Not valid eh? Pull up a chair so I can pour you a pint of validity.
You do realize that women lose breast size when they lose body fat? You might also know that endurance training helps reduce body fat. Therefore endurance training can lead to a decrease in breast size.
It's a proven fact that non augmented women will usually shrink their breast size when undergoing lots of endurance training.
So as a coach I do know that a shrinking breast size could indicate a loss of body fat.
Very low body fat in women can contribute to amenorrhoea. Also very low body fat and extreme endurance training can have negative effects on the endocrine system. This can cause your HGH, TSH, ACTH and other levels to be off. Which can cause bad things to happen that may take a long time to reverse. Not to mention that women also tend to see an increase in stress fractures once they become amenorrhoeic.
So yes, I am well aware of breasts in female athletes. To the lay person they are something nice to look at and touch, but to an educated coach they can be a indicator that something is amiss should they rapidly start to shrink.
Brian Stover USAT LII
Accelerate3 Coaching Insta