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. 2018 Jan 27;30(1):86–91. doi: 10.1589/jpts.30.86

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2018©by the Society of Physical Therapy Science. Published by IPEC Inc.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/)

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Fig. 1. — Measurement of IPS. The area of postural sway was calculated as the mean sway area of 5 positions. Total recording time for one IPS measurement was 50 seconds because postural sway was measured for ten seconds at each position. IPS=log [(area of stability limit + area of postural sway)/area of postural sway] IPS: index of postural stability.