Functional significance of upper and lower motor neuron impairment in amyotrophic lateral sclerosis.

Abstract:

:The objective of this study was to examine the contribution of lower motor neuron (LMN) and upper motor neuron (UMN) dysfunction to weakness and impaired motor control in 27 patients with amyotrophic lateral sclerosis (ALS). Isometric strength was measured by dorsiflexor maximum voluntary contraction force (MVC). LMN function was measured by tetanic force, twitch force, and the amplitude of the compound muscle action potential. UMN function was measured by the speed of rapid foot taps, the maximum rate of rise of voluntary force, and the central activation ratio [CAR = MVC/(MVC + superimposed tetanic force)]. The results suggest that (1) LMN loss appears to be the primary cause of progressive weakness in ALS; while (2) UMN impairment in ALS leads to slowing of contraction speed and rapid movements, and modest decreases in central activation; and (3) during 6 months of progression, LMN changes were greater than UMN changes.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Kent-Braun JA,Walker CH,Weiner MW,Miller RG

doi

10.1002/(sici)1097-4598(199806)21:6<762::aid-mus8>

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

762-8

issue

6

eissn

0148-639X

issn

1097-4598

pii

10.1002/(SICI)1097-4598(199806)21:6<762::AID-MUS8>

journal_volume

21

pub_type

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