In the giant axon, action potential duration and conduction velocity
are strongly affected by temperature (Hodgkin and Katz, 1949; Chapman, 1967).
30] In normally myelinated fibers, the opposite is true; small increases in temperature actually increase conduction velocity
in a brain nerve pathway of normal adults correlates with intelligence level.
14] This mode of tapering may help explain the decrements in conduction velocity
from proximal to distal nerve segments and from the upper to lower extremities, which have long been observed in clinical EMG.
The highest sensitivities were found in the median sensory nerve conduction velocity
across the palm-wrist, and digit I-wrist segments, median motor distal latency over the APB muscle, and L-I study.
The Motor Nerve Conduction Velocity
(MNCV) and Sensory Nerve Conduction Velocity
(SNCV) in different nerves studied were compared with normal laboratory value.
Motor nerve conduction velocity
studies of ulnar nerve in patients with leprosy.
The most important finding of this study was that both EMG amplitude (presented as RMS) and frequency (presented as MNF) decreased in parallel with power output during the 3MT, indicating that there was a decline in motor unit recruitment and muscle fiber conduction velocity
(Stewart et al.
3 10 (2nd F-W) (mV) conduction velocity
(m/s) 50 54.
The values (mean [+ or -] standard deviation) of conduction velocity
for the CTS group for median and ulnar nerves respectively were 48.
However, significant changes in resting membrane potential, upstroke velocity or amplitude of the action potential, as well as conduction velocity
in hypertrophied myocardium were reported (26-28).
The investigators also discovered that in the exercise group, measures of vibration perception threshold, nerve distal latency, nerve conduction velocity
, and nerve action potential amplitude in the lower limbs were more favorable after 4 years than in the control group.