Time-to-boundary measures of postural control during single leg quiet standing

Jay Hertel, Lauren C. Olmsted-Kramer, John H. Challis

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

A novel approach to quantifying postural stability in single leg stance is assessment of time-to-boundary (TTB) of center of pressure (COP) excursions. TTB measures estimate the time required for the COP to reach the boundary of the base of support if it were to continue on its instantaneous trajectory and velocity, thus quantifying the spatiotemporal characteristics of postural control. Our purposes were to examine: (a) the intrasession reliability of TTB and traditional COP-based measures of postural control, and (b) the correlations between these measures. Twenty-four young women completed three 10-second trials of single-limb quiet standing on each limb. Traditional measures included mean velocity, standard deviation, and range of mediolateral (ML) and anterior-posterior (AP) COP excursions. TTB variables were the absolute minimum, mean of minimum samples, and standard deviation of minimum samples in the ML and AP directions. The intrasession reliability of TTB measures was comparable to traditional COP based measures. Correlations between TTB and traditional COP based measures were weaker than those within each category of measures, indicating that TTB measures capture different aspects of postural control than traditional measures. TTB measures provide a unique method of assessing spatiotemporal characteristics of postural control during single limb stance.

Original languageEnglish (US)
Pages (from-to)67-73
Number of pages7
JournalJournal of applied biomechanics
Volume22
Issue number1
DOIs
StatePublished - Feb 2006

Fingerprint

Leg
Pressure
Extremities

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

Cite this

@article{65341ab011e247f5a5ccd333ebbcf31a,
title = "Time-to-boundary measures of postural control during single leg quiet standing",
abstract = "A novel approach to quantifying postural stability in single leg stance is assessment of time-to-boundary (TTB) of center of pressure (COP) excursions. TTB measures estimate the time required for the COP to reach the boundary of the base of support if it were to continue on its instantaneous trajectory and velocity, thus quantifying the spatiotemporal characteristics of postural control. Our purposes were to examine: (a) the intrasession reliability of TTB and traditional COP-based measures of postural control, and (b) the correlations between these measures. Twenty-four young women completed three 10-second trials of single-limb quiet standing on each limb. Traditional measures included mean velocity, standard deviation, and range of mediolateral (ML) and anterior-posterior (AP) COP excursions. TTB variables were the absolute minimum, mean of minimum samples, and standard deviation of minimum samples in the ML and AP directions. The intrasession reliability of TTB measures was comparable to traditional COP based measures. Correlations between TTB and traditional COP based measures were weaker than those within each category of measures, indicating that TTB measures capture different aspects of postural control than traditional measures. TTB measures provide a unique method of assessing spatiotemporal characteristics of postural control during single limb stance.",
author = "Jay Hertel and Olmsted-Kramer, {Lauren C.} and Challis, {John H.}",
year = "2006",
month = "2",
doi = "10.1123/jab.22.1.67",
language = "English (US)",
volume = "22",
pages = "67--73",
journal = "Journal of Applied Biomechanics",
issn = "1065-8483",
publisher = "Human Kinetics Publishers Inc.",
number = "1",

}

Time-to-boundary measures of postural control during single leg quiet standing. / Hertel, Jay; Olmsted-Kramer, Lauren C.; Challis, John H.

In: Journal of applied biomechanics, Vol. 22, No. 1, 02.2006, p. 67-73.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-to-boundary measures of postural control during single leg quiet standing

AU - Hertel, Jay

AU - Olmsted-Kramer, Lauren C.

AU - Challis, John H.

PY - 2006/2

Y1 - 2006/2

N2 - A novel approach to quantifying postural stability in single leg stance is assessment of time-to-boundary (TTB) of center of pressure (COP) excursions. TTB measures estimate the time required for the COP to reach the boundary of the base of support if it were to continue on its instantaneous trajectory and velocity, thus quantifying the spatiotemporal characteristics of postural control. Our purposes were to examine: (a) the intrasession reliability of TTB and traditional COP-based measures of postural control, and (b) the correlations between these measures. Twenty-four young women completed three 10-second trials of single-limb quiet standing on each limb. Traditional measures included mean velocity, standard deviation, and range of mediolateral (ML) and anterior-posterior (AP) COP excursions. TTB variables were the absolute minimum, mean of minimum samples, and standard deviation of minimum samples in the ML and AP directions. The intrasession reliability of TTB measures was comparable to traditional COP based measures. Correlations between TTB and traditional COP based measures were weaker than those within each category of measures, indicating that TTB measures capture different aspects of postural control than traditional measures. TTB measures provide a unique method of assessing spatiotemporal characteristics of postural control during single limb stance.

AB - A novel approach to quantifying postural stability in single leg stance is assessment of time-to-boundary (TTB) of center of pressure (COP) excursions. TTB measures estimate the time required for the COP to reach the boundary of the base of support if it were to continue on its instantaneous trajectory and velocity, thus quantifying the spatiotemporal characteristics of postural control. Our purposes were to examine: (a) the intrasession reliability of TTB and traditional COP-based measures of postural control, and (b) the correlations between these measures. Twenty-four young women completed three 10-second trials of single-limb quiet standing on each limb. Traditional measures included mean velocity, standard deviation, and range of mediolateral (ML) and anterior-posterior (AP) COP excursions. TTB variables were the absolute minimum, mean of minimum samples, and standard deviation of minimum samples in the ML and AP directions. The intrasession reliability of TTB measures was comparable to traditional COP based measures. Correlations between TTB and traditional COP based measures were weaker than those within each category of measures, indicating that TTB measures capture different aspects of postural control than traditional measures. TTB measures provide a unique method of assessing spatiotemporal characteristics of postural control during single limb stance.

UR - http://www.scopus.com/inward/record.url?scp=31544479072&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=31544479072&partnerID=8YFLogxK

U2 - 10.1123/jab.22.1.67

DO - 10.1123/jab.22.1.67

M3 - Article

C2 - 16760569

AN - SCOPUS:31544479072

VL - 22

SP - 67

EP - 73

JO - Journal of Applied Biomechanics

JF - Journal of Applied Biomechanics

SN - 1065-8483

IS - 1

ER -