What is exactly stamina? What happens when it gets trained? Do your lungs get better and more efficient at pumping air?
In: Biology
Increased stroke volume, like other commenters have mentioned it has to do with the heart. Stroke volume is how much blood is pumped by the heart with each beat.
This is the same reason why athletes who are in excellent physical condition have an (on average) a lower heart rate at rest. Your heart doesn’t need to beat as many times to pump oxygen to your muscles because it’s able to pump larger amounts of blood with each contraction.
On a tangent related to stamina, a stronger heart doesn’t prevent a person from becoming tired but it does impact how fast one recovers from being tired, aka stamina.
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