A professional athlete, 28, takes part in a sports physiology study. She runs at a gradually increasing speed on a treadmill. Her pulse is 90 percent of her maximum heart rate based on her age after 15 minutes, and several physiologic parameters are measured. Which of the following changes have most likely occurred compared to at rest?

Question

A professional athlete, 28, takes part in a sports physiology study. She runs at a gradually increasing speed on a treadmill. Her pulse is 90 percent of her maximum heart rate based on her age after 15 minutes, and several physiologic parameters are measured.   Which of the following changes have most likely occurred compared to at rest?

Quizplus · Accepted Answer

Eductional Objective: Exercise causes physiologic changes in the respiratory system such as increased minute ventilation (via an increase in both respiratory rate and tidal volume), decreased physiologic dead space, increased ventilation-perfusion ratio, and increased oxygen extraction by skeletal muscle (resulting in decreased mixed venous oxygen content).

A Professional Athlete, 28, Takes Part in a Sports Physiology