It had never occurred to me that this was an issue for men!
Thanks for posting the article... I have sent the link on to few others.

The thing that isn't mentioned in here is the diet of serious and/or elite cyclists which, without supplements or careful monitoring (or both), would lack in calcium and other essential nutrients...

What do we all want ? To drop weight so we are faster up hills, so our power:weight ratio improves, so we are more aerodynamic... so we try to lose weight. In male cyclists its that under 10% body fat that they aim for. Natural thing to cut out - dairy... high in fats, lactose sugars and calcium...

I think a study like this should also have considered diet, because that MUST be a factor in bone density (or lack thereof...)