When I participated in a triathlon training program a couple of years back, we had Heart Zone Training from Sally Edwards' book. I specifically liked that she had bike-specific references, such as indoor/outdoor workouts, VO2 Max, how cadence, resistance and body position make a difference, and intervals. There was also this test we took - 2 min at each 10 bpm level - which determined a more personal max HR. Worth a look!

~Angie