Let us explain in such a way that you sometimes heard that there is a certain activity of 4 METs. What does that mean?
If you are in a state of rest and lie down, you consume a certain amount of energy and oxygen. We call this amount of oxygen that you need at rest 1 MET. Now, if you have an activity that requires 4 times more oxygen than the resting state, that means it requires 4 times more energy, and we call it a 4 MET activity. The rest is calculated in the same way.
Now, if you want to consider an activity for people, you can use MET to determine how intense it is. That is if you have three activities that are 1.5 MET, 5 MET, and 7.5 MET respectively, it means that the intensity of the first is very low, the second is medium and the third is high.
I think the application of practical science was explained. But you may ask how these are recognized. These are calculated in advance by scientists using a Gas Analyzer device, which is too much to explain.
You can find different activities by searching on Google Mate.
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