Article

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.
CI - Copyright (c) 2015 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS