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Spectral properties of myoelectric signals from different motor units in the leg extensor muscles

J. M. Wakeling
2004 Journal of Experimental Biology  
compared using principle component analyses and ANCOVA. Electrical stimulation can result in preferentially faster motor units being recruited, and in this study resulted in higher myoelectric frequencies than for the stretch reflex. During ramped contractions the motor units are recruited in an orderly fashion from slow to fast. As the faster motor units were recruited then higher frequency components appeared within the myoelectric intensity spectra. For all muscles tested there were
more » ... there were significant correlations between the stage in contraction and the EMG frequency. Both approaches demonstrated higher frequency components in the myoelectric spectra when the faster motor units could be assumed to be active.
doi:10.1242/jeb.01042 pmid:15184523 fatcat:6cvj3hllurepxgr2ds5waepevq