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Testosterone and Loss of Erection

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Testosterone and Loss of Erection

In the male, the brain releases the hormone LHRH .

Injury, illness, starvation, surgery—all of these drive down testosterone levels. (Location 2034)

Lower the dominance rank of a social primate and down go his Testosterone levels. (Location 2037)

With the onset of stress, two important classes of hormones, the endorphins and enkephalins (mostly the former), act to block the release of LHRH from the hypothalamus. (Location 2043)

Males who do extreme amounts of exercise, such as professional soccer players and runners who cover more than 40 or 50 miles a week, have less LHRH, LH, and testosterone in their circulation, smaller testes, less functional sperm. They also have higher levels of Glucocorticoids in their bloodstreams, even in the absence of Stress. (Location 2047)

thirty-year-old athletes who run 40 to 50 miles a week can wind up with decalcified bones, decreased bone mass, increased risk of stress fractures and scoliosis (sideways curvature of the spine)—their skeletons look like those of seventy-year-olds. (Location 2057)

With the onset of stress, LHRH secretion declines. In addition,Prolactin , another pituitary hormone that is released during major stressors, decreases the sensitivity of the pituitary to LHRH. (Location 2063)

Finally, when you can’t take it anymore, the parasympathetic shuts off at the penis, the sympathetic comes roaring on, and you ejaculate. (Location 2079)
⇒ Sympathetic Nervous System (SNS)
⇒ Parasympathetic Nervous System (PNS)

if you are close to ejaculating and don’t want to yet, take a deep breath. Expanding the chest muscles briefly triggers a parasympathetic volley that defers the shift from parasympathetic to sympathetic. (Location 2081)

Take a handy little penile cuff with an electronic pressure transducer attached to it. Have him put it on just before he goes to sleep. By the next morning you may have your answer—if this guy gets an erection when he goes into REM sleep, his problem is likely to be psychogenic. (Location 2096)