Author: Manimmanakorn N, Hamlin MJ, Ross JJ, Manimmanakorn A.
Affiliation: Department of Rehabilitation Medicine, Faculty of Medicine, KhonKaen University, KhonKaen 40002 Thailand Telephone and Fax: +66 43 348392 E-mail: firstname.lastname@example.org Department of Social Science, Parks, Recreation, Tourism & Sport, PO Box 84 Lincoln University, Lincoln, 7647, Christchurch, New Zealand, Telephone +64 3 325 3838 ext 8565 Fax: +64 3 325 3857, E-mail: email@example.com Department of Social Science, Parks, Recreation, Tourism & Sport, PO Box 84 Lincoln University, Lincoln, 7647, Christchurch, New Zealand, Telephone +64 3 325 2811 Fax: +64 3 325 3857, E-mail: firstname.lastname@example.org Department of Physiology, Faculty of Medicine, KhonKaen University, KhonKaen 40002 Thailand Telephone and Fax: +66 43 348394 E-mail: email@example.com.
Conference/Journal: J Strength Cond Res.
Date published: 2013 Nov 22
Other: Word Count: 254
Whole body vibration (WBV) is widely promoted as a means of improving muscle strength, but the evidence of a performance benefit is unclear with some reporting improvements and others finding none. The objective of this study is to analyze the current evidence for the effectiveness of WBV on jump height. We included randomized controlled trials or matched design studies comparing the effect of WBV training on countermovement and squat jump height, which were gathered from MEDLINE, Web of Knowledge, Sciencedirect, Proquest, Scopus, Google Scholar and SPORTDiscus databases. The overall effect of WBV training (from the 15 studies included) compared to having no additional exercise on countermovement jump height yielded a positive standardized mean difference of 0.77 (95% confidence interval 0.55-0.99). The effect of WBV training on squat jump height was 0.68 (0.08-1.11). Vibration exercise consisting of a higher frequency (>30 Hz, 0.86, 0.62-1.10), higher amplitude (> 3 mm, 0.84, 0.52-1.17), longer exposure duration (> 10 min/session, 0.92, 0.48-1.36), longer training period (>12 weeks, 0.87, 0.56-1.19) and among non-athletes (0.96, 0.63-1.30) had greater benefit for jump height improvement than a lower frequency (≤ 30 Hz, 0.56, 0.13-0.99), lower amplitude (≤ 3 mm, 0.66, 0.35-0.98), shorter exposure duration (≤ 10 min/session, 0.68, 0.45-0.92), intermediate training period (4-12 weeks, 0.72, 0.35-1.09), shorter training period (< 4 weeks, 0.58,-0.08-1.23) and in athletes (0.59, 0.31-0.88). The effect of WBV training compared to a standard cardiovascular-type exercise group from 4 studies was 0.63 (0.10-1.15). In conclusion, WBV training produces a moderate to large effect on jump height. Vibration training protocols with higher frequencies, higher amplitudes, longer exposures per session and longer training periods are more likely to enhance muscle power.