Researchers were surprised to find that occupations associated with higher levels of testosterone also showed increased estrogen levels.
A new study analyzed semen samples from 377 men to determine whether occupation type has an impact on reproductive health. They found blue-collar workers have almost 50% higher sperm counts than their white-collar counterparts.The participants — who had an average age of 36 — were required to self-report their level of physical exertion at work and how often they lifted heavy objects while on the job.
Nevertheless, the latter group had significantly stronger sperm counts overall. Men who claimed to spend most of their day “lifting or moving heavy objects” had 46% higher sperm concentrations. Researchers were surprised to find that occupations associated with higher levels of testosterone also showed increased estrogen levels, leading them to believe that excess male hormone was being converted to the female hormone to keep their hormonal balance in check.
Indeed, numerous other studies have found that physical activity — not necessarily at work — has a positive impact on sperm count.
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