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News

Pool chemicals do not damage growth of the unborn child

University Of Bristol : 12 November, 2003  (Technical Article)
Women who swim regularly during pregnancy do not run the risk of reduced birth weight, according to a study published today in the journal Epidemiology. There has been concern of late that certain substances in swimming pools, so-called chlorination by-products (trihalomethanes), have been linked with adverse birth outcomes by other studies.
Women who swim regularly during pregnancy do not run the risk of reduced birth weight, according to a study published today in the journal Epidemiology. There has been concern of late that certain substances in swimming pools, so-called chlorination by-products (trihalomethanes), have been linked with adverse birth outcomes by other studies.

But researchers from Imperial College, London and Bristol University investigating more than eleven thousand pregnant women in the ALSPAC study, which is based at Bristol University, found that the amount of swimming a woman did whilst pregnant did not significantly affect the birth weight of her child.

The information came from 11,462 women in the study, which is known popularly as Children of the 90s. The study has monitored the health, well being and development of over 14,000 families since the early 90s.

The study found that 59 per cent of women never swam during their pregnancy, 31 per cent swam up to one hour per week, while 10 per cent swam for longer. Women who did swim were more likely to be higher educated and to be non-smokers.

There is no empirical evidence that trihalomethanes in swimming pools have a detrimental effect on the health of swimming pool users. And based on the available evidence, there is minimal, if any risk to pregnant women and the benefits largely outweigh the risks. We need disinfection to get rid of dangerous pathogens in the water and swimming as an exercise is beneficial to pregnant women and should be encouraged and enjoyed.
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