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dc.contributor.authorda Silva, Shana Ginar
dc.contributor.authorEvenson, Kelly R.
dc.contributor.authorEkelund, Ulf
dc.contributor.authorda Silva, Inácio Crochemore Mohnsam
dc.contributor.authorDomingues, Marlos Rodrigues
dc.contributor.authorda Silva, Bruna Gonçalves Cordeiro
dc.contributor.authorMendes, Márcio de Almeida
dc.contributor.authorCruz, Gloria Isabel Niño
dc.contributor.authorHallal, Pedro Curi
dc.date.accessioned2020-05-15T09:08:57Z
dc.date.available2020-05-15T09:08:57Z
dc.date.created2020-02-03T15:13:27Z
dc.date.issued2019
dc.identifier.citationPLoS ONE. 2019, 14(6), e0211442.en_US
dc.identifier.issn1932-6203
dc.identifier.urihttps://hdl.handle.net/11250/2654603
dc.descriptionThis is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en_US
dc.description.abstractBackground: Objective methods to measure physical activity (PA) can lead to better cross-cultural comparisons, monitoring temporal PA trends, and measuring the effect of interventions. However, when applying this technology in field-work, the accelerometer data processing is prone to methodological issues. One of the most challenging issues relates to standardizing total wear time to provide reliable data across participants. It is generally accepted that at least 4 complete days of accelerometer wear represent a week for adults. It is not known if this same assumption holds true for pregnant women. Aim: We assessed the optimal number of days needed to obtain reliable estimates of overall PA and moderate-to-vigorous physical activity (MVPA) during the 2nd trimester in pregnancy using a raw triaxial wrist-worn accelerometer. Methods: Cross-sectional analyses were carried out in the antenatal wave of the 2015 Pelotas (Brazil) Birth Cohort Study. Participants wore the wrist ActiGraph wGT3X-BT accelerometer for seven consecutive days. The daily average acceleration, which indicated overall PA, was measured as milli-g (mg), and time spent in MVPA (minutes/day) was analyzed in 5-minute bouts. ANOVA and Kruskal-Wallis tests were used to compare variability across days of the week. Bland-Altman plots and the Spearman-Brown Prophecy Formula were applied to determine the reliability coefficient associated with one to seven days of measurement. Results: Among 2,082 pregnant women who wore the accelerometer for seven complete days, overall and MVPA were lower on Sundays compared to other days of the week. Reliability of > = 0.80 to evaluate overall PA was reached with at least three monitoring days, whereas seven days were needed to estimate reliable measures of MVPA. Conclusions: Our findings indicate that obtaining one week of accelerometry in adults is appropriate for pregnant women, particularly to obtain differences on weekend days and reliably estimate overall PA and MVPA.en_US
dc.language.isoengen_US
dc.subjectpregnancyen_US
dc.subjectaccelerometersen_US
dc.subjectexerciseen_US
dc.subjectphysical activityen_US
dc.subjectsosioeconomic aspects of healthen_US
dc.subjectcohort studiesen_US
dc.subjectwristen_US
dc.subjectdata processingen_US
dc.titleHow many days are needed to estimate wrist-worn accelerometry-assessed physical activity during the second trimester in pregnancy?en_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© 2019 da Silva et al.en_US
dc.source.pagenumber12en_US
dc.source.volume14en_US
dc.source.journalPLoS ONEen_US
dc.source.issue6en_US
dc.identifier.doi10.1371/journal.pone.0211442
dc.identifier.cristin1790341
dc.description.localcodeSeksjon for idrettsmedisinske fag / Department of Sports Medicineen_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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