Body fat is metabolized, supplying 9.30 kcal/g, when dietary intake is less than

Question

Body fat is metabolized, supplying 9.30 kcal/g, when dietary intake is less than needed. The manufacturers of an exercise bicycle claim that you can lose 1.0 lb of fat per day by vigorously exercising for 2.0 h per day on their machine. [average energy consumption in cycling (at 21 km/h) is 10.0 kcal/min, or 700 W; oxygen consumption is 2.0 liters per min.] (a) How many kcal are supplied by the metabolization of 1.00 lb of fat? (b) Calculate the kcal/min that you would have to utilize to metabolize fat at the rate of 1.0 lb in 2.0 h. (c) What is unreasonable about the results? (d) Which premise is unreasonable, or which premises are inconsistent?

Explanation / Answer

elergy released in 1 pound fat,
= 453.592*9.30 Kcal
= 4218.4056 Kcal
rate = 4218.4056/2*60 Kcal/min
= 35.15 Kcal/min
but by cycling at maximum we can burn 10 kcal/min so manufactures claim is false

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