McPoil T G, Cornwall M W
Department of Physical Therapy, Northern Arizona University, Flagstaff 86011, USA.
J Am Podiatr Med Assoc. 1998 Jun;88(6):259-67. doi: 10.7547/87507315-88-6-259.
The objective of this study was to measure the between-trial variability of the center of pressure pattern integral (COPPI) at the shoe-floor interface and within the shoe. Ten trials of the COPPI were recorded simultaneously at the shoe-floor interface and within the shoe as ten subjects walked over ground in standardized footwear and with two types of foot orthoses. While the results showed that the within-shoe shoe-only and soft orthoses conditions caused the greatest decrease in the COPPI, it was extremely inconsistent-between trials, whether measured at the shoe-floor interface or within the shoe. This suggests that the COPPI is not an acceptable method of assessing the effectiveness of foot orthoses.
