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  #1  
Unread 05-03-2008, 12:01 PM
seyralu seyralu is offline
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Location: South of Italy
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Question Watt and MET

Hi, I'm new and I have a question that has been bodering me for some time.
It regards the method to use to calculate the energy expenditure on a stationary bike.
If I pedal with an output of 50 watts/min for an hour, considering a 25% efficiency, the net energy expenditure is 172 Kc/h . Now, I'm a woman of 33 years old 165 cm and around 54 Kg, so my BMR is roughly 1200 Kc/day, 50 Kc/h (Met 1), so adding it to 172 Kc/h that's 222 Kc/h. Dividing that for 50 Kc/h (Met 1) that gives me a Met value of 4.44.
Is that correct?
I ask because in the "compendium of the calorie cost of various physical activity" that lists the Met values, a 50 watts effort on a stationary bike is considered very light and is given a Met of 3. 100 watts is labelled light, but for me that's more than moderate (at that load my HR is about 150 beats per minute, which I wouldn't consider light ).
What should I do to estimate my energy expenditure? Should I consider the watts output or should I follow the compendium values?
Thanks
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Unread 05-03-2008, 12:30 PM
CZa CZa is offline
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If your heart rate is 150 at that intensity...wow.

I've seen bedridden smokers on cocaine that have a lower heart rate at that intensity.
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  #3  
Unread 05-03-2008, 01:43 PM
seyralu seyralu is offline
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Quote:
Originally Posted by CZa View Post
If your heart rate is 150 at that intensity...wow.

I've seen bedridden smokers on cocaine that have a lower heart rate at that intensity.
Well.... maybe I've exaggerated a bit, but I assure you, 100 watts isn't light for me.
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  #4  
Unread 05-03-2008, 04:31 PM
CZa CZa is offline
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Follow the watts output. METs are variable based on the individual.
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