JSM 2015 Preliminary Program

Online Program Home
My Program

Abstract Details

Activity Number: 38
Type: Contributed
Date/Time: Sunday, August 9, 2015 : 2:00 PM to 3:50 PM
Sponsor: Biometrics Section
Abstract #316161 View Presentation
Title: Universal and Individual Characteristics of Postural Sway During Quiet Stance in Healthy Young Adults
Author(s): Charles Smith* and Tomohisa Yamamoto and Taishin Nomura
Companies: North Carolina State University and Osaka University and Osaka University
Keywords: postural sway, circadian variability, posture index, discriminant function analysis, mixed models
Abstract:

The time course of the center of pressure (CoP) during human quiet stance, corresponding to body sway, is a stochastic process, influenced by a variety of features of the underlying neuro-musculo-skeletal system. Sway patterns have been characterized in an empirical way by a number of indices, such as mean sway velocity, rather than by directly estimating an underlying probability density function. Here, we describe a statistical approach with the aim of estimating "universal" indices, namely parameters that are independent of individual body characteristics; under the assumption that they might reflect underlying neural control during quiet stance. Such universal indices are identified by analyzing intra- and inter-subject variability of various indices. We found that universal indices characterize mainly slow aspects of sway, such as scaling exponents of low frequency power-law behavior; while individual-specific indices can be associated with fast oscillatory components of sway. These results support a mechanistic hypothesis claiming that the slow and the fast components of sway are associated, respectively, with neural control and biomechanics.


Authors who are presenting talks have a * after their name.

Back to the full JSM 2015 program





For program information, contact the JSM Registration Department or phone (888) 231-3473.

For Professional Development information, contact the Education Department.

The views expressed here are those of the individual authors and not necessarily those of the JSM sponsors, their officers, or their staff.

2015 JSM Online Program Home