Ingesting a 6% carbohydrate-electrolyte solution improves endurance capacity, but not sprint performance, during intermittent, high-intensity shuttle running in adolescent team games players aged 12-14 years.
The main aim of this study was to investigate the influence of consuming a 6% carbohydrate-electrolyte (CHO-E) solution on the intermittent, high-intensity endurance performance and capacity of adolescent team games players. Fifteen participants (mean age 12.7 +/- 0.8 years) performed two trials separated by 3-7 days. In each trial, they completed 60 min of exercise composed of four 15-min periods of part A of the Loughborough Intermittent Shuttle Test, followed by an intermittent run to exhaustion (part B). In a double-blind, randomised, counterbalanced fashion participants consumed either the 6% CHO-E solution or a non-carbohydrate (CHO) placebo (5 ml kg(-1) BM) during the 5 min pre-trial and after each 15-min period of part A (2 ml kg(-1) BM). Time to fatigue was increased by 24.4% during part B when CHO was ingested (5.1 +/- 1.8 vs. 4.1 +/- 1.6 min, P < 0.05), with distance covered in part B also significantly greater in the CHO trial (851 +/- 365 vs. 694 +/- 278 m, P < 0.05). No significant between-trials differences were observed for mean 15-m sprint time (P = 0.35), peak sprint time (P = 0.77), or heart rate (P = 0.08) during part A. These results demonstrate, for the first time, that ingestion of a CHO-E solution significantly improves the intermittent, high-intensity endurance running capacity of adolescent team games players during an exercise protocol designed to simulate the physiological demands of team games.
Phillips
Shaun M
SM
Department of Physical Education, Sport and Leisure Studies, University of Edinburgh, St Leonards Land, Holyrood Road, Edinburgh, EH8 8AQ, UK. S.M.Phillips@sms.ed.ac.uk
Turner
Anthony P
AP
Gray
Shirley
S
Sanderson
Mark F
MF
Sproule
John
J
D000284:Administration, Oral; D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D015992:Body Mass Index; D002648:Child; D003627:Data Interpretation, Statistical; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004311:Double-Blind Method; D004573:Electrolytes / Q000494:pharmacology*; D017079:Exercise Tolerance / Q000187:drug effects / Q000502:physiology; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D012420:Running / Q000502:physiology*; D012727:Sex Characteristics; D013997:Time Factors
D004040:Dietary Carbohydrates; D004573:Electrolytes