CAPITAL SPORTS Durate Mode D'emploi page 37

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The cardio training phase is considered aerobic or anaerobic training
depending on the energy expenditure. These two types of training are defined
as follows:
Aerobic Training Zone
While you are in this zone, you are improving your cardiovascular system and
burning fat.
Despite an increased heart rate, deeper breathing and light sweating, the body
is not in a very stressed state, breathing is not significantly accelerated—you
could still talk to someone without going out of breath—and you feel that you
could sustain the physical exertion for a long time. It's similar to when you
briskly walk uphill.
The muscles and heart work more intensely than when the body is at rest and
can get most of their energy needs met via aerobic energy production, which
utilizes oxygen to facilitate energy production. At the same time, the anaerobic
production of energy is also active, but only to a small extent. The lactic acid
produced in this process can be broken down to produce energy. Most of your
training should be aerobic training.
If you continue to increase the intensity, you will eventually come to the
threshold where aerobic energy production is no longer able to increase its
output. At this point, there is a shift towards anaerobic energy production
being used to a greater extent. You are now doing anaerobic training.
Anaerobic Training
When in this zone, you are improving your performance and speed. When you
increase the intensity while in this zone, the training becomes much more
strenuous because of the rising lactate level in the body; you start sweating
more; your breathing gets faster; and after some time depending on your
fitness level, your muscles tire and you feel totally exhausted and that you can
no longer continue at this level of intensity.
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