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- Title
Correlates of mototr unit size, recritment threshold, and h-refles jitter.
- Authors
Jabre, Joe F.; Rainville, James; Salzsieder, Byron; Smuts, Johnnes; Limke, Janet
- Abstract
The aim of this research was to study the neurophysiology of the anterior horn cell (AHC) using single-fiber EMG (SFEMG) study of the flexor carpi radialis (FCR) H-reflex. Twelve men and 7 women, ages 20-80 years, were studied. The mean H-jitter was 138 ± 59 μs. H-jitter increased with age (while the M-jitter did not) and was greater in men than in women. There was a direct correlation between the H-jitter and H-latency which was used as an indirect measure of the AHC's size. Given that small AHCs have a higher input resistance than large ones, the H-jitter can be used as an indirect indicator of the AHC's input resistance and therefore its size. When subjects fell asleep, the H-jitter increased over tenfold the baseline value, reising the possibility of an alternative, oligosynaptic pathway. H-reflex jitter studies provide a useful clinical neurophysiological tool for the study of AHC physiology. © John Wiley & Sons, Inc.
- Publication
Muscle & Nerve, 1995, Vol 18, Issue 11, p1300
- ISSN
0148-639X
- Publication type
Article
- DOI
10.1002/mus.880181113