Each pound of fat contains 3500 food calories. When the body metabolizes food, 7

Question

Each pound of fat contains 3500 food calories. When the body metabolizes food, 78.5% of this energy goes to heat. Suppose you decide to run without stopping, an activity that produces 1190W of metabolic power for a typical person.

For how many hours must you run to burn up 1 lb of fat?

If you followed your planned exercise program, how much heat would your body produce when you burn up a pound of fat?

f you needed to get rid of all of this excess heat by evaporating water (i.e., sweating), how many liters would you need to evaporate? The heat of vaporization of water at body temperature is 2.42106J/kg .

Explanation / Answer

1lb = 3500 Kcal

= 3500*4.18 KJ

= 14630 KJ

only 21.5% converts to power

1190*t = 14630*1000

t = 3.415 hrs

heat produced = 0.785 *14630

= 11484 KJ

amount of water = 11484/2420

= 4.75 kg

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