They don’t have breasts because they have incredibly low body fat percentages (for that matter, they probably don’t have regular periods either.) and are probably on an extremely low fat diet. Boobs are fat. Hence, no fat in diet and low body fat = no boobs.
I think it’s a combination of very low body fat and pumped muscle. Many women BBs have breasts to speak of during “regular” times, though I doubt if it could be called a rack of epic proportions. When they pump to inflate the muscles before a competition (very high weight, low reps) the muscle under the breast tissue expands and pulls the skin and breast tissue making them flatter.
Wow, it almost hurt - pulling that reply out of my ass.
Because you never see the ones who do. If they have too large of breasts, then their pecs don’t show, and they never get out of the compulsories in the small competitions, much less make it to the professional ranks.
Now, I’m confused again. I thought right before a competition BodyBuilderss do light weight and lots of reps to show more definition(to make the muscle look more defined so to speak?). So what is right here?
Low body fat percentage. The idea is to eliminate body fat so that the underlying musculature shows through. High repetitions with low weights and high levels of cardiovascular excercise also results in the abscence of mentrual periods, as was pointed out.
If she uses anabolic steriods that will also cause her breasts to diminish in size, her skin to coarsen, and her voice to deepen. It has the reverse effect in men, causing what are commonly called “bitch tits.” Also testicular atrophy, acne, and possible prostate enlargement.
handy nailed it, but I just wanted to add a comment.
First, as handy said, some female body builders do have ‘normal’ breast sizes.
More importantly, many had small breasts before they got started in body building. In fact (and this is the point I wanted to make), the number one reason women get involved in body building is because they started out trying to use weight training to build up their chest sizes.
Therefore, the ‘population’ is biased towards women with small breasts. This is not to say that low body fat, supressed estrogen levels, steroid use, and other factors don’t play a role, as well.
rmariamp is correct. Mostly what you see is “fat storage units”. The glands are quite small and don’t begin production of milk (and thereby enlarge) until given the correct hormonal signal from the body during pregnancy.
If you’ll also notice, most don’t have that little “pooch” of fat at the lower abdomen that most women have. This is also an area where women store fat reserves.
As handy mentioned also, their periods are probably really screwed up too. Fat produces estrogen (or estrogen precursors) so a woman whose body fat is too low will have wacky or no menstrual cycles. When I was in the military, my body fat was down to about 18%, which is pretty low for a woman, and my cycles were very irregular. I think the normal % is about 23-25% for women.
[anecdote]I used to know a woman BB/powerlifter that had [Monty P] HUUUGE tracts of land [/Monty P]. She wouldn’t have a chance in the “form” competitions, but she was [Eastern Euro] strong like bull [/Eastern Euro]. She dropped a lot of body fat, but not enough to lose those breasts.[/anecdote]
The typical BB in search of form has such a low body fat percentage that the breasts are cannibalized by the body. The milk production machinery is still there, but dormant (as it is in a non-pregnant, non-nursing woman), since the ovaries don’t ovulate when the body fat %age is so low (you are obviously starving, why put your body through a pregancy?).