Validation of Two Activity Monitors in Slow and Fast Walking Hospitalized Patients
Britt Stævnsbo Pedersen, Morten Tange Kristensen, Christian Ohrhammer Josefsen, Kasper Lundberg Lykkegaard, Line Rokkedal Jønsson, Mette Merete Pedersen
Abstract
To evaluate interventions to promote physical activity, valid outcome measures are important. This study evaluated the validity and reliability of the ActivPAL3™ and the SENS motion® activity monitors with regard to the number of steps taken, walking, and sedentary behavior in hospitalized patients ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" id="M1"><a:mi>n</a:mi><a:mo>=</a:mo><a:mn>36</a:mn></a:math> ) (older medical patients (+65 years) ( <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" id="M2"><c:mi>n</c:mi><c:mo>=</c:mo><c:mn>12</c:mn></c:math> ), older patients (+65) with acute hip fracture ( <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" id="M3"><e:mi>n</e:mi><e:mo>=</e:mo><e:mn>12</e:mn></e:math> ), and patients (+18) who underwent acute high-risk abdominal surgery ( <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" id="M4"><g:mi>n</g:mi><g:mo>=</g:mo><g:mn>12</g:mn></g:math> )). Both monitors showed good (≥60%) percentage agreement with direct observation for standing and no. of steps (all gait speeds) and high agreement (≥80%) for lying. For walking, ActivPAL3™ showed moderate percentage agreement, whereas SENS motion® reached high percentage agreement. The relative reliability was moderate for sedentary behavior for both monitors. The ActivPAL3™ showed poor (walking) to moderate (steps) reliability for walking and steps, whereas SENS motion® showed moderate reliability for both activities. For slow walkers, the relative reliability was moderate for SENS motion® and poor for ActivPAL3™. This trial is registered with the ClinicalTrials.gov identifier NCT04120740.