TABLE 1.
Metric | Type | Basic Description |
---|---|---|
Path length (PL) | Vamount | Distance COP traveled during a given trial (Figure 3A) |
Center-of-pressure area (COP area) | Vamount | Area of an ellipse fitted to 95% of the data (Figure 3B) |
Standard deviation (SD) | Vamount | The dispersion of positions of the COP around the mean position of the COP in either the anterior-posterior or medial-lateral time series (the lighter lines in Figure 4A and B) |
Sample entropy (SampEn) | Vstructure | Probability that a small segment of the COP trajectory will be reproduced at a later time in the time series (Figure 5) |
Renyi entropy (RenyiEn) | Vstructure | Probability that a measured COP position will reside in a given location (Figure 6) |
Abbreviations: Vamount, amount of variability; Vstructure, structure of the variability.