Physiology of Exercise - The anaerobic threshold concept

4 important questions on Physiology of Exercise - The anaerobic threshold concept

What is the anaerobic threshold?

It is the point which represents the demarcation of O2-independent flow and O2-dependent flow. (O2 <-> work rate)

What is the isocapnic buffering period?

The period in which Ve and VCO2 increase at the same rate, without an increase in Ve/VCO2

What happens with the pETCO2 when Ve increases relative to VCO2? What effect does this have on ventilatory drive?

The end tidal CO2 decreases, so less CO2 is released after expiration. Because the CO2 is not sufficiently reduced, H+ increases and stimulates carotic bodies to increase ventilatory drive. In this way pCO2 is reduced again.
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Where lies the difference between AT, LT and LAT?

The differences are in the method of measurement.
AT = when ~P's are produced anaerobically
LT = is when there is a net gain of lactate in the arterial blood
LAT = when the body show a decrease in HCO3 - and an increase in VCO2

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