Effects of Frequency Filtering on Intensity and Noise in Accelerometer-Based Physical Activity Measurements.

ABSTRACT: In objective physical activity (PA) measurements, applying wider frequency filters than the most commonly used ActiGraph (AG) filter may be beneficial when processing accelerometry data. However, the vulnerability of wider filters to noise has not been investigated previously. This study explored the effect of wider frequency filters on measurements of PA, sedentary behavior (SED), and capturing of noise. Apart from the standard AG band-pass filter (0.29-1.63 Hz), modified filters with low-pass component cutoffs at 4 Hz, 10 Hz, or removed were analyzed. Calibrations against energy expenditure were performed with lab data from children and adults to generate filter-specific intensity cut-points. Free-living accelerometer data from children and adults were processed using the different filte

SUBMITTER: Fridolfsson J 

PROVIDER: S-EPMC6539652 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature