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Effect of carbohydrate ingestion on metabolism during running and cycling

Arkinstall, Melissa, Bruce, Clinton, Nikolopoulos, Vasilis, Garnham, Andrew and Hawley, John 2001, Effect of carbohydrate ingestion on metabolism during running and cycling, Journal of applied physiology, vol. 91, no. 5, pp. 2125-2134.

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Title Effect of carbohydrate ingestion on metabolism during running and cycling
Author(s) Arkinstall, Melissa
Bruce, ClintonORCID iD for Bruce, Clinton orcid.org/0000-0002-0515-3343
Nikolopoulos, Vasilis
Garnham, Andrew
Hawley, John
Journal name Journal of applied physiology
Volume number 91
Issue number 5
Start page 2125
End page 2134
Publisher American Physiological Society
Place of publication Bethesada, Md.
Publication date 2001-11
ISSN 8750-7587
1522-1601
Keyword(s) muscle metabolism
plasma glucose oxidation
U-14C
Summary The effects of carbohydrate or water ingestion on metabolism were investigated in seven male subjects during two running and two cycling trials lasting 60 min at individual lactate threshold using indirect calorimetry, U-14C-labeled tracer-derived measures of the rates of oxidation of plasma glucose, and direct determination of mixed muscle glycogen content from the vastus lateralis before and after exercise. Subjects ingested 8 ml/kg body mass of either a 6.4% carbohydrate-electrolyte solution (CHO) or water 10 min before exercise and an additional 2 ml/kg body mass of the same fluid after 20 and 40 min of exercise. Plasma glucose oxidation was greater with CHO than with water during both running (65 ± 20 vs. 42 ± 16 g/h; P < 0.01) and cycling (57 ± 16 vs. 35 ± 12 g/h; P < 0.01). Accordingly, the contribution from plasma glucose oxidation to total carbohydrate oxidation was greater during both running (33 ± 4 vs. 23 ± 3%; P < 0.01) and cycling (36 ± 5 vs. 22 ± 3%; P < 0.01) with CHO ingestion. However, muscle glycogen utilization was not reduced by the ingestion of CHO compared with water during either running (112 ± 32 vs. 141 ± 34 mmol/kg dry mass) or cycling (227 ± 36 vs. 216 ± 39 mmol/kg dry mass). We conclude that, compared with water, 1) the ingestion of carbohydrate during running and cycling enhanced the contribution of plasma glucose oxidation to total carbohydrate oxidation but 2) did not attenuate mixed muscle glycogen utilization during 1 h of continuous submaximal exercise at individual lactate threshold.
Language eng
Field of Research 110602 Exercise Physiology
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, the American Physiological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008473

Document type: Journal Article
Collection: School of Health Sciences
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