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Feasibility Testing of Hydrophobic Carbon Electrodes for Acquisition of Underwater Surface Electromyography Data

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Abstract

Underwater surface electromyography (sEMG) signals are especially of interest for rehabilitation and sports medicine applications. Silver/silver chloride (Ag/AgCl) hydrogel electrodes, although the gold standard for sEMG data collection, require waterproofing for underwater applications. Having to apply waterproof tape over electrodes impedes the deployment of sEMG in immersed conditions. As a better alternative for underwater applications, we have developed carbon black/polydimethylsiloxane (CB/PDMS) electrodes for collecting sEMG signals under water. We recruited twenty subjects to collect simultaneous recordings of sEMG signals using Ag/AgCl and CB/PDMS electrodes on biceps brachii, triceps brachii, and tibial anterior muscles. The Ag/AgCL electrodes were covered in waterproof tape, and the CB/PDMS electrodes were not. We found no differences in sEMG signal amplitudes between both sensors, for the three muscles. Moderate mean correlation between Ag/AgCl and CB/PDMS electrodes was found on the linear envelopes (≥ 0.7); correlation was higher for power spectral densities (≥ 0.84). Ag/AgCl electrodes performed better in response to noise, whilst the CB/PDMS electrodes were more sensitive to myoelectric activity in triceps and tibialis, and exhibited better response to motion artifacts in the measurements on the triceps and tibialis. Results suggest that sEMG signal collection is possible under water using CB/PDMS electrodes without requiring any waterproof or adhesive tape.

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Acknowledgments

This work was supported by the Office of Naval Research N00014-15-1-2236.

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Authors and Affiliations

  1. Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA

    Hugo Posada-Quintero, Caitlin Eaton-Robb & Ki H. Chon

  2. College of Nursing, University of Massachusetts Amherst, Amherst, MA, USA

    Yeonsik Noh

  3. Department of Electrical and Computer Engineering, University of Massachusetts Amherst, Amherst, MA, USA

    Yeonsik Noh

  4. Navy Experimental Diving Unit, Panama City, FL, USA

    John P. Florian

Authors
  1. Hugo Posada-Quintero
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Correspondence to Hugo Posada-Quintero.

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Associate Editor Thurmon E. Lockhart oversaw the review of this article.

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Posada-Quintero, H., Noh, Y., Eaton-Robb, C. et al. Feasibility Testing of Hydrophobic Carbon Electrodes for Acquisition of Underwater Surface Electromyography Data. Ann Biomed Eng 46, 1397–1405 (2018). https://doi.org/10.1007/s10439-018-2042-6

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  • DOI: https://doi.org/10.1007/s10439-018-2042-6

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