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Validation of a Novel device for Assessing Neck Muscle Strength.

Michail Arvanitidis1, Hon Hin Ken Mak1, Eduardo Martinez-Valdes1

  • 1Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham - UK.

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|June 13, 2025
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Summary

The Neuromuscular Cranio-Cervical Device (NOD) shows strong validity and reliability for measuring neck extension strength and good reliability for flexion. This portable tool offers a promising alternative for assessing neck muscle strength in clinical settings.

Keywords:
Concurrent ValidityHandheld DynamometerInter-rater ReliabilityIntra-rater ReliabilityMulti-Cervical UnitNeck Muscle Strength

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Area of Science:

  • Biomechanics
  • Neuromuscular Physiology
  • Rehabilitation Technology

Background:

  • The Neuromuscular Cranio-Cervical Device (NOD) is a handheld dynamometer for assessing neck muscle strength.
  • It presents a potential alternative to the fixed Multi-Cervical Unit (MCU).
  • Establishing the validity and reliability of the NOD is crucial for its clinical adoption.

Purpose of the Study:

  • To evaluate the concurrent validity of the NOD against the MCU for neck flexion and extension strength.
  • To determine the inter- and intra-rater reliability of the NOD for these measurements.

Main Methods:

  • Twenty participants underwent seated neck flexion/extension strength testing with the NOD over three sessions.
  • Concurrent validity was assessed using Pearson correlation coefficients.
  • Reliability was determined using Intraclass Correlation Coefficients (ICCs).

Main Results:

  • Strong concurrent validity was found for extension (r = 0.954) and moderate for flexion (r = 0.705).
  • Inter-rater reliability was good to excellent for both flexion (ICC = 0.931) and extension (ICC = 0.896).
  • Intra-rater reliability was good to excellent for extension (ICC = 0.893) and moderate to excellent for flexion (ICC = 0.844).

Conclusions:

  • The NOD demonstrates validity, particularly for neck extension strength measurement.
  • The device is reliable for both flexion and extension assessments.
  • The NOD shows potential as a practical, portable tool for clinical neck muscle strength evaluation.