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. 2014 Jul 14;14(7):12598–12622. doi: 10.3390/s140712598

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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 3. — Quadriceps femoris muscle force under maximum voluntary contraction (MVC) and electrically evoked contraction (FES) at 100 Hz, 50 Hz and 20 Hz stimulation frequency [73]. The graph shows that the force generated against time in electrically evoked contraction depends on the stimulation frequency.