What is regulating the rate of muscle glycogenolysis

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Reference no: EM133231703

Question: An athlete is training for track season as a competitive sprinter. They are performing sprints along level ground at maximal effort/speed. They can only sprint for about 30-90 seconds at this intensity before the must stop and recover.

A) This effort takes approximately 30-90sec. What would the primary energy substrate for this activity be, and from where will it be derived (what storage site)?

B) Imagine inside the muscle cell in the situation above. There is likely a high NADH:NAD ratio in the cytoplasm. How will this affect the fate of pyruvate? (ie, what will likely happen to a pyruvate that has been generated via glycolysis?), and why?

C) What is regulating the rate of muscle glycogenolysis?

D) As the athlete continues performing repeated sprints with little rest between, what will happen to blood lactate concentrations, AND how does this impact (interact) with the hormonal regulation/mobilization of energy substrates?

E) In the initial 5-10 seconds of each sprint, the phosphagen (ATP-PC) system is able to provide ATP to the muscles. This system is replenished during the rapid phase of EPOC.

What is the rate limiting enzyme of this system?

Reference no: EM133231703

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