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Introduction to lung function study guide

Introduction to lung function study guide - Introduction to...

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Introduction to lung function study guide This module basically overviews lung volumes and capacities and breathing mechanics. This is the minimum knowledge you need to know. Here are some more specific questions 1. Why should we think in terms of VO 2 peak rather than VO 2max ? Due to a lack of a consistent plateau of VO2 at the end of a VO2 max test, it is probably better to think of VO2 at exhaustion as an indirect measure of maximum work rate the athlete is capable of achieving before being force to stop due to perceived fatigue. This allows us to compare athletes in different sports. Also, keep in mind that the best athlete does not necessarily have the highest VO2 max. 2. When you are faced with VO 2 and VCO 2 curves how do you identify lactate threshold? Lactate threshold is the point where the two curves cross. 3. When you have a ratio of VCO 2 : VO 2 greater than 1 what does this indicate? When the ratio is above 1 there is insufficient oxygen and pyruvate will backup. The lactate and hydrogen ions produced by anaerobic glycolysis are buffered by bicarbonate and this increases the amount of CO2 that is dumped into the blood stream. At this point VCO2 rises to a level higher than VO2. 4. When you are looking at your printout of VO 2 and VCO 2 what data points do you look for at lactate threshold? The RER (respiratory quotient) is 1. This is the point at which this athlete is beginning to convert some of the pyruvate to lactate + H+. This athlete’s LT is
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