Stiffness control of balance during quiet standing and dual task in older adults: the MOBILIZE Boston Study.

Abstract:

:Distractions affect postural control, but this mechanism is not well understood. Diversion of resources during cognitive stress may lead to decreased motor drive and postural muscle tone. This may appear as decreased postural stiffness and increased postural sway amplitude. We hypothesized that dual tasking leads to decreased stiffness and increased sway amplitude. Postural sway (center of pressure; COP) data were used from 724 participants aged 77.9 ± 5.3 yr, a representative sample of community-dwelling older adults, the MOBILIZE Boston Study cohort. Subjects stood barefoot with eyes open for 30 s per trial on a force plate. Five trials were performed each with and without a serial subtractions-by-3 task. Sway data were fit to a damped oscillator inverted pendulum model. Amplitudes (COP and center of mass), mechanical stiffness, and damping of the sway behavior were determined. Sway amplitudes and damping increased with the dual task (P < 0.001); stiffness decreased only mediolaterally (P < 0.001). Those with difficulty doing the dual task exhibited larger sway and less damping mediolaterally (P ≤ 0.001) and an increased stiffness with dual task anteroposteriorly (interaction P = 0.004). Dual task could still independently explain increases in sway (P < 0.001) after accounting for stiffness changes. Thus the hypothesis was supported only in mediolateral sway. The simple model helped to explain the dual task related increase of sway only mediolaterally. It also elucidated the differential influence of cognitive function on the mechanics of anteroposterior and mediolateral sway behaviors. Dual task may divert the resources necessary for mediolateral postural control, thus leading to falls.

journal_name

J Neurophysiol

authors

Kang HG,Lipsitz LA

doi

10.1152/jn.00820.2009

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

3510-7

issue

6

eissn

0022-3077

issn

1522-1598

pii

jn.00820.2009

journal_volume

104

pub_type

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