Contractile properties of human nasal dilator motor units

Journal of Neurophysiology
J H MateikaR F Fregosi

Abstract

The technique of intramuscular microstimulation was used to activate facial nerve fibers while acquiring simultaneous twitch force measurements to measure the contractile properties and force-frequency responses of human nasal dilator (ND) motor units. Twitch force amplitude (TF), contraction time (CT), half-relaxation time (HRT), and the maximal rate of rise of force normalized to the peak force (maximum contraction rate, MCR) were recorded from 98 ND motor units in 37 subjects. The average CT, HRT, MCR, and TF were 47.9 +/- 1.8 ms, 42.6 +/- 2.1 ms, 28.6 +/- 1.8 s-1, and 1.06 +/- 0.1 mN, respectively. Neither CT nor HRT were significantly correlated with TF. The average CT and HRT were similar to values recorded for small muscles of the hand but were faster than the values recorded from human toe extensor motor units. However the lack of an association between twitch force and CT or HRT was similar to the findings obtained for both human hand and foot muscles. Force-frequency curves were recorded from eight ND motor units. The force produced by the eight motor units was recorded in response to stimuli delivered at 1, 5, 10, 15, 20, 25, 30, 35, and 40 Hz to assess force-frequency relationships. The mean twitch force of the eigh...Continue Reading

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Citations

May 10, 2005·Muscle & Nerve·Penelope A McNulty, Vaughan G Macefield
Oct 26, 1999·Gerodontology·A J McComas
Apr 14, 1999·Journal of Neurophysiology·A J FuglevandB Bigland-Ritchie
Dec 19, 2008·Journal of Neurophysiology·Kori SchmittRalph F Fregosi
Feb 21, 2009·Computer Methods in Biomechanics and Biomedical Engineering·Markus Böl, Stefanie Reese
Jul 15, 2015·Experimental Brain Research·Nilam Patel-Khurana, Ralph F Fregosi

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