Originally Posted by
terrymorse
I think the research suggests that mitochondria content (number of mitochondria in muscle) is increased by the volume of exercise, which mitochondria function (ability to take in oxygen) is affected by the intensity of exercise. Both are beneficial.
So long rides promote the growth of mitochondria, and hard rides promote the ability of that mitochondria to do their job supplying energy to the muscles.
Thanks Terry! Takes me a while to glom onto a discussion sometimes, but thanks for that clarification!