ACTION POTENTIAL PARAMETERS IN DIFFERENT HUMAN MUSCLES

Clianges i i i duration, :iinl)litude, and shape of muscle action poteutials are used as signs of the degree and the localisation of involvement in neuroinuscular diseases. Normative values of these parameters are necessary. Previous papers dealing with the influence of soine physical and physiological factors on the action potential parameters concerned the brachial biceps only (Buchthal et al. 1954, b and c) . There are, however, differences in different muscles (PefersCn and Iiugelberg 1949 ; Jasper and Hallein 1949 ; Buchtlial and Pinelli 1951 : Feinstein et nl. 1954, a and h ) , and i t is the aim of the present study to provide data on different muscles for comparison with findings i n clinical electromyography.

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