Research directly related DBPs used in swimming pools (DBPs) with the mutagenicity - the ability to cause permanent mutations in the DNA - and compared the effects in a chlorinated pool and another with bromine.

The study, conducted by researchers at the Center for Research in Environmental Epidemiology (Creal) and the Research Institute of Hospital del Mar de Barcelona (IMIM), explicitly stresses that swimming has positive impacts on health, which would be even greater if reduce levels of chemicals used in disinfection.

Researchers at the Consejo Superior de Investigaciones Científicas (CSIC), Hospital Clínic de Barcelona and Universitat Autònoma de Barcelona (UAB), along with scientists from USA, Germany and the Netherlands have also participated in the study, published in journal Environmental Health Perspectives. "

DBPs are formed in pools by the reactions arising from water disinfectants and organic matter that occurs naturally or is produced by the swimmers themselves through sweat, skin cells and urine.

The researchers had previously related to the exposure of disinfection byproducts of drinking water with the risk of bladder cancer, and pointed out that the association was given by dermal and inhalation exposure that occurs during showering, bathing or swimming.

Specifically, the study points to the increased levels of two biomarkers of genotoxicity with the most common DBPs concentration in expired air after swimming, and ensures that the discovery of a biomarker predictor increases cancer risk.

Furthermore, after measuring the exhalation of individuals before and after swimming, the researchers found changes in a biomarker, a slight increase in the protein CC16, suggesting an increased permeability of lung epithelium.

Swimming is good

Researchers say explicitly that swimming is "positive health impacts", and that these effects would be higher by reducing the levels of DBPs.

This reduction can be achieved by measures such as showering before swimming, bathing cap, avoid urinating in the pool and perform proper maintenance.

The study identified more than 100 DBPs in swimming pool water, some whose presence had already been described earlier in chlorinated drinking water. In fact, research indicates that the pool water is mutagenic at levels similar to that of drinking water, but more cytotoxic - can kill cells at a lower concentration -.

Scientists say that to compare these data more research is needed on the effects of long exposures, not just 40 minutes as well as experiments involving more swimmers.

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