Document Detail

Joint amplitude and frequency analysis of tremor activity.
MedLine Citation:
PMID:  10076756     Owner:  NLM     Status:  MEDLINE    
Clinical tremor analysis mostly is used for the measurement of tremor frequency. The analysis is based on short segments of EMG recordings and on clinical ratings of tremor intensity. Accelerometry appears to have some practical advantages. The present study was concerned with the development of a methodology for assessing tremor activity using the three parameters, frequency (Hz), amplitude (g), and occurrence of tremor (in per cent of time). These parameters were derived from joint amplitude frequency analysis of the calibrated accelerometer raw signal and from appropriate decision rules. This methodology was used in connection with 27 patients with Parkinson's disease, to investigate the aforesaid parameters of tremor activity. Postural tremor had a higher occurrence time (right-hand only) and higher frequency (left-hand only) than resting tremor, however, the average amplitudes did not differ. The correlations between right-hand and left-hand measures were higher during postural tremor test. Frequency was not correlated to amplitude or occurrence time, however, moderate correlations did exist between amplitude and occurrence time. In addition to the assessment of tremor activity, multi-channel accelerometry may be used for the detection of posture and motion. Further applications of this methodology, for example, in 24 hr ambulatory monitoring of tremor, are discussed.
F Foerster; M Smeja
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Electromyography and clinical neurophysiology     Volume:  39     ISSN:  0301-150X     ISO Abbreviation:  Electromyogr Clin Neurophysiol     Publication Date:    1999 Jan-Feb
Date Detail:
Created Date:  1999-05-03     Completed Date:  1999-05-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0327533     Medline TA:  Electromyogr Clin Neurophysiol     Country:  BELGIUM    
Other Details:
Languages:  eng     Pagination:  11-9     Citation Subset:  IM    
Forschungsgruppe Psychophysiologie, Psychologisches Institut der Universität Freiburg, Germany.
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MeSH Terms
Aged, 80 and over
Electromyography / classification*
Fourier Analysis
Hand / physiopathology
Middle Aged
Monitoring, Ambulatory
Parkinson Disease / physiopathology*
Posture / physiology
Rest / physiology
Signal Processing, Computer-Assisted
Time Factors
Tremor / physiopathology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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