The purpose of this study was to investigate the effects
of a single bout of whole-body vibration on isometric squat (IS)
and countermovement jump (CMJ) performance. Nine moderately
resistance-trained men were tested for peak force (PF) during
the IS and jump height (JH) and peak power (PP) during
the CMJ. Average integrated electromyography (IEMG) was
measured from the vastus medialis, vastus lateralis, and biceps
femoris muscles. Subjects performed the 2 treatment conditions,
vibration or sham, in a randomized order. Subjects were tested
for baseline performance variables in both the IS and CMJ, and
were exposed to either a 30-second hout of whole-body vibration
or sham intervention. Subjects were tested immediately following
the vibration or sham treatment, as well as 5, 15, and 30
minutes posttreatment. Whole-body vibration resulted in a significantly
higher (p < 0.05) JH during the CMJ immediately
following vibration, as compared with the sham condition. No
significant differences were observed in CMJ PP; PF during IS
or IEMG of the vastus medialis, vastus lateralis, or biceps femoris
during the CMJ; or IS between vibration and sham treaments.
Whole-body vibration may be a potential warm-up procedure
for increasing vertical JH. Future research is warranted
addressing the influence of various protocols of whole-body vibration
(i.e., duration, amplitude, frequency) on athletic performance