[magicalist]

> Elevated cortisol (in response to the stress of running or whatever) increases bone resorption and inhibits bone growth

Cortisol is also released during strength training, though.

Seems like a real issue is low impact cardio, which isn't negative for bone density (as far as I can tell) but does have a theoretical opportunity cost when you could be doing weight-bearing cardio, which does improve bone density.

Agreed with littlestymaar's comment higher up, though, that exercise rates being what they are, the theoretical opportunity cost may be quite theoretical.

[hprotagonist]

> Cortisol is also released during strength training, though.

more than compensated for by the compressive loading signals from lifting heavy.

[ambicapter]

How do compressive loading signals compensate for cortisol production? Seems like one is a nerve signal and the other is a hormone?

[digdugdirk]

The previous post was referring to the overall bone density change. The skeletal loading from strength training is a stronger signal for bone density increase vs the negative impact on bone density from increased cortisol production.