During exercise, the point at which increased levels of lactic acid production result in an in-creased VCO2 and VE is referred to as what?
a. Respiratory quotient (RQ)
b. Ventilatory threshold
c. Crossover point
d. Exercise limit
ANS: B
As excess lactic acid is buffered, CO2 levels rise and the stimulus to breathe increases. The result is an abrupt upswing in both CO2 and VE (referred to as the ventilatory threshold, or VT).
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