... beat). 2. The oxygen carrying capacity of the blood (or the number of haemoglobin in the red blood cells) 3. The amount of muscle and its ability to use the oxygen supplied. In other words, to have a high VO2 max (and be better at sport), you need to have a big and efficient pump to deliver oxygen right blood to the muscles, and mitochondria rich muscles to use that oxygen and turn it into energy for exercise. Experiments have shown that the muscles can use much more oxygen than the heart can deliver to them. Long-term training can result in a 300% increase in the muscle's use of oxygen, but only a 15-25% increase in the amount of oxygen intake. In other words, it isn't how well the oxygen converts oxygen into energy, but how good the circulatory system is to deliver the oxygen that limits how well a person can exercise. The value ...

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