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New actigraph for long-term tremor recording.

Someren, E.J.W. van and Pticeck, M.D. and Speelman, J.D. and Schuurman, P.R. and Esselink, R. and Swaab, D.F. (2006) New actigraph for long-term tremor recording. Movement disorders : official journal of the Movement Disorder Society, 21(8), 1136-1143. ISSN 08853185. doi: 10.1002/mds.20900.

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A new method of movement analysis is validated, allowing an actigraph to discriminate tremor from other movements and store duration and intensity measures of both movement types. For algorithm optimization, wrist acceleration was recorded in nine controls and nine Parkinson's disease patients, while simultaneously rating their observed tremor minute by minute on item 20 of the Unified Parkinson's Disease Rating Scale. An optimization procedure to minimize false positives in controls while maximizing tremor detection in patients resulted in false positive tremor classification in 2.4% +/- 2.5% of the movement time of control subjects (range, 0%-7%), while providing tremor classification in 82.1% +/- 15.4% of the movement time in patients (range, 55%-100%), correlating r = 0.93 with their averaged observed tremor score. A second, generalizability study showed that application of the optimized algorithm resulted in accurate classification of 71% +/- 14% of the observed tremor time (range, 46%-90%) in another 9 patients and in a false positive classification in only 0.5% +/- 0.8% of the time in another 10 controls (range, 0%-2.4%). The commercial availability of this actigraph now for the first time makes it possible to investigate tremor fluctuations over several weeks. An example is given of how long-term monitoring can be of use in evaluation of symptom management.

Item Type:Article
Additional Information:doi: 10.1002/mds.20900
Institutes:Netherlands Institute for Neuroscience (NIN)
ID Code:3704
Deposited On:13 Feb 2009 17:14
Last Modified:10 Dec 2009 13:14

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