Whole body and local muscle vibration immediately improves quadriceps function in individuals with anterior cruciate ligament reconstruction

 

Posted on February 13, 2016 by Stone Hearth News

 

 

Arch Phys Med Rehabil. 2016 Feb 8. pii: S0003-9993(16)00088-5. doi: 10.1016/j.apmr.2016.01.021. [Epub ahead of print]

Whole body and local muscle vibration immediately improves quadriceps function in individuals with anterior cruciate ligament reconstruction.

Pamukoff DN1, Pietrosimone B2, Lewek MD3, Ryan ED2, Weinhold PS4, Lee DR5, Blackburn JT6.
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Abstract

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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See other articles about Sports Medicine: Injuries, Sports Medicine: Injuries: ACL, Vibration Training

 

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