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J Electromyogr Kinesiol. 2015 Apr;25(2):316-22. doi: 10.1016/j.jelekin.2014.11.007. Epub 2014 Dec 11.

Immediate increases in quadriceps corticomotor excitability during an electromyography biofeedback intervention.

Author information

1
Department of Exercise and Sports Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States. Electronic address: brian@unc.edu.
2
Department of Health and Human Performance, College of Charleston, Charleston, SC, United States.
3
Department of Athletics, United States Naval Academy, Annapolis, MD, United States.
4
College of Health Sciences, University of Kentucky, Lexington, KY, United States.
5
Department of Rehabilitation Sciences, University of Toledo, Toledo, OH, United States.

Abstract

The purpose of the study was to determine the effects of EMG-BF on vastus lateralis corticomotor excitability, measured via motor evoked potential (MEP) amplitudes elicited using Transcranial Magnetic Stimulation (TMS) during a maximal voluntary isometric contraction (MVIC). We also determined the effect of EMG-BF on isometric knee extensor strength. Fifteen healthy participants volunteered for this crossover study with two sessions held one-week apart. Participants were randomly assigned to condition order, during which five intervention MVICs were performed with or without EMG-BF. MEP amplitudes were collected with TMS during five knee extension contractions (5% of MVIC) at baseline and again during intervention MVICs within each session. During the control condition, participants were instructed to perform the same number of MVICs without any EMG-BF. Percent change scores were used to calculate the change in peak-to-peak MEP amplitudes that occurred during EMG-BF and Control MVICs compared to the baseline MEPs. Peak knee extension torque was recorded during MVICs prior to TMS for each condition. EMG-BF produced significantly increased MEP change scores and significantly greater torque than the control condition. The results of the current study suggest that EMG-BF may be a viable clinical method for targeting corticomotor excitability.

KEYWORDS:

Arthrogenic muscle inhibition; Knee; Rehabilitation

PMID:
25561075
DOI:
10.1016/j.jelekin.2014.11.007
[Indexed for MEDLINE]

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