Table 1.

Definitions of measurements from the NeuroCom® VSR Sport.

Measure	Definition
Reaction Time	Time from the cue to the time the COP sway exceeds the random range indicating volitional movement has begun
Movement Velocity	Average speed of the COG shift toward the target measured in degrees per second
Endpoint Excursion	Distance traveled by the COG on the primary attempt to reach the target expressed as a percentage of the LOS
Maximum Excursion	Furthest distance traveled by the COG in a given trial
Directional Control	Amount of movement in the intended direction minus the amount of off-axis movement given as a percentage

COP: Center of Pressure; COG: Center of Gravity; LOS: Limits of Stability