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Whole body and local muscle vibration immediately improves quadriceps function in individuals with anterior cruciate ligament reconstruction
Pamukoff DN, Pietrosimone B, Lewek MD, Ryan ED, Weinhold PS, Lee DR, Blackburn JT
Archives of Physical Medicine and Rehabilitation 2016 Jul;97(7):1121-1129
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; 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*

OBJECTIVE: To determine the immediate effects of a single session of whole body vibration (WBV) and local muscle vibration (LMV) on quadriceps function in individuals with anterior cruciate ligament reconstruction (ACLR). STUDY DESIGN: Singe-blind randomized crossover trial. SETTING: Research Laboratory. PARTICPANTS: 20 population-based sample of individuals with ACLR (age 21.1 (1.2) years, mass 77.2 (17.1) kg, time since ACLR 50.7 (21.3) months; 14 females, 16 patellar tendon autograft, 3 hamstring autograft, 1 allograft). MAIN OUTCOME MEASURE: Participants performed isometric squats while being exposed to WBV, LMV, or no vibration (control). Interventions were delivered in a randomized order during separate visits separated by 1-week. Quadriceps active motor threshold (AMT), motor evoked potential (MEP) amplitude, H-reflex amplitude, peak torque (PT), rate of torque development (RTD), Electromygraphy (EMG) amplitude, and central activation (CAR) ratio was assessed prior to and immediately following a WBV, LMV, or control intervention. RESULTS: There was an increase in CAR (+4.9%, p = 0.001), and EMG amplitude (+16.2%, p = 0.002), and a reduction in AMT (-3.1%, p < 0.001) following WBV, and an increase in CAR (+2.7%, p = 0.001) and reduction in AMT (-2.9%, p < 0.001) following LMV. No effect was observed following WBV or LMV in H-reflex, RTD, or MEP amplitude. AMT (-3.7%, p < 0.001), CAR (+5.7%, p = 0.005), PT (+0.31 Nm/kg, p = 0.004) and EMG amplitude (p = 0.002) in the WBV condition differed from the control condition post application. AMT (-3.0% p = 0.002), CAR (+3.6% p = 0.005), and PT (+0.30 Nm/kg, p = 0.002) in the LMV condition differed from the control condition post application. No differences were observed between WBV and LMV post application in any measurement. CONCLUSION: WBV and LMV acutely improved quadriceps function, and could be useful modalities for restoring quadriceps strength in individuals with knee pathologies.

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