title: Beverage carbohydrate concentration influences the intermittent endurance capacity of adolescent team games players during prolonged intermittent running.
abstract: This study investigated the influence of consuming a 2, 6, and 10% carbohydrate-electrolyte (CHO-E) solution on the intermittent endurance capacity and sprint performance of adolescent team games players. Seven participants (five males and two females; mean age 13.3 ± 0.5 years, height 1.71 ± 0.05 m, body mass (BM) 62.0 ± 6.3 kg) performed three trials separated by 3-7 days. In each trial, they completed four 15-min periods of part A of the Loughborough Intermittent Shuttle Test (LIST) followed by an intermittent run to exhaustion (part B). Participants consumed 5 ml kg(-1) BM of the solution during the 5-min pre-exercise period, and a further 2 ml kg(-1) BM every 15 min during part A of the LIST. Intermittent endurance capacity increased by 34% with ingestion of the 6% CHO-E solution compared with the 10% solution (5.5 ± 0.8 vs. 4.1 ± 1.5 min, P < 0.05), equating to a distance of 931 ± 172 versus 706 ± 272 m (P < 0.05). There was no significant difference between the 2% (4.8 ± 1.2 min) and 6% (P = 0.10) or the 2 and 10% solutions (P = 0.09). Carbohydrate concentration did not significantly influence mean 15-m sprint time (P = 0.38). These results suggest that the carbohydrate concentration of an ingested solution influences the intermittent endurance capacity of adolescent team games players with a 6% solution significantly more effective than a 10% solution.
authors: Institute of Sport, Physical Education and Health Sciences, University of Edinburgh, St Leonards Land, Holyrood Road, Edinburgh, EH8 8AQ, UK. S.M.Phillips@sms.ed.ac.uk
authors: Shaun M
authors: SM
authors: Phillips
authors: Anthony P
authors: AP
authors: Turner
authors: Mark F
authors: MF
authors: Sanderson
authors: John
authors: J
authors: Sproule
mesh_terms: D000293:Adolescent; D001628:Beverages / Q000032:analysis; D002648:Child; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000032:analysis / Q000494:pharmacology*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D009994:Osmolar Concentration; D010507:Periodicity; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D010988:Play and Playthings; D012420:Running / Q000502:physiology; D012916:Soccer / Q000502:physiology; D013997:Time Factors
chemical_list: D004040:Dietary Carbohydrates