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Aerobic Fitness |
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Aerobic
exercise uses oxygen to produce most
of the body's energy needs. It also
brings into play a fairly complex
set of physiological events. |
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To provide enough energy-producing
oxygen to the muscles, the following
events occur:
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Greater
movement of air through the lungs. |
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Increased
movement of oxygen from the lungs
into |
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the blood
stream. |
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Increased
delivery of oxygen-laden blood to
the working |
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muscles
by the heart's accelerated pumping
action. |
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Regulation
of the blood vessel's size to distribute
blood |
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away
from inactive tissue to working muscle. |
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Greater
movement of oxygen from the blood
into the |
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muscle
tissue. |
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Accelerated
return of veinous blood to the heart.
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Correctly
performed aerobic exercise allows
the heart and vascular systems to
deliver more oxygen-rich blood to
the working muscles during exercise.
As a result, the muscles become stronger,
more defined, and can work longer
and harder |
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