A Comparison of Accelerometer Accuracy in Older Adults.
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.
Lorraine J
LJ
Phillips
Gregory F
GF
Petroski
Natalie E
NE
Markis
D061725:Accelerometry / Q000295:instrumentation* / Q000592:standards*; D000369:Aged, 80 and over; D040561:Assisted Living Facilities; D005260:Female; D006801:Humans; D008297:Male; D012112:Residential Facilities; D016138:Walking / Q000502:physiology*