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Whole body vibration on performance of quadriceps after ACL reconstruction: a blinded randomized controlled trial
da Costa KSA, Borges DT, de Brito Macedo L, de Almeida Lins CA, Brasileiro JS
Journal of Sport Rehabilitation 2019 Jan;28(1):52-58
clinical trial
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

CONTEXT: Whole body vibration (WBV) has been widely used in clinical and sport practice. These devices produce constant vibrations originating symmetrical waves that move along the vertical axis. It is suggested that mechanical stimuli produced by high vibration can be an alternative to improve neuromuscular performance and balance in different populations. However, there is still a lack of consensus in the literature regarding neurophysiological responses in the skeletal muscle immediately after the use of WBV, specifically in individuals subjected to ACL reconstruction. OBJECTIVE: To investigate the immediate effects of whole-body vibration (WBV) on neuromuscular performance of the quadriceps femoris and postural oscillation of individuals subjected to anterior cruciate ligament (ACL) reconstruction. DESIGN: This is a blind randomized controlled trial. SETTING: University laboratory. PARTICIPANTS: Forty-four men. INTERVENTION: Participants were randomized into two groups: control group (n = 22, exercise protocol on the vibrating platform turned off) and WBV group (n = 22, exercises on the vibrating platform turned on, at a frequency of 50 Hz and amplitude of 4 mm). MAIN OUTCOME MEASURES: The volunteers underwent a dynamometric evaluation of the quadriceps femoris and electromyographic activity of vastus lateralis (VL) and vastus medialis (VM) muscles, in addition oscillation of the center of pressure at two different moments: before and immediately after the intervention protocol. RESULTS: The intra-group comparison evidenced differences between pre- and post-assessments for the variables of latero-lateral amplitude, peak torque and total work. However, no significant difference was observed in the intergroup comparison after WBV protocol. CONCLUSION: The use of a WBV does not immediately alter the performance of the quadriceps femoris, electromyographic activity of VL and VM muscles, nor interfere with pressure center oscillation of individuals subjected to ACL reconstruction.
Copyright Human Kinetics. Reprinted with permission from Human Kinetics (Champaign, IL).

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