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

Abstract:

:Traditional measures of postural stability 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 postural time-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 60s). 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.

journal_name

Gait Posture

journal_title

Gait & posture

authors

Wheat JS,Haddad JM,Scaife R

doi

10.1016/j.gaitpost.2011.09.103

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

345-7

issue

2

eissn

0966-6362

issn

1879-2219

pii

S0966-6362(11)00400-0

journal_volume

35

pub_type

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