Abstract
Objective
To determine the concurrent criterion-related validity of 2 activity monitors in comparison
with the criterion method of indirect calorimetry in older adults after total knee
arthroplasty (TKA).
Design
Validation study.
Setting
Subjects completed 9 increasingly demanding daily activities in a research laboratory;
each activity was performed for 7 minutes, for a total of 80 minutes, while the activity
monitors and criterion method were used concurrently.
Participants
Subjects (N=21, 67% women) had a mean age ± SD of 68±7 years and a body mass index
of 29±4.
Interventions
Not applicable.
Main Outcome Measures
Energy expenditure (in kcal/min) measured by accelerometer-based and multisensor-based
monitors and by a criterion method. Validity was assessed by the paired t test, intraclass correlation coefficient (ICC), and Bland-Altman plots comparing
the measurements from the activity monitors with those of the criterion method.
Results
Measurements from the accelerometer-based monitor were significantly lower than those
of the criterion method across all walking and nonwalking activities. The underestimations
ranged from 40% to 100%. The accelerometer-based monitor demonstrated small to moderate
agreement compared with the criterion method (ICCs from 0 to .38). Measurements from
the multisensor-based monitor were significantly lower than those of the criterion
method during several nonwalking activities; yet, the differences were minor (2%–19%).
Measurements from the multisensor-based monitor during walking activities were not
different compared with the criterion method. The multisensor-based monitor demonstrated
moderate to excellent agreement with the criterion method (ICCs from .48 to .81).
Conclusions
The multisensor-based monitor showed better criterion-related validity than the accelerometer-based
monitor and should be considered as a tool to measure physical activity in individuals
after TKA.
Keywords
List of abbreviations:
ACT (Actigraph), EE (energy expenditure), ICC (intraclass correlation coefficient), PA (physical activity), SWA (SenseWear Armband), TKA (total knee arthroplasty), WOMAC (Western Ontario and McMaster Universities Osteoarthritis Index)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: October 30, 2014
Footnotes
Supported by the Central Research Development Fund and by the Pepper Center Scholars Pilot Program (grant no. P30-AG024827), both from the University of Pittsburgh, Pittsburgh, PA.
Disclosures: none.
Identification
Copyright
© 2015 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
