Related Experiment Video
Updated: Mar 19, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
Published on: March 7, 2019
Comment on "Should we reframe how we think about physical activity and sedentary behavior measurement? Validity and
Caroline B Terwee1, L B Mokkink2, L M Hidding3
1Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Center, F-building MedFac, P.O. box 7057, 1007 MB, Amsterdam, The Netherlands. cb.terwee@vumc.nl.
Abstract:
With great interest we read the article by Kelly et al. on the measurement of physical activity (PA) and sedentary behavior (SB) (Kelly P et al. Int J Behav Nutr Phys Act 13:(1) 32, 2016). We appreciate the invitation of the authors to provide feedback on their ideas and we take this opportunity to contribute to the discussion. Our main proposition is that this field can learn much from the field of quality of life research and the methodology developed for validating quality of life questionnaires.

