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1. Why does a high (a-v)O2 difference relate to a high VO2 max? 2. Why do...

1. Why does a high (a-v)O2 difference relate to a high VO2 max?

2. Why do elite athletes have a high VO2 max in regards to stroke volume?

Science   Anatomy-And-Physiology   
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Answer #1

The arteriovenous oxygen difference or a-v O2 is the difference in oxygen content of blood between arterial blood and venous blood.It shows or indicates how much oxygen is removed from blood in capillaries as blood circulates in the body.The a-v O2 and cardiac output is related by Ficks principle

VO2=Q * a-vO2 difference

=Heart rate*Stroke volume*a-v O2 difference

A athlete with higher VO@2 max has a greater ability to absorb ,transport and use oxygen during exercise.In this way an athlete with high VO2max will have efficient cardiovascular system that can absorob and transport large amounts of oxygen around their body.Their resting heart rate is less so stroke volume is more to compensate it as per Ficks formula we have written above.

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