What causes blood lactate to increase at higher intensities of exercise?Question 5Select one:a.The phosphagen system has a high flux producing more lactateb.Greater type II muscle fiber recruitmentc.The heart does not use lactate as a substrate for ATP synthesis at high intensitiesd.Hepatic glucose output can no longer buffer lactate
Question
What causes blood lactate to increase at higher intensities of exercise?Question 5Select one:a.The phosphagen system has a high flux producing more lactateb.Greater type II muscle fiber recruitmentc.The heart does not use lactate as a substrate for ATP synthesis at high intensitiesd.Hepatic glucose output can no longer buffer lactate
Solution
The increase in blood lactate at higher intensities of exercise is primarily due to greater type II muscle fiber recruitment.
Here's a step-by-step explanation:
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During exercise, your body needs to produce energy (ATP) to support the physical activity. This energy can be produced through different metabolic pathways, including aerobic (with oxygen) and anaerobic (without oxygen) metabolism.
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At lower intensities of exercise, your body primarily uses aerobic metabolism, which does not produce lactate.
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However, as the intensity of exercise increases, your body needs to produce energy more quickly. This is when it starts to rely more on anaerobic metabolism, specifically the glycolytic pathway.
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The glycolytic pathway occurs in type II muscle fibers and results in the production of lactate.
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Therefore, the more you recruit type II muscle fibers (which happens at higher intensities of exercise), the more lactate you produce, leading to an increase in blood lactate levels.
So, the correct answer is b. Greater type II muscle fiber recruitment.
Similar Questions
Why is lactate produced during strenuous exercise? A. Laktaat maak die bloed suur (asidose) wat ensiem funksie bevorderLactate makes the blood acidic (acidosis) which promote enzyme function. B. Rooibloedselle werk harder tydens oefening en produseer dus meer laktaat.Red blood cells work harder during exercise and thus produce more lactate. C. Om die NADH wat ophoop, om te skakel na NAD sodat glikolise bly funksioneer.To convert the accumulating NADH to NAD so that glycolysis keeps functioning. D. Dis 'n produk van lipied katabolisme.It is a product of lipid catabolism.
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It's believed that by experiencing high intensity intervals that produce lactic acid in muscles, the body adapts and burns lactic acid more efficiently during exercise. How does this impact the athlete?
The increase in cardiac output that occurs during exercise is due to_________
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