An Activity Index for Raw Accelerometry Data and Its Comparison with Other Activity Metrics
Publication Date
August 11, 2016
Journal
PLOS ONE
Authors
Jiawei Bai, Chongzhi Di, Luo Xiao, Kelly R. Evenson, et al
Volume
11
Issue
8
Pages
e0160644
DOI
https://dx.plos.org/10.1371/journal.pone.0160644
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0160644
Scopus
84983508964
Mendeley
http://www.mendeley.com/research/activity-index-raw-accelerometry-data-comparison-other-activity-metrics
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Mendeley | Further Information

{"title"=>"An activity index for raw accelerometry data and its comparison with other activity metrics", "type"=>"journal", "authors"=>[{"first_name"=>"Jiawei", "last_name"=>"Bai", "scopus_author_id"=>"55631494200"}, {"first_name"=>"Chongzhi", "last_name"=>"Di", "scopus_author_id"=>"29367447300"}, {"first_name"=>"Luo", "last_name"=>"Xiao", "scopus_author_id"=>"55581681200"}, {"first_name"=>"Kelly R.", "last_name"=>"Evenson", "scopus_author_id"=>"7006414128"}, {"first_name"=>"Andrea Z.", "last_name"=>"LaCroix", "scopus_author_id"=>"26643429600"}, {"first_name"=>"Ciprian M.", "last_name"=>"Crainiceanu", "scopus_author_id"=>"6603085071"}, {"first_name"=>"David M.", "last_name"=>"Buchner", "scopus_author_id"=>"7005822858"}], "year"=>2016, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-84983508964", "sgr"=>"84983508964", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0160644", "pmid"=>"27513333", "pui"=>"611775313"}, "id"=>"dc4ab72b-ce6a-3d67-ae8d-97da39ebb6eb", "abstract"=>"Accelerometers have been widely deployed in public health studies in recent years. While they collect high-resolution acceleration signals (e.g., 10-100 Hz), research has mainly focused on summarized metrics provided by accelerometers manufactures, such as the activity count (AC) by ActiGraph or Actical. Such measures do not have a publicly available formula, lack a straightforward interpretation, and can vary by software implementation or hardware type. To address these problems, we propose the physical activity index (AI), a new metric for summarizing raw tri-axial accelerometry data. We compared this metric with the AC and another recently proposed metric for raw data, Euclidean Norm Minus One (ENMO), against energy expenditure. The comparison was conducted using data from the Objective Physical Activity and Cardiovascular Health Study, in which 194 women 60-91 years performed 9 lifestyle activities in the laboratory, wearing a tri-axial accelerometer (ActiGraph GT3X+) on the hip set to 30 Hz and an Oxycon portable calorimeter, to record both tri-axial acceleration time series (converted into AI, AC, and ENMO) and oxygen uptake during each activity (converted into metabolic equivalents (METs)) at the same time. Receiver operating characteristic analyses indicated that both AI and ENMO were more sensitive to moderate and vigorous physical activities than AC, while AI was more sensitive to sedentary and light activities than ENMO. AI had the highest coefficients of determination for METs (0.72) and was a better classifier of physical activity intensity than both AC (for all intensity levels) and ENMO (for sedentary and light intensity). The proposed AI provides a novel and transparent way to summarize densely sampled raw accelerometry data, and may serve as an alternative to AC. The AI's largely improved sensitivity on sedentary and light activities over AC and ENMO further demonstrate its advantage in studies with older adults.", "link"=>"http://www.mendeley.com/research/activity-index-raw-accelerometry-data-comparison-other-activity-metrics", "reader_count"=>50, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Student > Doctoral Student"=>2, "Researcher"=>9, "Student > Ph. D. Student"=>20, "Student > Postgraduate"=>2, "Student > Master"=>7, "Other"=>1, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Student > Doctoral Student"=>2, "Researcher"=>9, "Student > Ph. D. Student"=>20, "Student > Postgraduate"=>2, "Student > Master"=>7, "Other"=>1, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>5, "Agricultural and Biological Sciences"=>4, "Arts and Humanities"=>1, "Computer Science"=>4, "Economics, Econometrics and Finance"=>1, "Engineering"=>7, "Nursing and Health Professions"=>1, "Materials Science"=>1, "Mathematics"=>3, "Medicine and Dentistry"=>7, "Neuroscience"=>2, "Sports and Recreations"=>11, "Psychology"=>2, "Social Sciences"=>1}, "reader_count_by_subdiscipline"=>{"Materials Science"=>{"Materials Science"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>7}, "Social Sciences"=>{"Social Sciences"=>1}, "Sports and Recreations"=>{"Sports and Recreations"=>11}, "Psychology"=>{"Psychology"=>2}, "Mathematics"=>{"Mathematics"=>3}, "Unspecified"=>{"Unspecified"=>5}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Engineering"=>{"Engineering"=>7}, "Neuroscience"=>{"Neuroscience"=>2}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>4}, "Computer Science"=>{"Computer Science"=>4}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}}, "reader_count_by_country"=>{"United Kingdom"=>1, "Australia"=>1, "Germany"=>1}, "group_count"=>2}

Scopus | Further Information

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