Chang YJ, Hsu MJ, Chen SM, Lin CH, Wong AMK. Decreased central fatigue in multiple sclerosis patients after 8 weeks of surface functional electrical stimulation. J Rehabil Res Dev. 2011;48(5):555-64.DOI:10.1682/JRRD.2010.03.0038

Figure 2. Group mean ± standard deviation of (a) normalized maximum voluntary contraction, (b) voluntary activation level, and (c) twitch force during fatiguing process before (filled circles) and after (empty circles) 8 weeks of surface functional electrical stimulation (FES) training. All values are represented as percentage of those before fatigue. Values at 20 min represent General Fatigue Index (a), Central Fatigue Index (b), and Peripheral Fatigue Index (c). *Indicates significant difference between values before and after 8 weeks of surface FES training at 20 min.