@article{ref1,
title="A comparison of accelerometer accuracy in older adults",
journal="Research in gerontological nursing",
year="2015",
author="Phillips, Lorraine J. and Petroski, Gregory F. and Markis, Natalie E.",
volume="8",
number="5",
pages="213-219",
abstract="Older adults' gait disorders present challenges for accurate activity monitoring. The current study compared the accuracy of accelerometer-detected to hand-tallied steps in 50 residential care/assisted living residents. Participants completed two walking trials wearing a Fitbit(®) Tracker and waist-, wrist-, and ankle-mounted Actigraph GT1M. Agreement between accelerometer and observed counts was calculated using concordance correlation coefficients (CCC), accelerometer to observed count ratios, accelerometer and observed count differences, and Bland-Altman plots. Classification and Regression Tree analysis identified minimum gait speed thresholds to achieve accelerometer accuracy ≥0.80. Participants' mean age was 84.2 and gait speed was 0.64 m/s. All accelerometers underestimated true steps. Only the ankle-mounted GT1M demonstrated positive agreement with observed counts (CCC = 0.205). Thresholds for 0.80 accuracy were gait speeds ≥0.56 m/s for the Fitbit and gait speeds ≥0.71 m/s for the ankle-mounted GT1M. Gait speed and accelerometer placement affected activity monitor accuracy in older adults. [Res Gerontol Nurs. 20XX; X(XX):XX-XX.].<p /> <p>Language: en</p>",
language="en",
issn="1940-4921",
doi="10.3928/19404921-20150429-03",
url="http://dx.doi.org/10.3928/19404921-20150429-03"
}