> 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.
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.
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.