| Comparison of methods for removing electromagnetic noise from electromyographic signals. | |
| | |
MedLine Citation:
|
PMID: 22227849 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
The purpose of this investigation was to compare three different methods of removing noise from monopolar electromyographic (EMG) signals: (a) electrical shielding with a Faraday cage, (b) denoising with a digital notch-filter and (c) applying a bipolar differentiation with another monopolar EMG signal. Ten men and ten women (mean age = 24.0 years) performed isometric muscle actions of the leg extensors at 10-100% of their maximal voluntary contraction on two separate occasions. One trial was performed inside a Faraday tent (a flexible Faraday cage made from conductive material), and the other was performed outside the Faraday tent. The EMG signals collected outside the Faraday tent were analyzed three separate ways: as a raw signal, as a bipolar signal, and as a signal digitally notch filtered to remove 60 Hz noise and its harmonics. The signal-to-noise ratios were greatest after notch-filtering (range: 3.0-33.8), and lowest for the bipolar arrangement (1.6-10.2). Linear slope coefficients for the EMG amplitude versus force relationship were also used to compare the methods of noise removal. The results showed that a bipolar arrangement had a significantly lower linear slope coefficient when compared to the three other conditions (raw, notch and tent). These results suggested that an appropriately filtered monopolar EMG signal can be useful in situations that require a large pick-up area. Furthermore, although it is helpful, a Faraday tent (or cage) is not required to achieve an appropriate signal-to-noise ratio, as long as the correct filters are applied. |
| | |
Authors:
|
Jason M Defreitas; Travis W Beck; Matt S Stock |
Related Documents
:
|
21768069 - The word frequency effect: a review of recent developments and implications for the cho... 22572219 - Agio(3)-modified agi/tio(2) composites for photocatalytic degradation of p-chlorophenol... 6249259 - Low-level chemiluminescence of bovine heart submitochondrial particles. 21678119 - Striking presence of egyptian blue identified in a painting by giovanni battista benven... 21603929 - Armoured spiderman: morphological and behavioural adaptations of a specialised araneoph... 21668149 - Magnetoelectric directional nonreciprocity in gas-phase molecular nitrogen. 11399309 - Circadian phase shifting: relationships between photic and nonphotic phase-response cur... 16519359 - A flexible structure for fully scalable motion-compensated 3-d dwt with emphasis on the... 17069309 - In search of basal distortion product generators. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-1-06 |
Journal Detail:
|
Title: Physiological measurement Volume: 33 ISSN: 1361-6579 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
|
Created Date: 2012-1-9 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9306921 Medline TA: Physiol Meas Country: - |
Other Details:
|
Languages: ENG Pagination: 147-158 Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Jones Fracture Fixation: A Biomechanical Comparison of Partially Threaded Screws Versus Tapered Vari...
Next Document: Use of bilateral information to determine the walking direction during orientation to a pheromone so...