The influence of a 12% carbohydrate-electrolyte beverage on self-paced soccer-specific exercise performance

J Sci Med Sport. 2017 Dec;20(12):1123-1129. doi: 10.1016/j.jsams.2017.04.015. Epub 2017 Apr 21.

Abstract

Objectives: To assess the physiological and performance effects of a 12% carbohydrate-electrolyte beverage consumed at practically applicable time-points (i.e., before each half) throughout simulated soccer match-play.

Design: Randomised, counterbalanced, crossover.

Methods: Fed players (n=15) performed 90-min of soccer-specific exercise (including self-paced exercise at the end of each half). Players consumed carbohydrate-electrolyte (CHO; 60g×500ml-1, Na+ 205mg×500ml-1), placebo-electrolyte (PL) or water (Wat) beverages at the end of the warm-up (250ml) and half-time (250ml plus ad-libitum water). Blood was drawn before each half and every 15-min during exercise. Physical (15-m sprinting, countermovement jumps, self-paced distance, acceleration/deceleration count), technical (dribbling) and cognitive (memory, attention, decision-making) performance was assessed. Ratings of perceived exertion (RPE) and abdominal discomfort were measured.

Results: Against Wat and PL, CHO increased (all p<0.05) mean accelerations >1.5m·s-2 during self-paced exercise (>+25%) and dribbling speed from 60-min onwards (>+3%). Mean sprinting speed improved (+2.7%) in CHO versus Wat. Blood glucose increased before and during each half in CHO versus PL and Wat (all p<0.05). A 27% decline in glycaemia occurred at 60-min in CHO. RPE was comparable between trials. Cognition reduced post-exercise (p<0.05); this decline was not attenuated by CHO. Abdominal discomfort increased during exercise but was similar between trials.

Conclusions: Using more realistic fluid ingestion timings than have been examined previously, consuming a 12% carbohydrate-electrolyte beverage increased blood glucose, self-paced exercise performance, and improved dribbling speed in the final 30-min of exercise compared to water and placebo. Carbohydrates did not attenuate post-exercise reductions in cognition.

Keywords: Football; Isomaltulose; Maltodextrin; Skill; Sucrose.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Athletes
  • Athletic Performance / physiology*
  • Beverages*
  • Blood Glucose / analysis
  • Cognition
  • Cross-Over Studies
  • Dietary Carbohydrates / administration & dosage*
  • Electrolytes / administration & dosage*
  • Humans
  • Male
  • Soccer / physiology*
  • Sports Nutritional Physiological Phenomena*
  • Young Adult

Substances

  • Blood Glucose
  • Dietary Carbohydrates
  • Electrolytes