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• W2013979448 abstract "Sympathetically mediated renal vasoconstriction may contribute to the pathogenesis of hypertension in older adults, but empirical data in support of this concept are lacking. In 10 young (26 ± 1 yr) and 11 older (67 ± 2 yr) subjects, we quantified acute hemodynamic responses to three sympathoexcitatory stimuli: local cooling of the forehead, cold pressor test (CPT), and voluntary apnea. We hypothesized that all stimuli would increase mean arterial blood pressure (MAP) and renal vascular resistance index (RVRI) and that aging would augment these effects. Beat-by-beat MAP, heart rate (HR), and renal blood flow velocity (from Doppler) were measured in the supine posture, and changes from baseline were compared between groups. In response to 1°C forehead cooling, aging was associated with an augmented MAP (20 ± 3 vs. 6 ± 2 mmHg) and RVRI (35 ± 6 vs. 16 ± 9%) but not HR. In older adults, there was a positive correlation between the cold-induced pressor response and forehead pain (R = 0.726), but this effect was not observed in young subjects. The CPT raised RVRI in both young (56 ± 13%) and older (45 ± 8%) subjects, but this was not different between groups. Relative to baseline, end-expiratory apnea increased RVRI to a similar extent in both young (46 ± 14%) and older (41 ± 9%) subjects. During sympathetic activation, renal vasoconstriction occurred in both groups. Forehead cooling caused an augmented pressor response in older adults that was related to pain perception." @default.
• W2013979448 created "2016-06-24" @default.
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• W2013979448 creator A5049371212 @default.
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• W2013979448 date "2013-07-01" @default.
• W2013979448 modified "2023-10-02" @default.
• W2013979448 title "Effect of healthy aging on renal vascular responses to local cooling and apnea" @default.
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• W2013979448 doi "https://doi.org/10.1152/japplphysiol.00089.2013" @default.
• W2013979448 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3727011" @default.
• W2013979448 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23640587" @default.
• W2013979448 hasPublicationYear "2013" @default.
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