In isometric exercise all are increased except :
Correct Answer: Systemic vascular resistance
Description: Systemic vascular resistance [Ref: Ganong 22/e, p 633-634; Website : - "Autonomic mechanisms in hemodynamic response to isometric exercise" given at above mentioned website quotes -"The cardiovascular response to sustained isometric exercise have been studied and well defined in volunteers. Characteristically modest increase in hea rate and cardiac output occur, while increases in systolic and diastolic aerial pressure are more pronounced. The relative increases in cardiac output and mean blood pressure are such that calculated systemic vascular resistance is unchanged."The systemic cardiovascular response to exercise depends on whether the muscle contractions are primarily isometric or primarily isotonic.CVS changes in isometric exercise :- Hea rate rises- Systolic and diastolic blood pressure rises sharply- Stroke volume changes relatively little.- Cardiac output increasesCVS changes in isotonic exercise- Hea rate rises- Stroke volume increases markedly- Peripheral resistance decreases d/t vasodilation in exercising muscle- Systolic b.p. rises only moderately, whereas diastolic pressure usually remains unchanged or falls.- Cardiac output increases
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