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Specificity of surface EMG recordings for gastrocnemius during upright standing
The relatively large pick-up volume of surface electrodes has for long motivated the concern that muscles other than that of interest may contribute to surface electromyograms (EMGs). Recent findings suggest however the pick-up volume of surface electrodes may be smaller than previously appreciated,...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5643316/ https://www.ncbi.nlm.nih.gov/pubmed/29038435 http://dx.doi.org/10.1038/s41598-017-13369-1 |
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author | Vieira, Taian Martins Botter, Alberto Muceli, Silvia Farina, Dario |
author_facet | Vieira, Taian Martins Botter, Alberto Muceli, Silvia Farina, Dario |
author_sort | Vieira, Taian Martins |
collection | PubMed |
description | The relatively large pick-up volume of surface electrodes has for long motivated the concern that muscles other than that of interest may contribute to surface electromyograms (EMGs). Recent findings suggest however the pick-up volume of surface electrodes may be smaller than previously appreciated, possibly leading to the detection of surface EMGs insensitive to muscle activity. Here we combined surface and intramuscular recordings to investigate how comparably action potentials from gastrocnemius and soleus are represented in surface EMGs detected with different inter-electrode distances. We computed the firing instants of motor units identified from intramuscular EMGs detected from gastrocnemius and soleus while five participants stood upright. We used these instants to trigger and average surface EMGs detected from multiple skin regions along gastrocnemius. Results from 66 motor units (whereof 31 from gastrocnemius) revealed the surface-recorded amplitude of soleus action potentials was 6% of that of gastrocnemius and did not decrease for inter-electrode distances smaller than 4 cm. Gastrocnemius action potentials were more likely detected for greater inter-electrode distances and their amplitude increased steeply up to 5 cm inter-electrode distance. These results suggest that reducing inter-electrode distance excessively may result in the detection of surface EMGs insensitive to gastrocnemius activity without substantial attenuation of soleus crosstalk. |
format | Online Article Text |
id | pubmed-5643316 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-56433162017-10-19 Specificity of surface EMG recordings for gastrocnemius during upright standing Vieira, Taian Martins Botter, Alberto Muceli, Silvia Farina, Dario Sci Rep Article The relatively large pick-up volume of surface electrodes has for long motivated the concern that muscles other than that of interest may contribute to surface electromyograms (EMGs). Recent findings suggest however the pick-up volume of surface electrodes may be smaller than previously appreciated, possibly leading to the detection of surface EMGs insensitive to muscle activity. Here we combined surface and intramuscular recordings to investigate how comparably action potentials from gastrocnemius and soleus are represented in surface EMGs detected with different inter-electrode distances. We computed the firing instants of motor units identified from intramuscular EMGs detected from gastrocnemius and soleus while five participants stood upright. We used these instants to trigger and average surface EMGs detected from multiple skin regions along gastrocnemius. Results from 66 motor units (whereof 31 from gastrocnemius) revealed the surface-recorded amplitude of soleus action potentials was 6% of that of gastrocnemius and did not decrease for inter-electrode distances smaller than 4 cm. Gastrocnemius action potentials were more likely detected for greater inter-electrode distances and their amplitude increased steeply up to 5 cm inter-electrode distance. These results suggest that reducing inter-electrode distance excessively may result in the detection of surface EMGs insensitive to gastrocnemius activity without substantial attenuation of soleus crosstalk. Nature Publishing Group UK 2017-10-16 /pmc/articles/PMC5643316/ /pubmed/29038435 http://dx.doi.org/10.1038/s41598-017-13369-1 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Vieira, Taian Martins Botter, Alberto Muceli, Silvia Farina, Dario Specificity of surface EMG recordings for gastrocnemius during upright standing |
title | Specificity of surface EMG recordings for gastrocnemius during upright standing |
title_full | Specificity of surface EMG recordings for gastrocnemius during upright standing |
title_fullStr | Specificity of surface EMG recordings for gastrocnemius during upright standing |
title_full_unstemmed | Specificity of surface EMG recordings for gastrocnemius during upright standing |
title_short | Specificity of surface EMG recordings for gastrocnemius during upright standing |
title_sort | specificity of surface emg recordings for gastrocnemius during upright standing |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5643316/ https://www.ncbi.nlm.nih.gov/pubmed/29038435 http://dx.doi.org/10.1038/s41598-017-13369-1 |
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