Objectives: Hearing loss is a prevalent condition in older adults. Epigenetic age acceleration has emerged as a potential biomarker for age-related diseases; however, there is limited evidence of the link between epigenetic age acceleration and hearing loss in older adults or how it varies by sex. This study is to investigate (1) the association between epigenetic age acceleration and hearing function and (2) sex differences in this association.
Design: Data from the Health and Retirement Study, a large, nationally representative sample of adults aged 50 yrs and older, were analyzed. The study included 1755 adults from the 2016 sample with epigenetic data. Epigenetic age acceleration included five epigenetic clocks: Horvath's age acceleration (HorvathAA), Hannum's age acceleration (HannumAA), phenotypic age acceleration (PhenoAA), GrimAge acceleration (GrimAA), and methylation-based pace of aging estimate (DunedinPoAm). Multivariable regression models assessed the association between epigenetic age acceleration and mean hearing test score (linear) and hearing loss (logistic).
Results: The mean chronological age of 68.4 (SD = 9.4) was higher than the mean epigenetic age ranging from 53.9 (SD = 8.9) for HannumAge to 67.1 (SD = 8.6) for GrimAge. Overall, 58.4% of participants had hearing loss, with a mean hearing test score of 4.6 (1.4). Phenotypic age acceleration, GrimAA, and methylation-based pace of aging estimate were significantly associated with lower hearing test scores (β [95% confidence interval {CI}] = -0.081 [-0.15 to -0.01]; -0.150 [-0.22 to -0.08]; -0.089 [-0.16 to -0.02], respectively). These associations remained significant in females, while only GrimAA was still significant in males. GrimAA was associated with higher odds of hearing loss (odds ratio [95% CI] =1.23 [1.05 to 1.44]), and remained significant in females (1.47 [1.18 to 1.83]), but not in males.
Conclusions: This study highlights the potential of epigenetic age acceleration as a biomarker for hearing loss in older adults and underscores the importance of sex differences in aging research. Findings suggest further research is needed to explore epigenetic mechanisms as potential targets for interventions to mitigate hearing loss in older adults, particularly among females.
Objectives: Otitis media (OM) is a significant health concern, particularly among Aboriginal and/or Torres Strait Islander children who experience one of the highest rates of OM globally. This study aimed to evaluate the use and differences of wideband absorbance at ambient pressure (WBA) among urban Aboriginal and/or Torres Strait Islander and non-Aboriginal children with suspected OM based on standard tympanometry.
Design: We conducted a cross-sectional observational study in Perth, Western Australia, recruiting children from both tertiary and community-based healthcare settings. A total of 53 children (106 ears) were included in this study, of which 30 children (60 ears) were Aboriginal and/or Torres Strait Islander (mean age 4.67 ± 3.76, range: 0.59 to 14.96 years) and 23 children (46 ears) were non-Aboriginal (mean age 3.94 ± 1.53, range: 1.93 to 6.01 years). Each child underwent an audiological assessment, which included otoscopy, single-frequency tympanometry, WBA, otoacoustic emissions, and age-appropriate audiometry. Audiologist examination and interpretation of standard audiological results served as the reference standard for a suspected OM diagnosis.
Results: WBA analysis was performed on 104 ears, of which 30 ears were diagnosed with suspected OM using single-frequency tympanometry results. When comparing ears, mean WBA was similar between non-Aboriginal children and Aboriginal and/or Torres Strait Islander children without suspected OM at all frequencies (p > 0.05). Mean WBA was significantly reduced between 500 and 4000 Hz in all children with suspected OM, with a peak difference at 1600 Hz observed between groups (p < 0.001). Overall, WBA was more reduced in Aboriginal and/or Torres Strait Islander children with suspected OM compared with non-Aboriginal children with suspected OM, the only significant difference was observed at 800 Hz (p = 0.037).
Conclusions: For this sample of children living in an urban area, WBA is significantly reduced in the ears of children with suspected OM compared with those children with healthy middle ears. Aboriginal and/or Torres Strait Islander children without suspected OM show comparable WBA results to non-Aboriginal children with normal ears. However, Aboriginal and/or Torres Strait Islander children with suspected OM exhibit lower overall WBA than their non-Aboriginal peers with OM, with a significant difference observed at 800 Hz. These findings support previous research that suggests WBA may be a valuable tool in detecting OM, particularly in high-risk populations. Further research is needed to investigate the factors contributing to reduced WBA in Aboriginal and/or Torres Strait Islander children with OM and to validate WBA's potential in addressing the under-detection of OM in this population.
Objectives: While the mechanisms underlying age-related changes in speech recognition are thought to be multifactorial, cochlear synaptopathy has been proposed as a possible peripheral auditory contributor. Although evidence from animal and human temporal bone studies supporting the presence of age-related cochlear synaptopathy appears compelling, findings from prospective studies in humans have been less conclusive. The goals of this study were to investigate the effect of aging on measures historically used to assess retrocochlear function-speech recognition performance-intensity functions in noise, and high-level auditory brainstem responses (ABR) at two presentation rates, and to examine their association.
Design: Nineteen younger (18 to 36 yrs) and 19 older adults (65 to 81 yrs) with normal audiometric pure-tone averages and clinically present distortion product otoacoustic emissions took part in this study. All test materials were presented to the right ear through insert earphones. Performance-intensity functions were obtained using Northwestern University Auditory Test No. 6 words in multitalker babble, at 6 signal to noise ratios (SNRs) ranging from -5 to +20 dB SNR (noise fixed at 50 dB HL). ABRs were recorded in response to 80 dB nHL clicks presented at a slower rate (11.3/sec) and a faster rate (41.3/sec).
Results: The performance-intensity function slopes were comparable between the younger and older age groups, but older adults needed more favorable SNRs to achieve the same level of performance as their younger counterparts. The electrophysiological finding of lower I/V ABR amplitude ratios in older adults is consistent with an interpretation of cochlear synaptopathy. However, there was no association between the speech recognition performance-intensity function metrics and ABR I/V amplitude ratios, even though full performance-intensity functions were obtained, using low-context monosyllabic words that depend more heavily on peripheral processing.
Conclusions: Results of this study show that aging negatively impacted speech recognition in noise and ABR responses. Although the age-related reduction in ABR wave I/V ratios could be interpreted as evidence of cochlear synaptopathy, age did not differentially impact speech recognition in noise as a function of SNR. In addition, there was no association between the electrophysiological and performance-intensity function metrics. These results add to a growing list of perceptual measures that did not follow the pattern of results predicted by age-related cochlear synaptopathy, despite the expected reduction in ABR wave I/V ratios.

