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the characteristic baroreceptor reflex (BR) are significant factors influencing +G z tolerance. 7 When the baroreceptors register a decrease in blood pressure, the sympathetic nervous system (vasoconstrictor response) is activated. Activation of the sympathetic nervous system results in an increase in heart rate (HR), cardiac contractility, and overall vasoconstriction, leading to increased peripheral resistance. The BR is a compensatory mechanism and should maintain pressure at the head level during the +G z exposure. However, the BR takes time to activate so