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. 2014 Jan 27;14(2):2052–2070. doi: 10.3390/s140202052

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — Tracked mean frequency trend of biceps brachii. (a) Experiment 1. (b) Experiment 2. In both Experiment 1 and Experiment 2, the tracked slope of the mean frequency variance converges to a negative value after a short period (around 5 s), indicating a linear decrease of the mean frequency with the muscle's working time.