Clinical biomechanics
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Clinical biomechanics · May 1988
E.m.g./moment relationships in neck muscles during isometric cervical spine extension.
The aim of the study was to describe the e.m.gJmuscular moment (torque) relationships for neck and shoulder muscles during cervical spine extension. Ten healthy women participated. Their average age was 25·6 years. ⋯ Simultaneously with the force recording, the e.m.g. activity was recorded through surface electrodes applied unilaterally at six locations in the neck and shoulder region. The rectified low-pass filtered e.m.g. signals were normalized against the highest activity level obtained during a series of standardized isometric test contractions. The results show that a non-linear e.m.g./moment relationship exists in axial musculature of the cervical spine, with a slightly higher increase in e.m.g. levels at high muscular moment values.