cardiac output vs VO2 max?

Cardiac output is the main determining factor of your VO2max.

Per the fick equation

VO2 max equals cardiac output times a-vO2 difference.

Of the two factors that determine VO2max, Cardiac Output is the more important of the two.

oh you learnt a new word in class today, good job.

eddylee wrote:

Is cardiac output and V02 max related? we talked about cardiac ouput in my human physiology class today, but he did not mention V02 max. i was just wondering because cardiac output might have something to do with vo2 max or vise versa.

When I took anatomy and physiology we never discussed exercise (well, not in any kind of depth) so I am not surprised that it would not be mentioned.

can some1 please explain to me what v02 max is? i believe that v02 max is the bodys ability to distribute O2 throughout the body, and cardiac output is the bodys ability to distribute blood throughout the body. im not really sure...i had class about an hour ago. anyways...if u have a high cardiac output of blood(which carries O2) to different muscles...then u would have a high VO2 max because the O2 is already there. shoot i think i just sounded like a retard...so dont make fun...just a po' college frosh.

cardiac output refers to the amount of blood that your heart muscle (cardiac muscle) is pumping out (usually specified in liters per minute). That is one factor in how much oxygen you are delivering, because, of course, the blood is carrying the oxygen. The other important factor is oxygen carrying capacity of the blood -- how much oxygen is your blood carrying per unit of blood -- typically expressed in ml of oxygen per 100 ml of blood or per liter of blood. The amount of oxygen your blood is carrying is a function of how much hemoglobin you have in your blood and the pressure of oxygen (PO2) in the arteries that are delivering the blood. Each gram of hemoglobin can carry 1.34ml of oxygen, if fully saturated (as it pretty closely is at sea level), so if you have aa hemoglobin count of 15 this means you can carry about 20 (15X1.34)ml oxygen per 100 ml blood or 200 ml per 1 liter of blood. Since you are only about 97% saturated the numbers become about 19 or 190. Then if you can pump 20 liters per minute (20-liter cardiac output), you can deliver 3800ml oxygen per minute -- 190 per liter X 20 liters. Obviously if you reach a cardiac output of 30 liter per minute then you could deliver 5700ml O2 per minute. Also, if you have less hemoglobin, or at altitude where the hemoglobin is not as saturated with oxygen, then you will deliver the same amount of blood but less oxygen. Anyway VO2max depends on how much oxygen you can deliver (the central factor) and at the exercising muscle, how much of the delivered oxygen can the muscle use per minute to convert fuel into energy (the peripheral factor). Blood doping studies suggest that the central factor is the limiting one since blood doping increases the central factor, which also increases the VO2max (suggesting that the cells could handle more if it could be delivered -- but VO2max does not go up as much as does the delivery factor so there is probably some limit at the peripheral end as well. Live it up

eddylee wrote:

Is cardiac output and V02 max related? we talked about cardiac ouput in my human physiology class today, but he did not mention V02 max. i was just wondering because cardiac output might have something to do with vo2 max or vise versa.

Please tell me you're in high school? If so then I give you a free pass. If this is a college course you're talking about then shame on your instructor.

Vo2 = cardiac output x AVo2 difference....

Cardiac output = HR x stroke volume

Stroke volume: Determined by size and strength of heart muscle tissue.

AVo2 difference = Measures how much oxygen is taken up by the muscles. The difference in arterial vs venus blood oxygen content. Blood comes to the muscles via arteries. # of capillaries and mitochondira is the main determining factor how much oxygen is taken up by the muscles. Capillaries take the blood deep into the muscle and across more muscle. Oxygen is then "dropped off" at the mitochondria IF it is needed. More mitochondria, more need.

The more changeable factor here is the AVo2 difference.

Please tell me you're in high school? If so then I give you a free pass. If this is a college course you're talking about then shame on your instructor.[/quote]

hahaha nah im in college, but only a frosh. we just learned about cardiac output and i havent read the chapter yet...so yah thats prolly why i seem pretty lame on the subject. hey but thanks for the clarification.

bump? hahaha sorry i just wanna gather info so i can bring it to class and ask the professor his insight on this matter.