A 40-year-old male patient comes to you during a routinely s…

A 40-year-old male patient comes to you during a routinely scheduled appointment. He has history of hypertension that is well-controlled with a calcium channel blocker, low salt diet and exercise. During your review of systems he complains of intermittent chest pain associated with shortness of breath. He tells you that this pain comes after heavy exercise, such as his weekly basketball game, and is relieved with rest. You order an ECG and it shows normal sinus rhythm with no ischemic changes. What is the next test that you will schedule?