Originally posted by TNUTT
Here is a good program www.racingsmarter.com/training_chapter.htm.
I would not consider sources that make blanket statements such as:
"According to research authorities riding a bicycle burns only 40% the calories as that of jogging and running. This means that there is an increase in the time factor of 2.5 for bicycle workouts over jogging or running."
exactly gospel.
That certainly would require some references to "research authorities", since you can ride a bike at a level where it uses the same amount of calories as running just by varying speeds (ok, at the very top of the scale you can burn more calories (nowhere near by a factor of 2.5, though, more like 1.1) by running but that will definitely be anaerobic and can only be maintained for maybe 1 minute).
Also, make sure you know your heart rate thresholds. They can vary considerably from those that are in the charts(usually be age). My resting heart rate is 39, but my maximum heart rate is also only 179 (I'm 27, so the charts would show like 195 MHR and assume about 50-60 RHR). I'm not in great shape despite that freakish RHR, since my aerobic threshold is only 115, and most programs would assume more like 130. I was tested on an ergometer with the tubes and electrodes and all that by real medical pros so the figures are reasonably accurate.