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Alterations in Muscle Tone lll

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Updated: Jun 19, 2026

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia

Published on: January 27, 2018

Neck movement speed in cervical dystonia.

Diederik Zegers De Beyl¹, Patrick Salvia

¹Service de Neurologie, Hôpital Erasme, Université Libre de Bruxelles, Belgique.

Movement Disorders : Official Journal of the Movement Disorder Society

|October 22, 2009

Summary

Cervical dystonia (CD) patients exhibit significantly slower voluntary neck movements, a finding not captured by current clinical scales. This reduced movement velocity is a key indicator of the condition and correlates with symptom severity.

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Published on: November 21, 2013

Area of Science:

Neurology
Movement Disorders
Biomechanical Analysis

Background:

Current clinical scales for cervical dystonia (CD) do not assess neck movement velocity.
Understanding the biomechanics of neck movement in CD is crucial for accurate assessment.

Purpose of the Study:

To prospectively measure and compare neck movement range and velocity in patients with CD and healthy controls.
To identify unrecognized features of CD related to movement kinematics.

Main Methods:

Prospective measurement of range of motion and peak movement velocities for neck movements.
Comparison between 35 consecutive CD patients and 29 normal controls.
Correlation analysis between movement abnormalities and the Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS).

Main Results:

Reduced peak velocities in voluntary neck movements were the most significant abnormality in CD patients.
CD patients showed increased coupled movements outside the intended plane of motion.
Moderate but significant reductions in overall movement range were observed in the CD group.
Reduced peak velocity correlated significantly with TWSTRS scores.

Conclusions:

Slowing of voluntary neck movements is a frequent and previously unrecognized characteristic of cervical dystonia.
Movement velocity, alongside range, should be considered in the clinical assessment of CD.
These findings highlight the importance of dynamic kinematic analysis in understanding CD pathophysiology.