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dc.contributor.authorHallal, Pedro C.
dc.contributor.authorReichert, Felipe F.
dc.contributor.authorClark, Valerie L.
dc.contributor.authorCordeira, Kelly L.
dc.contributor.authorMenezes, Ana M. B.
dc.contributor.authorEaton, Simon
dc.contributor.authorEkelund, Ulf
dc.contributor.authorWells, Jonathan C.
dc.date.accessioned2014-03-06T14:11:50Z
dc.date.available2014-03-06T14:11:50Z
dc.date.issued2013-11-04
dc.identifier.citationPLoS ONE. 2013, 8, e77036nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/191311
dc.description© 2013 Hallal et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.nb_NO
dc.description.abstractBackground: Physical inactivity is responsible for 5.3 million deaths annually worldwide. To measure physical activity energy expenditure, the doubly labeled water (DLW) method is the gold standard. However, questionnaires and accelerometry are more widely used. We compared physical activity measured by accelerometer and questionnaire against total (TEE) and physical activity energy expenditure (PAEE) estimated by DLW. Methods: TEE, PAEE (TEE minus resting energy expenditure) and body composition were measured using the DLW technique in 25 adolescents (16 girls) aged 13 years living in Pelotas, Brazil. Physical activity was assessed using the Actigraph accelerometer and by self-report. Physical activity data from accelerometry and self-report were tested against energy expenditure data derived from the DLW method. Further, tests were done to assess the ability of moderate-to-vigorous intensity physical activity (MVPA) to predict variability in TEE and to what extent adjustment for fat and fat-free mass predicted the variability in TEE. Results: TEE varied from 1,265 to 4,143 kcal/day. It was positively correlated with physical activity (counts) estimated by accelerometry (rho = 0.57; p = 0.003) and with minutes per week of physical activity by questionnaire (rho = 0.41; p = 0.04). An increase of 10 minutes per day in moderate-to-vigorous intensity physical activity (MVPA) relates to an increase in TEE of 141 kcal/day. PAEE was positively correlated with accelerometry (rho = 0.64; p = 0.007), but not with minutes per week of physical activity estimated by questionnaire (rho = 0.30; p = 0.15). Physical activity by accelerometry explained 31% of the vssariability in TEE. By incorporating fat and fat-free mass in the model, we were able to explain 58% of the variability in TEE. Conclusion: Objectively measured physical activity significantly contributes to the explained variance in both TEE and PAEE in Brazilian youth. Independently, body composition also explains variance in TEE, and should ideally be taken into account when using accelerometry to predict energy expenditure values.nb_NO
dc.language.isoengnb_NO
dc.publisherPLOS.orgnb_NO
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470nb_NO
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Landbruksfag: 910nb_NO
dc.subjectaccelerometersnb_NO
dc.subjectadolescentsnb_NO
dc.subjectbioenergeticsnb_NO
dc.subjectcarbon dioxidenb_NO
dc.subjectchildrennb_NO
dc.subjectcohort studiesnb_NO
dc.subjectisotopesnb_NO
dc.subjectschoolsnb_NO
dc.titleEnergy expenditure compared to physical activity measured by accelerometry and self-report in adolescents: A validation studynb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalPLoS ONEnb_NO
dc.identifier.doi10.1371/journal.pone.0077036
dc.description.localcodeSeksjon for idrettsmedisinske fag / Department of Sport Sciencesnb_NO


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