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. 2019 Feb 15;10:119. doi: 10.3389/fphys.2019.00119

FIGURE 2.

FIGURE 2

Time course of potentiated twitch torque (Ttw,pot) of the knee extensor (KE) muscles (expressed as percentage of the initial value) during the exercise protocol (expressed as percentage of total repetitions) in children (C), adults (A) and endurance athletes (EA). §§ and §§§: significantly different from the first MVC at P < 0.01 and P < 0.001, respectively; ###: significantly different between C and A at P < 0.001; ££ and £££: significantly different between EA and A at P < 0.01 and P < 0.001, respectively.