Journal article
Calibration of the global physical activity questionnaire to Accelerometry measured physical activity and sedentary behavior
BMC Public Health, Vol.18(1), 412
03/27/2018
DOI: 10.1186/s12889-018-5310-3
PMCID: PMC5870179
PMID: 29587694
Abstract
Background
Self-report questionnaires are a valuable method of physical activity measurement in public health research; however, accuracy is often lacking. The purpose of this study is to improve the validity of the Global Physical Activity Questionnaire by calibrating it to 7 days of accelerometer measured physical activity and sedentary behavior.
Methods
Participants (n = 108) wore an ActiGraph GT9X Link on their non-dominant wrist for 7 days. Following the accelerometer wear period, participants completed a telephone Global Physical Activity Questionnaire with a research assistant. Data were split into training and testing samples, and multivariable linear regression models built using functions of the GPAQ self-report data to predict ActiGraph measured physical activity and sedentary behavior. Models were evaluated with the testing sample and an independent validation sample (n = 120) using Mean Squared Prediction Errors.
Results
The prediction models utilized sedentary behavior, and moderate- and vigorous-intensity physical activity self-reported scores from the questionnaire, and participant age. Transformations of each variable, as well as break point analysis were considered. Prediction errors were reduced by 77.7–80.6% for sedentary behavior and 61.3–98.6% for physical activity by using the multivariable linear regression models over raw questionnaire scores.
Conclusions
This research demonstrates the utility of calibrating self-report questionnaire data to objective measures to improve estimates of physical activity and sedentary behavior. It provides an understanding of the divide between objective and subjective measures, and provides a means to utilize the two methods as a unified measure.
Details
- Title: Subtitle
- Calibration of the global physical activity questionnaire to Accelerometry measured physical activity and sedentary behavior
- Creators
- Kristen M. Metcalf - University of IowaBarbara I. Baquero - University of Iowa, Community and Behavioral HealthMayra L. Coronado Garcia - University of IowaShelby L. Francis - University of IowaKathleen F. Janz - University of Iowa, EpidemiologyHelena H. Laroche - University of Iowa, Internal MedicineDaniel K. Sewell - University of Iowa, Biostatistics
- Resource Type
- Journal article
- Publication Details
- BMC Public Health, Vol.18(1), 412
- DOI
- 10.1186/s12889-018-5310-3
- PMID
- 29587694
- PMCID
- PMC5870179
- NLM abbreviation
- BMC Public Health
- ISSN
- 1471-2458
- eISSN
- 1471-2458
- Publisher
- BMC
- Copyright
- © 2018, Springer Nature
- Grant note
- This work was funded by the Centers for Disease Control and Prevention Cooperative Agreement Number 1 U48 DP005021–01, and the National Institutes of Health through grant 5R01 HL119882. The funding agencies were not involved in the study design, collection, analysis and interpretation of data, or in writing the manuscript. Competing Interests: The authors declare that they have no competing interests.
- Language
- English
- Date published
- 03/27/2018
- Academic Unit
- College of Liberal Arts and Sciences; Health, Sport, and Human Physiology
- Record Identifier
- 9983761184702771
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