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For Joggers
Why Jog?
Jogging, or easy aerobic running, has been evaluated
in Sports Medicine Institutes throughout the world, and found to be the best way
to exercise - - next to cross country skiing - - to develop general cardiac efficiency.
By developing the under-developed blood vascular or circulatory
system to gather in and transport more oxygen to the various parts of the body, jogging
eases pressure on the heart.
During strenuous exercise, the heart can pump about 34 liters of blood per minute.
When running easily, the heart is still pumping several
liters of blood per minute and this is sufficient to develop the under-developed
circulatory system--the smaller arteries, artioles,
capillary beds and veins. This means that the build up of blood in the aorta is lessened
and the blood can circulate back to the heart more quickly, so easing pressure on
the heart.
A greater flow of blood is pumped to the lungs
as the arteries in the respiratory system develop larger channels, and this in turn
improves the possibility of the gathering in more oxygen per minute than previously. Everyone breathes in a lot of oxygen,
but much of this is breathed out because it is not able to be absorbed.
It is also agreed that better blood tone usually results though exercise, increasing
the quality and quantity of red blood cells.
Through the increased oxygen intake per minute
and improved circulation, the heart's workload eases. This is the first stage in
trying to improve a person's cardiac efficiency and in eliminating the possibility
of heart failure.
Starting Out
As general efficiency is acquired, it is possible to progressively increase the
workloads with safety, running at faster speeds and for longer distances.
But it is wise to run easily for several months until some reasonable development
has resulted.
Everyone has a certain ability to absorb, transport, and utilize oxygen and when
the exercise calls for the individual's maximum use, it is termed the Steady State.
This ability can be improved with regular aerobic exercise -- aerobic meaning
"with oxygen". When the exercise requires more oxygen than the person can
take in, it becomes an aerobic exercise, the metabolism has to compensate, resulting
in the formation of lactic acid in the blood stream and eventually causing the person
to stop exercising through the neuro-muscular breakdown.
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