1995
DOI: 10.1007/bf01837411
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Fuel utilisation during prolonged low-to-moderate intensity exercise when ingesting water or carbohydrate

Abstract: Previously, we examined the effects of carbohydrate (CHO) ingestion on glucose kinetics during exercise at 70% of maximum O2 uptake (VO2, max). Here we repeat those studies in heavier cyclists (n = 6 per group) cycling for 3 h at a similar absolute O2 uptake but at a lower (55% of VO2, max) relative exercise intensity. During exercise, the cyclists were infused with a 2-3H-glucose tracer and ingested U-14C glucose-labelled solutions of either flavoured water (H2O) or 10 g/100 ml glucose polymer, at a rate of 6… Show more

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Cited by 19 publications
(21 citation statements)
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“…The rates of total blood glucose oxidation in the present study (-1 g.min-1) are highly comparable with other investigations with trained subjects cycling at either 55% (Rauch et al 1995) or 70% of V0 2 max (Bosch et al 1993a;Broberg and Sahlin 1989;Hawley et al 1994). However, the peak rates of ingested glucose oxidation observed in the current study (-0.5 g.min-1) are much lower than those typically measured during prolonged, moderateintensity exercise (Bosch et al 1993a;Hawley et al 1992Hawley et al , 1994Rauch et al 1995). In those studies ingested glucose oxidation typically peaks at -1.0 g.min-1 (for review see Hawley, Dennis and Noakes 1992) and contributes approximately 20% of total CHO oxidation.…”
Section: Discussionsupporting
confidence: 91%
See 1 more Smart Citation
“…The rates of total blood glucose oxidation in the present study (-1 g.min-1) are highly comparable with other investigations with trained subjects cycling at either 55% (Rauch et al 1995) or 70% of V0 2 max (Bosch et al 1993a;Broberg and Sahlin 1989;Hawley et al 1994). However, the peak rates of ingested glucose oxidation observed in the current study (-0.5 g.min-1) are much lower than those typically measured during prolonged, moderateintensity exercise (Bosch et al 1993a;Hawley et al 1992Hawley et al , 1994Rauch et al 1995). In those studies ingested glucose oxidation typically peaks at -1.0 g.min-1 (for review see Hawley, Dennis and Noakes 1992) and contributes approximately 20% of total CHO oxidation.…”
Section: Discussionsupporting
confidence: 91%
“…The effect of carbohydrate (CHO) ingestion on energy metabolism and endurance capacity during prolonged (>90 min), low-to-moderate intensity (55-70% of maximal oxygen uptake [V0 2 maxn exercise has largely been studied in cyclists protocols (Coggan & Coyle 1988, 1989Coyle et al 1983Coyle et al , 1986Flynn et al 1987;Ivy et al 1983;Neufer et al 1987;Hawley et al 1992a & b;Rauch et al 1995). Only a few groups have examined fuel kinetics during running (Wilber & Moffat 1992;Madsen et al 1990;Tsintzas et al 1993a,b).…”
Section: Introduction Aims Of Thesismentioning
confidence: 99%
“…However, endogenous glucose oxidation was not significantly modified. These data are in line with several previous studies in which glucose was ingested immediately before and/or during exercise period (Adopo et al 1994;Bosch et al 1994;Jeukendrup et al 1999;Rauch et al 1995;Wagenmakers et al 1993). However, endogenous glucose oxidation was significantly reduced by 21.4% when glucose was ingested both before and during exercise.…”
Section: Discussionsupporting
confidence: 92%
“…In these studies the metabolic fate of exogenous glucose was not measured, but the rate of plasma glucose appearance or disappearance (R d ) reported by Febbraio et al (2000b) was similar when $2 g min )1 of glucose were ingested during, and both before and during exercise (0.3-0.4 g min )1 contributing to 8)11% of the energy yield, assuming that 100% plasma glucose R d was oxidized; Jeukendrup et al 1999). These values for plasma glucose labelled glucose have, indeed, shown that when large amounts of exogenous carbohydrates are ingested (1.0-3.0 g min )1 ) during exercise performed at 50-70% maximal O 2 uptake ( _ V O 2max ) the rate of plasma glucose oxidation (Angus et al 2002) or of exogenous glucose oxidation (which is at most equal to plasma glucose oxidation; Jeukendrup et al 1999) could reach 0.9-1.7 g min )1 (Couture et al 2002;Jeukendrup et al 1999;McConell et al 1999;Pe´ronnet et al 1998;Rauch et al 1995;Wagenmakers et al 1993; see also Hawley et al 1992 andPe´ronnet et al 1992 for a review).…”
Section: Introductionmentioning
confidence: 99%
“…(2001), les études conduites utilisant les techniques de traçage montre que l'ingestion de glucides, à des taux variant de 0.6 à 3.0 g/min, ne modifie pas l'oxydation du glycogène musculaire (Febbraio et al, 2000a,b;Horowitz et al, 1999;Jentjens et al, 2006;Jeukendrup et al, 1999a;Rauch et al, 1995;. À titre d'exemple, lorsqu'une dose importante (3 g/min) de glucose fut administrée à des sujets effectuant 120 minutes d'exercice à 50 %VO 2 max, Jeukendrup et al (1999a) n'ont pas observé de ré-109 oads taken independently concentration correlated oxidized (Fig.…”
Section: Rates Of Plasma Glucose Oxidationunclassified