17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 412
Session: [EP-UD01] E-poster undebated
Lecture room: On screens
Date & time: 02.07.2014 / -
Title of the paper: Effect of Progressive-overload Whole Body Vibration Training as Part of Off-season Strength Training in Female Athletes
Authors: Jones, M.T.
Institution: George Mason University
Department: Kinesiology
Country: United States
Abstract text Introduction Use of whole body vibration (WBV) as an intervention method for athletic development in trained women has been inconclusive. Bodyweight WBV (Jones et al., 2011) and externally loaded WBV (Preatoni et al., 2012) training in conjunction with conventional strength training (ST) showed the inclusion of WBV had no apparent benefit over ST, yet there was little change in the protocol. Therefore, the aim of this study was to analyse the effect of a periodized, progressive-overload WBV+ST protocol on strength and power. Methods Lacrosse athletes (n=18, 19.6 + 1.2 yr, 167.37 + 8.34 cm, 66.10 + 7.13 kg) with > 1 year of ST, but no prior WBV training, completed the 15-week (wk) study. Random assignment to Group 1 (GP1) or 2 (GP2) followed pre-tests (wk1) of seated medicine ball throw (SMBT), single leg hop for each leg (LSLH, RSLH), countermovement vertical jump (CMVJ), 3-RM front squat (FS), pull-up (PU), bench press (BP), and %body fat (BF). WBV was two 3-wk phases of dynamic and static-hold bodyweight exercises administered 2 days/wk in team ST sessions. The 15-wk training included Phase I (wk2-4): WBV1+ST1 (GP1) or WBV1sham+ST1 (GP2), Phase II (wk5-7): WBV1+ST1 (GP2) or WBV1sham+ST1 (GP1), post-test 1 (wk 8), Phase III (wk9-11): WBV2+ST2 (GP1) or WBV2sham+ST2 (GP2), Phase IV (wk12-14): WBV2+ST2 (GP2) or WBV2sham+ST2 (GP1), and post-test 2 (wk15). WBVsham+ST and WBV+ST were identical exercise protocols minus the WBV. Total WBV exposure was 6 min broken into 30-sec bouts with 60-sec rest for a 1:2 work relief ratio. Exercises, frequency and amplitude progressed in intensity from the first 3-wk (Phase I,II) to the second 3-wk (Phase III,IV) training phase. Five 2 x 3 repeated measures analyses of variance (ANOVA) were used to analyze SMBT, CMVJ, LSLH, RSLH and FS, and three 2 x 2 repeated measures ANOVAs were used for %BF, PU and BP. Alpha level was set at p<0.05. Results FS (38%), LSLH (12%), and RSLH (15%) increased (p=0.001) from pretest to post-test 2. FS (9%) increased from post-test 1 to post-test 2. %BF (4%) decreased (p=0.04) and PU (27%) increased (p=0.008) from pretest to post-test 2. SMBT (3%) and BP (4%) showed a trend of increased performance from pretest to post-test 2 (p=0.10). Discussion Two 3-week phases of periodized, progressive-overload WBV+ST training elicited gains in upper- and lower- body strength (FS, PU), power (LSLH, RSLH), and %BF during a 15-wk off-season program in trained female athletes. No differences existed between GP1 and GP2, indicating the timing of WBV [Phase I, Phase III (GP1) or Phase II, Phase IV (GP2)] had no effect. Greatest improvements in performance tests occurred in the initial WBV phase. References Jones, MT, et al. (2011). J Strength Cond Res 25(9), 2434-2441. Preatoni, E, et al. (2012). J Strength Cond Res 26(9), 2495-2506.
Topic: Training and Testing
Keyword I: power
Keyword II: lacrosse
Keyword III: performance tests