You Are Examining a 12-Year-Old with Cystic Fibrosis

You are examining a 12-year-old with cystic fibrosis. His resting vitals are HR = 90 bpm; RR = 20 bpm; and SpO₂ = 98%. You start your exercise testing. As the test continues, the child is walking on the treadmill at 2.5 mph 2% grade for 5 min. His vital signs are as follows: HR = 120 bpm, RR = 22 bpm, SpO₂, 90%; and an RPE of 14. You would

A) continue the test with the same mph and grade.
B) increase the mph and grade.
C) decrease the grade but keep the mph the same.
D) stop the test and monitor vitals over the next few minutes.
E) stop the test and call a code.