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Cited by 34

The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.

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

Ellis, Matthew, Noon, Mark, Myers, Tony, Clarke, Neil·2019·International Journal of Sports Physiology and Performance
DOI 10.1123/ijspp.2018-0536
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Abstract

Context : High doses of ∼6 mg·kg −1 body mass have improved performance during intermittent running, jumping, and agility protocols. However, there are sparse data on low doses of caffeine, especially in elite adolescent soccer players. Methods : A total of 15 elite youth soccer players (177.3 [4.8] cm, 66.9 [7.9] kg, and 16 [1] y) participated in the study, consuming 1, 2, or 3 mg·kg −1 caffeine in a gelatin capsule or a 2-mg·kg −1 placebo in a single-blind, randomized, crossover study design. Testing consisted of a 20-m sprint, arrowhead agility (change of direction [CoD] right or left), countermovement jump (CMJ), and Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IR1). Postexercise CMJ performance was assessed as participants exited the Yo-Yo IR1. Data were analyzed using a Bayesian multilevel regression model to provide explained variance and probabilities of improvement ( P = %). Results : Compared with placebo, 3 mg·kg −1 caffeine presented the highest probabilities of change across a range of tests (mean [SD], P = %). Times for 20-m sprint were 3.15 (0.10) s vs 3.18 (0.09) s ( P = 73%), CoD-right times were 8.43 (0.24) s vs 8.55 (0.25) s ( P = 99%), CoD-left times were 8.44 (0.22) s vs 8.52 (0.18) s ( P = 85%), Yo-Yo IR1 distance was 2440 (531) m vs 2308 (540) m ( P = 15%), and preexercise CMJ height was 41.6 (7.2) cm vs 38 (8.5) cm ( P = 96%). Postexercise CMJ was higher with 3 mg·kg −1 than with placebo (42.3 [8] cm vs 36.6 [8] cm; P = 100%). Doses of 1 or 2 mg·kg −1 caffeine also demonstrated the ability to enhance performance but were task dependent. Conclusion : Low doses of caffeine improve performance but are dose and task dependent. A dose of 3 mg·kg −1 caffeine improved performance across the majority of tests with potential to further improve postexercise CMJ height.

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Research works printed but not linked: 50

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Metadata

Authors
Ellis, M., Noon, M., Myers, T., & Clarke, N.
Venue
International Journal of Sports Physiology and Performance
Publisher
Human Kinetics
Published
2019-05-01
Volume
14
Issue
5
Pages
569-575
ISSN
  • 1555-0265
  • 1555-0273
DOI
10.1123/ijspp.2018-0536
Cited by
34
References
6

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