Much of the advice on this subject and others related to high mileage suggest a long period (10 wks+?) of base building. Say for me, working up to 90 mpw, but with all steady/slow runs, again for me 7:00 mpm or slower. With the lack of my usual interval and tempo runs can I expect an initial decrease on my 5K, 10K times if I was to race during the base building?