Effects of isomaltulose ingestion on postexercise hydration state and heat loss responses in young men.
Beverages
Bicycling
/ physiology
Body Temperature
/ drug effects
Body Temperature Regulation
/ drug effects
Body Water
/ drug effects
Body Weight
Cross-Over Studies
Dietary Carbohydrates
/ pharmacology
Exercise
/ physiology
Fluid Therapy
/ methods
Heart Rate
Humans
Isomaltose
/ analogs & derivatives
Male
Osmolar Concentration
Plasma Volume
Single-Blind Method
Sweating
/ drug effects
Urodynamics
Water-Electrolyte Balance
Young Adult
carbohydrate drink
postexercise thermoregulation
rehydration
Journal
Experimental physiology
ISSN: 1469-445X
Titre abrégé: Exp Physiol
Pays: England
ID NLM: 9002940
Informations de publication
Date de publication:
10 2019
10 2019
Historique:
received:
09
05
2019
revised:
07
08
2019
accepted:
08
08
2019
pubmed:
11
8
2019
medline:
8
8
2020
entrez:
11
8
2019
Statut:
ppublish
Résumé
What is the central question of this study? What are the effects of isomaltulose, an ingredient in carbohydrate-electrolyte beverages to maintain glycaemia and attenuate the risk of dehydration during exercise heat stress, on postexercise rehydration and physiological heat loss responses? What is the main finding and its importance? Consumption of a 6.5% isomaltulose-electrolyte beverage following exercise heat stress restored hydration following a 2 h recovery as compared to a 2% solution or water only. While the 6.5% isomaltulose-electrolytes increased plasma volume and plasma osmolality, which are known to modulate postexercise heat loss, sweating and cutaneous vascular responses did not differ between conditions. Consequently, ingestion beverages containing 6.5% isomaltulose-electrolytes enhanced postexercise rehydration without affecting heat loss responses. Isomaltulose is a disaccharide carbohydrate widely used during exercise to maintain glycaemia and hydration. We investigated the effects of ingesting a beverage containing isomaltulose and electrolytes on postexercise hydration state and physiological heat loss responses. In a randomized, single-blind cross-over design, 10 young healthy men were hypohydrated by performing up to three 30 min successive moderate-intensity (50% heart rate reserve) bouts of cycling, each separated by 10 min, while wearing a water-perfusion suit heated to 45°C. The protocol continued until a 2% reduction in body mass was achieved. Thereafter, participants performed a final 15 min moderate-intensity exercise bout followed by a 2 h recovery. Following cessation of exercise, participants ingested a beverage consisting of (i) water only (Water), (ii) 2% isomaltulose (CHO-2%), or (iii) 6.5% isomaltulose (CHO-6.5%) equal to the volume of 2% body mass loss within the first 30 min of the recovery. Changes in plasma volume (ΔPV) after fluid ingestion were greater for CHO-6.5% compared with CHO-2% (120 min postexercise) and Water (90 and 120 min) (all P ≤ 0.040). Plasma osmolality remained elevated with CHO-6.5% compared with consumption of the other beverages at 30 and 90 min postexercise (all P ≤ 0.050). Urine output tended to be reduced with CHO-6.5% compared to other fluid conditions (main effect, P = 0.069). Rectal and mean skin temperatures, chest sweat rate and cutaneous perfusion did not differ between conditions (all P > 0.05). In conclusion, compared with CHO-2% and Water, consuming a beverage consisting of CHO-6.5% and electrolytes during recovery under heat stress enhances PV recovery without modulating physiological heat loss responses.
Substances chimiques
Dietary Carbohydrates
0
Isomaltose
67I334IX2M
isomaltulose
V59P50X4UY
Types de publication
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1494-1504Subventions
Organisme : Bourbon Corporation
Pays : International
Organisme : Japan Society for the Promotion of Science
ID : 18H03146
Pays : International
Informations de copyright
© 2019 The Authors. Experimental Physiology © 2019 The Physiological Society.
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