The effect of physical activity during pregnancy on preterm delivery and birth weight (original) (raw)

The relationship between physical activity during pregnancy, preterm birth, and gestational age-adjusted birth weight was investigated prospectively in a cohort of 7101 women. This study is one of few to evaluate both employment-and non-employment-related physical activity. Prolonged periods of standing were associated with a modestly increased risk of preterm delivery (adjusted odds ratio for 2:8 hours/day of standing == 1.31). Heavy work or exercise was not associated with preterm delivery (adjusted odds ratio for 2:4 hours per day of heavy work == 1.04). The proportion of infants born preterm did not differ among women working in predominantly standing, active, and sedentary occupations. Physical activity was not associated with gestational age-adjusted birth weight after controlling for confounding variables. These data suggest that unmeasured socioeconomic differences among women reporting different levels of activity may account for previously described associations between physical activity and pregnancy butcome. Most pregnant women who report increased levels of physical activity are not at increased risk of preterm delivery or reduced intrauterine growth. However, these data do not address the role of activity restriction in the management of selected women at high risk for adverse pregnancy outcome. (AM J The effect of physical activity during pregnancy on preterm delivery and fetal growth has been controversial. Mamelle et al. I stated that as the number of fatigue factors among women employed during pregnancy increased from 0 to 5, the rate of premature birth increased from 2.3% to 11.1%. Among hospital workers, work-related factors (long periods of standing, carrying heavy loads, and performing heavy cleaning tasks) were observed to be associated with preterm delivery! Compared with women whose occupations entailed varied amounts of physical activity, women employed in occupations requiring long periods of standing were found to be 2.7 times as likely to be delivered before