Differences between the time constant of sensory and motor peripheral nerve fibers: further studies and considerations

Muscle & Nerve
M PanizzaM Hallett

Abstract

Using a method of latent addition, we previously demonstrated that sensory fibers had time constants that were about three times longer than those of motor fibers. The aim of the present work was to confirm this difference by determining the time constants for single sensory axons by using microneurography and for single motor axons by recording single motor units with bipolar concentric needle electrodes. To determine the influence of the conditioning pulse on the neural time constant, we used both depolarizing and hyperpolarizing conditioning pulses. When hyperpolarizing conditioning pulses at comparable intensity were applied, the tendency was to find shorter time constants than when depolarizing pulses were applied, although still with the motor time constant being slightly shorter. Although the absolute values varied with the different methods, the sensory time constant was generally three times the motor time constant for depolarizing conditioning stimuli, whereas for hyperpolarizing conditioning stimuli the difference dropped to about one and a half. These characteristics improve understanding of the behavior of sensory and motor axons, and, in particular, explain the differential excitability. Determination of neural ti...Continue Reading

References

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Citations

Sep 17, 2014·Canadian Journal of Physiology and Pharmacology·Alyssa R HindleDavid F Collins
Nov 29, 2002·The Journal of Physiology·Cindy S-Y LinDavid Burke
Feb 1, 2008·Muscle & Nerve·Olle Lagerquist, David F Collins
Dec 5, 2006·Muscle & Nerve·Elizabeth C ClarkeLynne E Bilston
Oct 13, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bryan J RecoskieBlaine A Chronik
Nov 5, 2013·Neuromodulation : Journal of the International Neuromodulation Society·Jeffrey E ArleJay L Shils
Apr 14, 2005·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·D I StephanovaA S Alexandrov
Jan 18, 2008·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Djordje PopovicGerald E Loeb
May 11, 2004·IEEE Transactions on Bio-medical Engineering·Aleksandra VuckovićJohannes J Struijk
Apr 25, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Hiroyuki Nodera, Ryuji Kaji
Jan 8, 2011·Gait & Posture·Yung-Sheng Chen, Shi Zhou
Oct 28, 2016·Brain Research Bulletin·Ai-Ling LiYuan Bo Peng
Apr 14, 2005·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·D I Stephanova, M Daskalova
Sep 14, 2000·Medical & Biological Engineering & Computing·A G RichardsonW M Grill
May 13, 2018·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Sabata GervasioErika G Spaich
Jul 6, 2006·European Journal of Applied Physiology·Ashraf S GorgeyGary A Dudley
Jul 9, 1999·Medical & Biological Engineering & Computing·W A WesselinkH B Boom
Feb 5, 2002·Journal of Neurophysiology·Cameron C McIntyreWarren M Grill

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