Single motor unit H-reflex in motor neuron disorders.

Abstract:

:The latency fluctuation of single motor unit potentials (MUPH) in the H-reflex is greater than the latency fluctuation of MUPs in the direct (MUPM) and recurrent (MUPF) responses. This has been attributed to the variability in the impulse generation at the site of nerve stimulation, and to the variation in the synaptic delay at the anterior horn cell. We studied the latency fluctuation of single motor unit H-reflex in patients with motor neuron disorders (MND) in comparison with normal subjects. The mean jitter of the H-reflex was 264.3 +/- 17.8 microseconds (mean +/- SEM) in 30 MUPH recorded from 10 patients with ALS, 302.7 +/- 25.2 microseconds in 16 MUPH from 6 patients with chronic motor neuron diseases, as compared with 137.4 +/- 7.3 microseconds in 34 MUPH recorded from 10 normal subjects. This difference, which persisted even after the correction for the latency variation of MUPM, cannot be explained on the basis of an enhanced reciprocal inhibition. Thus, the increased latency fluctuation of the single motor unit H-reflex in patients with MND may reflect changes in the motoneuron pool excitability that may be secondary to altered intrinsic electrophysiological properties of motoneurons, or to an abnormal temporal and spatial summation of synaptic inputs on motoneurons.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Soliven B,Maselli RA

doi

10.1002/mus.880150604

subject

Has Abstract

pub_date

1992-06-01 00:00:00

pages

656-60

issue

6

eissn

0148-639X

issn

1097-4598

journal_volume

15

pub_type

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