Figure 1
Instrumented handle photography and representation of all four experimental conditions. (A) Photography of the handle used in the experiment and representation of the force components recorded by the single-axis (ellipse) and multi-axis F/T transducers (dashed rectangle). (B-E) The vertical force component of LF (FZ) time-series (black lines) of trials performed at 0.77 Hz (B and D) and at 1.53 Hz (C and E) in the targeting condition (B and C), in which two horizontal lines (gray lines) displayed in the computer monitor represented the prescribed upper and lower targets, and in the tracking condition (D and E), in which a sinusoidal template (gray line) shown in the computer monitor represented the prescribed target.