What I've been learning about testosterone in the literature (I'm very much not done learning) 1/n
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Sanity check: as you'd expect, administering testosterone to elderly men raises their serum testosterone levels to those of healthy young men, eg.https://www.nejm.org/doi/full/10.1056/nejmoa1506119 …
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Studies reliably find that testosterone spikes temporarily in men, by 20-40%, after exposure to erotic stimuli, e.g. https://www.sciencedirect.com/science/article/pii/0306453085900411 … does this mean that more sexual activity would increase a man's long-term average T or fertility? (2/n)
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Exercise also causes a short-term spike in men's testosterone, e.g. https://link.springer.com/article/10.1007/BF00423247 … common knowledge says that regular exercise increases long-term average T, but haven't yet found a study claiming it. (3/n)
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There's a big literature around the competition effect -- that T spikes around competitions, especially for the winner. A lot of inconsistency in results here though; I'm reserving judgment for now. (4/n).
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Likewise, there's a lot of ambiguity in whether more violent men have higher testosterone or not. I'm reserving judgment until I've read in more depth. I assumed there'd be a clear-cut association but apparently there are both positive and negative results. (5/n)
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Military bootcamps reliably reduce T for the duration of the course (it recovers afterwards.) Not clear if this is from stress, sleep deprivation, food deprivation, or exercising to exhaustion (or something else). https://jamanetwork.com/journals/jamapsychiatry/article-abstract/490664 … (6/n)
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American hostages upon being freed from captivity in Iran had T levels 4x higher than normal. It's a striking result. Invites a lot of speculation about freedom/captivity as a hormonal signal. https://psycnet.apa.org/record/1990-19789-001 … (7/n)
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Replying to @s_r_constantin
But can we tell if it was from being captives or from being released?
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no, unfortunately. Can't very well tell the Iranian government to please run blood tests on hostages and share the data with us!
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Replying to @s_r_constantin
There could be delayed physiological markers of increased testosterone.
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