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Exercise in pregnancy
Title: Beginning regular exercise in early pregnancy: Effect on fetoplacental growth
Author: J. Clapp, et al.
Address: Cleveland, Ohio
Source: American Jouranl of Obstetrics and Gynecology (December) 2000
Summary: The objective of this study was to test the null hypothesis that
beginning regular, moderate-intensity exercise in early pregnancy has no effect
on fetoplacental growth. The study patients consisted of 46 women who did not
exercise regularly. They were randomly assigned at 8 weeks gestation to either a
no exercise group (n=24) or to a weight-bearing exercise group (n=22). The women
assigned to the exercise group were to exercise 3 to 5 times a week for the
duration of the pregnancy. The outcome variables included antenatal placental
growth rate and neonatal and placental morphometric measurements. It was learned
that the offspring of the exercising women were significantly heavier (corrected
birth weight: 3.75 ± 0.08 kg vs. 3.49 ± 0.07 kg) and longer (51.8 ± 0.3 cm vs.
50.6 ± 0.3 cm) than those born to the women in the non-exercising group. The
difference in birth weight was the result of an increase in both lean body mass
and fat mass. Additionally, midtrimester placental growth rate was faster (26 ± 2
cm3/wk vs. 21 ± 1 cm3/wk) and morphometric indexes of placental function were
greater in the exercise group. There were no significant differences found in
neonatal percentage body fat, head circumference, ponderal index, or maternal
weight gain. Researchers concluded that these findings indicate that beginning a
moderate regimen of weight-bearing exercise in early pregnancy enhances
fetoplacental growth.
Comment: A similar study has shown that aggressive
exercise in pregancy reduced fetal size, but was not associated with any other
adverse outcome. The golden rule of moderation is still in order.