Journal
JOURNAL OF APPLIED PHYSIOLOGY
Volume 96, Issue 4, Pages 1285-1291Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.01023.2003
Keywords
carbohydrate absorption; stable isotopes; substrate utilization; metabolism; sodium-dependent glucose transporter 1; cyclists
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The purpose of the present study was to investigate whether combined ingestion of two carbohydrates (CHO) that are absorbed by different intestinal transport mechanisms would lead to exogenous CHO oxidation rates of > 1.0 g/min. Nine trained male cyclists (maximal O-2 consumption: 64 +/- 2 ml . kg body wt(-1) . min(-1)) performed four exercise trials, which were randomly assigned and separated by at least 1 wk. Each trial consisted of 150 min of cycling at 50% of maximal power output (60 +/- 1% maximal O-2 consumption), while subjects received a solution providing either 1.8 g/min of glucose (Glu), 1.2 g/min of glucose + 0.6 g/min of sucrose ( Glu + Suc), 1.2 g/min of glucose + 0.6 g/min of maltose ( Glu + Mal), or water. Peak exogenous CHO oxidation rates were significantly higher ( P < 0.05) in the Glu + Suc trial (1.25 +/- 0.07 g/min) compared with the Glu and Glu + Mal trials (1.06 +/- 0.08 and 1.06 +/- 0.06 g/min, respectively). No difference was found in ( peak) exogenous CHO oxidation rates between Glu and Glu + Mal. These results demonstrate that, when a mixture of glucose and sucrose is ingested at high rates ( 1.8 g/min) during cycling exercise, exogenous CHO oxidation rates reach peak values of similar to 1.25 g/min.
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