 (SE) l/min] completed 60 min of exercise at a workload requiring 68 ± 2% peak VO2 in an environmental chamber maintained at 35°C (<50% relative humidity) on two occasions, separated by at least 1 wk. Subjects ingested either a 6% glucose solution containing 1 µCi [3-3H]glucose/g glucose (CHO trial) or a sweet placebo (Con trial) during the trials. Rates of hepatic glucose production [HGP = glucose rate of appearance (Ra) in Con trial] and glucose disappearance (Rd), were measured using a primed, continuous infusion of [6,6-2H]glucose, corrected for gut-derived glucose (gut Ra) in the CHO trial. No differences in heart rate, VO2, respiratory exchange ratio, or rectal temperature were observed between trials. Plasma glucose concentrations were similar at rest but increased (P < 0.05) to a greater extent in the CHO trial compared with the Con trial. This was due to the absorption of ingested glucose in the CHO trial, because gut Ra after 30 and 50 min (16 ± 5 µmol · kg-1 · min-1) was higher (P < 0.05) compared with rest, whereas HGP during exercise was not different between trials. Glucose Rd was higher (P < 0.05) in the CHO trial after 30 and 50 min (48.0 ± 6.3 vs 34.6 ± 3.8 µmol · kg-1 · min-1, CHO vs. Con, respectively). These results indicate that ingestion of carbohydrate, at a rate of ~1.0 g/min, increases glucose Rd but does not blunt the rise in HGP during exercise in the heat.
Language eng
Field of Research 110602 Exercise Physiology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, American Physiological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008397

Document type: Journal Article
Collection: School of Health Sciences
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