While assessing a patient's expired gases at rest prior to exercise, a pulmonary function technologist calculates the RER as 0.6. Which of the following is the most likely explanation?

A patient has normal pulmonary and cardiac function. Which of the following is most likely when the patient reaches the anaerobic threshold during incremental stress testing?

A polarographic oxygen analyzer used to measure expired gas in a metabolic system should always be calibrated with

At maximum exercise, a 24-year-old patient's heart rate is 150/min with a VO2 of 750 mUmin. The calculated
02 pulse is most consistent with which of the following?

Successive peak flow measurements made with a peak flowmeter on a subject previously diagnosed as having asthma yield the following results:

Which of the following is the best explanation for these?