The fact that hot tubs reduce sperm production and motility is well known. If fact, I read recently that a single trip to the hot tub can seriously reduce fertility for up to six months. What I haven't been able to find out in my research is whether or not hot tubs affect testosterone production. I can't imagine frying my testes in a hot tub would do any good in this regard but I'm wondering if it can have a similar effect on testosterone production as it does on sperm production. Reduced test levels for weeks or even months after only 20 minutes in a hot tub would really suck. Does anyone have any information on this? I enjoy the occassional hot tub
02-05-2006, 12:00 AM #1
Hot tubs and testosterone production
05-31-2014, 05:31 PM #2
It is no secret that heat near the testes (testicles) can lead to greatly reduced fertility. Everything from spas to laptop can lead to sperm cell death among other things. But what about testosterone levels themselves? Can heat near the testicles lead to decreased testosterone levels?
The answer to that is a little more complex and we have to go to animal studies to get some answers and insight. First of all, heat will definitely shrink the testes, something most men are not too excited about. In a study of rams, heat actually shrunk the testes by about a third by weight.  This is particularly remarkable, because the rams were not subject to ultrahigh heat, but rather constant heat in the 28-23 degrees Celcius range (82-90 degrees Fahrenheit) continuously for two weeks.
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Of course, shrunken testicles is a very bad sign. But does this mean testosterone was actually lowered? A study on increasing heat using rats showed that that FH and LSH rose. Now testosterone, interestingly enough, did not change, but the testes became less responsive. So it is as if there was a "partial secondary hypogonadism" even though testosterone levels did immediately fall.  In fact, the authors concluded that "it appears that the testosterone produced by Leydig cells from heated testes may not be secreted as effectively as in normal testes."
So, obviously, something is going on. And, in fact, one study actually looked at using a combination of exogenous (applied from outside the body) testosterone plus heat to create a male contraceptive.  It was so effective that it almost reduced sperm counts to zero.
But does heat affect testosterone levels. One study on boars shows that initially heat may not affect testosterone levels  However, eventually baseline T levels are actually decreased. In other words, it appears there may be a time lag from the application of the heat to the time that testosterone actually decreases. This was verified in the study on rams that showed that testosterone decreased significantly after a two week period.  One study on monkeys verified the same thing: a time lag loss of testosterone after 6 days of 30 minutes heat treatment of the testicle area. 
05-31-2014, 05:33 PM #3
Temperature only affects sperm production
not testosterone levels
it's how a man can have undescended testicles and still have normal sexual development, but his testes will be infertile
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05-31-2014, 05:33 PM #4
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