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Stroke Volume (SV) is the amount of blood pumped out the left ventricle of the heart after each contraction and is a measure of the efficiency of the heart. Knowing SV is important for both non-athletes and athletes, because as SV increases an individual's capacity for work increases as well. Several studies have shown little change in SV with incremental exercise. However, other research has shown that SV can change with increasing levels of exercise...