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Feasibility of Measuring Sedentary Time with Thigh Worn Accelerometry and Sociodemographic Correlates: The 1970 British Cohort Study
21 Pages Posted: 11 Oct 2019
More...Abstract
Background: Sedentary behaviour has been routinely measured using self-report in large scale cohort studies. Here we report on one of the first large scale population cohort studies to employ a gold standard postural allocation technique to capture free-living sedentary behaviour.
Methods: Participants (n=4,634, aged 46.8 ± 0.7 yrs) from the 1970 British Cohort study were fitted with a water-proofed thigh mounted accelerometer device (activPAL3 micro; PAL Technologies Ltd.). Devices were worn continuously over a 7 day period and returned via post. Data were processed using an algorithm to isolate valid waking wear data from sleep or prolonged non-wear.
Findings: Participants that declined to wear the device (11.5%) were more likely to be male, smokers, and report poorer health. Useable data were retrieved in 85.7% of the devices fitted, with 79.6% of the sample recording at least 6 full days of wear (at least 10 waking hours). Total daily sitting time (average 9.5±2.0 hr/d men and 9.0±2.0 hr/d women) accounted for 59.4% and 57.3% of waking hours in men and women respectively; 73.8% of the sample recorded ≥8hr/d of sitting. Sitting in prolonged bouts of more than 60 continuous minutes accounted for 25.3 % and 24.4% of total daily sitting in men and women respectively. In mutually adjusted models, male sex, obesity, education, poor self-rated health, TV-viewing time and a sitting occupation were associated with higher sitting times.
Interpretation: Thigh worn accelerometry can be feasibly deployed in large scale population cohorts and is sociodemographically patterned. Funding: British Heart Foundation (SP/15/6/31397).
Funding Statement: British Heart Foundation (SP/15/6/31397).
Declaration of Interests: MH, SC, NP, MB, EG, AS do not have any competing interests to declare. ES has received an unrestricted grant from PAL Technologies, Scotland, UK.
Ethics Approval Statement: Participants provided informed consent and the study received full ethical approval from NRES Committee South East Coast - Brighton & Sussex (Ref 15/LO/1446).
Keywords: Sedentary; Physical activity; Sitting; Lifestyle; Population Cohort; Wearable
Suggested Citation: Suggested Citation