Question

Does the importance of regional vasoconstriction on VO2 max increase or decrease if an individual has a very high absolute CO? (fick equation may be useful here)

Answer 1

Ans) VO2 = Q x A-VO2 diff

The Fick equation (or VO2 max formula).

- The Fick equation is used to determine the rate at which oxygen is being used during physical activity.

- The principle behind the Fick equation is the foundation to a lot of what we are learning.

- The Fick equation determines the rate at which a person uses oxygen in their body – which is also known as VO2 (the volume of oxygen uptake).

- Maximum VO2 is the greatest amount of oxygen you can take in and utilize, and is a value that can be influenced by genetics and training.

- Maximal VO2 is typically used to measure how aerobically fit an individual is. The greater the VO2 max value, the more efficient the individual is at getting oxygen to their tissues and getting their tissues to utilize that oxygen.

- As fitness professionals, we usually talk about max VO2 it in relation to maximal exercise or maximal exercise testing.

- The VO2 of the skeletal muscles is not enhanced by vasoconstriction at near-maximal or maximal exercise in humans.

- The fact that ATP infusion resulted in a reduction of O2 extraction across the exercising area suggests a vasodilating effect of ATP on less-active muscle fibers and other noncontracting tissues and that under normal conditions these regions are under high vasoconstrictor influence to ensure the most efficient flow distribution of the available cardiac output to the most active muscle fibers of the exercising area.