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. Throughout the test a doctor will be present and your pulse, blood pressure and electrocardiography will be monitored. The test will stop if there are any observations that concern the doctor, if you become tired or breathless or if you develop chest pain or other symptoms.