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. 2020 Oct 19;12(10):2406. doi: 10.3390/polym12102406

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Examples of SEMG recordings from one subject during intermittent muscle contraction measured by 5 mm and 30 mm diameter electrodes. (a,b) Show an example of raw EMG signals obtained via electrode diameter Ø 5 mm and Ø 30 mm, respectively. (b) clearly shows lower baseline EMG than (a); (c,d) show filtered (20–500 Hz) in analog and full-wave rectified EMG to analyze the amplitude. Three contractions among five, except the first and last trials, were used to calculate the average activated EMG for comparison.