Abstract：
:Many epidemiological and clinical studies use accelerometry to objectively measure physical activity using the activity counts, vector magnitude, or number of steps. These measures use just a fraction of the information in the raw accelerometry data as they are typically summarized at the minute level. To address this problem, we define and estimate two measures of temporal stride-to-stride gait variability based on raw accelerometry data: Amplitude Deviation (AD) and Phase Deviation (PD). We explore the sensitivity of our approach to on-body placement of the accelerometer by comparing hip, left and right wrist placements. We illustrate the approach by estimating AD and PD in 46 elderly participants in the Developmental Epidemiologic Cohort Study (DECOS) who worn accelerometers during a 400m walk test. We also show that AD and PD have a statistically significant association with the gait speed and sit-to-stand test performance.
journal_name
Gait Posturejournal_title
Gait & postureauthors
Urbanek JK,Harezlak J,Glynn NW,Harris T,Crainiceanu C,Zipunnikov Vdoi
10.1016/j.gaitpost.2016.11.045subject
Has Abstractpub_date
2017-02-01 00:00:00pages
217-223eissn
0966-6362issn
1879-2219pii
S0966-6362(16)30684-1journal_volume
52pub_type
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