Quantitative measurements
As part of the non-clinical data analysis, several key performance measurement variables were collected from the Zeno Walkway and are defined in this section. These temporal, spatial, and pressure-related variables were used for the gait analysis and calculated using the ProtoKinetic software PKMASIn addition to these parameters, the center of pressure (COP) cyclogram is investigatedWhen the individual is in single stance, the COP moves forward along the stance foot, or the foot in contact with the ground. When the foot swinging through the air first contacts the ground again at the heel, and the individual is now on both feet, the COP shifts away from the original stance foot as the individuals shifts their weight from that foot to the other. By studying the cyclic pattern of the COP during gait, gait symmetries and efficiencies can be evaluated especially by investigating where the COP trajectory overlaps, or the COP Cyclogram Intersection Point (CISP). The CISP is studied for both the EG and CG. The CISP change is monitored in the anterior–posterior (AP) and medial–lateral (ML) directions and measures the COP trajectory symmetry. The efficiency of the COP path can also be evaluated, especially during single stance. The single stance COP efficiency is calculated by dividing the magnitude of the horizontal COP vector from the beginning to the end of each foot’s single stance COP trajectory by the actual distance the COP travels. If these distances are the same, or the COP exactly follows the vector from the beginning to the end of the single stance, the COP is 100% efficient. The larger the deviations from this vector, the less efficient and more unstable the gait. These gait measures will illustrate how the gait and stability of the individuals are affected during the different trials.