http://www.nutritionandmetabolism.com/content/6/1/9
Effect of beverage glucose and sodium
content on fluid delivery
Asker E Jeukendrup, Kevin Currell, Juliette Clarke, Johnny Cole
and Andrew K Blannin
School of Sport and Exercise Sciences, University of Birmingham,
Edgbaston, Birmingham, UK
Background: Rapid fluid delivery from ingested beverages is the goal of oral
rehydration solutions (ORS) and sports drinks. Objective: The aim of the present
study was to investigate the effects of increasing carbohydrate and sodium content
upon fluid delivery using a deuterium oxide (D2O) tracer.
Design: Twenty healthy
male subjects were divided into two groups of 10, the first group was a carbohydrate
group (CHO) and the second a sodium group (Na). The CHO group ingested four
different drinks with a stepped increase of 3% glucose from 0% to 9% while sodium
concentration was 20 mmol/L. The Na group ingested four drinks with a stepped
increase of 20 mmol/L from 0 mmol/L to 60 mmol/l while glucose concentration was
6%. All beverages contained 3 g of D2O. Subjects remained seated for two hours
after ingestion of the experimental beverage, with blood taken every 5 min in the first
hour and every 10 min in the second hour.
Results: Including 3% glucose in the
beverage led to a significantly greater AUC 60 min (19640 ± 1252 ‰ vs.
VSMOW.60min) than all trials. No carbohydrate (18381 ± 1198 ‰ vs.
VSMOW.60min) had a greater AUC 60 min than a 6% (16088 ± 1359 ‰ vs.
VSMOW.60min) and 9% beverage (13134 ± 1115 ‰ vs. VSMOW.60min); the 6%
beverage had a significantly greater AUC 60min than the 9% beverage. There was
no difference in fluid delivery between the different sodium beverages.
Conclusion:
In conclusion the present study showed that when carbohydrate concentration in an
ingested beverage was increased above 6% fluid delivery was compromised.
However, increasing the amount of sodium (0-60 mmol/L) in a 6% glucose beverage
did not lead to increases in fluid delivery.
Pour le glucose c'est donc 6 g pour 100 ml au max soit 30 g pour 500 ml
Mais dans cette expérience les sujets sont à jeun. Est ce que ces recommandations sont-elles valables si, avant l'entrainement, on consomme une collation ?
