Men who regularly lift heavy objects at work have almost 50 percent higher sperm concentration and count.
, is "part of the Environment and Reproductive Health cohort, aimed to examine how environmental chemicals and lifestyle choices affect reproductive health.
“Further, there is increasing evidence that male infertility is associated with common chronic diseases such as cardiovascular disease and autoimmune disease, highlighting the broader importance of male reproductive health,” said Mínguez-Alarcón.The study was done using the data collected by the EARTH study, which was done by the Harvard T. Chan School of Public Health and Mass General Brigham, to gauge the impact of environmental and lifestyle factors on fertility.
“Contrary to what some people remember from biology class, ‘male’ and ‘female’ hormones are found in both sexes, but in different amounts. In this case, we hypothesize that excess testosterone is being converted into estrogen, a known way for the body to keep normal levels of both hormones," said Mínguez-Alarcón.
The team plans to confirm if these findings will hold for men from the general population. The researchers also hope future studies will reveal the underlying biological mechanisms. “Uncovering actionable steps people can take to improve their fertility stands to benefit all of us, not just couples trying to conceive," according to Mínguez-Alarcón.
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