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8 Cards in this Set
- Front
- Back
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what are three common misconceptions in terms of metabolic response to exercise?
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anaerobic metabolism results in an oxygen debt
lactic acid is a dead end metabolite lactic acid elecation is due to oxygen insufficiency |
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what is steady state exercise?
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steady rate of O2 consumption - submaximal and constant VO2 and blood LA
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what is EPOC?
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excess post-exercise oxygen consumption, not caused by lactic acid
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what is the metabolic fate of lactic acid after exercise?
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mainly oxidized, less than 20% converted to glycogen (mostly in white fibers), significant efflux for removal at other sites including liver
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what are theories offered to explain EPOC?
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elevated tissue temperature as heat is a major byproduct of ATP production
extra fatty acidy oxidation norepinephrine increases NA/K permeability and pump activity electrolyte disturbances, thyorid hormones and glucocorticoids |
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what is the anaerobic threshold?
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inflection point in blood lactate curve which was mistakenly labeled in support of theory of oxygen insufficiency linked with lactate production
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why is anaerobic threshold a misnomer?
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it is simply a balance between La entry and removal from circulation
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how did McCardle's syndrome studies prove the fallacy of anaerobic threshold?
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found that patients couldn't catabolize glycogen to form lactic acid
demonstrates anaerobic threshold at same point on curve even though no lactic acid rise is observed |
