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. 2013 Dec 9;8(12):e81418. doi: 10.1371/journal.pone.0081418

Figure 7. Effects of anodal tDCS on rating of perceived exertion during sustained contractions.

Figure 7

A. Rating of perceived exertion (RPE), B. Amount of time spent at RPE of 8–10 (n = 8). A. Mean RPE was the same before (baseline), during (minute-1∶00 and minute-8∶30), and at the mean time to task failure (TTF) of the fatiguing contraction for both the Anodal and Sham tDCS conditions. From baseline to minute-8∶30, the mean increase in RPE over time did not differ between the two stimulation conditions. Between minute-8∶30 and the mean TTF, the rate of change for RPE was significantly slower during Anodal tDCS condition than the Sham tDCS condition (*p = 0.03). B. Subjects sustained their contraction time while at an RPE level between 8 and 10 for an average of 8.0±2.9 minutes with anodal stimulation compared to 4.6±2.9 minutes with sham stimulation (*p = 0.04).