Cescon, Corrado and Rebecchi, Paola and Merletti, Roberto (2008) Effect of electrode array position and subcutaneous tissue thickness on conduction velocity estimation in upper trapezius muscle. Journal of Electromyography and Kinesiology, 18 (4). pp. 628-636. ISSN 1050-6411
Full text not available from this repository.Abstract
Muscle fiber conduction velocity (CV) was estimated in 20 healthy subjects with a multichannel technique using a linear electrode array placed on the upper trapezius (UT) muscle during isometric voluntary contractions at 20% of the maximal voluntary effort. The array had 16 contacts spaced by 5mm and was centered in the middle of the line connecting C7 and the acromion. The effect of array displacement was investigated by shifting it either cranially or caudally by 1, 2 and 3cm. The effect of array misalignment was investigated by rotating it either clockwise or counterclockwise, by 10 degrees , 20 degrees and 30 degrees . The thickness of subcutaneous fat was measured by ultrasonic echography (range was 3-18mm). The average location of the innervation zone of the UT is in the middle of the line connecting C7 to the acromion, however, individual differences of up to 2cm were observed. The lateral side, near the acromion, should be preferred for electrode placement because of the thinner fat layer. The double differential (DD) montage should be preferred to the single differential (SD) electrode configuration. In this case, displacements of +/-1cm or misalignments of +/-10 degrees do not imply statistically significant bias in the estimate of CV. The same applies to amplitude and frequency variables estimated from the SD signals. CV estimates based on DD signals are lower because they are less affected by the thickness of the subcutaneous fat than estimates based on SD signals.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Uncontrolled Keywords: | Surface electromyography, Upper trapezius, Electrode arrays, Fibre orientation |
| Subjects: | Engineering > General engineering > Bioengineering, biomedical engineering & clinical engineering |
| Depositing User: | Corrado Cescon |
| Date Deposited: | 13 Sep 2013 09:22 |
| Last Modified: | 18 May 2016 07:36 |
| URI: | http://repository.supsi.ch/id/eprint/2730 |
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