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Motor unit recruitment behavior is not readily identifiable from EMG spectral changes.

A dilemma exists in the fact that in experiments where an orderly recruitment of motor units is expected, such as during ramp contractions or submaximal fatiguing contractions, the spectral properties of the surface EMG signal appear to rarely reflect the underlying changes in motor neuron recruitment and rate coding, but are more influenced by some of the confounding factors pointed out by Farin. I do not believe it is acceptable to discount many of these concerns on the basis of task specificity and therefore side with the persuasive arguments made by Farina.