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Arch Phys Med Rehabil. 2016 Jul;97(7):1121-9. doi: 10.1016/j.apmr.2016.01.021. Epub 2016 Feb 8.

Whole-Body and Local Muscle Vibration Immediately Improve Quadriceps Function in Individuals With Anterior Cruciate Ligament Reconstruction.

Author information

1
Department of Kinesiology, California State University, Fullerton, Fullerton, CA; Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC. Electronic address: dpamukoff@fullerton.edu.
2
Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC.
3
Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Division of Physical Therapy, The University of North Carolina at Chapel Hill, Chapel Hill, NC.
4
Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Orthopedics, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill and Raleigh, NC.
5
Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC.
6
Department of Exercise and Sport Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Curriculum in Human Movement Science, The University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Orthopedics, The University of North Carolina at Chapel Hill, Chapel Hill, NC.

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).

DESIGN:

Singe-blind, randomized crossover trial.

SETTING:

Research laboratory.

PARTICIPANTS:

Population-based sample of individuals with ACLR (N=20; mean age ± SD, 21.1±1.2y; mean mass ± SD, 68.3±14.9kg; mean time ± SD since ACLR, 50.7±21.3mo; 14 women; 16 patellar tendon autografts, 3 hamstring autografts, 1 allograft).

INTERVENTIONS:

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.

MAIN OUTCOME MEASURES:

Quadriceps active motor threshold (AMT), motor-evoked potential (MEP) amplitude, Hoffmann reflex (H-reflex) amplitude, peak torque (PT), rate of torque development (RTD), electromyographic amplitude, and central activation ratio (CAR) were assessed before and immediately after a WBV, LMV, or control intervention.

RESULTS:

There was an increase in CAR (+4.9%, P=.001) and electromyographic amplitude (+16.2%, P=.002), and a reduction in AMT (-3.1%, P<.001) after WBV, and an increase in CAR (+2.7%, P=.001) and a reduction in AMT (-2.9%, P<.001) after LMV. No effect was observed after WBV or LMV in H-reflex, RTD, or MEP amplitude. AMT (-3.7%, P<.001), CAR (+5.7%, P=.005), PT (+.31Nm/kg, P=.004), and electromyographic amplitude (P=.002) in the WBV condition differed from the control condition postapplication. AMT (-3.0% P=.002), CAR (+3.6%, P=.005), and PT (+.30Nm/kg, P=.002) in the LMV condition differed from the control condition postapplication. No differences were observed between WBV and LMV postapplication in any measurement.

CONCLUSIONS:

WBV and LMV acutely improved quadriceps function and could be useful modalities for restoring quadriceps strength in individuals with knee pathologies.

KEYWORDS:

Knee; Muscles; Osteoarthritis; Rehabilitation; Resistance training

PMID:
26869286
DOI:
10.1016/j.apmr.2016.01.021
[Indexed for MEDLINE]

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