Fig. 1

a Picture showing a participant playing the exergame. The goal for the child was to steer the airplane through the middle of the clouds-free path. Participants controlled the airplane by elbow flexion (airplane angle upward) and extension (airplane angle downward) movements. Electrical goniometer sensors, YouGrabber® data gloves with accelerometers and the airplane scenario are shown. b While the averaged accelerometer data of the left and right blue YouGrabber “boxes” were used to control the angle of the airplane, electrogoniometers recorded the actual elbow flexion and extension movements. c Besides the automatically provided game score (i.e. the percentage of time correctly on the path), we calculated various measures including the correlation between the ideal path and the airplane trajectory (as another measure reflecting task performance), and the correlation between the derivative of the ideal path and the elbow movements. This latter correlation served as our measure of selective voluntary motor control (SVMC)