Francisco d'Anconia said:
I can sit in a spin class for an hour on a stationary bike and burn 600+ calories, actually riding on the road you can burn more. You're saying you can do better than that by running? You think that is common sense? There must not be much science behind your logic.
That's exactly what I'm saying. It depends on the effort you put forth but, yes, with EQUIVALENT effort you will expend more calories per hour running.
For example, you burn approx. 110 calories per mile running, regardless of the speed you run it. So, let's just say (to use your example) you were to run for an hour at a slow pace of 10 minutes per mile or 6 mph. 6 miles x 110 = 660. If you want to equate more energy used riding on the road, then be sure to increase the energy used in running; but the effect is the same -- for EQUIVALENT efforts, running burns more calories.
A quick google search will net you tons of charts that show this, here's one:
http://72.14.203.104/search?q=cache...ies+expended+running&hl=en&gl=us&ct=clnk&cd=9
Another common sense example on why swimming expends more energy (calories) than running expends more calories than cycling: why is it that in a triathlon, the swim is 2.4 miles, the bike 112 miles, and the run 26.2 miles? Could it be that swimming just plain uses more energy? Not many people can SWIM for 2 hours and there are many people who can bike for two hours. Try to swim an hour using the same effort as biking an hour and see which one has you gasping faster. Same with running. So, for the same TIME or DISTANCE, you'll expend more calories 1. swimming 2. running, 3. cycling, in that order.
But, it doesn't matter -- do SOMETHING. If you only have an hour, then your most effective caloric burn will be from swimming, running, biking, in that order. Any of these are better than nothing. And, running does cause more wear on your body, but that's not what you asked.