FES parameters and hand dexterity. A: current delivered on the skin in the 10 subjects for each of the 4 muscles. Top panel: ranges of sensory threshold. Middle panel: pain thresholds. Bottom panel: intensities of current delivered during FES. Values are expressed in mAmp. Abbreviations: FRC: flexor radialis carpi; ERC: extensor radialis carpi. B: hand dexterity evaluated with the Mechanical counter test (MCT), dominant side on left panels and non dominant side on right panels. Top panels: results of MCT- Unilateral (MCT-U). Bottom panels: results of MCT-Alternate (MCT-A). The increment in number of clicks was linear as a function of recording time, as confirmed by the regression analysis. Dashed lines: 99% confidence interval; dotted lines: 99% prediction intervals.