J. Med. Internet Res. - Estimation of physical activity levels using cell phone questionnaires: a comparison with accelerometry for evaluation of between-subject and within-subject variations.

Tópicos

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Resumo

CKGROUND: 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.OBJECTIVE: 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.METHODS: 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? to 33.6 kg/m?). The results were evaluated by fitting linear mixed effect models and descriptive statistics and graphs.RESULTS: 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.CONCLUSIONS: 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.

Resumo Limpo

ckground physic activ promot health longev elabor role physic activ human health epidemiolog studi larg sampl requir accur method easi use cheap possibl repeat use telecommun technolog cell phone high interest respect earlier report show physic activ level pal assess use cell phone procedur agre well correspond estim obtain use doubli label water method howev earlier studi indic high withinsubject variat relat betweensubject variat pal use cell phone assess true variat pal artifact cell phone techniqueobject object compar within betweensubject variat pal mean cell phone correspond estim use acceleromet addit compar agreement daili pal valu obtain use cell phone questionnair correspond data obtain use accelerometermethod pal measur cell phone questionnair triaxial acceleromet daili week studi period healthi swedish women year age bmi kgm kgm result evalu fit linear mix effect model descript statist graphsresult acceleromet confid interv ci variat within subject cell phone withinsubject variat ci daytoday variat pal observ use cell phone question agre well correspond acceleromet resultsconclus cell phone questionnair acceleromet show high withinsubject variat furthermor daytoday variat pal within subject assess use cell phone agre well correspond acceleromet valu consequ cell phone questionnair promis tool assess level physic activ tool may use largescal prospect studi

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