title: The effects of ingesting a carbohydrate-electrolyte beverage 15 minutes prior to high-intensity exercise performance.
abstract: The aim of this study was to examine the effect of ingesting a commercially available carbohydrate-electrolyte (CHO-E) solution on strenuous exercise performance. Ten apparently healthy male volunteers (Mean +/- SD; age 20 +/- 2 yrs; height 178 +/- 7 cm; body mass 77 +/- 10 kg; estimated VO(2 max) 56 +/- 3 ml x kg(-1) x min(-1) completed three experimental trials in random order separated by a minimum of 7 days. For each trial, subjects consumed (8 ml x kg(-1) body mass) either a CHO-E solution (6% carbohydrate, 50 mg Na/500 ml), a non-CHO-E placebo, or no fluid, 15 minutes prior to exercise. The exercise involved intermittent shuttle (20 m apart) running for 1 hr followed by an incremental shuttle running test to exhaustion. Subjects displayed longer exercise times when the CHO-E solution was ingested compared with placebo or no fluid groups (exercise time to exhaustion - CHO-E 649 +/- 95 s, vs. placebo 601 +/- 83 s, vs. no fluid 593 +/- 107 s, P < 0.05). There was a main effect for time for specific gravity of urine (P < 0.05 vs. postexercise, pooled data) and body mass (P < 0.05 vs. postexercise, pooled data). The main finding from this investigation indicates that drinking a CHO-E solution 15 minutes prior to exercise improves performance. This study has practical implications for those sports where drinking during activity is restricted.
authors.affiliation: Sport and Exercise Sciences Research Institute, University of Ulster at Jordanstown, Belfast, United Kingdom. gw.davison@ulster.ac.uk
authors.forename: G W
authors.initials: GW
authors.lastname: Davison
authors.forename: C
authors.initials: C
authors.lastname: McClean
authors.forename: J
authors.initials: J
authors.lastname: Brown
authors.forename: S
authors.initials: S
authors.lastname: Madigan
authors.forename: D
authors.initials: D
authors.lastname: Gamble
authors.forename: T
authors.initials: T
authors.lastname: Trinick
authors.forename: E
authors.initials: E
authors.lastname: Duly
mesh_terms: D000328:Adult; D001628:Beverages; D004040:Dietary Carbohydrates / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D005082:Physical Exertion / Q000187:drug effects* / Q000502:physiology; D015532:Rehydration Solutions / Q000378:metabolism / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D004040:Dietary Carbohydrates; D015532:Rehydration Solutions