This test measures the performance and capacity of the heart and blood vessels in response to increasing workload (exercise). Testing consists of walking on a treadmill, the speed and gradient of which are increased every three minutes. An Echocardiogram (an ultrasound of your heart) will be taken immediately before and after the exercise period to see how your heart responds to stress. A trained technician will place a special probe on various parts of the chest wall to take a series of images and videos the heart from different directions.