Between-day reliability of time-to-contact measures used to assess postural stability.

WHEAT, Jonathan, HADDAD, J and SCAIFE, Robert (2012). Between-day reliability of time-to-contact measures used to assess postural stability. Gait & Posture, 35 (2), 345-347.

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Abstract

Traditional measures of posturalstability consider movement of the center of pressure (COP) or the center of mass (COM) without regard to the boundary of support (BOS). A potentially more appropriate measure is posturaltime-to-contact (TtC) which defines the spatio-temporal proximity of the COM or COP to the BOS. Given the increasing popularity of TtC measures, it is important to determine their reliability. Therefore, the purpose of this study was to determine the effects of the number of trials and trial duration on the reliability of postural TtC measures. COP data were collected (100 Hz) in 16 young healthy participants during 10 trials (60-s duration) of quiet standing with eyes open on two occasions – seven days apart. Postural TtC of each trial was calculated using two different methods. The intersession reliability of the TtC measures was assessed by calculating between session intraclass correlation coefficients (ICC(2,1)) using different combinations of the number of trials (1–10) and trial duration (10, 20, 30, 40, 50 and 60 s). Both TtC methods were very reliable. Additionally, both measures of TtC were more reliable than the standard deviation of the anterior–posterior COP and slightly more reliable than path length. This difference was most pronounced when fewer and shorter trials were used.

Item Type:	Article
Uncontrolled Keywords:	UoA26
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Centre for Sport and Exercise Science Centre for Sports Engineering Research
Identification Number:	https://doi.org/10.1016/j.gaitpost.2011.09.103
Page Range:	345-347
Depositing User:	Rachel Davison
Date Deposited:	15 May 2012 15:31
Last Modified:	18 Mar 2021 20:30
URI:	https://shura.shu.ac.uk/id/eprint/5016

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