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Transducer-based evaluation of tremor.

Dietrich Haubenberger1, Giovanni Abbruzzese2, Peter G Bain3

  • 1Clinical Trials Unit, Office of the Clinical Director, National Institutes of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA. dietrich.haubenberger@nih.gov.

Movement Disorders : Official Journal of the Movement Disorder Society
|June 9, 2016
PubMed
Summary

Transducer-based measures like accelerometry and gyroscopy effectively quantify tremor. While sensitive to amplitude and frequency changes, their ability to detect significant tremor changes requires careful consideration of limitations.

Keywords:
accelerometryelectromyographyreproducibility of resultstransducerstremor

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Movement Disorders

Background:

  • Tremor quantification traditionally relies on subjective rating scales.
  • Objective, quantitative measures are needed for accurate tremor assessment.
  • The International Parkinson and Movement Disorder Society initiated a task force to evaluate transducer-based methods.

Purpose of the Study:

  • To review and assess the utility of transducer-based measures for tremor quantification and characterization.
  • To identify measures meeting specific criteria for reliability and validity in tremor studies.

Main Methods:

  • A comprehensive literature search of PubMed.gov was conducted for transducer-based tremor measures.
  • Measures were evaluated based on their use in tremor assessment, independent studies, and clinimetric testing.
  • Specific methods reviewed included accelerometry, electromyography, gyroscopy, and digitizing tablet-based approaches.

Main Results:

  • Accelerometry, gyroscopy, electromyography, and digitizing tablet measures met all inclusion criteria.
  • Transducer-based measures demonstrate higher sensitivity to tremor amplitude and frequency variations than rating scales.
  • The minimum detectable change for tremor amplitude using these measures may not consistently exceed random variability.

Conclusions:

  • Accelerometry, gyroscopy, electromyography, and digitizing tablet measures are validated tools for tremor assessment.
  • Clinicians and researchers must carefully consider the limitations and specific validity of these measures.
  • Further research may be needed to optimize the detection of clinically significant tremor changes with transducer-based methods.