Q3 - Training Effects on Lung Ventilation and Hyperventilation

Theoretical B Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license

Lung ventilation (or minute ventilation, V) at increasing workload (oxygen uptake) was measured for two men. Person 1 (black) was untrained, and his V was measured before and after a few weeks of training. His body weight before and after intensive training was 70 kg and 75 kg, respectively. Person 2 (red) weighed 70 kg and was well trained. His V as a function of work was measured only once (Fig.).

Lung ventilation V (atmospheric air L/min) as a function of total maximum oxygen uptake (L/min) for person 1 before training (black) and after training (blue dashed), and for person 2 (red dotted).

Figure 1. Figure 1.

Using the information and data, determine which of the statements are true or which are false.

A. After training, person 1 has improved his VO₂max (i.e. max. oxygen uptake/L/min/kg body weight) about 30% (±5%)

B. Training by person 1 affected both start and extent of hyperventilation

C. Further training is expected to increase person 1's anaerobic endurance significantly

D. A very high V is mainly achieved by an increase in breathing frequency and not depth of breathing

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Question reproduced from IBO 2015, Theoretical Exam B, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)