PMID: 7334409Dec 1, 1981Paper

Axonal refractory period of single short toe extensor motor units in neuropathies and neuromuscular diseases

Journal of Neurology, Neurosurgery, and Psychiatry
J Borg

Abstract

Electromyographic recordings were carried out on 36 patients with neuropathies and neuromuscular disorders with a selectivity permitting identification of single motor unit potentials during maximal voluntary effort and after supramaximal nerve stimulation. The axonal conduction velocity and refractory period of 117 motor units were determined and the findings were compared to those in previously studied normal subjects. The axonal conduction velocity spectrum was 15-52 m/s. Fifteen per cent of all motor units had axonal conduction velocities below 30 m/s which is below the normal range. When test stimulus strength was 10% above the axonal threshold at rest the refractory period was 1.88 +/- 0.43 ms which is slightly longer than the corresponding value in healthy subjects (1.67 +/- 0.25 ms). The relationship between the axonal conduction velocity and refractory period observed in healthy subjects did not hold for these patients. Thirty-eight per cent of all motor motor units with axonal conduction velocities within the normal range had refractory periods longer than 2.0 ms which was only infrequently observed in healthy subjects. When test stimulus strength was 50% above the axonal threshold at rest the refractory period was 1....Continue Reading

References

Jan 1, 1978·Journal of Neurology, Neurosurgery, and Psychiatry·J KopecA J McComas
Sep 1, 1978·Journal of Neurology, Neurosurgery, and Psychiatry·J KimuraR L Rodnitzky
Jul 1, 1976·Journal of Neurology, Neurosurgery, and Psychiatry·R P BettsB H Brown
Nov 1, 1972·Journal of the Neurological Sciences·K Lowitzsch, H C Hopf
Jan 1, 1974·European Neurology·W Tackmann, H J Lehmann
Feb 1, 1981·Journal of Neurology, Neurosurgery, and Psychiatry·K LowitzschH Köhler
Oct 1, 1980·Journal of Neurology, Neurosurgery, and Psychiatry·J Borg
Apr 1, 1963·Journal of Neurology, Neurosurgery, and Psychiatry·R W GILLIATT, R G WILLISON

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Citations

Jan 1, 1983·Journal of Neurology, Neurosurgery, and Psychiatry·B RossiF Bianchi
Apr 1, 1983·Journal of Neurology, Neurosurgery, and Psychiatry·J Borg
Apr 1, 1984·Journal of Neurology, Neurosurgery, and Psychiatry·J Borg
May 14, 2005·Neurophysiologie clinique = Clinical neurophysiology·D BoërioJ-P Lefaucheur
May 1, 1987·Muscle & Nerve·M K Alderson, J H Petajan

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