PMID- 1592058
OWN - NLM
STAT- MEDLINE
DCOM- 19920626
LR  - 20190827
IS  - 0301-5548 (Print)
IS  - 0301-5548 (Linking)
VI  - 64
IP  - 4
DP  - 1992
TI  - Oxidation of exogenous carbohydrate during prolonged exercise: the effects of the 
      carbohydrate type and its concentration.
PG  - 328-34
AB  - 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, expired 14CO2 and carbon dioxide output (VCO2). Total CHO 
      oxidation, determined from oxygen consumption and VCO2 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.
FAU - Moodley, D
AU  - Moodley D
AD  - Department of Physiology, University of Cape Town Medical School Observatory, 
      South Africa.
FAU - Noakes, T D
AU  - Noakes TD
FAU - Bosch, A N
AU  - Bosch AN
FAU - Hawley, J A
AU  - Hawley JA
FAU - Schall, R
AU  - Schall R
FAU - Dennis, S C
AU  - Dennis SC
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Germany
TA  - Eur J Appl Physiol Occup Physiol
JT  - European journal of applied physiology and occupational physiology
JID - 0410266
RN  - 0 (Blood Glucose)
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Polymers)
RN  - 57-50-1 (Sucrose)
RN  - IY9XDZ35W2 (Glucose)
SB  - IM
MH  - Adult
MH  - Blood Glucose/metabolism
MH  - Dietary Carbohydrates/*metabolism
MH  - Exercise/*physiology
MH  - Gastric Emptying
MH  - Glucose/metabolism
MH  - Humans
MH  - Kinetics
MH  - Male
MH  - Oxidation-Reduction
MH  - Oxygen Consumption
MH  - Polymers
MH  - Sucrose/metabolism
EDAT- 1992/01/01 00:00
MHDA- 1992/01/01 00:01
CRDT- 1992/01/01 00:00
PHST- 1992/01/01 00:00 [pubmed]
PHST- 1992/01/01 00:01 [medline]
PHST- 1992/01/01 00:00 [entrez]
AID - 10.1007/BF00636220 [doi]
PST - ppublish
SO  - Eur J Appl Physiol Occup Physiol. 1992;64(4):328-34. doi: 10.1007/BF00636220.