Effect of pain on the modulation in discharge rate of sternocleidomastoid motor units with force direction

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Deborah FallaDario Farina

Abstract

To compare the behavior of sternocleidomastoid motor units of patients with chronic neck pain and healthy controls. Nine women (age, 40.4+/-3.5 yr) with chronic neck pain and nine age- and gender-matched healthy controls participated. Surface and intramuscular EMG were recorded from the sternocleidomastoid muscle bilaterally as subjects performed isometric contractions of 10-s duration in the horizontal plane at a force of 15 N in eight directions (0-360 degrees ; 45 degrees intervals) and isometric contractions at 15 and 30 N force with continuous change in force direction in the range 0-360 degrees . Motor unit behavior was monitored during the 10-s contractions and the subsequent resting periods. The mean motor unit discharge rate depended on the direction of force in the control subjects (P<0.05) but not in the patients. Moreover, in three of the nine patients, but in none of the controls, single motor unit activity continued for 8.1+/-6.1s upon completion of the contraction. The surface EMG amplitude during the circular contraction at 15N was greater for the patients (43.5+/-54.2 microV) compared to controls (16.9+/-14.9 microV; P<0.05). The modulation in discharge rate of individual motor units with force direction is red...Continue Reading

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Citations

May 12, 2011·Current Pain and Headache Reports·Hong-You Ge, Lars Arendt-Nielsen
Nov 10, 2013·Archives of Oral Biology·N N GiannakopoulosD Hellmann
Jul 16, 2013·Manual Therapy·Jochen Schomacher, Deborah Falla
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