Quote:
Originally posted by 10iscoach:
In a recent study, high mileage runners had lower levels of testosterone, sperm count, and sperm mobility compared to moderate mileage runners.
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Okay, but is high mileage running the CAUSE of the lower levels of testosterone, sperm count and mobility? Or is running just a proxy for something else that isn't actually related to running like low body mass or low body fat? _That's_ the million dollar question.