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

May 10, 2017Journal of science and medicine in sport

How a 12% carbohydrate drink affects self-paced soccer exercise performance

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Abstract

Consuming a 12% carbohydrate-electrolyte beverage increased self-paced exercise performance by over 25% compared to water.

Carbohydrate-electrolyte beverage improved mean accelerations during self-paced exercise and dribbling speed from 60 minutes onward.
Sprinting speed was enhanced by 2.7% when compared to water.
Blood glucose levels increased before and during each half with the carbohydrate beverage compared to placebo and water.
A 27% decline in blood sugar occurred at 60 minutes during the consumption of the carbohydrate beverage.
Ratings of perceived exertion were similar across all trials, indicating no difference in effort perceived by participants.
Cognitive performance declined post-exercise, and this decline was not mitigated by carbohydrate consumption.

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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, Na205mg×500ml), 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. -1 + -1

RESULTS: Against Wat and PL, CHO increased (all p<0.05) mean accelerations >1.5m·sduring 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. -2

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.

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

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