Effects of carbohydrate-hydration strategies on glucose metabolism, sprint performance and hydration during a soccer match simulation in recreational players

Kingsley, Michael, Penas-Ruiz, Carlos, Terry, Chris and Russell, Mark (2014) Effects of carbohydrate-hydration strategies on glucose metabolism, sprint performance and hydration during a soccer match simulation in recreational players. Journal of Science and Medicine in Sport, 17 (2). pp. 239-243. ISSN 1440-2440

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Official URL: http://dx.doi.org/10.1016/j.jsams.2013.04.010

Abstract

Objectives
This study compared the effects of three carbohydrate-hydration strategies on blood glucose concentration, exercise performance and hydration status throughout simulated soccer match-play.

Design
A randomized, double-blind and cross-over study design was employed.

Methods
After familiarization, 14 recreational soccer players completed the soccer match simulation on three separate occasions. Participants consumed equal volumes of 9.6% carbohydrate–caffeine–electrolyte (∼6 mg/kg BW caffeine) solution with carbohydrate–electrolyte gels (H-CHO), 5.6% carbohydrate–electrolyte solution with electrolyte gels (CHO) or electrolyte solution and electrolyte gels (PL). Blood samples were taken at rest, immediately before exercise and every 15 min during exercise (first half: 15, 30, 45 min; second half: 60, 75, 90 min).

Results
Supplementation influenced blood glucose concentration (time × treatment interaction: p < 0.001); however, none of the supplementation regimes were effective in preventing a drop in blood glucose at 60 min. Mean sprint speed was 3 ± 1% faster in H-CHO when compared with PL (treatment: p = 0.047). Supplementation caused a 2.3 ± 0.5% increase in plasma osmolality in H-CHO (p < 0.001) without change in CHO or PL. Similarly, mean sodium concentrations were 2.1 ± 0.4% higher in H-CHO when compared with PL (p = 0.006).

Conclusions
Combining high carbohydrate availability with caffeine resulted in improved sprint performance and elevated blood glucose concentrations throughout the first half and at 90 min of exercise; however, this supplementation strategy negatively influenced hydration status when compared with 5.6% carbohydrate–electrolyte and electrolyte solutions.

Item Type: Article
Uncontrolled Keywords: supplementation, football, shooting, rebound hypoglycemia
Subjects: B400 Nutrition
C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Ay Okpokam
Date Deposited: 24 Apr 2014 08:53
Last Modified: 10 Aug 2015 11:28
URI: http://nrl.northumbria.ac.uk/id/eprint/16105

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