Lina presents with a history of chronic heart failure, increased dyspnea and fatigue during daily activities. The physical therapist plans to implement an aerobic exercise program. Which of the following exercise protocols is MOST appropriate for this patient?

A) 70-85% of HRmax, 5 times per week, for 45-60 minutes

B) 50-60% of HRR, 3 times per week, for 20-40 minutes

C) 30-40% of HRmax, daily, for 10-15 minutes

D) 80-90% of HRR, 4 times per week, for 60 minutes

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