title: Strategies for hydration and energy provision during soccer-specific exercise.
abstract: The aim of the present study was to investigate the effect of manipulating the provision of sports drink during soccer-specific exercise on metabolism and performance. Soccer players (N = 12) performed a soccer-specific protocol on three occasions. On two, 7 mL/kg carbohydrate-electrolyte (CHOv) or placebo (PLA) solutions were ingested at 0 and 45 min. On a third, the same total volume of carbohydrate-electrolyte was consumed (CHOf) in smaller volumes at 0, 15, 30, 45, 60, and 75 min. Plasma glucose, glycerol, non-esterified free fatty acids (NEFA), cortisol, and CHO oxidation were not significantly different between CHOv and CHOf (P > 0.05). Sprint power was not significantly affected (P > 0.05) by the experimental trials. This study demonstrates when the total volume of carbohydrate consumed is equal, manipulating the timing and volume of ingestion elicits similar metabolic responses without affecting exercise performance.
authors.affiliation: Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, UK.
authors.forename: N D
authors.initials: ND
authors.lastname: Clarke
authors.forename: B
authors.initials: B
authors.lastname: Drust
authors.forename: D P M
authors.initials: DP
authors.lastname: MacLaren
authors.forename: T
authors.initials: T
authors.lastname: Reilly
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001786:Blood Glucose / Q000378:metabolism; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage* / Q000378:metabolism; D004311:Double-Blind Method; D004326:Drinking; D004573:Electrolytes / Q000008:administration & dosage* / Q000378:metabolism; D002149:Energy Intake; D004734:Energy Metabolism / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005990:Glycerol / Q000097:blood; D006801:Humans; D008297:Male; D009751:Nutritional Requirements; D010084:Oxidation-Reduction; D012916:Soccer / Q000502:physiology*; D013997:Time Factors
chemical_list: D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004573:Electrolytes; D005230:Fatty Acids, Nonesterified; D005990:Glycerol