Author: Bush JA1, Blog GL, Kang J, Faigenbaum AD, Ratamess NA.
Affiliation: 11Department of Health and Exercise Science, The College of New Jersey, Ewing, New Jersey 2Department of Health and Human Performance, University of Houston, Houston, Texas.
Conference/Journal: J Strength Cond Res.
Date published: 2014 Sep 29
Other: Word Count: 306
Numerous studies have shown performance benefits from including whole-body vibration (WBV) whether as a training modality or an acute exercise protocol when utilized as a component of the resistance training program. Some studies have indicated that performing dynamic exercises as compared to static position exercises while exposed to WBV might be beneficial, however, evidence is lacking. Thus, the purpose of this study was to determine if an acute bout of dynamic vs. static squats performed during WBV results in increases in quadriceps force production via dynamic isokinetic knee extension and flexion exercise.
Non-resistance-trained healthy young men and women (N=21) 18-25 yrs participated in 4 protocols with 2 wk rest in-between. Protocol 1 consisted of 5 sets of 10 dynamic squats without vibration; Protocol 2: 5 sets of 30-sec static squats without vibration; Protocol 3: 5 sets of 10 dynamic squats with 30 Hz WBV for total of 2.5 min; and Protocol 4: 5 sets of 30-sec static squats with 30 Hz WBV for total of 2.5 min. Pre-strength tests (1 set of 4 repetitions at 100°/sec for the knee extension exercise) was performed within 5 min of starting each protocol and post-strength testing was performed within 1 min of completing each protocol. Strength outcomes were analyzed via repeated measures ANOVA with a significance level set at p≤0.05.
A significant decrease in strength was observed after dynamic and static squats without WBV (p=0.002); an increase in strength after dynamic squats with WBV (p=0.003); and a decrease in strength after static squats with WBV (p=0.003).
The inclusion of WBV to dynamic resistance exercise can be an added modality to increase strength. WBV can have varied effects in altering muscle strength in untrained individuals according to the type of resistance training performed.
As a dynamic squat with WBV appears to immediately potentiate neuromuscular functioning, the combination of dynamic exercises and WBV could be utilized as a potential warm-up procedure prior to resistance exercise.