title: Concurrent Validity of activPAL and activPAL3 Accelerometers in Older Adults.
abstract: The aim of this study was to assess concurrent validity between activPAL and activPAL3 accelerometers in a sample of 53 community-dwelling older adults ≥ 65 years. Physical activity (PA) was measured simultaneously with activPAL and activPAL3 while performing scripted activities. The level of agreement between both devices was calculated for sitting/lying, standing, and walking. In addition, PA was measured over one week using activPAL to estimate the expected agreement with activPAL3 in real life. Overall agreement between activPAL and activPAL3 was 97%. Compared with activPAL, the largest disagreement was seen for standing, with 5% categorized as walking by activPAL3. For walking and sitting/lying, the disagreement was 2%, respectively. The expected daily differences between activPAL3 and activPAL were +15.0 min (95% CI: 11.3-18.8) for walking and +29.5 min (95% CI: 6.2-52.7) for standing. ActivPAL and activPAL3 showed good agreement in older adults. However, if using these devices interchangeably, observed differences might still bias results.
authors.affiliation: Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany.
authors.forename: Jochen
authors.initials: J
authors.lastname: Klenk
authors.forename: Gisela
authors.initials: G
authors.lastname: Büchele
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lindemann
authors.forename: Sabrina
authors.initials: S
authors.lastname: Kaufmann
authors.forename: Raphael
authors.initials: R
authors.lastname: Peter
authors.forename: Roman
authors.initials: R
authors.lastname: Laszlo
authors.forename: Susanne
authors.initials: S
authors.lastname: Kobel
authors.forename: Dietrich
authors.initials: D
authors.lastname: Rothenbacher
mesh_terms: D061725:Accelerometry / Q000295:instrumentation*; D000203:Activities of Daily Living; D000368:Aged; D005260:Female; D006801:Humans; D057187:Independent Living; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results