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Updated: May 12, 2026

Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
The variation of the strength of neck extensor muscles and semispinalis capitis muscle size with head and neck
A Rezasoltani1, R Nasiri, A M Faizei
1Department of Physiotherapy, Faculty of Rehabilitation Sciences & Physiotherapy Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. a_rezasoltani@sbmu.ac.ir
Abstract:
Semispinalis capitis muscle (SECM) is a massive and long cervico-thoracic muscle which functions as a main head and neck extensor muscle. The aim of this study was to detect the effect of head and neck positions on the strength of neck extensor muscles and size of SECM in healthy subjects. Thirty healthy women students voluntarily participated in this study. An ultrasonography apparatus (Hitachi EUB 525) and a system of tension-meter were used to scan the right SECM at the level of third cervical spine and to measure the strength of neck extensor muscles at three head and neck positions. Neck extensor muscles were stronger in neutral than flexion or than extension positions while the size of SECM was larger in extension than neutral or than flexion position. The force generation capacity of the main neck extensor muscle was lower at two head and neck flexion and extension positions than neutral position.
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