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      Effect of ActiGraph GT3X+ Position and Algorithm Choice on Step Count Accuracy in Older Adults.

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          Abstract

          Accelerometer step count accuracy may be affected by gait speed, device positioning, and analysis algorithm selection. We assessed ActiGraph GT3X+ step count accuracy related to device placement and analysis algorithm in older adults with walking aids (n = 13) and without walking aids (n = 22). Participants (81.5 ± 5.0 years of age) completed a timed 100-m walk wearing five GT3X+ monitors (hips, ankles, lumbar spine). Individuals with walking aids had slower gait speeds (0.8 ± 0.20 m/s versus 1.2 ± 0.20 m/s without walking aids, p < .001). Intraclass correlation coefficient values for observed versus monitored steps were highest when ankle placement and the low frequency extension (LFE) algorithm were used (left ankle ICC = .989, right ankle ICC = .998). Using the GT3X+ ankle placement and analyzing data with the LFE algorithm resulted in the most accurate step counts in older adults.

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          Author and article information

          Journal
          J Aging Phys Act
          Journal of aging and physical activity
          Human Kinetics
          1543-267X
          1063-8652
          Jul 2015
          : 23
          : 3
          Affiliations
          [1 ] School of Physical Therapy, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
          Article
          2014-0033
          10.1123/japa.2014-0033
          25102469
          3e662d93-08a6-4fea-83f2-f0e316c4bb36
          History

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