![]() ![]() Isometric exercise increases heart rate and CO without significant effects on vascular resistance. Isometric exercise does not involve body motion that may interfere with hemodynamic measurements and is feasible in a larger number of laboratories. The size of the involved muscle group is unimportant, provided that maximal voluntary contraction is maintained to increase oxygen demand during the isometric exercise period. ![]() Measurements of hemodynamic data and ventricular function are obtained during sustained handgrip at a predetermined range (30% to 50% provided that maximal contraction is maintained for 3 to 4 minutes. Isometric exercise (skeletal muscle contraction without shortening) also may be performed using a handgrip with a graded hand dynamometer. Kern, in The Cardiac Catheterization Handbook (Fifth Edition), 2011 Isometric Exercise
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