This article is part of the supplement: Proceedings of the Fifth International Society of Sports Nutrition (ISSN) Conference and Expo
Poster presentation
The effects of a nutritionally enriched coffee drink on repeated flying 40-yd sprint performance
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* Corresponding author: Jon-Kyle Davis davisjk7@yahoo.com
Department of Kinesiology, The University of Alabama, Tuscaloosa, AL 35487, USA
Journal of the International Society of Sports Nutrition 2008, 5(Suppl 1):P1 doi:10.1186/1550-2783-5-S1-P1
The electronic version of this article is the complete one and can be found online at: http://www.jissn.com/content/5/S1/P1
| Published: | 17 September 2008 |
© 2008 Davis et al; licensee BioMed Central Ltd.
Background
A double-blind, placebo controlled, randomized trial was performed to evaluate the effects of a nutritionally enriched coffee (NEC) drink compared to decaffeinated coffee (DC) on repeated flying 40-yard sprint performance.
Methods
Physically active male and female volunteers (n = 13) completed 24 × 50 yard sprints following NEC and DC (counterbalanced). Sprints were completed in 2 halves (12 sprints per half) with 2 minutes recovery between each sprint and a 10-minute recovery period between halves. Acute-RPE (A-RPE) (0–10 omni scale) was recorded after every sprint and Session RPE (S-RPE) was recorded 20 min after completing each trial. Blood lactate ([LA]) was recorded at baseline and following sprints, 6, 12, 18, and 24. Additionally, a fatigue index (FI) was calculated as a percentage difference between mean sprint time and fastest sprint time.
Results
A 2 (trial) × 2 (treatment) repeated measures ANOVA revealed significantly (p = 0.03) faster (main effect) sprint time for NEC. Post-hoc analyses revealed significantly faster times (p ≤ 0.05) for sprints 1, 3, 4, 6, 8, and 17, while approaching significance at sprints 10 (p = 0.07) and 15 (p = 0.08). No main effect for A-RPE (p = 0.28) or [LA] (p = 0.15) was found. Results from a paired t-test revealed a significantly improved FI (p = 0.04) with NEC but no significant impact on S-RPE (p = 0.72).
Conclusion
Results indicate that caffeine administered in a NEC drink can enhance repeated bouts of acute sprint performance possibly through delayed fatigue as evidenced in a dampened perceived exertion response (faster sprints with similar RPE).
Acknowledgements
Supported by Javalution Coffee Company Ft. Lauderdale, FL, USA.