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. 2018 May 15;9:517. doi: 10.3389/fphys.2018.00517

FIGURE 2.

FIGURE 2

Changes in the TS muscle strength in the I–IV series of fatigue stimulation. There are normalized averaged force (mean ± SD) (normalization with respect to the first series) values. The averaging procedure has been applied to the data registered in six animals of the fatigue-induced group of rats (group 1), and the data were averaged with respect to the corresponding stimulation series. Asterisks denote significant differences (P < 0.05) between the muscle strength of different electrical stimulation series.