. Fitness test. Man walking on a treadmill during a fitness test. Electrodes attached to his chest measure his heartbeat, and how it responds to exercise. This is an important measure of cardiovascular fitness. Using this method, disorders such as arrhythmia (irregular heartbeat) and some other forms of coronary artery disease can be diagnosed. The blue cuff on his arm is measuring his blood pressure, which is another valuable indicator of health. The data are displayed on the screen at lower right. MODEL RELEASED

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