A recent study indicates that boys who swam in indoor chlorinated
pools had concentrations of inhibin B (a testicular hormone
biomarker) and total testosterone about 20 percent lower than those
of boys who swam in a pool disinfected with copper–silver
ionization. Those who swam in the chlorinated pool were also more
likely to have abnormally low concentrations of these hormones. The
research consisted of almost 400 primarily white boys, ages 14-18.
Study authors, Alfred Bernard and Marc Nickmilder compared serum
levels of several testicular hormone biomarkers between the two
groups. They suggest that chlorine disinfection byproducts may
cause the hormone variations. Read more...