Men's testosterone levels declined in last 20 years

[size]

Men's testosterone levels declined in last 20 years
By Anne Harding

NEW YORK (Reuters Health) - A new study has found a "substantial" drop in U.S. men's testosterone levels since the 1980s, but the reasons for the decline remain unclear. This trend also does not appear to be related to age.

The average levels of the male hormone dropped by 1 percent a year, Dr. Thomas Travison and colleagues from the New England Research Institutes in Watertown, Massachusetts, found. This means that, for example, a 65-year-old man in 2002 would have testosterone levels 15 percent lower than those of a 65-year-old in 1987. This also means that a greater proportion of men in 2002 would have had below-normal testosterone levels than in 1987.

"The entire population is shifting somewhat downward we think," Travison told Reuters Health. "We're counting on other studies to confirm this."

Travison and his team analyzed data from the Massachusetts Male Aging Study, a long-term investigation of aging in about 1,700 Boston-area men. Data from the men were collected for three time intervals: 1987-1989, 1995-1997, and 2002-2004.

While a man's testosterone level will fall steadily as he ages, the researchers observed a speedier decline in average testosterone levels than would have been expected with aging alone.

They hypothesized that the rising prevalence of obesity as well as the sharp decline in cigarette smoking might help explain their findings, given that testosterone levels are lower among overweight people and smoking increases testosterone levels. But these factors accounted for only a small percentage of the observed difference.

It's likely that some sort of environmental exposure is responsible for the testosterone decline, Travison said, although he said attempting to explain what this might be based on the current findings would be "pure conjecture."

The researchers used body mass index, the ratio of height to weight, to estimate obesity levels, he noted, but this is not a very accurate way to gauge the real adiposity, or fat content of the body, so it's possible that obesity might be more of a factor than it appears in this analysis.

"I think like most things that are complex, it's likely that there is no one cause," he said.

SOURCE: Journal of Clinical Endocrinology and Metabolism, January 2007.

 

[Beebs]

Smoking raises test levels?

 

[CRUNCH]

Smoking raises test levels?

That's new to me as well!

I wonder if all the estrogen being leaked by plastic products is contributing also. More pre-packaged foods that get cooked in the microwave, etc...

 

[size]

That's new to me as well!

I wonder if all the estrogen being leaked by plastic products is contributing also. More pre-packaged foods that get cooked in the microwave, etc...

I found the smoking remark to be odd. However, the article overall is something that I find really interesting. Too me, this is a huge issue that men should try and demand answers to. It would be interesting to see if this is takign place world wide in developed nations.

 

[xtraflossy]

It's likely that some sort of environmental exposure is responsible for the testosterone decline, Travison said, although he said attempting to explain what this might be based on the current findings would be "pure conjecture."

Now, this may seem off the deep end, but....
In some research I have been doing on the biologicial causes of attraction, and how to trigger it (Attraction isn't a choice) I have found something that might be of interest.

Over the past 50 years, MANY "male" traits that have ensured survival have been on the decline.
The things that were once necessasary long ago to ensure survival (such as aggression, certin male pheramones/ hormones...) have been on the decline. Since they are no longer "needed" ,.. or their evolutioned out so to speak.
Anyways,.. the way I kind of see it, has to do with the FEMALE's shift in thought process and selection. This is a VERY slight trend, although it is measureable. Females no longer choose the best protectors as they did once. Being a good provider (among everything else) has come centerstage.
The more capable we become to listen to reason, (as opposed to surviving simply on primal responses) the more females are inclined to choose less "manly" traits in favor of the things that now prove to be more key to sucess (like money, good job, stability..) ... this can also be linked to being on Birth controll (which would explain wh yyour not getting AS many unexpected pregnencies now due to 'giving in to the attraction that causes us t ohave sex in the first place).
So with the pill preventing the "alpha male" genes from being passed on, more and more females are having children while in more "stable" relationships, which isn't necessarilly based of the most "alpha male" traits....
Anyways- with this progression, it's not so much a suprise that the avarage testosterone levles have declined.


.........Just a though

 

[wastedwhiteboy2]

I read another article that said mens test levels go up when they watch MMA fighting or handle guns. I think in part test levels are decreasing because its becoming politically incorrect to be a man. Look at john wayne's stereotype and how the word cowboy has taken on a negative connotation. I'm not a hick but I admire how cowboys actually acted like men. I'm sure there is more to it than this but its a thought.

 

[xtraflossy]

I read another article that said mens test levels go up when they watch MMA fighting or handle guns. I think in part test levels are decreasing because its becoming politically incorrect to be a man. Look at john wayne's stereotype and how the word cowboy has taken on a negative connotation. I'm not a hick but I admire how cowboys actually acted like men. I'm sure there is more to it than this but its a thought.

Thats kinda sorta in a way what I was talking about

However, .. the good news is,.. females still find certin traits very attractive!!!! :bb:

Which, while they may not choose to raise families with the most "manly" men,... they still (as much as ever) will sleep with em :icon_lol:

 

[size]

In my opinion, there seems to be a shift in males to move away from masculinity. Current situations(again totally my opinion) encourage the demasculination of men.
I think about the typical thoughts on men using hormones. The usage of synthetic hormones via birth control is encouraged for girls of all ages. However, the thought of men using hormones, namely testosterone, for health or choice is frowned upon.

 

[Mass_69]

Smoking raises test levels?

The only logic I could see with that is there is a known correlation with high dopamine levels, and high testosterone levels. Smoking (nicotine) causes a spike in dopamine... Although I'm not too sure about this because I thought it was Test that caused high dopamine :think:

 

[xtraflossy]

In my opinion, there seems to be a shift in males to move away from masculinity. Current situations(again totally my opinion) encourage the demasculination of men.
I think about the typical thoughts on men using hormones. The usage of synthetic hormones via birth control is encouraged for girls of all ages. However, the thought of men using hormones, namely testosterone, for health or choice is frowned upon.

There is definately a movement encouraging the demasculination of men!!
some "other" ways are things like:
Boys raised by single mothers,
Females going for the more "sensative" guy,
Societies encurragement of equality in ALL areas between sexes..

Being Male (in the most "male" sense of the term) is becoming to be seen as "primitive" and "out of fassion"....
While empowering females increasingly fullfill the traditionally male roles


Eventually, Men will be week,.. and Woman will inherit the earth!! (and then we'll remember where we came up with the word "woman" ...... as we glance around us, then at each other... "Whoahhh ..... MAn " )

Disclaimer:
For the love of all thats holy,.. I can see that these changes are happening,.. Im NOT against women in ANY way!!!
The views and opinions expressed here are not necessesairly the views and opinions of the poster.:study:

 

[bioman]

I read another article that said mens test levels go up when they watch MMA fighting or handle guns. I think in part test levels are decreasing because its becoming politically incorrect to be a man. Look at john wayne's stereotype and how the word cowboy has taken on a negative connotation. I'm not a hick but I admire how cowboys actually acted like men. I'm sure there is more to it than this but its a thought.

Well, my take is that the cowboy image has been tainted by all the wannabe's who think a cowboy hat gives them divine right to be a prick. I have met and worked with actual "real" cowboys who work the range and they can be pretty awesome people. Joe-blow with a cowboy hat driving his Dodge ram around the suburbs is not so awesome. lol

 

[Phil T]

In my opinion, there seems to be a shift in males to move away from masculinity. Current situations(again totally my opinion) encourage the demasculination of men.
I think about the typical thoughts on men using hormones. The usage of synthetic hormones via birth control is encouraged for girls of all ages. However, the thought of men using hormones, namely testosterone, for health or choice is frowned upon.

Oooooo! Darn good point! I like the way you think.
I also think the decline in test levels is actually more of an increase in estrogenic levels. You know that soy is an estrogen mimicker, right? That's why soy isoflavones are taken by women to help alleviate the negative symptoms of perimenopause as well as menopause. It's also interesting to note how much soy is present in the average American male's diet. You can't get away from the stuff. Look at the label of the first three things you randomly grab from your cupboard and I'll bet you a bottle of 4 AD one of the first four ingredients is soy related. Is it any wonder that men's test levels are getting lower? Couple that with the fact that we're discouraged from being truly masculine by our politically correct, femininely sensitive society and pretty soon men will need help just getting wood. Oh! That's right... there's a pill for that. Viagra. Wait! There can be an entire segment of big pharma dedicated to profiting from selling bottles of woody pills to soy-filled men as their naural testoterone levels fall into the cellar.
I know that sounds a little "conspiracy theory" but how else do you explain all of this? Why is it that prohormones and anything else that ACTUALLY WORKS to increase testosterone (or manly abilities like lifting big heavy weights) purged from society but soy, political correctness and reverence for all things feminine are shoved down our throats?

 

[papa G]

IMPO if Hillary Clinton becomes president test levels will drop even further. It sounds crazy but you must actually think about it! A woman in power of this country would be the beginning of the end for people like us! We are a dying breed! Growing up I remember seeing HIGH TEST movies like rambo, commando, blood sport, predator, over the top etc. For the most these were main stream! These types of movies always had the badass guy as the main character. What people see on screen plays a big role. Or even on TV they had the A team, dukes of hazard, magyver along with many others. Nowadays the whole MACHO thing has died for the most part. We now have a society where the whole metro/homosexual thing is becoming more accepted in society.

We are making a comeback though. UFC and MMA in the last year has really took off! Certain lawmakers are trying to ban it though! Look at the witch hunt regarding anabolics! I am not sexist but I really believe that if we elect a woman as a president manhood as we know it will be gone! Women in power get the "POWER TRIP" at a higher level from my personnal experience! In the milatary we called it the PRINCESS SYNDROME! JMO!

 

[bioman]

*HeMan Woman Haters Club Thread*

 

[CRUNCH]

*HeMan Woman Haters Club Thread*

:icon_lol:

 

[klugman]

Everything is cyclical. The whole nuanced, soy milk sipping, tofu chunk nibbling Ned Lamont type won't last.

Also, keep in mind that the images the media touts are often far from mainstrean. Those images are just popular within the media's own subculture.

 

[CRUNCH]

And now it's less sperm from our cell phones:

Chat on cell phone, become infertile? - Products - MSN Tech & Gadgets

 

[GREENFEATHER]

Personally I'm going with door #3, hormoned foods. I don't eat them, I grow what I eat and have a T level in the high 800-1000 ng/dl range. Coincidence? I don't think so. I drink my milk straight from the cow, not the udder ya dirty minded bastageS, unpasteurized. I eat only meats that I grow or venison that I kill. Then again, maybe it's the Skoal?:study:
ROB

 

[Mass_69]

The whole nuanced, soy milk sipping, tofu chunk nibbling Ned Lamont type won't last.

You noticed that about Ned Lamont, too, eh?

Yep, I'd say he had a little too much soy... :icon_lol:

 

[jet11]

funny...mens weight keeps increasing on average, health declines, so does test. if thats not motivation to keep in the gym, nothin is

 

[size]

venison that I kill.

:food:

 

[badbart]

I read another article that said mens test levels go up when they watch MMA fighting or handle guns. I think in part test levels are decreasing because its becoming politically incorrect to be a man. Look at john wayne's stereotype and how the word cowboy has taken on a negative connotation. I'm not a hick but I admire how cowboys actually acted like men. I'm sure there is more to it than this but its a thought.

I think you are 100% spot on. American men are turning into sissy's and their hormones are following the trend. Add piss poor diet and men getting fat compounds the problems. I would wager in non westernized countries test levels are higher.

 

[klugman]

You noticed that about Ned Lamont, too, eh?

Yep, I'd say he had a little too much soy... :icon_lol:

Every time I see him on TV he's wearing a pink...er excuse me, salmon tie and he's perfectly tanned.

He's such a lightweight and so transparent. I don't see how anybody can believe him!!!

 

[Aeternitatis]

I wonder if all the estrogen being leaked by plastic products is contributing also. More pre-packaged foods that get cooked in the microwave, etc...

No doubt. Estrogen contamination from food storage is a heavy contributor to the pussification of men (please excuse my sexism). But the problem is MUCH larger than that and in todays world you can't get away from it, only minimize exposure. Know that many of the widely used industrial chemicals, by-products, and pollutants act as endocrine disruptors. This includes everyday things we surround ourselves with: shower curtains, synthetic rugs/clothing, paints/solvents, I could go on and on. Suffice to say, every single aspect of modern civilization contributes to the above mentioned problem.

And as I mentioned, you can't escape it, there are no pristine environments left on this planet. We've somehow managed to contaminate every square inch of living space in our short time here. So, your best bet is to minimize exposure.

 

[Aeternitatis]

It's likely that some sort of environmental exposure is responsible for the testosterone decline, Travison said, although he said attempting to explain what this might be based on the current findings would be "pure conjecture."
[...]
Anyways- with this progression, it's not so much a suprise that the avarage testosterone levles have declined.


.........Just a though

I'm not sure I would call this a progression. Industrial civilization isn't going to last long and someday (sooner than later) those strong male traits are really going to be needed. And I'm not talking about brutish, dumb****, Under Armor, muscle-head bull****. I'm talking about the real strength of a man's desire to protect and sustain his family and community (tribe) at all costs. The metro sexuals just aren't capable of that IMHO.

I honestly believe that it will be us smart, thoughtfull, understanding MEN who will inherit the Earth... so to speak. Truth be told, solid confidence leads to intelligence and the ability to maintain cohesive relationships. That's crucial.

The same argument can be made about the women who are fit for survival. They certainly aren't gonna be the fashion obsessed money-mongering dolls we have walking en masse today.

BTW, in my defesne, I think Tom Leyis is a dumb****. Maybe good advice for an 18 year old, but not a man who stands on his own. Ever seen Leykis? He's obese, balding, ugly, and obviously insecure (though the occasional valid point creeps in). However, his extreme voice is probably a good counter balance to the equally extreme anti-testosterone movement.

 

[Aeternitatis]

IMPO if Hillary Clinton becomes president test levels will drop even further. It sounds crazy but you must actually think about it! A woman in power of this country would be the beginning of the end for people like us! We are a dying breed! Growing up I remember seeing HIGH TEST movies like rambo, commando, blood sport, predator, over the top etc. For the most these were main stream! These types of movies always had the badass guy as the main character. What people see on screen plays a big role. Or even on TV they had the A team, dukes of hazard, magyver along with many others. Nowadays the whole MACHO thing has died for the most part. We now have a society where the whole metro/homosexual thing is becoming more accepted in society.

We are making a comeback though. UFC and MMA in the last year has really took off! Certain lawmakers are trying to ban it though! Look at the witch hunt regarding anabolics! I am not sexist but I really believe that if we elect a woman as a president manhood as we know it will be gone! Women in power get the "POWER TRIP" at a higher level from my personnal experience! In the milatary we called it the PRINCESS SYNDROME! JMO!

I think you're a little off base with this. But some of your points make a lot of sense.

First off, macho should die. It is posturing. That's not manly at all. It's insecurity.

Second, who's give a **** if Hillary is pres? Why should that affect YOUR man-hood? Can't you remain strong in the face of such things? Is your masculinity so fragile that it would be disrupted by a woman leader. A real man knows that no matter who is "commander in chief", the final decision remains in his own heart. A real man has enough inner strength to not have to vie for power... he lets the bable have it's bottle any moves on.

Third, violent movies and MMA are not what it means to be manly either (as much as I enjoy both, First Blood is a powerful film). I think men have an uncanny ability to negotiate and forego violence. They've just been conditioned to think that men are supposed to fight. Real men use the strength in their words before that in their fists... but they're not afraid to use either one.

Okay, I'll get off the podium. :run:

 

[Aeternitatis]

Personally I'm going with door #3, hormoned foods. I don't eat them, I grow what I eat and have a T level in the high 800-1000 ng/dl range. Coincidence? I don't think so. I drink my milk straight from the cow, not the udder ya dirty minded bastageS, unpasteurized. I eat only meats that I grow or venison that I kill. Then again, maybe it's the Skoal?:study:
ROB

Can I come lend a hand on your farm for some fresh milk? I'm working with my mom to eventually buy some good land up here in WA and raise/grow our own food. But I've got a lot to learn yet.

 

[DR.D]

The only logic I could see with that is there is a known correlation with high dopamine levels, and high testosterone levels. Smoking (nicotine) causes a spike in dopamine... Although I'm not too sure about this because I thought it was Test that caused high dopamine :think:

No, it has to do with adrenal pathways and DHEA levels, but yes smoking is masculinizing. I have told you guys this before! Ironically, smoking also tends increase fat deposits on the chest in men specifically (so it won't help your girlfriend).

Also, coffee is estrogenic just the opposite of smoking. Caffeine supports estrogen dependant growth and fibrosis of responsive sex tissues. I always thought is was strange that I was told as a kid coffee would "put hair on my chest". Yeeeeah, not really!

So put down the java and smoke 'em if you got 'em. (j/k)

 

[klugman]

Also, coffee is estrogenic just the opposite of smoking. Caffeine supports estrogen dependant growth and fibrosis of responsive sex tissues.

YIKES!!!

I love my caffeine as my main pre-workout stimulant...

 

[sdmf45]

its all that metrosexual bull**** where all the guys are turning in little B****s and eat mcdonalds for breakfast lunch and dinner and don't even think of working out........also most of the girls now (not all of them) are goin for the little wuss guy that likes to were shoes that match his hat and sh** .....lol.....i feel better now

 

[klugman]

its all that metrosexual bull**** where all the guys are turning in little B****s and eat mcdonalds for breakfast lunch and dinner and don't even think of working out........also most of the girls now (not all of them) are goin for the little wuss guy that likes to were shoes that match his hat and sh** .....lol.....i feel better now

Bro I hear you!

I see so many young guys that come into the gym and they look like they were just liberated from Bergen Belsen or something.

I am talking about incredibly gaunt...almost emaciated fopsters!!!

 

[DR.D]

its all that metrosexual bull**** where all the guys are turning in little B****s and eat mcdonalds for breakfast lunch and dinner and don't even think of working out........also most of the girls now (not all of them) are goin for the little wuss guy that likes to were shoes that match his hat and sh** .....lol.....i feel better now

Yeah, I agree. I see lots of guys trying to play this role. And what the F is salmon? That's not a shirt color a guy should be wearing. Black, white or grey, those are your options wussy man! With jeans and some nikes. And a smoke haggin' outta your mouth. A real man is gonna end up getting plenty of tang anyway without having to match his shoes or cut his cuticles.

 

[Iron Warrior]

its all that metrosexual bull**** where all the guys are turning in little B****s and eat mcdonalds for breakfast lunch and dinner and don't even think of working out........also most of the girls now (not all of them) are goin for the little wuss guy that likes to were shoes that match his hat and sh** .....lol.....i feel better now

I agree bro. I can't stand that because my sister is going out with one of those fvckers ! On the bright side, if a woman doesn't go for you because you hit the iron with a passion and you do most of your shopping at Costco then you don't really want to be with her
Some chick actually even stopped dating me because I listened to Metallica and she said they were too aggressive, good riddance for both of us LOL

 

[size]

I praise testosterone when ever I get the chance. For me, it is a personal cause to reduce the negative attitude so many people have towards it.

 

[Aeternitatis]

Yeah, I agree. I see lots of guys trying to play this role. And what the F is salmon? That's not a shirt color a guy should be wearing. Black, white or grey, those are your options wussy man! With jeans and some nikes. And a smoke haggin' outta your mouth. A real man is gonna end up getting plenty of tang anyway without having to match his shoes or cut his cuticles.

I agree with most of that. But couldn't you have thought of something better than Nike? Like, a good work boot. Maybe Lugz or something? Timberland maybe? Perhaps a good pair of engineers boots (I miss my old ones).

Hmm, I realize I'm only saying this because the boots I'm wearing now I so worn out... but I don't wanna give them up. Good brown leather boots lasted me through some tough s**t. Hi-Tec brand, no heel, all-purpose boots. I promised myself I wouldn't cry about this... :icon_lol:

 

[DR.D]

I agree with most of that. But couldn't you have thought of something better than Nike? Like, a good work boot...

Haha, yeah you're right. They can be boots as long as they're steel-toes! Guys can get silly with the Timberlands too. And you have to water proof them and no fruity laces either! (lol)

 

[Aeternitatis]

Haha, yeah you're right. They can be boots as long as they're steel-toes! Guys can get silly with the Timberlands too. And you have to water proof them and no fruity laces either! (lol)

And when you water proof them you can't use the spray. You gotta do that s**t the way my dad taught me... with a can of the grease and an old rag.

BTW, Timberland came out with a steel-toed cross trainer. Could be good for those guys who have a tendency to drop dumbbells on their toes. :blink:

 

[Zero Tolerance]

What a coincidence.. The demasculination of men is becoming commonplace and our testosterone levels are actually diminishing.. So "the man" (or whatever he is now - the semi-man) is sticking it up our asses on two different levels. One, via television (women wear the pants), and another - who knows how? Something in our food / water? What next?

 

[fitnecise]

I would venture to say that it is mostly the weight gain coupled with the low fat diet fad that continues to this day.

 

[fitnecise]

Re: Smoking raising test levels...

I know nicotine is an aromatase inhibitor, one reason

 

[BigVrunga]

In some research I have been doing on the biologicial causes of attraction, and how to trigger it (Attraction isn't a choice)...

That's a damn good book...

 

[okboy63]

I'm going to go with the weight gain of society. I would like to see if the testerone level of chinese men in china has dropped much. Lots of those men still live hand to mouth and are very slim.

I seem to remember Mike Mentzer saying that stress in men was related to our inability to kill stuff like we were meant to do. Whether it be meat for food or enemies of our tribe etc.
I think you might have more civil discourse in society if the potential for death existed if you screwed around with the average joe(at least it would give the average thug something to think about).
The idea of letting some one who has no connection to you, protect you is a very unmasculine idea(don't fight back just call the police).
If society broke down completely and you had no other recourse I'm sure the average testerone level would rise.

 

[DR.D]

I'm going to go with the weight gain of society ... I seem to remember Mike Mentzer saying that stress in men was related to our inability to kill stuff like we were meant to do ... If society broke down completely and you had no other recourse I'm sure the average testerone level would rise.

Excellent insights indeed! I think environmental toxins/estrogens play a significant role in idiopathic hypogonadism these days too.

It's true, men are driven by a primal urge to hunt/kill. Testosterone plays a major role in that. Sports and weight training are the healthiest release of natural male aggression for normal men.

We do clearly live in a decaying society so anarchy seems inevitable. I bet that the average testosterone level does rise when it finally breaks down because aggression and strength will convey a survival advantage (survival of the fittest) as will anabolic capacity, because in a state of famine fewer calories will go farther with high test levels. I know my test levels will spike sharply on that day, if you know what I might be saying.

 

[fitnecise]

I bet that the average testosterone level does rise when it finally breaks down because aggression and strength will convey a survival advantage (survival of the fittest) as will anabolic capacity,

Aggression and testosterone levels aren't correlated.

 

[Son Of Man]

Oooooo! Darn good point! I like the way you think.
I also think the decline in test levels is actually more of an increase in estrogenic levels. You know that soy is an estrogen mimicker, right? That's why soy isoflavones are taken by women to help alleviate the negative symptoms of perimenopause as well as menopause. It's also interesting to note how much soy is present in the average American male's diet. You can't get away from the stuff. Look at the label of the first three things you randomly grab from your cupboard and I'll bet you a bottle of 4 AD one of the first four ingredients is soy related. Is it any wonder that men's test levels are getting lower? Couple that with the fact that we're discouraged from being truly masculine by our politically correct, femininely sensitive society and pretty soon men will need help just getting wood. Oh! That's right... there's a pill for that. Viagra. Wait! There can be an entire segment of big pharma dedicated to profiting from selling bottles of woody pills to soy-filled men as their naural testoterone levels fall into the cellar.
I know that sounds a little "conspiracy theory" but how else do you explain all of this? Why is it that prohormones and anything else that ACTUALLY WORKS to increase testosterone (or manly abilities like lifting big heavy weights) purged from society but soy, political correctness and reverence for all things feminine are shoved down our throats?

^I was just thinking that. You cant get away from that ****. tThey put that stuff in everything! F*** soy. Thats **** is for f**s and women. They might as well change the name from soy bean to h*** bean. And I dont get it I see these hott girls with these guys that I can hardly tell their male. if you can be confused for a women at any distance then your a f**. its sickening!

 

[DR.D]

Aggression and testosterone levels aren't correlated.

Haha, good one man! :lol:

 

[fitnecise]

Haha, good one man! :lol:

? Not joking, there is plenty of evidence in studies of criminals considered "violent," many have lower test levels than normal. I think this explains it fairly well: Does Testosterone Really Lead to Aggression?

Googleing testosterone and aggression, for example brings up tons of articles suggesting it is not correlated. I'll search through some lit tomorrow if you want more.

 

[fitnecise]

eh heres a few:

Entrez PubMed
Arch Gen Psychiatry -- Abstract: Effects of Supraphysiologic Doses of Testosterone on Mood and Aggression in Normal Men: A Randomized Controlled Trial, February 2000, Pope et al. 57 (2): 133
IngentaConnect The relationship between testosterone and aggression: a meta-anal... (not strong evidence)

Animal studies are strong, however for humans the data isn't very conclusive.

 

[DR.D]

Fitnecise,

I don't understand? Most of those studies you cite did assert a relationship between test levels and aggressive behavior, though they were not able to totally quantitate the implications. There is simply no doubt that endocrine fluctuations have a profound influence of motor behavior. The castration study in particular is proof in it's purest form actually. Just ask anybody who has taken high dose test, Halotestin, mibolerone, methyltest or any other very strong androgen and high enough doses and they can tell you too as a matter of common observation or subjective experience.

Aggression and libido are often enhanced rather proportionally. Many many studies link GABA(a) interaction as a cause of aggression which in turn is often directly linked to sex behavior in animals. It's like the opposite effect of Valium as it antagonizes the relaxing actions of GABA transmission. Even DHEA is a mild stimulant due to it GABA antagonizing effect. GABA antagonism is also positively linked to a reduction in refraction time in between mating in males. It is all so clearly connected that it is just not valid to deny these facts any more. Do a little more digging and you'll see what I mean.

 

[size]

Dr.D...I have actually read somewhere about aggression in relation to low testosterone levels in males. I cant recall where so I will have to look.