Exploring the ActiLife(®) filtration algorithm: converting raw acceleration data to counts.
Though portable accelerometers are ubiquitous in physiology and public health studies, their accuracy as objective measures of physical activity is still being examined. This paper enumerates and analyzes the various biases of the widely used ActiLife(®) software in reporting activity counts from ActiGraph(®) accelerometers. In particular, we focus on the two-stage proprietary filtration algorithm used to convert raw acceleration data, for a sampling rate of 30 Hz, to compressed 1 Hz signals; we develop simple novel methods to analyze the action of the software filter on the raw data in the frequency domain.
Department of Mathematics, Bates College, Lewiston, ME 04240, USA.
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D
Peach
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J
Van Hoomissen
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HL
Callender
D061725:Accelerometry; D000465:Algorithms; D005583:Fourier Analysis; D009043:Motor Activity; D012984:Software; D013223:Statistics as Topic / Q000379:methods*