Article

OBJECTIVE: To determine the validity of a triaxial body-worn accelerometer for
detection of gait and postures in people aged >80 years. DESIGN: Participants
performed a range of activities (sitting, lying, walking, standing) in both a
controlled and a home setting while wearing the accelerometer. Activities in the
controlled setting were performed in a scripted sequence. Activities in the home
setting were performed in an unscripted manner. Analyzed accelerometer data were
compared against video observation as the reference measure. SETTING:
Independent-living and long-term-care retirement village. PARTICIPANTS: Older
people (N=22; mean age +/- SD, 88.1+/-5y) residing in long-term-care and
independent-living retirement facilities. INTERVENTIONS: Not applicable. MAIN
OUTCOME MEASURES: The level of agreement between video observation and the
accelerometer for the total duration of each activity, and second-by-second
correspondence between video observation and the accelerometer for each activity.
RESULTS: The median absolute percentage errors between video observation and the
accelerometer were <1% for locomotion and lying. The absolute percentage errors
were higher for sitting (median, -22.3%; interquartile range [IQR], -62.8% to
10.7%) and standing (median, 24.7%; IQR, -7.3% to 39.6%). A second-by-second
analysis between video observation and the accelerometer found an overall
agreement of >/=85% for all activities except standing (median, 56.1%; IQR,
34.8%-81.2%). CONCLUSIONS: This single-device accelerometer provides a valid
measure of lying and locomotion in people aged >80 years. There is an error of
approximately 25% when discriminating sitting from standing postures, which needs
to be taken into account when monitoring longer-term habitual activity in this
age group.
CI - Copyright (c) 2014 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS