Question

any help would be greatly appreciated!

28. Extra credit, no penalty if wrong. My maximal HR is 140, my EDV is 170 ml, my ejection fraction is 70%, my hemoglobin is 15 gm%, my arterial saturation is 98%, my mixed venous saturation is 25%. I weigh 80 kg. What is my VO2max, in ml/min in ml/kg ? (10 points)

Answer 1

What is Vo2 Max?

In its simplest terms, one's Vo2 max is the measurement of their body's ability to consume oxygen. To be clear, this does not mean one's natural ability to consume oxygen, but a measurement of the different things that affect how the body takes in oxygen. For example, the number of red blood cells you have affects your Vo2 max measurement. In addition to this, other factors such as how your muscles react to distance running and how much blood your heart can pump in a minute may also affect your final Vo2 max reading. To learn your own Vo2 max measurement, there is a test you can take. This test is often conducted in a laboratory as a controlled environment is needed for pure results.

How Do You Calculate It?

To calculate your Vo2 max, you must first take the test mentioned above. The test is conducted as follows:

The patient is hooked up to a breathing mask while they simultaneously undergo a treadmill test. It should be noted that Vo2 max tests can be measured in different ways. For example, a cyclist would have their Vo2 max measured during a cycling test rather than a treadmill test. The main point is to get the heart rate up, which can be done either by running, jogging, walking, or cycling on a machine.

To accurately measure the Vo2 max, the test (treadmill or otherwise) becomes more and more difficult as time goes on. One's Vo2 max appears when their oxygen consumption red lines, or when they reach their limit. For runners, this point can come after they have reached their fastest pace. When it comes to the Vo2 max test, redlining means you are working extremely hard and your body is getting tired. Your heart rate is "maxed out," once again meaning that you have reached your limit. Once this limit is reached, the measurements begin.

To calculate your Vo2 max, a physiologist will utilize a formula that includes the rate of your oxygen consumption during the exercise as well as your body weight. The common formula is as follows:

Vo2 Max = maximum milliliters of oxygen consumed in 1 minute /body weight in kilograms

In addition to this formula, there is another alternative formula for calculating one's Vo2 max:

Vo2 Max = 15.3 x (MHR/RHR)

MHR = Maximum heart rate. This number is actually the number of beats over the number of minutes, or the number of beats in 20 seconds multiplied by 3.

RHR = Resting heart rate. The number is also found by dividing beats by minute or number of beats in 20 seconds multiplied by three.

For a more in-depth look at the formulas and calculations, read here. In short, your Vo2 max is the number that expresses just how much oxygen you consume when exercising your hardest. As far as the results of the test go, a score between 30 and 60 is considered average.

It is best to have a Vo2 max test conducted by a professional as you cannot get an accurate reading without measuring ventilation, oxygen, and carbon dioxide concentration of both inhaled and exhaled air. The factors cannot be measured on your own or by a friend - you need someone who knows what they are doing on a professional level. If you are in a pinch, however, you can also measure your Vo2 max by using past results from races, from doing a Balke Test, or a Beep Test. The different tests correspond to the type of exercise you usually do.

170*70/100 =119

119*20.1=2391.9