I've been off running and physical activity for two years. I've just started riding again with my kid in the Burley. I figure it's been about six weeks of riding and three with a HRM. My question is are all bases the same? I run about 40 minutes twice a week and go at about 6mph. I currently ride about 1:15 five times a week at 70-80%, which with a kid and a mountain bike averages about 12mph. Not like all that has anything to do with my question but, do I have to build my base one at a time or is a base a base no matter what sport you're in?
from the reading that I've done, I would have to say that they have some specificity to them. That being said, as you gain a base in one it may not take as long to get a good base in another. I would say if you feel ready test the waters and see what happens. If it takes a long time to recover from the higher effort stuff then you need to back off some more, otherwise keep at it.