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Now you are moving fast on the steep terrain, but you slow down a little because your muscles start to burn. This burning means that your body is trying to find other sources of energy. This is when the glycolytic pathway takes over. This pathway actually kicked in at the same time as the ATP-PCr system did, but it takes a bit of time and is much slower to regenerate ATP. The glycolytic pathway uses glycogen stored in the muscles, takes glucose from the blood, and uses glycerol from triglycerides to regenerate ATP and keep you moving uphill. For ATP to be regenerated, 10 chemical reactions must take place. As a result, by-products are created: pyruvate and NAD+. At this point, if you keep climbing, there are two possibilities for regenerating more ATP.

KEY TERMS FOR ENERGY PRODUCTION

There’s no need to memorize these terms, but use this list to better understand the processes of energy production in the body.

Acetyl-CoA:

Adenosine diphosphate (ADP):

Adenosine triphosphate (ATP):

ATP-PCr system: