Effects of caffeinated gum on a battery of soccer-specific tests in trained university-standard male soccer players

RANCHORDAS, Mayur, KING, George, RUSSELL, Mitchell, LYNN, Tony and RUSSELL, Mark (2018). Effects of caffeinated gum on a battery of soccer-specific tests in trained university-standard male soccer players. International Journal of Sport Nutrition & Exercise Metabolism. (In Press)

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Link to published version:: 10.1123/ijsnem.2017-0405

Abstract

The purpose of this study was to determine whether caffeinated gum influenced performance in a battery of soccer-specific tests used in the assessment of performance in soccer players. In a double blind, randomised, cross-over design, ten male university-standard soccer players (age 19 ± 1 y, stature 1.80 ± 0.10 m, body mass 75.5 ± 4.8 kg) masticated a caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum on two separate occasions. After a standardised warm-up, gum was chewed for 5 min and subsequently expectorated 5 min before players performed a maximal countermovement jump, a 20 m sprint test and the Yo-Yo intermittent recovery test level 1 (Yo-YoIR1). Performance on 20 m sprints were not different between trials (caffeine: 3.2 ± 0.3 s, placebo: 3.1 ± 0.3 s; p = 0.567; small effect size: d = 0.33), but caffeine did allow players to cover 2.0% more distance during Yo-YoIR1 (caffeine: 1754 ± 156 m, placebo: 1719 ± 139 m; p = 0.016; small effect size: d = 0.24) and increase maximal countermovement jump height by 2.2% (caffeine: 47.1 ± 3.4 cm, placebo: 46.1 ± 3.2 cm; p = 0.008; small effect size: d = 0.30). Performance on selected physical tests (Yo-YoIR1 and countermovement jump) was improved by the chewing of caffeinated gum in the immediate period before testing in university-standard soccer players but the sizes of such effects were small. Such findings may have implications for the recommendations made to soccer players about to engage with subsequent exercise performance.

Item Type: Article
Departments: Health and Well-being > Sport
Sheffield Business School > Service Sector Management
Identification Number: 10.1123/ijsnem.2017-0405
Depositing User: Jill Hazard
Date Deposited: 22 Feb 2018 14:05
Last Modified: 21 May 2018 02:35
URI: http://shura.shu.ac.uk/id/eprint/18752

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