Table 1.

Game actions with the Recovery Rapids™ gaming system, accompanying therapeutic gestures, and relevant kinematic metric for identifying the start and end points of each gesture

Game Action		Therapeutic Gesture	Kinematic metric for identifying the start and end point
Description	Abbreviated Term
Row boat forward	Row	Shoulder flexion/extension with elbow extension	Z6− Z10
Steer boat toward hemiparetic side	Raise-Arm	Shoulder abduction with elbow extension	X10 − X6 when the affected side is right and X6 − X10 when the affected side is left
Pick up bottle	Bottle	Elbow flexion/extension and grasp/release	−β*
Capture parachute	Parachute	Shoulder flexion with elbow extension and forearm supination	Z6 − Z10
Swat away bats	Bats	Overhead reaching	Y10 − Y6

^*elbow angle β = atan2[||L₁ × L₂||, (L₁. L₂)], atan2 is the four-quadrant inverse tangent function, L₁ = [X₆ − X₇ Y₆ − Y₇ Z₆ − Z₇], L₂ = [X₇−X₈ Y₇−Y₈ Z₇−Z₈ , L₁ × L₂ and L₁. L₂ are the cross and dot operations, respectively, and ||.|| is the norm operator.

The parameters X, Y, and Z refer to the joint locations along the X, Y, and Z axes (Figure 2), respectively