Anatomical and electrophysiological determinants of the human thenar compound muscle action potential

Single motor unit responses underlying cervical vestibular evoked myogenic potentials produced by bone-conducted stimuli

“…In contrast, the n23 potential latency remained relatively constant, suggesting that it was produced by the momentary dipole generated by the arrival of the inhibitory response at the muscle-tendon junction, i.e. by a terminal standing wave (Lateva et al, 1996). The latency of this standing wave represents the time it takes for the response to reach the tendon.…”

Nerve conduction topography in geriatric hand assessment

“…This variation explains why CMAP parameters are so sensitive to electrode position [26] and why larger electrodes, averaged over a wider area, reduce variability. Lateva et al and McGill et al used mathematical models and volume conductor theory to describe the way the electrical potential field throughout the limb evolves in space and time during the action potential [23,27]. Their results explain the differences in CMAP shapes associated with different recording montages and different joint configurations.…”

“…Blok et al used a 128-electrode array to record the spatial distribution of electrically evoked motor-unit action potentials in the thenar muscles [22]. Van Dijk et al [11] and Lateva et al [23] mapped the spatial distribution of CMAPs using a multielectrode with only eight or four recording surfaces, which had to be continuously repositioned. Van Dijk et al found that larger electrodes reduce the variability of CMAP parameters associated with slight displacements of electrode position [20,24].…”

Satellite potentials of motor unit action potentials in normal muscles: a new hypothesis for their origin

“…This paper presents a detailed analysis of the waveforms of several MUAPs with satellite potentials from normal muscles of healthy subjects. The analysis is based on the results from previous simulation and experimental studies (Dimitrova, 1974;Sta Êlberg et al, 1986Sta Êlberg et al, , 1996Dimitrova et al, 1991;Gootzen et al, 1991;Lateva et al, 1993Lateva et al, , 1996Lateva and McGill, 1998a,b) that relate speci®c morphological features of the MUAP to certain electrical events in the muscle. In particular, in MUAPs recorded by monopolar needle electrodes, the 4 main stages of electrical activity ± the initiation, propagation, termination, and slow repolarization ± are each marked by a speci®c morphological feature.…”

“…The latency of the spike thus depends on the location of the recording electrode with respect to the endplate and the muscle/tendon junction. The termination of electrical activity at the muscle/tendon junction is marked by a distinct MUAP de¯ection known as the terminal wave (Gydikov and Kosarov, 1972;Kosarov and Gydikov, 1975;Gootzen et al, 1991;Lateva et al, 1996;Roeleveld et al, 1997). Like the onset, the terminal wave occurs at the same time at all recording sites.…”