Fig. 1

Assessgame elements and sensor placement. a Predefined target path. After a 25 s accommodation phase players follow the target path for 30 s challenging them within 90% of their active range of motion. The end phase of 5 s is not analyzed. b Avatar owl crossing the line from accommodation phase to target path. Steering the owl, the goal is to follow the star-studded target path as accurately as possible without any involuntary movements. c Placement of the accelerometer sensors proximal and distal of all target joints. Abbreviations: sec = seconds