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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Modern-day hunter-gatherers, such as the Ache, have much *lower* T than men in developed countries. https://link.springer.com/article/10.1007/BF02692109 … … The authors think it's probably a result of parasites & infectious disease. (8/n)
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Baboons exposed to a stressor (injections) have sharply differing testosterone responses. Dominant males experience a spike in testosterone, while subordinate males experience a drop. https://www.sciencedirect.com/science/article/pii/0018506X82900277 … (9/n)
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Sleep deprivation reliably causes a large (temporary) drop in testosterone, e.g. https://www.sciencedirect.com/science/article/pii/S0301051112002037 … (10/n)
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Does *repeated* performance of activities that temporarily raise/lower T levels result in *chronically* higher/lower T or changes in fertility? I don't know yet. (11/n)
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I couldn't find any population studies examining secular trends in cortisol levels, or population-level correlations between cortisol & testosterone levels. (12/n)
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I also couldn't find any studies examining the association between testosterone and occupation (do men with physical labor jobs have higher testosterone than men with sedentary jobs?) (13/n)
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