700 kcals is on the extreme high end for an hour of cycling. You'd have to be fairly heavy already and pushing it as hard as you can go. A normal person putting in average effect is probably more like 250-300 kcal.
I weigh 145. 700 kcals is about "tempo" effort: hard, but still fun-hard. All out, in the best shape of my life for one hour is around 900 kcals. I'm in good, but not phenomenal shape; my brief flirtations with road racing ended in utter humiliation.
I know this because of my on-bike power meter, which measures mechanical work in kJ. That "perfect hour" was around 280 W, and I've done it twice. (Cyclists have a very narrow range of biological efficiencies, so you can just multiply mechanical by a constant to reckon metabolic work.)
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700 kcals is on the extreme high end for an hour of cycling. You'd have to be fairly heavy already and pushing it as hard as you can go. A normal person putting in average effect is probably more like 250-300 kcal.
I weigh 145. 700 kcals is about "tempo" effort: hard, but still fun-hard. All out, in the best shape of my life for one hour is around 900 kcals. I'm in good, but not phenomenal shape; my brief flirtations with road racing ended in utter humiliation.
I know this because of my on-bike power meter, which measures mechanical work in kJ. That "perfect hour" was around 280 W, and I've done it twice. (Cyclists have a very narrow range of biological efficiencies, so you can just multiply mechanical by a constant to reckon metabolic work.)