Introduction: The signals obtained during conventional needle examination are usually assessed subjectively by the neurophysiologist. Buchthal's approach allows quantification of several motor unit parameters during mild effort.
Development: The automatic methods of analysis of the EMG interference pattern (IP), in particular Turns/Amplitude, give us information concerning the number, firing rate, and morphology of the motor units, as well as the recruitment pattern at different degrees of effort. In pathological conditions, the changes in the IP allow distinction between myopathies and neuropathies.
Conclusion: These methods, which complement other methods of motor unit analysis, have also proved to be excellent for follow up studies.