Table 2.

Description of motion laboratory variables.

Motion laboratory variable	Description
Stride length	Length of a stride (cm), calculated as the distance between the proximal end position of the foot at ipsilateral heel strike to the proximal end of the next ipsilateral heel strike. It is a global spatiotemporal measure.
Cadence	Steps per minute. It is a global spatiotemporal measure.
Velocity	Stride length multiplied by cadence and divided by two (cm/sec). It is a global spatiotemporal measure.
Step width	Width of a step (cm), calculated as the medial–lateral distance between the proximal end position of the foot at ipsilateral heel strike to the proximal end position of the foot at the next contralateral heel strike. It is a global spatiotemporal measure.
Gait stability ratio	Cadence divided by velocity. A higher gait stability ratio indicates that a larger portion of the gait cycle is spend in double limb support, decreasing the dynamic component of walking and increasing stability (Cromwell and Newton 2004). It is a global spatiotemporal measure.
Total support	Amount of time the foot spends on the ground. It is a global spatiotemporal measure.
Initial double support	Amount of time both feet are on the ground after initial contact. It is a global spatiotemporal measure.
Postural imbalance	Root mean square error of the center of pressure when the participant stands on force plates for 30 s with eyes open or eyes closed.
Dynamic stability	Average distance between the extrapolated center of mass and the base of support during gait, normalized with respect to the height of the participant.