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Effect of carbohydrate ingestion on metabolism during running and cycling


Effect of carbohydrate ingestion on metabolism during running and cycling



Journal of Applied Physiology 91(5): 2125-2134



ISSN/ISBN: 8750-7587

PMID: 11641353

DOI: 10.1152/jappl.2001.91.5.2125

Arkinstall, Melissa J., Clinton R. Bruce, Vasilis Nikolopoulos, Andrew P. Garnham, and John A. Hawley. Effect of carbohydrate ingestion on metabolism during running and cycling. J Appl Physiol 91: 2125-2134, 2001.--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 [plus or minus] 20 vs. 42 [plus or minus] 16 g/h; P < 0.01) and cycling (57 [plus or minus] 16 vs. 35 [plus or minus] 12 g/h; P < 0.01). Accordingly, the contribution from plasma glucose oxidation to total carbohydrate oxidation was greater during both running (33 [plus or minus] 4 vs. 23 [plus or minus] 3%; P < 0.01) and cycling (36 [plus or minus] 5 vs. 22 [plus or minus] 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 [plus or minus] 32 vs. 141 [plus or minus] 34 mmol/kg dry mass) or cycling (227 [plus or minus] 36 vs. 216 [plus or minus] 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. Reprinted by permission of the publisher.

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