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Related Experiment Video

Updated: May 10, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Comparison of self-reported versus accelerometer-measured physical activity.

Sindre M Dyrstad1, Bjørge H Hansen, Ingar M Holme

  • 11Department of Education and Sport Science, University of Stavanger, Stavanger, NORWAY; and 2Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, NORWAY.

Medicine and Science in Sports and Exercise
|June 25, 2013
PubMed
Summary

The International Physical Activity Questionnaire (IPAQ) overestimates vigorous physical activity (PA) and underestimates sedentary time compared to accelerometer data. These discrepancies in PA assessment varied by sex, age, and education level.

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Area of Science:

  • Epidemiology
  • Public Health
  • Biomedical Measurement

Background:

  • The International Physical Activity Questionnaire (IPAQ) is a widely used tool for assessing physical activity (PA).
  • Existing validation studies highlight a need for large-scale comparisons between IPAQ and objective measures like accelerometers.

Purpose of the Study:

  • To compare self-reported PA and sedentary time using the IPAQ-Short Form against accelerometer data in a large national sample.
  • To investigate how sex, age, and education influence discrepancies between self-reported and measured physical activity.

Main Methods:

  • 1751 adults (19-84 years) wore an ActiGraph accelerometer for seven days and completed the IPAQ-Short Form.
  • Data on sedentary time, total PA, and moderate-to-vigorous PA (MVPA) were analyzed.

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Last Updated: May 10, 2026

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  • Comparisons were made in relation to sex, age, and education level.

    • Main Results:

    • Participants reported 131 min/day less sedentary time than measured by accelerometer.
    • Differences in sedentary time and vigorous PA were most pronounced in older men and those with lower education.
    • Men reported 47% more MVPA than women, but accelerometer data showed no sex difference in MVPA.

    Conclusions:

    • The IPAQ-Short Form overestimates vigorous PA and underestimates sedentary time compared to accelerometer measurements.
    • Discrepancies between self-reported and measured MVPA increase with higher activity and intensity levels.
    • The agreement between IPAQ and accelerometer data is influenced by sex, age, and education, but not BMI.