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Caffeinated Energy Drinks Improve Volleyball Performance in Elite Female Players.
- Source :
-
Medicine & Science in Sports & Exercise . Apr2015, Vol. 47 Issue 4, p850-856. 7p. - Publication Year :
- 2015
-
Abstract
- Purpose: The objective of this study is to determine the effects of a caffeine-containing energy drink on female volleyball players' performance. Methods: Thirteen elite female volleyball players ingested 3 mg·kg-1 of caffeine with an energy drink or the same drink without caffeine (placebo drink) in a double-blind and randomized study. Then, participants performed the following: standing spike, jumping spike, spike jump, blocking jump, squat jump, counter movement jump, manual dynamometry, and the agility t-test. A simulated volleyball game was played, videotaped, and notated afterward. Results: In comparison to the placebo drink, the ingestion of the caffeinated energy drink increased the ball velocity in the standing spike (19.2 ± 2.1 vs 19.7 ± 1.9 m.s-1, P = 0.023) and in the jumping spike (17.9 ± 2.2 vs 18.8 ± 2.2 m.s-1, P = 0.038) and the jump height in the squat jump (28.1 ± 3.2 vs 29.4 ± 3.6 cm, P = 0.028), countermovement jump (32.0 ± 4.6 vs 33.1 ± 4.5 cm, P = 0.018), spike jump (43.3 ± 4.7 vs 44.4 ± 5.0 cm, P = 0.025), and block jump (35.2 ± 5.1 vs 36.1 ± 5.1 cm, P = 0.044). Furthermore, the caffeinated energy drink decreased the time needed to complete the agility t-test (11.1 ± 0.5 vs 10.9 ± 0.3 s, P = 0.036). During the game, the volleyball actions categorized as successful were more frequent with the caffeinated energy drink (34% ± 9% vs 45% ± 9%, P < 0.001), whereas imprecise actions decreased (28% ± 7% vs 14% ± 9%, P < 0.001) when compared with the placebo drink. Conclusion: Commercially available energy drinks can significantly improve physical performance in female volleyball players. Increased physical performance led to improved accuracy during an actual volleyball match. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ATHLETIC ability
*BEVERAGES
*BODY weight
*CAFFEINE
*CONFIDENCE intervals
*EXERCISE tests
*JUMPING
*MUSCLE contraction
*STATURE
*T-test (Statistics)
*VOLLEYBALL
*DATA analysis
*EFFECT sizes (Statistics)
*ERGOGENIC aids
*RANDOMIZED controlled trials
*ELITE athletes
*BLIND experiment
*DATA analysis software
*DESCRIPTIVE statistics
Subjects
Details
- Language :
- English
- ISSN :
- 01959131
- Volume :
- 47
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Medicine & Science in Sports & Exercise
- Publication Type :
- Academic Journal
- Accession number :
- 101653737
- Full Text :
- https://doi.org/10.1249/MSS.0000000000000455