Journal article
Comparison of Two Generations of ActiGraph Accelerometers: The CARDIA Study
Medicine and science in sports and exercise, Vol.50(6), pp.1333-1340
06/2018
DOI: 10.1249/MSS.0000000000001568
PMCID: PMC5953790
PMID: 29381652
Abstract
This study aimed to examine the comparability of the ActiGraph 7164 and wGT3X-BT wear time, count-based estimates, and average time per day in physical activity of different intensities.
We studied 87 Coronary Artery Risk Development in Young Adults (CARDIA) participants 48-60 yr of age who simultaneously wore the 7164 and wGT3X-BT accelerometers at the waist in 2015-2016, with wear time of ≥4 of 7 d, ≥10 h·d for both monitors. Freedson cutpoints (counts per minute) were used to define sedentary (<100), light (100-1951), moderate (1952-5724), and vigorous activity (≥5725). Agreement was evaluated using paired-difference tests, intraclass correlation coefficients, and Bland-Altman plots. Given systematic differences in count-based estimates between monitors, a calibration formula applied to the wGT3X-BT values was obtained by linear regression.
Total detected wear time minutes per day was nearly identical between the 7164 and the wGT3X-BT (881.5 ± 70.9 vs 880.3 ± 78.1, P = 0.72). The wGT3X-BT values were calibrated to the 7164 values by dividing counts by 1.088. After calibration, no differences were observed between the 7164 and the wGT3X-BT in total counts per day (310,184 ± 129,189 vs 307,085 ± 135,362, P = 0.48), average counts per min per day (349.5 ± 139.5 vs 346.5 ± 147.2, P = 0.54), sedentary (513.2 ± 93.6 vs 509.6 ± 98.6, P = 0.23), light (335.3 ± 81.5 vs 338.7 ± 81.1, P = 0.22), moderate (31.0 ± 21.9 vs 30.3 ± 23.4, P = 0.31), or moderate-to-vigorous minutes per day (33.1 ± 24.6 vs 32.0 ± 26.0, P = 0.13). A significant difference was observed for vigorous minutes per day (0.2 ± 1.0 vs 0.0 ± 0.3, P < 0.01); however, the absolute difference was marginal. Intraclass correlation coefficients showed excellent agreement for all measures (0.95-0.99).
After applying a calibration formula, the 7164 and wGT3X-BT were comparable for total wear time, count-based estimates, and average minutes per day in sedentary, light, moderate, and moderate-to-vigorous activity. Findings illustrate a novel methodological approach to facilitate accelerometer data harmonization.
Details
- Title: Subtitle
- Comparison of Two Generations of ActiGraph Accelerometers: The CARDIA Study
- Creators
- Kara M Whitaker - Division of Health and Human Physiology, College of Liberal Arts and Sciences, University of Iowa, Iowa City, IAKelley Pettee Gabriel - Department of Epidemiology, Human Genetics, and Environmental Sciences, School of Public Health-Austin Campus, University of Texas Health Science Center at Houston, Austin, TX Department of Women's Health, Dell Medical School, University of Texas at Austin, Austin, TXDavid R Jacobs Jr - Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MNStephen Sidney - Division of Research, Kaiser Permanente, Oakland, CABarbara Sternfeld - Division of Research, Kaiser Permanente, Oakland, CA
- Resource Type
- Journal article
- Publication Details
- Medicine and science in sports and exercise, Vol.50(6), pp.1333-1340
- DOI
- 10.1249/MSS.0000000000001568
- PMID
- 29381652
- PMCID
- PMC5953790
- NLM abbreviation
- Med Sci Sports Exerc
- ISSN
- 0195-9131
- eISSN
- 1530-0315
- Publisher
- United States
- Grant note
- HHSN268201300026C / NHLBI NIH HHS HHSN268201300027C / NHLBI NIH HHS R01 HL078972 / NHLBI NIH HHS HHSN268201300025C / NHLBI NIH HHS HHSN268200900041C / NHLBI NIH HHS R56 HL125423 / NHLBI NIH HHS HHSN268201300029C / NHLBI NIH HHS HHSN268201300028C / NHLBI NIH HHS T32 HL007779 / NHLBI NIH HHS
- Language
- English
- Date published
- 06/2018
- Academic Unit
- Epidemiology; Health, Sport, and Human Physiology
- Record Identifier
- 9984002475602771
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