Nieuwenhuijsen Mark J, Northstone Kate, Golding Jean
Department of Environmental Sciences and Technology, Imperial College of Science, Technology and Medicine, Royal School of Mines, London, UK.
Epidemiology. 2002 Nov;13(6):725-8. doi: 10.1097/00001648-200211000-00020.
Swimmers can be exposed to high levels of trihalomethanes, byproducts of chlorination disinfection. There are no published studies on the relation between swimming and birth weight. We explored this relation in a large birth cohort, the Avon (England) Longitudinal Study of Parents and Children (ALSPAC), in 1991-1992.
Information on the amount of swimming per week during the first 18-20 weeks of pregnancy was available for 11,462 pregnant women. Fifty-nine percent never swam, 31% swam up to 1 hour per week, and 10% swam for longer. We used linear regression to explore the relation between birth weight and the amount of swimming, with adjustment for gestational age, maternal age, parity, maternal education level, ethnicity, housing tenure, drug use, smoking and alcohol consumption.
We found little effect of the amount of swimming on birth weight. More highly educated women were more likely to swim compared with less educated women, whereas smokers were less likely to swim compared with nonsmokers.
There appears to be no relation between the duration of swimming and birth weight.
游泳者可能会接触到高水平的三卤甲烷，这是氯化消毒的副产物。目前尚无关于游泳与出生体重之间关系的已发表研究。我们于1991 - 1992年在一个大型出生队列——雅芳（英格兰）父母与儿童纵向研究（ALSPAC）中探讨了这种关系。
11462名孕妇提供了孕期前18 - 20周每周游泳量的信息。59%的孕妇从不游泳，31%的孕妇每周游泳时间达1小时，10%的孕妇游泳时间更长。我们使用线性回归来探讨出生体重与游泳量之间的关系，并对孕周、产妇年龄、产次、产妇教育水平、种族、住房保有情况、药物使用、吸烟和饮酒情况进行了调整。
我们发现游泳量对出生体重影响不大。与受教育程度较低的女性相比，受教育程度较高的女性更有可能游泳；与不吸烟者相比，吸烟者游泳的可能性较小。
游泳时长与出生体重之间似乎没有关系。
