Many marathon runners “hit the wall” around mile 20. What does this tell you about glycogen?Group of answer choicesGlycogen stores are mostly depleted by mile 20.Oxidative phosphorylation of glycogen is too slow by mile 20.Exercise intensity is too high by mile 20 to be sustained by glycogen anymore.There is not enough oxygen by mile to continue using glycogen.
Question
Many marathon runners “hit the wall” around mile 20. What does this tell you about glycogen?Group of answer choicesGlycogen stores are mostly depleted by mile 20.Oxidative phosphorylation of glycogen is too slow by mile 20.Exercise intensity is too high by mile 20 to be sustained by glycogen anymore.There is not enough oxygen by mile to continue using glycogen.
Solution
The phrase "hitting the wall" in marathon running is often used to describe a point where the runner suddenly feels fatigued and drained of energy. This typically happens around mile 20. This phenomenon is closely related to the body's glycogen stores.
Glycogen is a form of glucose stored in our muscles and liver, and it's the body's primary source of fuel during exercise. During a marathon, the body relies heavily on glycogen to keep going. However, these glycogen stores are finite.
The body can only store enough glycogen to fuel about 18-20 miles of running. Therefore, when a marathon runner "hits the wall," it's often because their glycogen stores are mostly depleted. This is why it's crucial for long-distance runners to manage their pace and fuel intake during a race to avoid depleting their glycogen stores too quickly.
So, the correct answer to your question is: "Glycogen stores are mostly depleted by mile 20."
Similar Questions
When marathon runners “hit the wall” around mile 20, ____________________ is the most likely explanation for the sudden onset of fatigue.Group of answer choicesPCr Depletionglycogen depletionPi Accumulation
Well trained individuals may utilise less glycogen/carbohydrate for performance. But in reality the fitter we are and the faster we want to go, we continue to push the intensity, as a result glycogen depletion is still a very real thing even for the most highly trained individuals, hence peak performance determined by the ability to utilise carbs and fats effectively.
Hitting the wall is when you deplete your stores of glycogen. We can store around 500-800g of carbohydrate stored as glycogen in the muscles and liver. 90-120 MINS
Muscle glycogen metabolism is disproportionally highGroup of answer choicesduring late exercisewhen exercise intensity is highwhen blood glucose levels are highwhen exercise intensity is low
The anaerobic glycolytic system would be the primary source of ATP for which running event?Group of answer choices100 m800 m (1/2 mi)3,200 m (2 mi)marathon
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