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It's from a few outdated studies that show hormonal response peaks at around 45-60 min and declines after that. It's also why many weightlifting programs limit sessions to 45-60 minutes but spread work throughout multiple sessions. I think now most people consider this to be a bunch of BS since the studies have too many externalities to really be meaningful and the actual level of hormonal response is insignificant compared to the benefits of having well structured overall programming.
Didn't know this was outdated, i guess i read it on some site with otherwise sound advice and just swallowed it all :redface: