Short answer: yes.
Slightly longer explanation and what you can do about it:
Low body temperature negatively impacts breast development. It actually causes a lot of problems in your body and the impact on breast development is the least of the worries. If at all possible you should try increasing the water temperature to something much closer to your typical core body temperature. For most people that's around 99 degrees F.
But 80 or so should be reasonable for your pool water. If it's already around 80 and it's NOT ok, then crank it to 90. Only take it as hot as you NEED to. Since you are exercising your body will be producing it's own heat as well... As long as the net core body temperature stays between 97-100 degrees F, that's where you want to be. And the more stable and closer to your typical core temperature, the better...
As a female your typical core temperature actually fluctuates quite a bit though, so you'll want to measure before starting the exercise to establish just what your target should be. And then try to keep it stable around that!
EDIT: BTW... If you want to learn more a good place to start is (gasp!) the wikipedia page about human body temperature.
http://en.wikipedia.org/wiki/Human_body_temperature
Slightly longer explanation and what you can do about it:
Low body temperature negatively impacts breast development. It actually causes a lot of problems in your body and the impact on breast development is the least of the worries. If at all possible you should try increasing the water temperature to something much closer to your typical core body temperature. For most people that's around 99 degrees F.
But 80 or so should be reasonable for your pool water. If it's already around 80 and it's NOT ok, then crank it to 90. Only take it as hot as you NEED to. Since you are exercising your body will be producing it's own heat as well... As long as the net core body temperature stays between 97-100 degrees F, that's where you want to be. And the more stable and closer to your typical core temperature, the better...
As a female your typical core temperature actually fluctuates quite a bit though, so you'll want to measure before starting the exercise to establish just what your target should be. And then try to keep it stable around that!
EDIT: BTW... If you want to learn more a good place to start is (gasp!) the wikipedia page about human body temperature.
http://en.wikipedia.org/wiki/Human_body_temperature