hi mac,
there is a high possibility that your tendons need some rest. Maybe that's why they are sore. Once a tendon become sore, it releases inflamatory chemicals for warmth and this can cause pain in the affected region. SO take rest,
regards
Rest will not only the solution, kindly suggest, which thing make tendon powerful?
Is the pain under your knee cap or tendon? From what you are saying it sounds like your saying under your knee cap.
You could have patellofemoral syndrome; very common for cyclists (read your bio). Try this website.
http://www.med.umich.edu/1libr/sma/sma_patellod_sma.htm