Abstract
Effective baroreflex-mediated cardiac and vascular resistance responses are crucial for homeostatic blood pressure control. We investigated the impacts of age and sex on arterial blood pressure regulation during a standard supine Valsalva maneuver (40mmHg, 20s) in 46 healthy young and 25 healthy older adults. Noninvasive, continuous cardiovascular parameters were recorded. In older adults, cardiac output (older: -58.4±2.4%; young: -40.8±1.4%; p<0.001) and stroke volume (older: -63.6±2.6%; young: -48.7±1.9%; p<0.001) fell more than in young adults and was compensated by augmented vascular resistance responses (older: +189.8±17.6%; young: +105.8±6.7; p<0.001); heart rate responses were attenuated in older adults. Male and female responses were comparable in their respective age groups.
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