PMID- 1559921
OWN - NLM
STAT- MEDLINE
DCOM- 19920513
LR  - 20171213
IS  - 8750-7587 (Print)
IS  - 0161-7567 (Linking)
VI  - 72
IP  - 2
DP  - 1992 Feb
TI  - Gastric emptying, absorption, and carbohydrate oxidation during prolonged 
      exercise.
PG  - 468-75
AB  - This study was designed to examine aspects of digestive function that may limit 
      assimilation of water and oxidation of orally ingested carbohydrate (CHO) during 
      exercise. Eight males completed a crossover study in which each cycled on four 
      occasions for 80 min at 70% maximal O2 consumption. Beverage was consumed at 0, 
      20, 40, and 60 min. Beverages were water, 4.5% glucose (4.5G), 17% glucose (17G), 
      and 17% maltodextrin (17MD). CHO beverages contained 20 meq/l NaCl and were 13C 
      enriched to measure exogenous CHO oxidation. Gastric (beverage) volume was 
      measured at 80 min. Water uptake was estimated by including 2H2O in the beverage 
      and measuring 2H accumulation in blood. Jejunal perfusion tests were conducted at 
      rest with the same subjects and beverages. In 60 min, 1,294 +/- 31 (SE) ml were 
      ingested; at 80 min, volumes emptied with H2O (1,257 +/- 32 ml) and 4.5G (1,223 
      +/- 32 ml) were greater than with 17G (781 +/- 56 ml) and 17MD (864 +/- 71 ml; P 
      less than 0.05). Total CHO oxidized was similar with all beverages, but there was 
      a greater increase in exogenous CHO oxidation over time with 17G and 17MD than 
      with 4.5G; 54, 19, and 18% of the CHO ingested with 4.5G, 17G, and 17MD, 
      respectively, was oxidized. This represents 57, 32, and 27%, respectively, of the 
      CHO emptied from the stomach. 2H accumulation in the blood was more rapid with 
      H2O and 4.5G than with 17G or 17MD. Net jejunal water absorption was greater from 
      4.5G than from water. Net water absorption was also observed from 17MD, whereas 
      net secretion was observed with 17G.(ABSTRACT TRUNCATED AT 250 WORDS)
FAU - Rehrer, N J
AU  - Rehrer NJ
AD  - Department of Sports Medicine and Human Physiology, Free University of Brussels, 
      Belgium.
FAU - Wagenmakers, A J
AU  - Wagenmakers AJ
FAU - Beckers, E J
AU  - Beckers EJ
FAU - Halliday, D
AU  - Halliday D
FAU - Leiper, J B
AU  - Leiper JB
FAU - Brouns, F
AU  - Brouns F
FAU - Maughan, R J
AU  - Maughan RJ
FAU - Westerterp, K
AU  - Westerterp K
FAU - Saris, W H
AU  - Saris WH
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Appl Physiol (1985)
JT  - Journal of applied physiology (Bethesda, Md. : 1985)
JID - 8502536
RN  - 0 (Dietary Carbohydrates)
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Adult
MH  - Body Weight/physiology
MH  - Dietary Carbohydrates/metabolism
MH  - Digestion/*physiology
MH  - Exercise/*physiology
MH  - Gastric Emptying/physiology
MH  - Humans
MH  - Intestinal Absorption/physiology
MH  - Male
MH  - Oxidation-Reduction
MH  - Plasma Volume/physiology
MH  - Water/metabolism
EDAT- 1992/02/01 00:00
MHDA- 1992/02/01 00:01
CRDT- 1992/02/01 00:00
PHST- 1992/02/01 00:00 [pubmed]
PHST- 1992/02/01 00:01 [medline]
PHST- 1992/02/01 00:00 [entrez]
AID - 10.1152/jappl.1992.72.2.468 [doi]
PST - ppublish
SO  - J Appl Physiol (1985). 1992 Feb;72(2):468-75. doi: 10.1152/jappl.1992.72.2.468.