Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
what are three common misconceptions in terms of metabolic response to exercise?
|
anaerobic metabolism results in an oxygen debt
lactic acid is a dead end metabolite lactic acid elecation is due to oxygen insufficiency |
|
what is steady state exercise?
|
steady rate of O2 consumption - submaximal and constant VO2 and blood LA
|
|
what is EPOC?
|
excess post-exercise oxygen consumption, not caused by lactic acid
|
|
what is the metabolic fate of lactic acid after exercise?
|
mainly oxidized, less than 20% converted to glycogen (mostly in white fibers), significant efflux for removal at other sites including liver
|
|
what are theories offered to explain EPOC?
|
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 |
|
what is the anaerobic threshold?
|
inflection point in blood lactate curve which was mistakenly labeled in support of theory of oxygen insufficiency linked with lactate production
|
|
why is anaerobic threshold a misnomer?
|
it is simply a balance between La entry and removal from circulation
|
|
how did McCardle's syndrome studies prove the fallacy of anaerobic threshold?
|
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 |