The influence of caffeine ingestion on strength and power performance in female team-sport players
Ali A, O'Donnell J, Foskett A, Rutherfurd-Markwick K
Journal of the International Society of Sports Nutrition · 46 citations
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
Based on full-text disclosure statement.
Publication
- Published
- 2016-01-05 · J Int Soc Sports Nutr · vol. 13 · issue 1 · p. 46
- Publisher
- Springer Science+Business Media
- Cited
- 59 citations · more than 91% of similar papers · 3.1× the field average
- Impact
- Top 10% most cited in its field
- References
- 38 works
- Access
- Open access (journal) · CC-BY
- Research areas
- Coffee research and impacts · Muscle metabolism and nutrition · Hormonal and reproductive studies
- Keywords
- Medicine, Caffeine, Eccentric, Isometric exercise, Placebo, Physical therapy, Crossover study, Treadmill, Leg press, Internal medicine, Muscle strength
- MeSH
- knee, muscle, skeletal, humans, caffeine, placebos, exercise, cross-over studies, double-blind method, running, sports, adult, female, muscle strength, athletic performance, young adult
4 authors
From NZ
- Ajmol Ali · correspondingUniversity of Auckland; Massey University
- Jemma O’DonnellUniversity of Auckland; Massey University
- Andrew FoskettUniversity of Auckland; Massey University
- Kay Janice Rutherfurd-MarkwickUniversity of Auckland; Massey University
Abstract
Background
The aim of this study was to examine the influence of caffeine supplementation on knee flexor and knee extensor strength before, during and after intermittent running exercise in female team-sport players taking oral contraceptive steroids (OCS).
Method
Ten healthy females (24 ± 4 years; 59.7 ± 3.5 kg; undertaking 2-6 training sessions per week) taking low-dose monophasic oral contraceptives of the same hormonal composition took part in a randomised, double-blind, placebo-controlled crossover-design trial. Sixty minutes following the ingestion of a capsule containing 6 mg∙kg-1 body mass anhydrous caffeine or artificial sweetener (placebo), participants completed a 90-min intermittent treadmill-running protocol. Isometric strength performance and eccentric and concentric strength and power of the knee flexors and knee extensors (using isokinetic dynamometer), as well as countermovement jump (CMJ), was measured before, during and after the exercise protocol, as well as ~12 h post-exercise. Blood samples were taken before, during and post-exercise to measure glucose, insulin and free fatty acids (FFA).
Results
Caffeine supplementation significantly increased eccentric strength of the knee flexors (P P P P < 0.05) while levels of glucose and insulin were not affected by caffeine intake.
Conclusion
Caffeine supplementation increased eccentric strength and power in female team-sport players taking OCS both during an intermittent running protocol and the following morning.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
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