التفاصيل البيبلوغرافية
| العنوان: |
The Acute Effect of Whole Body Vibration on 30 Meter Fly Sprint Performance in NCAA Division I Sprinters and Jumpers. |
| المؤلفون: |
Kavanaugh, A A, Ramsey, M W, Williams, D A, Haff, G G, Sands, W A, Stone, M H |
| المصدر: |
Journal of Strength & Conditioning Research; 2011 Supplement, Vol. 25, pS43-S44, 2p, 1 Chart |
| مستخلص: |
The present study focuses on 45 meter (M) sprint performance. Sprinting involves optimal motoneuron excitability as well as the ability to recruit fast twitch muscle fibers. Some research suggests that WBV (whole body vibration) may positively influence performance acutely through potentiation of the muscle's series elastic components and neuromuscular mechanisms. It has also been suggested that the recruitment threshold of motor units are lower during vibration as opposed to voluntary contractions, which could result in a more rapid activation of high-threshold fast twitch motor units. PURPOSE: The purpose of this research was to examine the acute affects of WBV on 45 M sprint performance in NCAA Division I collegiate sprinters and jumpers. METHODS: Twenty-six subjects (M = 21, F = 5) completed the WBV protocol, which consisted of one 30 second WBV bout at 50 Hz, low amplitude (∼3 mm) and 60 seconds rest before a 30 M fly sprint (total distance = 45 M). The vibration-sprint protocol was repeated after a five minute rest period following the first sprint (test-re-test ICCα ≥0.93). Each subject participated in three separate trials using randomized treatment sessions over three months of preparation training prior to the indoor season. Treatment-1 (Tr-1) consisted of no vibration and treatment 2 (Tr-2) and treatment 3 (Tr-3) incorporated vibration. Two vibration treatments were used to investigate the potential consistency of WBV on sprinting. Sprint speed was measured through the use of timing gates. The sprint consisted of a 15 M run-in from a standing start and a 30 M flying sprint. Timing gates were positioned at 0m, 15 M, 30 M and 45 M. Statistical analyses: one-way repeated measures ANOVA (p≤0.05) was used to compare treatment and trial effects. RESULTS: Statistics comparing the average sprint time of treatments 1 vs. 2, 1 vs. 3, and 2 vs. 3 showed no treatment effects. However, there was a statistically different time effect indicating an improved sprinting ability as a result of training (Table 1). CONCLUSION: The results of this study indicate that WBV at 50 Hz and low amplitude has no effect on sprint times (15 M, 30 M or 45 M). Further research is needed to determine specific WBV protocols (frequency, amplitude, timing, etc.) that may elicit enhanced results in 30 meter fly sprint performance. PRACTICAL APPLICATION: Using the present protocol, WBV does not appear to have practical acute value for sprinting. ACKNOWLEDGEMENTS: A special thanks to Power Plate International for supplying the WBV plates.Table 1: Effect of Vibration on Sprint Times [ABSTRACT FROM AUTHOR] |
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