Location of end-plate region and measurement of conduction velocity of action potential in human muscles by unidimensional latency-topography.
The conduction profile of an action potential elicited by weak voluntary contraction of the m. biceps brachii was graphically displayed by unidimensional latency-topography, UDLT. The end-plate location and conduction velocity (CV) were determined by UDLT. The end-plate location of the m. biceps brachii was measured as 12-15 cm proximal to the epicondylus medialis and remained at the same region independently of the elbow angle. The CV of the action potential of various muscles was also measured in five subjects to reveal inter-muscular variation. The variation in the CV among various muscles in the same subject and that among subjects was not statistically significant. The CV measured ranged from 3.4 to 3.8 m/s.
Nakajima
Y
Y
Department of Physiology, School of Medicine, Chiba University, Japan.
Kusama
T
T
D000200:Action Potentials; D004553:Electric Conductivity; D004576:Electromyography / Q000379:methods*; D001330:Electronic Data Processing / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D009132:Muscles / Q000033:anatomy & histology / Q000502:physiology*