Comparison of the Wright ataxiameter and the Kistler force platform in the measurement of sway.

A comparison has been made between two methods of measuring body sway during quiet standing. In the first method a Wright ataxiameter was used to measure the trunk movement in the anteroposterior direction; whilst in the second method a Kistler force platform was used to monitor the locus of the resultant ground reaction force. The good correlation between the two sets of data has resulted in a regression equation to convert one set into the equivalent other set. This equation should be useful while comparing the sway data from various research centres.