ArticlePloS one2019
How many days are needed to estimate wrist-worn accelerometry-assessed physical activity during the second trimester in pregnancy?
Article in PloS one, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
16 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Physical Activity during Pregnancy and Newborn Body Composition: A Systematic Review.International journal of environmental research and public health · 2022Pooled it
- Objective Smartphone Screen Time Monitoring Among Caregivers of Preschool-Aged Children: Reliability Study of Monitoring Duration.JMIR mHealth and uHealth · 2026Article
- Association between objectively measured physical activity and maternal stool microbiota during pregnancy: results from a preliminary investigation.Frontiers in cellular and infection microbiology · 2026Article
- Device-measured and self-reported physical activity during the first two years postpartum in women with recent gestational diabetes: evidence from the LINDA-Brasil study.Archives of endocrinology and metabolism · 2025Article
- Healthy Mom Zone Adaptive Intervention With a Novel Control System and Digital Platform to Manage Gestational Weight Gain in Pregnant Women With Overweight or Obesity: Study Design and Protocol for a Randomized Controlled Trial.JMIR research protocols · 2025Article
- Lessons from 13 years of accelerometry measurements in five Brazilian cohorts: methodological aspects.Cadernos de saude publica · 2025Article
- Physical Activity Fragmentation and Falls in Older Adults: Findings From the National Health and Aging Trends Study.The journals of gerontology. Series A, Biological sciences and medical sciences · 2024Article
- A feasibility study using motivational interviewing and a smartphone application to promote physical activity (+Stay-Active) for women with gestational diabetes.BMC pregnancy and childbirth · 2024Article
- Regularity of bedtime, wake-up time, and time in bed in mid-life: associations with cardiometabolic health markers with adjustment for physical activity and sedentary time.Journal of activity, sedentary and sleep behaviors · 2024Article
- The prospective associations of 24-hour movement behaviors and domain-specific activities with executive function and academic achievement among school-aged children in Singapore.Frontiers in public health · 2024Observational
- Physical Activity, Sedentary and Sleep Phenotypes in Women During the First Trimester of Pregnancy.Maternal and child health journal · 2023Article
- Study protocol: use of a smartphone application to support the implementation of a complex physical activity intervention (+BMJ open · 2022Article
- Does Prenatal Physical Activity Affect the Occurrence of Postnatal Anxiety and Depression? Longitudinal Study.International journal of environmental research and public health · 2022Article
- Assessment of Physical Activity in Adults Using Wrist Accelerometers.Epidemiologic reviews · 2022Review
- Antenatal Determinants of Childhood Obesity in High-Risk Offspring: Protocol for the DiGest Follow-Up Study.Nutrients · 2021Article
- Association between device-measured physical activity and lumbar Modic changes.BMC musculoskeletal disorders · 2020Article
Corrections and comments
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Authors and funding
9 authors.
Funding
Abstract
backgroundObjective 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.
aimWe 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.
methodsCross-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.
resultsAmong 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.
conclusionsOur 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.
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