Many marathon runners "hit the wall" around mile 20. What does this tell you about glycogen? a. There is not enough oxygen by mile to continue using glycogen. b. Oxidative phosphorylation of glycogen is too slow by mile 20. c. Glycogen stores are mostly depleted by mile 20. d. Exercise intensity is too high by mile 20 to be sustained by glycogen anymore.
Glycogen is the stored form of energy in many organisms, including animals, bacteria and fungi. Glucose is converted to a multibranched polysaccharide molecule, glycogen, which gets stored and can be used as energy source when required.
In humans, glycogen is stored in the liver and muscles. During exercise and other strenuous activities, the body has a higher requirement for energy. During these times, carbohydrates are first used as a source of energy and the stored glycogen is converted to glucose to be supplied to the body via the bloodstream.
In marathon runners, the glycogen is readily used to provide energy while running. But after running a distance of 18-20 miles, the glycogen stores in the liver and muscles get depleted. This leads to shutting down of the body due to lack of energy and is referred to as 'hitting the wall'. Due to this, it is advisable to consume carbohydrates during rigorous exercise.
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