Thanks to those replies that stayed on focus. My goals are to improve endurance and climbing which I think are fairly compatible. I use my heartrate monitor for all my workouts and focus on the intensity/heartrate targets.

My original question came from my need to vary track workouts to avoid injuries. It was hard to adjust to lower reps even when the results supported it. I've always been one to do 100% of the workout because that's what was written. Cycling as a replacement pursuit has given me a wiser approach to training, but I'm still looking to maximize my results. Cycling also seems to lack the violent onset of injuries like running, but I am concerned about staying ahead of overuse injuries.

That said, Allegheny Jet points out the need for the cumulative duration of the intensity of the workout to be compatible to the demands of the event. That's always made sense to me. Thanks again and ride safe.