Article

Body-fixed motion sensors have been applied for the assessment of sit-to-stand
(STS) performance. However, the accuracy and concurrent validity of sensor-based
estimations of the body's center of mass (CoM) motion during STS are unclear.
Therefore, this study investigated the accuracy and concurrent validity of
sensor-based measures of CoM motion during STS in older adults. Accuracy and
concurrent validity were investigated by comparing the sensor-based method to a
force plate method. Twenty-seven older adults (20 females,
7 males; age: 72-94
years) performed five STS movements while data were collected with force plates
and motion sensors on the hip and chest. Hip maximal acceleration provided an
accurate estimation of the center of mass (CoM) maximal acceleration (limits of
agreement (LOA) smaller than 5% of the CoM maximal acceleration; estimated and
real CoM maximal acceleration did not differ (p=0.823)). Other hip STS measures
and the chest STS measures did not provide accurate estimations of CoM motion
(LOA ranged from -155.6% to 333.3% of the CoM value; sensor-based measures
overestimated CoM motion (range p: <0.001 to 0.01)). However, the hip sensor did
not overestimate maximal jerk of the CoM (p=0.679).
Moderate to very strong
associations were observed between sensor-based estimations and actual CoM motion
(range r=0.64-0.94, p<0.001). Hence, sensor-based estimations of CoM motion
during STS are possible, but accuracy is limited. The sensor-based method cannot
replace laboratory methods for a mechanical analysis of CoM motion during STS but
it may be a practical alternative for the clinical assessment of STS performance
in older persons.
CI - Copyright (c) 2016 Elsevier B.V. All rights reserved.

Langue : ANGLAIS