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Essential tremor quantification based on the combined use of a smartphone and a smartwatch: The NetMD study
[Display omitted] •Smartwatches can be adapted to register tremor in essential tremor patients.•Gyroscopes integrated in smartwatches are useful for tremor quantification.•Good correlation was shown between tremor rating scale and smartwatch gyroscope data analysis.•Test-retest reliability in tremor...
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Published in: | Journal of neuroscience methods 2018-06, Vol.303, p.95-102 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Smartwatches can be adapted to register tremor in essential tremor patients.•Gyroscopes integrated in smartwatches are useful for tremor quantification.•Good correlation was shown between tremor rating scale and smartwatch gyroscope data analysis.•Test-retest reliability in tremor intensity measures was trustworthy.•This wearable obtained a good acceptation by essential tremor patients.
The use of wearable technology is an emerging field of research in movement disorders. This paper introduces a clinical study to evaluate the feasibility, clinical correlation and reliability of using a system based in smartwatches to quantify tremor in essential tremor (ET) patients and check its acceptance as clinical monitoring tool.
The system is based on a commercial smartwatch and an Android smartphone. An investigational Android application controls the process of recording raw data from the smartwatch three-dimensional gyroscopes. Thirty-four ET patients were consecutively enrolled in the experiments and assessed along one year. Arm tremor was videofilmed and scored using the Fahn-Tolosa-Marin Tremor Rating Scale (FTM-TRS). Tremor intensity was quantified with the root mean square of angular velocity measured in the patients’ wrists.
Eighty-two assessments with smartwatches were performed. Spearman’s correlation coefficients (ρ) between clinical tremor (FTM-TRS) scores and smartwatch measures for tremor intensity were 0.590 at rest; ρ = 0.738 in steady posture; ρ = 0.189 in finger-to-nose maneuvers; and ρ = 0.652 in pouring water task. Smartwatch reliability was checked by intraclass realiability coefficients: 0.85, 0.95, 0.91, 0.95 respectively. Most of patients showed good acceptance of the system.
This commodity hardware contributes to quantify tremor objectively in a consulting-room by customized Android smart devices as clinical monitoring tool.
The NetMD system for tremor analysis is feasible, well-correlated with clinical scores, reliable and well-accepted by patients to tremor follow-up. Therefore, it could be an option to objectively quantify tremor in ET patients during their regular follow-up. |
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ISSN: | 0165-0270 1872-678X |
DOI: | 10.1016/j.jneumeth.2018.02.015 |