June 01, 2011
Less Sleep Lowers Testosterone

Guys, if you want to keep up your testosterone then get enough sleep.

Cutting back on sleep drastically reduces a healthy young man's testosterone levels, according to a study published in the June 1 issue of the Journal of the American Medical Association (JAMA).

Eve Van Cauter, PhD, professor in medicine and director of the study, found that men who slept less than five hours a night for one week in a laboratory had significantly lower levels of testosterone than when they had a full night's sleep. Low testosterone has a host of negative consequences for young men, and not just in sexual behavior and reproduction. It is critical in building strength and muscle mass, and bone density.

"Low testosterone levels are associated with reduced well being and vigor, which may also occur as a consequence of sleep loss" said Van Cauter.

Getting less than 5 hours sleep per night will lower testosterone as much as aging 10 to 15 years.

At least 15% of the adult working population in the US gets less than 5 hours of sleep a night, and suffers many adverse health effects because of it. This study found that skipping sleep reduces a young man's testosterone levels by the same amount as aging 10 to 15 years.

Once full body rejuvenation becomes possible it will create not just a more useful society but also one where, due to restored testosterone levels, men become more energetic, aggressive, and driven.

Share |      Randall Parker, 2011 June 01 10:56 PM  Brain Sleep


Comments
N.O.W. said at June 3, 2011 1:20 PM:

"Once full body rejuvenation becomes possible it will create not just a more useful society but also one where, due to restored testosterone levels, men become more energetic, aggressive, and driven."

Not if *we* can help it!

Wolf-Dog said at June 4, 2011 9:43 PM:

In addition to testosterone, the so-called free testosterone and the weakly bound testosterone is sometimes measured by leading endocrinologists. It is possible to have very high blood testosterone but the biologically active components (free and weakly bound testosterone) can be very low despite high blood testosterone. This can happen not only due to stress caused by lack of sleep, but also due to various kinds of inflammation. It is written in the medical literature that stomach ulcers cause low testosterone (probably low free testosterone) and also low T3 and also resistance to T3 (T3 = triodothyronine, which is the biologically active form of thyroid hormones). Any kind of chronic inflammation would distort many hormones including, but not just testosterone.

But to clarify the function of sleep: sleeplessness causes an imbalance of cortisol and this would distort not only the T3 levels but also the testosterone levels (especially free testosterone). So sleeplessness is just one reason testosterone would drop, but other causes of stress would also cause declines in T3 and testosterone.

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