Physical exercise during pregnancy and fetal growth measures: a study within the Danish National Birth Cohort.
OBJECTIVE
The objective of the study was to examine the association between physical exercise during pregnancy and fetal growth measures.


METHODS
Data on 79,692 liveborn singletons from the Danish National Birth Cohort were collected between 1996 and 2002. Mean differences in birthweight, length, ponderal index, head and abdominal circumference, and placental weight and hazard ratios of small- and large-for-gestational-age babies were calculated.


RESULTS
Our data indicated smaller babies in exercising women compared with nonexercisers, but the differences were small, and only a few were statistically significant. Exercising women had a slightly decreased risk of having a child small for gestational age (hazard ratio, 0.87; 95% confidence interval, 0.83-0.92) and large for gestational age (hazard ratio, 0.93; 95% confidence interval, 0.89-0.98).


CONCLUSIONS
The findings do not indicate sizable effects on fetal growth measures related to exercise apart from a modest decreased risk of small- and large-for-gestational-age infants. These findings do not speak against advising pregnant women to be physically active during pregnancy.
Juhl
Mette
M
National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark. metjuhl@gmail.com
Olsen
Jørn
J
Andersen
Per Kragh
PK
Nøhr
Ellen Aagaard
EA
Andersen
Anne-Marie Nybo
AM
D000328:Adult; D001724:Birth Weight / Q000502:physiology; D001827:Body Height / Q000502:physiology; D003718:Denmark / Q000453:epidemiology; D015444:Exercise / Q000502:physiology*; D005260:Female; D005333:Fetus / Q000502:physiology*; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age / Q000502:physiology*; D009929:Organ Size; D010920:Placenta / Q000502:physiology; D011247:Pregnancy; D011256:Pregnancy Outcome