Maternal Physical Activity During Pregnancy
Bibliographic record
Abstract
PURPOSE: Maternal physical activity during pregnancy influences infant’s birth weight and body composition, but its association with bone health has been poorly evaluated. This study aims at documenting in a longitudinal study the effect of objectively measured physical activity during pregnancy on infant’s bone mineral content (BMC) and density (BMD). METHODS: 7-day accelerometry recordings (Actigraph GT3X+) were performed in low-risk pregnant women at 17 and 36 weeks of gestation. BMC and BMD were evaluated by DXA in mothers and infants within 2 weeks after birth. Sociodemographics, maternal lifestyle habits, pre-pregnancy physical activity, medical history and pregnancy outcomes were collected through interview and charts’ review. Mean counts per minute (CPM) and daily time spent at moderate and vigorous physical activity (MVPA) were calculated for each period from accelerometry data. The association between physical activity data and infant’s BMC and BMD was evaluated through multiple regression models, adjusting for infant sex and length, parity, maternal pre-pregnancy BMI, gestational weight gain, multivitamin use, gestational age at delivery, infant’s age at DXA, maternal BMD and pre-pregnancy physical activity. RESULTS: : For this preliminary analysis, DXA assessment and accelerometry data for at least one visit were available for 108 pregnant women (age=29.7 ± 3.7 y; pre-pregnancy BMI=23.6 ± 4.7 kg/m2; 59.3% nulliparous) and their baby (birth weight=3451 ± 424 g; gestational age=39.7 ± 1.2 weeks; 45.4% boys). Daily time spent at MVPA at 17 weeks was negatively associated with infant’s BMC and BMD (β= -0.45 g and -0.0009 g/cm3 per 10 min of MVPA, p=0.033 and 0.026), after adjustment for confounders. Similarly, mean CPM at 17 weeks was significantly associated with infant’s BMC and BMD (β= -1.92 g and -0.004 g/cm3 per 100 CPM, p=0.010 and p=0.004). Mean CPM at 36 weeks was also associated with child’s BMC (β= -0.004 g/cm3 per 100 CPM, p=0.024). CONCLUSIONS: Higher levels of maternal physical activity measured by accelerometry during pregnancy were associated with a decrease in infant’s BMC and BMD. The impact of maternal nutrition on this association remains to be investigated. Supported by the Fondation des Étoiles, Canadian Institutes of Health Research and Fonds de Recherche du Québec-Santé.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".