Through the use of technology, it's now possible to calculate the amount of fat utilized during a session.
The most accurate method is by direct air analysis, performed in a laboratory. This analyzes the air you inhale and exhale and looks at the difference in composition to determine the energy source you are using. However its cumbersome, expensive and impractical on an ongoing basis.
In the gym we can use a heart rate monitor to get much the same result.
By using special monitors, it's possible to determine both the amount of energy you've used in a session and the percentage of that energy that has been derived from fat sources.
Many people mistakenly believe that the harder they work the more fat they use. This is not neccessaily the case.
The harder you work the more energy you will use. However it's the amount of fat you use that is of concern here, and that is calculated by multiplying the energy used by the percentage of that energy derived from fat.
From our example. there was a 41% difference in the amount of fat used.
But from the example, the session that used less energy used the most fat!
Remember, in calculating fat use, it's not the total amount of energy used, but the product (multiplication) of energy used and the amount derived from fat sources.
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Regards Kym
