SIGMA ONYX PRO - Manual (Page 95)

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7.2 IAT AND MEASURING LACTATE (advantages, background)
Information on IAT
The anaerobic threshold is very important for training efficiency
as important performance parameters can be determined with
reference to this value (% above and below IAT). Depending on
the level of load the body takes the energy required from various
sources. We can differentiate between three situations relating
to the anaerobic threshold:
k For loads below the anaerobic threshold the energy is
primarily provided by converting oxygen, i.e. “aerobically”.
It is possible to maintain endurance for a very long time,
e.g. for a marathon race.
k Loads on the anaerobic threshold are relatively high to be
maintained over a long period of time (the glycogen reserves
are virtually exhausted after 60 to 90 minutes depending on
the training stated at high intensity).
k Loads above the anaerobic threshold are handled primarily by
providing energy “anaerobically”. The lactate increases and
this can adversely affect performance so that it is only possible
to maintain the performance for a short period of time
(a few minutes).