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IDEEA activity monitor: validity of activity recognition for lying, reclining, sitting and standing

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Abstract

Recent evidence demonstrates the independent negative effects of sedentary behavior on health, but there are few objective measures of sedentary behavior. Most instruments measure physical activity and are not validated as measures of sedentary behavior. The purpose of this study was to evaluate the validity of the IDEEA system’s measures of sedentary and low-intensity physical activities: lying, reclining, sitting and standing. Thirty subjects, 14 men and 16 women, aged 23 to 77 years, body mass index (BMI) between 18 to 34 kg/m2, participated in the study. IDEEA measures were compared to direct observation for 27 activities: 10 lying in bed, 3 lying on a sofa, 1 reclining in a lawn chair, 10 sitting and 3 standing. Two measures are reported, the percentage of activities accurately identified and the percentage of monitored time that was accurately labeled by the IDEEA system for all subjects. A total of 91.6% of all observed activities were accurately identified and 92.4% of the total monitored time was accurately labeled. The IDEEA system did not accurately differentiate between lying and reclining so the two activities were combined for calculating accuracy. Using this approach the IDEEA system accurately identified 96% of sitting activities for a total of 97% of the monitored sitting time, 99% and 99% for standing, 87% and 88% for lying in bed, 87% and 88% for lying on the sofa, and 83% and 83% for reclining on a lawn chair. We conclude that the IDEEA system accurately recognizes sitting and standing positions, but it is less accurate in identifying lying and reclining positions. We recommend combining the lying and reclining activities to improve accuracy. The IDEEA system enables researchers to monitor lying, reclining, sitting and standing with a reasonable level of accuracy and has the potential to advance the science of sedentary behaviors and low-intensity physical activities.

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Authors and Affiliations

  1. Division of Acute, Critical and Long Term Care Programs, University of Michigan, Ann Arbor, MI, 48109, USA

    Yuyu Jiang & Janet L. Larson

  2. Division of Medicine, Wuxi Medical School, Jiangnan University, Wuxi, 214122, China

    Yuyu Jiang

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  1. Yuyu Jiang
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  2. Janet L. Larson
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Correspondence to Yuyu Jiang.

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Jiang, Y., Larson, J.L. IDEEA activity monitor: validity of activity recognition for lying, reclining, sitting and standing. Front. Med. 7, 126–131 (2013). https://doi.org/10.1007/s11684-012-0236-0

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  • DOI: https://doi.org/10.1007/s11684-012-0236-0

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