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One-second recordings of left ventricular pressure and its derivative, dP/dt, [calculation of velocity of myocardial contraction (dP/dt+) and calculation of velocity of myocardial relaxation (dP/dt−)] before (Control) and in response to beta-adrenergic receptor blockade (β-x) in intact (top) and T5 spinal cord transection (T5X; bottom) rats.
