Carbohydrate-gel supplementation and endurance performance during intermittent high-intensity shuttle running.
The aim of this study was to investigate the effects of a carbohydrate (CHO) gel on performance after prolonged intermittent high-intensity shuttle running. Seven male soccer players performed 2 exercise trials, 7 d apart. On each occasion, participants completed five 15-min periods of intermittent variable-speed running, interspersed with periods of walking (Part A), followed by an intermittent run to exhaustion (Part B). Participants consumed either a CHO gel or placebo (PLA) immediately before exercise (0.89 mL/kg body mass [BM]) and every 15 min thereafter (0.35 mL/kg BM). In addition, water was consumed at a rate of 5 mL/kg BM before and 2 mL/kg BM every 15 min during exercise. Blood glucose levels were higher (P < 0.05) at 15, 30, and 60 min of exercise and at exhaustion in CHO than in PLA. During Part B, run time to exhaustion was longer (P < 0.05) in the CHO trial (CHO 6.1 +/- 1.3 min vs. PLA 4.2 +/- 1.2 min). These results indicate that ingesting a CHO gel, along with water, improves performance after prolonged intermittent running in healthy male subjects, possibly by maintaining blood glucose levels during exercise.
Patterson
Stephen D
SD
School of Life Sciences, Napier University, Edinburgh, UK.
Gray
Susan C
SC
D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D002241:Carbohydrates / Q000494:pharmacology*; D018592:Cross-Over Studies; D019587:Dietary Supplements; D004326:Drinking / Q000502:physiology*; D005782:Gels; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D012420:Running / Q000502:physiology*; D013997:Time Factors
D001786:Blood Glucose; D002241:Carbohydrates; D005782:Gels