Tuesday, November 18, 2008

Flying 40 yard sprint!

JavaFit enhances exercise!!

The effects of a nutritionally enriched coffee drink on repeated flying 40-yd sprint performance
Jon-Kyle Davis , Matt Green, Matt Laurent, Nick Bacon and Whitney Thomas
Department of Kinesiology, The University of Alabama, Tuscaloosa, AL 35487, USA
International Society of Sports Nutrition Conference and ExpoLas Vegas, NV, USA. 9–10 June 2008
Journal of the International Society of Sports Nutrition 2008, 5(Suppl 1):P1doi:10.1186/1550-2783-5-S1-P1
The electronic version of this abstract is the complete one and can be found online at: http://www.jissn.com/content/5/S1/P1
17 September 2008
© 2008 Davis et al; licensee BioMed Central Ltd.
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.
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.
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).
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).

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