Considerations in processing accelerometry data to explore physical activity and sedentary time in older adults

Cleland, C. L., Ferguson, S., McCrorie, P. , Schipperijn, J., Ellis, G. and Hunter, R. F. (2020) Considerations in processing accelerometry data to explore physical activity and sedentary time in older adults. Journal of Aging and Physical Activity, 28(4), pp. 623-633. (doi: 10.1123/japa.2019-0244) (PMID:31968305)

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Processing decisions for accelerometry data can have important implications for outcome measures, yet little evidence exists exploring these in older adults. The aim of the current study was to investigate the impact of three potentially important criteria on older adults, physical activity, and sedentary time. Participants (n = 222: mean age 71.75 years [SD = 6.58], 57% male) wore ActiGraph GT3X+ for 7 days. Eight data processing combinations from three criteria were explored: low-frequency extension (on/off), nonwear time (90/120 min), and intensity cut points (moderate-to-vigorous physical activity ≥1,041 and >2,000 counts/min). Analyses included Wilcoxon signed-rank test, paired t tests, and correlation coefficients (significance, p < .05). Results for low-frequency extension on 90-min nonwear time and >1,041 counts/min showed significantly higher light and moderate-to-vigorous physical activity and lower sedentary time. Cut points had the greatest impact on physical activity and sedentary time. Processing criteria can significantly impact physical activity and/or sedentary time, potentially leading to data inaccuracies, preventing cross-study comparisons and influencing the accuracy of population surveillance.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cleland, Dr Claire and Mccrorie, Dr Paul
Authors: Cleland, C. L., Ferguson, S., McCrorie, P., Schipperijn, J., Ellis, G., and Hunter, R. F.
College/School:College of Medical Veterinary and Life Sciences > School of Health & Wellbeing > MRC/CSO SPHSU
Journal Name:Journal of Aging and Physical Activity
Publisher:Human Kinetics
ISSN (Online):1543-267X
Published Online:22 January 2020

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
727621SPHSU Core Renewal: Neighbourhoods and Communities Research ProgrammeAnne EllawayMedical Research Council (MRC)MC_UU_12017/10IHW - MRC/CSO SPHU
Chief Scientist Office (CSO)SPHSU10