<prompt> In isometric exercise, all are increased exceptHea rateCardiac outputMean aerial pressureSystemic vascular resistance  <response>: In normal individuals the increase in blood pressure is mediated by a rise in cardiac output with little or no change in systemic vascular resistance. With the sta of an isometric muscle contraction, the hea rate rises, probably as a result of psychic stimuli acting on the medulla oblongata. The increase is largely due to decreased vagal tone, although increased discharge of the cardiac sympathetic nerves plays some roleStroke volume remains almost the same, but given that hea rate increases cardiac output increasesCOPstroke volumehea rateWithin a few seconds of the onset of an isometric muscle contraction, systolic and diastolic blood pressures rise sharply which increase Mean Aerial PressureRef: Ganongs Review of Medical Physiology Twenty-Third Edition Page No: 518 