University of Leicester
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Using accelerometry to classify physical activity intensity in older adults: What is the optimal wear-site?

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posted on 2020-03-06, 09:31 authored by Michael J Duncan, Alex Rowlands, Chelsey Lawson, Sheila Leddington Wright, Matt Hill, Martyn Morris, Emma Eyre, Jason Tallis
This study aimed to determine the optimal accelerometer wear-site specific cut-points for discrimination of the sedentary time, light physical activity and moderate-to-vigorous physical activity (MVPA) in older adults. Twenty-three adults (14 females) aged 55-77 years wore a GENEActiv accelerometer on their non-dominant wrist, dominant wrist, waist and dominant ankle whilst undertaking eight, five-minute bouts of activity: lay supine, seated reading, slow walking, medium walking, fast walking, folding laundry, sweeping and stationary cycling. VO2 was assessed concurrently using indirect calorimetry. Receiver-operating-characteristic (ROC) analyses were used to derive wear-site specific cut-points for classifying intensity. Indirect calorimetry indicated that being lay supine and seated reading were classified as sedentary (<1.5 METs), laundry as light (1.51-2.99 METs) and sweeping, slow, medium and fast walking and cycling all classified as moderate intensity (>3 METs). Areas under ROC curves indicated that the classification of sedentary activity was good for the non-dominant wrist and excellent for all other wear sites. Classification of MVPA was excellent for the waist and ankle, good for the waist and poor for the dominant and non-dominant wrists. Overall, the ankle location performed better than in other locations. Ankle-worn accelerometry appears to provide the most suitable wear-site to discriminate between sedentary time and MVPA in older adults.



European Journal of Sport Science, 2019, DOI: 10.1080/17461391.2019.1694078

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Diabetes Research Centre, College of Life Sciences


  • AM (Accepted Manuscript)

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European Journal of Sport Science


Taylor & Francis for European College of Sport Science





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