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The effects of vigorous exercise during pregnancy on birth weight
Bell R
Journal of Science and Medicine in Sport 2002 Mar;5(1):32-36
clinical trial
4/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

Whether or not vigorous exercise during pregnancy affects birth weight is an important issue because birth weight is the single most important determinant of neonatal mortality. A current meta-analysis of randomised trials of exercise during pregnancy did not find, although also did not exclude, a clinically important effect of exercise on birth weight. Randomised trials may miss the women exercising at the most elite levels during pregnancy. We should remain open-minded on this issue until sufficient evidence is available on which to base recommendations.

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