Fig. 3

Graphic representation of computed indices for one patient in the sample, based on the “Vertical Capture” task of the Armeo®Spring device being repeated three consecutive times. Similarly to a clock, the numbers indicate movements in a specific direction (e.g. 1–7, or 3–9). Indices were grouped based on the direction of the movement and normalized to the normal reference value for that direction. The median value was then computed and plotted. Due to the normalization procedure, values close to the normal reference are close to the circumference; values greater than normal are outside the circumference (as per HPR) and values lower than normal are inside the circumference (as per meanVel). This representation provides a glimpse of one patient’s UL movement impairment. This subject displayed jerky movements with reduced velocity but displayed sufficient control of the movement trajectory. Directions 1–7 and 2–8 appear to be the most compromised. A better overall accuracy (HPR) was achieved in the horizontal movements (direction 3–9), possibly due to a greater control ability, despite jerkiness (NVelPeaks), which resulted in a lower velocity (meanVel)