Dynamical structure of center of pressure fluctuations in elderly people.

Abstract:

:This study investigates whether aging has an influence on the dynamics of the fluctuations of the displacement of the center of pressure (COP), during quiet standing. Two groups of healthy subjects were compared (11 young and 12 elderly) for two visual feedback conditions (eyes open and eyes closed). The data were analyzed using (i) classical stabilometric variables (length and surface) and (ii) recurrence quantification analysis (percentage of determinism and entropy), for the dynamical structure of COP signals. The length of the COP displacement was found to be the best discriminating stabilometric variable for both visual and aging effects. Visual feedback influenced recurrence quantification analysis (RQA) variables only for the elderly group. Both RQA outputs in the anterior posterior direction were sufficient to distinguish the young and elderly groups. The entropy estimation computed by RQA was significantly reduced for postural fluctuations in elderly people. We conclude that classical stabilometric variables and RQA outputs provide complementary information for the characterization of ageing effects on postural sway.

journal_name

Gait Posture

journal_title

Gait & posture

authors

Seigle B,Ramdani S,Bernard PL

doi

10.1016/j.gaitpost.2009.05.005

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

223-6

issue

2

eissn

0966-6362

issn

1879-2219

pii

S0966-6362(09)00139-8

journal_volume

30

pub_type

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