This paper is only available as a PDF. To read, Please Download here.
Abstract
Time-locked activity in the EMG was studied in normal, neuropathic and myopathic muscles,
using the averaging technique. Normal and neuropathic muscles seemed in most cases
not to differ with regard to the frequency nor the quality of “satellite signals”,
i.e. small and short potentials joining the main component of the MUP with a constant
interval, up to 26 ms in duration. In normal muscles 10% of the MUPs and in neuropathic
muscles 12% had a satellite, which, when studied, showed no signs of blocking. However,
in 2 patients with an apparent old spinal affection both an increased number and an
increased latency of satellite signals were found. In the different myopathies studied
45% of the MUPs recorded consecutively were preceded or followed by an often increased
number of tiny satellites. Sometimes the satellites joining the myopathic MUP formed
a long (up to 60 ms) “tail” after the triggering component. On the basis of our results
we conclude that in myopathies the total duration of MUPs is in certain cases pathologically
increased rather than decreased.
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe to Journal of the Neurological SciencesAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
References
- An Introduction to Electromyography.in: Gyldendal, København1957: 1-43
- Terminal innervation ratio in neuromuscular disease, Part 2 (Disorders of lower motor neuron, peripheral nerve, and muscle).Arch. Neurol. (Chic.). 1973; 29: 215-222
- Collateral innervation of muscle fibres by motor axons of dystrophic motor units.Nature (Lond.). 1973; 246: 500-501
- Electromyographic findings on two types of misdirection of regenerating axons.Electroenceph. clin. Neurophysiol. 1960; 12: 738-741
- Axon reflexes in human motor nerves.J. Neurol. Neurosurg. Psychiat. 1965; 28: 1-11
- Studies of the carrier state in the Duchenne type of muscular dystrophy, Part 2 (Quantitative electromyography as a method of carrier detection).J. Neurol. Neurosurg. Psychiat. 1968; 31: 124-134
- Ultrastructural studies of diseased muscle.in: Walton J.N. Disorders of Voluntary Muscle. 3rd edition. Churchill, Edinburgh, London1974: 360-416
- “Split” motor unit potentials of the human muscle.Sechenov. physiol. J. U.S.S.R. 1971; 57 (in russian): 38-44
- Averaging and automatic analysis of EMG signals — Applications of a new method.Scand. J. Rehab. Med. 1974; : 33-36
- The time parameters of motor unit potentials recorded with multielectrodes and the summation technique.Electromyography. 1975; 15: 87-99
- The baseline, the time characteristics and the slow afterwaves of the motor unit potential.Electroenceph. clin. Neurophysiol. 1973; 35: 387-394
- A delay line to record random action potentials.Electroenceph. clin. Neurophysiol. 1969; 26: 100-106
- Synchronous fasciculation in motor neuron disease.Arch. Neurol. (Chic.). 1965; 13: 495-500
- Décharge couplée réflexe d'axone moteur.Electromyography. 1971; 11: 459-465
- Effects of ischaemia of trained motor units.Amer. J. Phys. Med. 1968; 47: 64-71
- Propagation velocity in human muscle fibres in situ.Acta physiol. scand. 1966; 70: 112
- Single fibre EMG and microphysiology of the motor unit in normal and diseased human muscle.in: New Developments in EMG and Clinical Neurophysiology. Vol. 1. S. Karger, Basel1973: 89-112
- Demonstration of axon reflexes in human motor nerve fibres.J. Neurol. Neurosurg. Psychiat. 1970; 33: 571-579
- Single fibre EMG findings in muscular dystrophy.in: Hausmanova-Petrusewicz I. Jedrzejowska H. Structure and Function of Normal and Diseased Muscle and Peripheral Nerve. Polish Medical Publishers, Warsaw1974: 185-190
- The coupling discharge in neurogenic muscular atrophy.Arch. Neurol. (Chic.). 1966; 14: 617-623
Article info
Publication history
Received:
August 11,
1975
Footnotes
☆This investigation was supported by the National Research Council for Medical Sciences, Finland.
Identification
Copyright
© 1976 Published by Elsevier Inc.
