Atrial fibrillation (AFib) is a medical disorder that affects the upper chambers, known as atria, of the heart. People with AFib experience irregular heartbeats caused by abnormal electrical signals in the atria. The electrical impulses erroneously circulate through the atria, causing the atria to contract with an irregular rhythm and fast rate. Different areas of your heart may beat too quickly, too slowly, or in an uneven rhythm in response to the AFib. When the lower chambers, known as ventricles, of the heart beat too quickly during AFib, this is known as AFib with a rapid ventricular response. Many people who have paroxysmal AFib experience transient episodes brought on by a specific trigger. Recognizing triggers and avoiding them can help you manage AFib effectively. metformin use in pregnancy Exercise testing elicits the body's reaction to measured increases in acute exercise. The changes in heart rate,blood pressure,respiration,and perceived level of exercise provide data that permit quantitative estimation of cardiovascular conditioning and function. Exercise tests provide an opportunity to observe a personduring exercise. By monitoring heart rate and blood pressure and continually observing the ECG, one can detect changes in the hemodynamic response and ischemic type ECG ST segment depression, and can detect and classify disturbances in heart rhythm and conduction associated with exercise. Exercise can elicit cardiovascular abnormalities not present at rest and can be used to assess function of the cardiovascular system. Isotonic (dynamic) exercise, defined as muscular contraction of large muscle groups resulting in movement, primarily provides a volume load to the left ventricle, and thecardiovascular response is proportional to the degree of the exercise. When dynamic exercise begins, oxygen uptake by the lungs quickly increases. 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