Low Doses of Caffeine: Enhancement of Physical Performance in Elite Adolescent Male Soccer Players

Ellis, Matthew, Noon, Mark, Myers, Tony and Clarke, Neil (2018) Low Doses of Caffeine: Enhancement of Physical Performance in Elite Adolescent Male Soccer Players. International Journal of Sports Physiology and Performance. pp. 1-21. ISSN 1555-0265

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Abstract

Purpose: Large doses of ~6 mgkg-1 body mass (BM) have improved performance during intermittent running, jumping and agility protocols. However, there is sparse data on low doses of caffeine especially in elite adolescent soccer players. Method: 15 elite youth soccer players (177.3±4.8 cm, 66.9±7.9 kg and 16±1 yr) participated in the study. Participants consumed 1, 2 or 3 mgkg-1 caffeine in a gelatin capsule or a 2 mgkg-1 placebo in a single blind, randomised, crossover study design. Testing consisted of a 20 m sprint, arrowhead agility (CoD R or L), counter-movement jump (CMJ) and Yo-Yo intermittent recovery test level-1 (Yo-Yo IR1). Post-exercise CMJ performance was assessed as participants exited Yo-Yo IR1. Data were analysed using a Bayesian multi-level regression model to provide explained variance and probabilities of improvement (p=%). Results: 3 mgkg-1 caffeine presented the highest probabilities of change compared to placebo across a range of tests (mean ± SD, p= %). 20m sprint times were 3.15±0.10s vs 3.18±0.09s (p=73%), CoD-R times were 8.43±0.24s vs 8.55±0.25s (p=99%), CoD-L times were 8.44±0.22s vs 8.52±0.18s (p=85%), Yo-Yo IR1 distance were 2440±531m vs 2308±540m (p=15%), pre-exercise CMJ height was 41.6±7.2cm vs 38±8.5cm (p=96%). Post-exercise CMJ was higher in the 3 mgkg-1 compared to placebo (42.3±8cm vs 36.6±8cm [p=100%]). 1-2 mgkg-1 caffeine also demonstrated the ability to enhance performance but are task dependent. Conclusion: Low doses of caffeine improve performance but are dose and task dependent. 3 mgkg-1 caffeine improved performance across the majority of tests with potential to further improve post-exercise CMJ height.

Item Type:	Article
Additional Information:	Accepted author manuscript version reprinted, by permission, from International Journal of Performance Analysis in Sport 2018, doi: 10.1123/ijspp.2018-0536 © Human Kinetics, Inc.
Divisions:	Faculty of of Arts, Society and Professional Studies > Department of Health and Behavioural Sciences
Depositing User:	Ms Hazel Barham
Date Deposited:	25 Oct 2018 08:56
Last Modified:	18 Jul 2019 13:55
URI:	https://newman.repository.guildhe.ac.uk/id/eprint/17238

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