Modulation of EMG Power Spectrum Frequency During Motor Imagery

Lebon, F, Rouffet, David, Collet, C and Guillot, A (2008) Modulation of EMG Power Spectrum Frequency During Motor Imagery. Neuroscience Letters, 435 (3). pp. 181-185. ISSN 0304-3940


To provide evidence that motor imagery (MI) is accompanied by improvement of intramuscular conduction velocity (CV), we investigated surface electromyographic (EMG) activity of 3 muscles during the elbow flexion/extension. Thirty right-handed participants were asked to lift or to imagine lifting a weighted dumbbell under 3 types of muscular contractions, i.e. concentric, isometric and eccentric, taken as independent variables. The EMG activity of the agonist (long and short heads of biceps brachii) and the antagonist (long portion of triceps brachii) muscles was recorded and processed to determine the median frequency (MF) of EMG power spectrum as dependant variable. The MF was significantly higher during the MI sessions than during the resting condition while the participants remained strictly motionless. Moreover, the MF during imagined concentric contraction was significantly higher than during the eccentric. Thus, the MF variation was correlated to the type of contraction the muscle produced. During MI, the EMG patterns corresponding to each type of muscle contraction remained comparable to those observed during actual movement. In conclusion, specific motor programming is hypothesized to be performed as a function of muscle contraction type during MI.

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Item type Article
DOI 10.1016/j.neulet.2008.02.033
Official URL
Subjects Historical > Faculty/School/Research Centre/Department > School of Sport and Exercise Science
Historical > FOR Classification > 1106 Human Movement and Sports Science
Keywords ResPubID18562, motor imagery, EMG, mean frequency, muscle contraction types
Citations in Scopus 48 - View on Scopus
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