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Home > PDHPE > Core 2 - Factors Affecting Performance > How does the body respond to aerobic training? > How does the body respond to aerobic training?
Answers
- From -3 to -2 minutes (not long before
exercise begins), the heart rate will remain steady and
close to the resting level.
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From 0 to 1 minutes (when exercise has
begun), the heart rate will rise rapidly to help supply
working muscles with oxygen and to remove carbon dioxide
and other waste products from the muscles. As exercise
intensity increases, heart rate increases.
-
From 8 to 9 minutes, the heart rate
plateaus, as exercise has continued at a constant
intensity for a period of time and the body is able to
supply sufficient oxygen to the working muscles.
The heart rate (HR) will change only if the exercise intensity changes e.g. if it increases, the heart rate will increase, or if it decreases, the heart rate will fall. The heart rate will not plateau if the exercise is at an intensity that does not provide the working muscles with the oxygen they need. In this case, the heart rate will continue to rise until the oxygen needs are met or until fatigue causes exercise to cease.
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From 10 to +1 minutes the heart rate
falls rapidly, as exercise has just finished and therefore
the body does not have a high demand for oxygen.
-
From +4 to +5 minutes the heart rate is
slowly falling at this point and it does not return to
resting levels immediately. After exercise the body still
requires oxygen to help with the removal of waste
products, such as carbon dioxide and lactic acid, from
the muscles and for the rebuilding of ATP (the molecule
that provides energy for the contracting muscles). The
oxygen required following exercise is known as excess
post-exercise oxygen consumption (EPOC).
Note: There is also a higher body temperature than normal during and after exercise as the working muscles produce heat. As a result the heart rate may remain elevated to assist with the cooling of the body.
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