T levels throughout the day

[mbdowning]

Can anyone come up with a link to a chart showing T plotted throughout the day? I know T peaks early in the morning, and then goes down, but how much in terms of ng/dl?

[pmgamer18]

Are you looking for a chart on men not on TRT. I have this on men on diff. TRT's.
http://forum.mesomorphosis.com/attac...3&d=1139879356

[Cynical Simian]

Not very much. Also note, as mentioned on a thread here a couple days ago, the second, smaller peak in the evening.

[1cc]

Testosterone levels over a 24 hour period. Check attached chart.

[JustOne]

Is there any biological reason for them to be lower in the afternoon and night? I mean is there any benefit to them actually fluctuating?

[JustOne]

Well this doesnt explain the day to day fluctuations but explains longterm natural fluctuations:

The trouble is, as with most hormones, blood levels of testosterone vary according to stress levels, age and other physical demands. After adolescence, most men experience a gradual decline in testosterone levels until they hit their 40s; past 50, the decline speeds up dramatically. But if they are put (or put themselves) in positions of high competitiveness or of life-and-death, levels increase significantly. In combat, for instance, soldiers' levels rise quickly and remain high for the duration of the war. It's the same in sexual combat: married men's levels are generally lowered (nature's deterrent to philandering) but if they separate or divorce, their levels rise in preparation for braving the singles minefield.

A man's testosterone levels drop significantly when he holds an infant. Even holding a baby doll can decrease levels of the male virility hormone.

Married men, whether fathers or not, have markedly lower testosterone levels than single males, according to one of the first studies of how the hormone changes when men marry and become fathers. Results of the study, done by a team of Harvard University anthropologists, increase our knowledge of human biology and may have implications for so-called "male menopause."

Researchers have long suspected that levels of the hormone largely responsible for fighting, competing, and mating decrease when men settle down and start a family. Other studies have shown that testosterone begins to decline shortly after marriage, but surges upward when unions end in divorce.

"It makes sense," notes Peter Ellison, professor of anthropology. "Lower levels of testosterone may increase the likelihood that men will stay home and care for their wives and kids, while decreasing the likelihood they will go out drinking with the guys and chase other women."

Scientists in the US say single men have higher levels of testosterone than those who are married with children. The researchers, at Harvard University, believe the difference may be linked to men’s daily social interactions, and suggest that constant contact with close family reduces the level of the hormone in married men and encourages them to be faithful. The findings are consistent with those of previous studies showing that rising testosterone levels can cause men to play the field.