Physiology of Exercise - Lactate increase

5 important questions on Physiology of Exercise - Lactate increase

At what percentage of VO2max starts lactate to increase?

Around 50-60% VO2max, with a range of 40-80%

What decreases faster if a person ages, VO2max or lactate threshold?

VO2max

Explain what the overload of the tricarboxylic acid cycle means.

There is more pyruvate synthesized than utilized, so more pyruvate is transformed in lactate
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How much needs the blood flow to be to obtain a PO2 of 15 mm Hg

6L blood for a O2 consumption of 1L/min

What happens with the saturation of hemoglobin when exercising above lactate threshold?

When exercising above lactate threshold the pH will decrease. When pH drops hemoglobin saturation decreases (Bohr effect). The decrease of [Hb]-saturation is not the effect of decreased PO2, since PO2 decreases in not different from exercising below the lactate threshold.

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