With stationary cycling, you are really working out against the resistance of the machine - your body weight is largely irrelevant.
Most people burn between 6 and 10 calories per minute exercising, with 6 being on the moderate end, and 10 on the more vigorous end.
For an under-desk cycle, where you are likely concentrating on something else, probably about 5-6 calories per minute is a reasonable figure.
I agree with Dragonchilde - sweating is more an indicator of the environmental conditions (temperature, humidity, air movement, clothing, etc) than workout intensity. Heart rate and breathing are better indicators.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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