MODEL RELEASED. Heart fitness test. Doctor showing a man the results of his heart fitness test. The man is wearing chest electrodes and an arm cuff, and is sitting on an exercise bike. The electrodes monitor the electrical activity of his beating heart. The arm cuff is part of equipment used to measure his blood pressure, an important indicator of health. Changes in the measurements, as the man exercises, allow an assessment of his cardiovascular fitness. Disorders like arrhythmia (irregular heartbeat), and some forms of coronary artery disease, can be diagnosed from the test.