Influence of aging and the motor unit type on the inverse relationship between the refractory period and the conduction velocity of the alpha motor nerve fibers

1995 ◽  
Vol 18 (9) ◽  
pp. 1019-1020 ◽  
Author(s):  
Keisuke Arasaki ◽  
Hiroyuki Iwamoto ◽  
Mitsuyuki Tamaki
Keyword(s):  
Motor Unit ◽  
Conduction Velocity ◽  
Refractory Period ◽  
Inverse Relationship ◽  
Motor Nerve ◽  
Nerve Fibers ◽  
Unit Type

Nerve conduction velocity and refractory period in peripheral vascular disease

1962 ◽  
Vol 17 (5) ◽  
pp. 837-840 ◽  
Author(s):  
Osvaldo Miglietta ◽  
Milton Lowenthal
Keyword(s):  
Vascular Disease ◽  
Conduction Velocity ◽  
Patient Group ◽  
Refractory Period ◽  
Motor Nerve ◽  
Common Peroneal Nerve ◽  
The Elderly ◽  
Extensor Digitorum ◽  
Elderly Subjects ◽  
Extensor Digitorum Brevis

The conduction velocity and the residual latency of the common peroneal nerve and the refractory period of the extensor digitorum brevis were measured in a group of patients with occlusive vascular disease of the lower extremity, and compared with those of a group of normal and elderly subjects. The results indicate that motor nerve and muscle are affected in peripheral arteriosclerosis. The conduction velocity showed a decrease of 16.9% for the patient group and of 6.7% for the elderly normal subjects when compared to the young group. The refractory period of the extensor digitorum brevis, after 10 min of provoked ischemia and 2/sec stimulation, increased 105.1% in the patient group, 17.8% in the young, and 28.9% in the elderly group. Correlations between the electrical responses and the state of muscle and nerve as influenced by chronic arteriopathy are discussed. Submitted on October 26, 1961

scholarly journals The Effect of Local Cooling at the Elbow on Nerve Conduction Velocity and Motor Unit Behaviour: An Exploration of a Novel Neurological Assessment

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6703
Author(s):  
Jim Richards ◽  
Antonin Gechev ◽  
Jill Alexander ◽  
Liane Macedo ◽  
Karen A. May ◽  
...  
Keyword(s):  
Motor Unit ◽  
Conduction Velocity ◽  
Nerve Conduction ◽  
Nerve Conduction Velocity ◽  
Motor Nerve ◽  
Temperature Drop ◽  
Motor Nerve Conduction Velocity ◽  
Local Cooling ◽  
Firing Rates ◽  
Non Invasive

Background: This study aimed to determine the effects of a standard therapeutic cooling protocol using crushed ice on the elbow to explore if changes in the motor unit (MU) firing rates in the first dorsal interosseous (FDI) muscle are comparable to known changes in sensory and motor nerve conduction velocity (NCV) due to a regional temperature drop around a peripheral nerve. Methods: Twelve healthy individuals were assessed before cooling, immediately after cooling, and 15 min of rewarming. Assessments included two standard non-invasive nerve conduction velocity tests and a non-invasive investigation of the MU firing rates using surface electromyography decomposition (dEMG). Results: Repeated ANOVAs showed significant differences in the MU firing rates and NCV between time points (p = 0.01 and p < 0.001). All measures showed significant differences between pre and post cooling and between pre-cooling and 15 min of passive re-warming, however, no changes were seen between post cooling and rewarming except in the sensory NCV, which increased but did not return to the pre-cooled state. Conclusions: This current study showed a significant, temporary, and reversible reduction in ulnar NCV across the elbow in healthy subjects, which was associated with a significant decrease in mean MU firing rates in the FDI muscle.

scholarly journals Muscle biopsy findings, conduction velocity and refractory period of single motor nerve fibres in schizophrenia.

1987 ◽  
Vol 50 (12) ◽  
pp. 1655-1664 ◽  
Author(s):  
J Borg ◽  
L Edstrom ◽  
L Bjerkenstedt ◽  
F A Wiesel ◽  
L Farde ◽  
...  
Keyword(s):  
Conduction Velocity ◽  
Muscle Biopsy ◽  
Refractory Period ◽  
Motor Nerve ◽  
Nerve Fibres ◽  
Single Motor

Heat Exposure-Induced Changes in Motor Outflow Component of Reaction Time

1983 ◽  
Vol 56 (3) ◽  
pp. 699-706 ◽  
Author(s):  
J. W. Aird ◽  
R. D. G. Webb ◽  
J. Hoare
Keyword(s):  
Reaction Time ◽  
Skin Temperature ◽  
Conduction Velocity ◽  
Refractory Period ◽  
Motor Nerve ◽  
Heat Exposure ◽  
Dominant Male ◽  
Mean Skin Temperature ◽  
Absolute Refractory Period ◽  
Forearm Skin

Conduction velocity, absolute refractory period, and subnormal conduction period measures of the right ulnar motor nerve were obtained during a simple reaction time task. 6 young, healthy, right-arm dominant male subjects were tested following 30 min. exposure in ambient (20°C) and hot (36°C) room air conditions. Motor and premotor components of fractionated reaction time were tested on the same arm. Oral, right forearm skin and a four-site mean skin temperature were monitored. During heat exposure, forearm skin temperature increased 4.7°C and mean skin temperature 2.9°C. Oral temperature did not alter. Conduction velocity increased 11.4%, absolute refractory period decreased 22.7%, and subnormal conduction period decreased 14.1% in the hot condition. Concomitantly, a 5.2% increase in premotor reaction time and 12.2% decrease in motor reaction time were observed. Total RT did not alter significantly. It was concluded that different component parts of reaction time were differentially influenced by exposure to heat.

New Developments in Microneurography of Human C Fibers

Physiology ◽  
1996 ◽  
Vol 11 (4) ◽  
pp. 170-175
Author(s):  
C Forster ◽  
M Schmelz
Keyword(s):  
Conduction Velocity ◽  
Refractory Period ◽  
Nerve Fibers ◽  
Cutaneous Nerve ◽  
New Developments ◽  
Relative Refractory Period ◽  
C Fibers ◽  
Highly Sensitive ◽  
Different Types

Slowing of conduction velocity during the relative refractory period of an axon can be used to detect activation in human cutaneous nerve fibers. The method is highly sensitive and provides the means to identify individual unmyelinated afferent and efferent (sympathetic) units excited by different types of stimuli.

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