I have a question regarding ATP during exercise. It\'s kind of long so bear with
ID: 3511339 • Letter: I
Question
I have a question regarding ATP during exercise. It's kind of long so bear with me. So I understand that when you are exercising, your body first uses the small supply of ATP that it has, which can be stored in creatine phosphate, which I know only lasts 8-10 seconds. My question is what source of ATP comes next? I always thought oxidative phosphorlyation came next, and then after that gets depleted THEN your body undergoes anerobic glycolysis. My thought of that was challenged in a discussion board for Human Physiology today, and now I am not exactly sure.
This person said that your body uses the ATP it has stored first, like in creatine phosphate. She then said this is when anerobic glycolysis kicks in, which uses pyruvate and converts it to lactate, and it can do this without oxgen. After a short time span, lactate is built up and the process can no longer go forward because the environment has become too acidic. NOW is when she said oxidative phosphorylation kicks in. She said that it takes longer for glucose to be converted to acetyl CoA then go through the Krebs cycle and then be converted to electron carriers like NADH and FADH2, but once all this has taken place, NOW we produce a lot of ATP (30-32 per glucose). This sounds correct to me, but I wanted to get another opinion of it, and I really can't find anywhere online that explains it well. Thank you in advance!!!
Explanation / Answer
Answer-
When we started exercise the next 8–10 seconds, our muscles use creatine phosphate stores to provide ATP. Till the glycogen system (which doesn’t need any oxygen) kicks in. However we have different ways such as Using creatine phosphate, Using glycogen (no oxygen) Using aerobic respiration.
Using creatine phosphate is the major system used for short bursts (weightlifters or short distance sprinters) because it is fast but lasts for only 8–10 seconds. Using glycogen (no oxygen) this lasts for 1.3–1.6 minutes. Using aerobic respiration – This lasts for an unlimited time, so it’s the system used in endurance events in exercise.
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