We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
Now, this is important because it's been shown over and over again that if one exercises too long with weights or endurance exercise, that cortisol levels go high enough that it starts to inhibit the testosterone and even the estrogen pathways.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
And if the session extends too long, past 75 minutes and is of sufficiently high intensity chances are testosterone levels will start to drop and cortisol levels will go up in ways that can be detrimental to recovery and the goals of the training.
do not-- it is not hormonally helpful to train, especially regularly train, vigorously for longer than an hour.