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; 60 g × 500 ml−1, Na+ 205 mg × 500 ml−1), placebo-electrolyte (PL) or water (Wat) beverages at the end of the warm-up (250 ml) and half-time (250 ml 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 >1.5 m·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
Original language | English |
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Pages (from-to) | 1123-1129 |
Number of pages | 7 |
Journal | Journal of Science and Medicine in Sport |
Volume | 20 |
Issue number | 12 |
Early online date | 21 Apr 2017 |
DOIs | |
Publication status | Published - 1 Dec 2017 |
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Profiles
-
Liam Harper
- Department of Allied Health Professions, Sport and Exercise - Senior Lecturer - Sport Exercise and Nutrition Sciences
- School of Human and Health Sciences
- Centre for Applied Research in Health - Member
Person: Academic