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. 2021 Aug 19;12:731961. doi: 10.3389/fphys.2021.731961

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Copyright © 2021 Elkes, Andonovski, Vidal, Farago, Modafferi, Claypool and LeBlanc.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Representative soleus twitch trace identifying the key quantifiable measures of contraction. P_t, peak twitch; TPT, time to peak tension; ½ RT, half-relaxation time; +dP/dt, rate of force development; and −dP/dt, rate of force relaxation.