When you measure the amount of work that you do when exercising the value most often cited is heart rate. The amount of blood that your body pumps through the circulatory system as a response to stresses. If we buy into the fat turns into CO2 theory, then wouldn’t it be more accurate to chart respiration instead of heart rate, since respiration is directly correlated to CO2 transpiration?

Here are some numbers: Mr. J. Blow, our model model, has a resting respiration rate of 12 times a minute and in that minute exhales .6 grams of CO2, or .05 grams per breath. Any activity that increases his respiration should have a corresponding increase in CO2 emission. Lets say that Joe goes for a long run in the morning, say an hour, and during his run sustains a ventilation rate of 30 breaths per minute. 18 extra breaths a minute for 60 minutes times .05 grams comes to 54 grams of CO2. For the body to turn 1.1 kg. of fat into energy you would have to inhale 2.9 kg. of O2, producing 2.8 kg. of CO2 and 1.1 kg. of water. Using this math, our model’s little jog burned up 18.6 grams of body fat, evidence of why consistence and dedication is so important to staying healthy. This is in addition to the roughly 300 grams of fat the body uses each day to maintain base metabolism, interesting to say the least.