caa a22 4500 469055545 CHVBK 20180323132842.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00636220 doi (NATIONALLICENCE)springer-10.1007/BF00636220 Oxidation of exogenous carbohydrate during prolonged exercise: the effects of the carbohydrate type and its concentration [Elektronische Daten] [Dhesan Moodley, Timothy Noakes, Andrew Bosch, John Hawley, Robert Schall, Steven Dennis] Summary: We studied rates of exogenous carbohydrate (CHO) oxidation during 90 min of cycling exercise in trained cyclists exercising at 70% of maximal oxygen consumption (VO2max) when they ingested glucose, sucrose, or glucose polymer solutions at concentrations of 7.5%, 10% or 15%. Drinks were labelled with [U-14C]glucose or sucrose and were ingested at a rate of 100 ml · 10 min−1. Rates of oxidation of the ingested CHO were calculated from the specific radio-activity of the labelled CHO, expired14CO2 and carbon dioxide output (VCO2). Total CHO oxidation, determined from oxygen consumption andVCO2 was not influenced by CHO type or concentration. Gastric emptying (P=0.01) and the rate of exogenous CHO oxidation (P=0.028) was greatest for the glucose polymer solutions, and least for glucose. Although gastric emptying (P=0.006) decreased with increasing CHO concentration, CHO delivery to the intestine and exogenous CHO oxidation increased linearly with increasing CHO concentration. The percentage of the CHO delivered to the intestine that was oxidized ranged from 30.0% for 7.5% CHO to 38.1% for 15% CHO. Our results indicated that the rate of gastric emptying for CHO was not controlled to provide a constant rate of energy delivery as is commonly believed and that factors subsequent to gastric emptying limit the rate of exogenous CHO oxidation from the ingested solution. Springer-Verlag, 1992 Carbohydrate nationallicence Prolonged exercise nationallicence Glucose nationallicence Sucrose nationallicence Oxidation nationallicence Gastric emptying nationallicence Moodley Dhesan Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut Noakes Timothy Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut Bosch Andrew Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut Hawley John Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut Schall Robert Institute for Biostatistics of the South African Medical Research Council, Parow, South Africa aut Dennis Steven Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 328-334 0301-5548 64:4<328 1992 64 421 https://doi.org/10.1007/BF00636220 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00636220 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moodley Dhesan Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut NATIONALLICENCE 700 1- Noakes Timothy Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut NATIONALLICENCE 700 1- Bosch Andrew Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut NATIONALLICENCE 700 1- Hawley John Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut NATIONALLICENCE 700 1- Schall Robert Institute for Biostatistics of the South African Medical Research Council, Parow, South Africa aut NATIONALLICENCE 700 1- Dennis Steven Liberty Life Chair of Exercise and Sports Science and MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School Observatory, 7925, Cape Town, South Africa aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 328-334 0301-5548 64:4<328 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer