liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Estimation of Physical Activity Levels Using Cell Phone Questionnaires: A Comparison With Accelerometry for Evaluation of Between-Subject and Within-Subject Variations
Karolinska Institutet.
Karolinska Institutet.
Karolinska Institutet.
Karolinska Institutet.
Show others and affiliations
2011 (English)In: Journal of Medical Internet Research, ISSN 1438-8871, Vol. 13, no 3Article in journal (Refereed) Published
Abstract [en]

Background: Physical activity promotes health and longevity. Further elaboration of the role of physical activity for human health in epidemiological studies on large samples requires accurate methods that are easy to use, cheap, and possible to repeat. The use of telecommunication technologies such as cell phones is highly interesting in this respect. In an earlier report, we showed that physical activity level (PAL) assessed using a cell phone procedure agreed well with corresponding estimates obtained using the doubly labeled water method. However, our earlier study indicated high within-subject variation in relation to between-subject variations in PAL using cell phones, but we could not assess if this was a true variation of PAL or an artifact of the cell phone technique. less thanbrgreater than less thanbrgreater thanObjective: Our objective was to compare within-and between-subject variations in PAL by means of cell phones with corresponding estimates using an accelerometer. In addition, we compared the agreement of daily PAL values obtained using the cell phone questionnaire with corresponding data obtained using an accelerometer. less thanbrgreater than less thanbrgreater thanMethods: PAL was measured both with the cell phone questionnaire and with a triaxial accelerometer daily during a 2-week study period in 21 healthy Swedish women (20 to 45 years of age and BMI from 17.7 kg/m(2) to 33.6 kg/m(2)). The results were evaluated by fitting linear mixed effect models and descriptive statistics and graphs. less thanbrgreater than less thanbrgreater thanResults: With the accelerometer, 57% (95% confidence interval [CI] 40%-66%) of the variation was within subjects, while with the cell phone, within-subject variation was 76% (95% CI 59%-83%). The day-to-day variations in PAL observed using the cell phone questions agreed well with the corresponding accelerometer results. less thanbrgreater than less thanbrgreater thanConclusions: Both the cell phone questionnaire and the accelerometer showed high within-subject variations. Furthermore, day-to-day variations in PAL within subjects assessed using the cell phone agreed well with corresponding accelerometer values. Consequently, our cell phone questionnaire is a promising tool for assessing levels of physical activity. The tool may be useful for large-scale prospective studies.

Place, publisher, year, edition, pages
Journal of Medical Internet Research / Gunther Eysenbach , 2011. Vol. 13, no 3
Keyword [en]
Cell phone, Internet, physical activity, epidemiology
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-72148DOI: 10.2196/jmir.1686ISI: 000296260500014OAI: diva2:457495
Funding Agencies|Swedish Research Council, FORMAS||Magnus Bergvall Foundation||Thuring Foundation||Swedish Society of Medicine||Available from: 2011-11-18 Created: 2011-11-18 Last updated: 2011-11-29

Open Access in DiVA

fulltext(380 kB)272 downloads
File information
File name FULLTEXT01.pdfFile size 380 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Löf, Marie
By organisation
NutritionFaculty of Health Sciences
In the same journal
Journal of Medical Internet Research
Medical and Health Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 272 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 40 hits
ReferencesLink to record
Permanent link

Direct link