Table 1_Age-related hearing loss in healthy older adults is associated with arterial stiffening and higher aortic systolic blood pressure: potential role of inflammation.docx

Age-related aortic stiffening increases aortic (central) blood pressure and flow pulsatility, resulting in microvascular dysfunction and target organ damage. The relationship between aortic stiffness, aortic blood pressure, and age-related hearing loss has not been fully determined. We hypothesize that aortic stiffness and aortic blood pressure will be associated with hearing loss and attenuated by inflammatory biomarkers [matrix metalloproteinase-2 (MMP-2), resistin, and vaspin]. Twenty-two younger (n = 11, 4M/7F, age 25.5 ± 2.1 years) and older (n = 11, 4M/7F, age 65.8 ± 0.9 years) adults completed resting measures of aortic stiffness (carotid–femoral pulse wave velocity, cfPWV), pulse wave analysis, and hearing sensitivity. Compared to young adults, older adults had higher cfPWV, aortic systolic blood pressure (aSBP), speech recognition thresholds (SRT), and pure tone averages (PTA) in the low (LFPTA) and high frequency (HFPTA) domains (all, p < 0.05). cfPWV was correlated with right ear (RE) LFPTA (r = 0.45, p = 0.04) and HFPTA (r = 0.53, p = 0.01) and left ear (LE) HFPTA (r = 0.52, p = 0.02). aSBP was correlated with RE SRT (r = 0.47, p = 0.03), LE SRT (r = 0.44, p = 0.04), RE LFPTA (r = 0.41, p = 0.05), and RE (r = 0.53, p = 0.01) and LE HFPTA (r = 0.46, p = 0.03). The relationship between cfPWV and aSBP and select PTA did not remain after adjusting for MMP-2 and resistin (p > 0.05). These data provide novel insights demonstrating that aortic stiffness and aSBP are related to reduced hearing sensitivity, which may, in part, be mediated by inflammation.