COLUMBIA, SOUTH CAROLINA – A groundbreaking study from researchers at the University of South Carolina (USC) and collaborating institutions suggests that older adults who maintain superior levels of physical function may also be more likely to preserve better hearing sensitivity, a finding that challenges long-held assumptions about the primary drivers of age-related sensory decline. Published in the prestigious journal Scientific Reports in 2026, the investigation provides compelling evidence that physical fitness could play a more direct and independent role in auditory health than previously understood, particularly when separated from the influence of systolic blood pressure.
Challenging the Conventional Wisdom on Aging and Health
For decades, the scientific and medical communities have widely attributed age-related declines across various physiological systems – including physical mobility, sensory acuity, and cognitive function – to a common underlying factor: cardiovascular health. The rationale has often been that a healthy heart and vascular system ensure optimal blood flow and nutrient delivery to all organs, thus protecting against the degenerative processes associated with aging. Consequently, metrics like blood pressure have been central to understanding and managing these age-related changes. However, this new research introduces a nuanced perspective, indicating that while cardiovascular health remains paramount for overall well-being, the specific link between physical function and hearing may operate through pathways not solely mediated by systolic blood pressure.
Age-related hearing loss, medically known as presbycusis, is one of the most prevalent chronic health conditions affecting older adults globally. According to the World Health Organization (WHO), over 1.5 billion people worldwide live with some form of hearing loss, and among those aged 65 and above, approximately one in three are affected. This condition is not merely an inconvenience; it is a significant public health concern with far-reaching consequences, including increased risks of social isolation, depression, cognitive decline, and even dementia. Similarly, declining physical function and inactivity are widespread among older populations, contributing to a higher incidence of falls, chronic diseases, and reduced quality of life. Understanding the intricate relationships between these age-related declines is critical for developing effective interventions that promote healthy aging.
The USC Aging Brain Cohort: A Foundation for Discovery
The study leveraged data from the University of South Carolina’s ongoing Aging Brain Cohort, a comprehensive research initiative designed to meticulously collect a vast array of behavioral, neuroimaging, genetic, and other health information pertinent to the aging process. This long-term project provides a rich dataset for researchers to explore the complex interplay of factors influencing cognitive and sensory health in later life. For the purposes of this specific investigation, researchers examined 150 community-dwelling adults, all between the ages of 50 and 80, a demographic window critical for observing the onset and progression of age-related changes.
Participants underwent a rigorous battery of assessments designed to provide a holistic view of their health status. Hearing sensitivity was precisely measured using pure-tone audiometry, the gold standard for evaluating auditory thresholds across a broad range of frequencies (from 250 Hz to 8,000 Hz) in both ears. This method identifies the softest sound a person can hear at different pitches, providing a detailed audiogram of their hearing ability. Cognitive performance was assessed using the Montreal Cognitive Assessment (MoCA), a widely recognized screening tool for mild cognitive impairment, which evaluates various cognitive domains including attention, executive functions, memory, language, visuospatial skills, and orientation. Systolic blood pressure readings provided a direct measure of cardiovascular health. Crucially, physical function was gauged through the RAND 36-Item Health Survey, a self-report questionnaire that asks participants to rate how much their health limits their ability to perform everyday activities. These activities ranged from walking short distances and climbing stairs to engaging in moderate or vigorous exercise and completing personal care tasks. Higher scores on this survey indicated fewer physical limitations and, therefore, better self-perceived physical function.
Key Findings: Physical Function’s Protective Role
The core finding of the study revealed a statistically significant association between higher physical function scores and lower hearing thresholds, which translates to better hearing sensitivity. After meticulously adjusting for age and sex, the researchers estimated that for every 10-point increase in a participant’s physical-function score, there corresponded an average 1.35 dB HL (decibel Hearing Level) improvement in their hearing threshold. While this effect might appear modest on an individual scale – for instance, a 30-point difference in physical function equating to approximately a 4 dB HL difference in hearing – its implications at the population level are profound. Given the widespread prevalence of hearing loss among older adults, even relatively small improvements or protective effects, when scaled across millions, could lead to substantial public health benefits.
"Aging has long been associated with decreases in physical, sensory, and cognitive functions, and scientists and clinicians previously assumed that cardiovascular health was the common underlying factor in these declines," stated Dr. Jean Neils-Strunjas, Ph.D., chair of the Department of Communication Sciences and Disorders at the University of South Carolina and lead author of the study. "However, our research showed that systolic blood pressure – a measure of cardiovascular health that increases with age – did not appear to impact hearing loss, while physical function seemed to have a protective effect in the group we studied, which was comprised mostly of educated women." This direct quote underscores the study’s challenge to the prevailing paradigm and highlights the unexpected independence of physical function’s role.
Interestingly, the study found that age remained a potent predictor of both systolic blood pressure and hearing loss. On average, every 10-year increase in age was associated with a 7.5 mm Hg increase in systolic blood pressure and an 8.78 dB HL increase in hearing threshold, reinforcing the well-established notion that both blood pressure and hearing decline with advancing years. Furthermore, male participants exhibited poorer hearing than female participants, with average thresholds approximately 4.9 dB HL higher, a sex-based difference consistently observed in many audiological studies.
Crucially, the study found no significant association between systolic blood pressure and either hearing thresholds or cognitive performance within the study population. This specific finding is pivotal because it directly contradicts the hypothesis that systolic blood pressure acts as a mediating factor connecting physical function with sensory and cognitive outcomes. Similarly, physical function showed only a minimal association with cognition in this cohort, and that relationship was also not explained by blood pressure. "These findings suggest that systolic blood pressure does not appear to be a meaningful predictor of hearing loss or cognitive performance in healthy older adults," Neils-Strunjas elaborated. "When taken together with the positive association between physical function and hearing, our research indicates that targeting physical activity directly – rather than relying solely on blood pressure management – could help preserve hearing and cognitive health. Aside from these findings, we recommend that anyone with high blood pressure consult their medical provider." This statement emphasizes a shift in potential intervention strategies, advocating for a direct focus on physical activity.
Unraveling the Mechanisms: How Physical Function Protects Hearing
While the cross-sectional nature of the study prevents establishing a definitive cause-and-effect relationship – meaning it cannot confirm whether better physical function causes better hearing, or if healthy hearing enables more activity, or if other unknown factors influence both – the authors have proposed several plausible biological pathways through which physical activity and robust physical function could support auditory health. These hypothesized mechanisms offer fertile ground for future research and provide a scientific framework for the observed associations:
- Improved Vascular Function and Blood Flow: The cochlea, the snail-shaped organ in the inner ear responsible for hearing, has a highly delicate and intricate blood supply. Regular physical activity is known to improve endothelial function, enhance microcirculation, and promote the growth of new blood vessels. Better blood flow ensures optimal oxygen and nutrient delivery to the sensitive hair cells and neural structures within the cochlea, protecting them from damage and supporting their metabolic demands.
- Reduced Inflammation and Oxidative Stress: Chronic low-grade inflammation and oxidative stress are recognized contributors to age-related cellular damage throughout the body, including the inner ear. Physical activity is a powerful anti-inflammatory agent and boosts the body’s antioxidant defenses. By mitigating systemic inflammation and reducing the accumulation of reactive oxygen species, exercise may directly protect the cochlear structures from harmful degenerative processes.
- Better Metabolic Regulation: Conditions like diabetes and insulin resistance are known risk factors for hearing loss. Physical activity plays a crucial role in maintaining healthy glucose metabolism and improving insulin sensitivity. By promoting better metabolic regulation, exercise could indirectly safeguard auditory function against metabolic disturbances that can harm the inner ear.
- Improved Mitochondrial Health: Mitochondria are the "powerhouses" of cells, and their proper function is vital for energy-intensive cells like those in the cochlea. Exercise is known to enhance mitochondrial biogenesis and efficiency, ensuring that auditory cells have the energy they need to function optimally and resist age-related decline.
- Protection Against Microvascular Damage: Beyond large vessel health, the integrity of tiny blood vessels (microvasculature) is crucial for delicate organs. Physical activity helps maintain the health of these microvessels, potentially preventing the microvascular damage within the cochlea that can contribute to presbycusis.
- Neurotrophic Support: Exercise has been shown to increase levels of neurotrophic factors, such as brain-derived neurotrophic factor (BDNF), which support neuronal growth, survival, and plasticity. These factors could potentially benefit the auditory pathways in the brain, improving central auditory processing and overall hearing perception.
The absence of a clear role for systolic blood pressure in mediating this specific relationship also suggests that relying on a single cardiovascular measurement may not fully capture the complex physiological factors influencing hearing health. Future investigations could explore a broader spectrum of cardiovascular health markers, including arterial stiffness, microvascular integrity, systemic inflammatory activity, metabolic health indicators, immune function, and neurotrophic support to gain a more comprehensive understanding.
Broader Implications for Public Health and Clinical Practice
The findings from the University of South Carolina study carry significant implications for public health initiatives and clinical practice focused on healthy aging. They underscore the importance of promoting and maintaining physical activity as a potentially independent and modifiable factor in preserving hearing health, moving beyond an exclusive focus on blood pressure management.
Public Health Perspective: Given the immense societal burden of age-related hearing loss and the known benefits of physical activity, these results provide additional impetus for public health campaigns advocating for active lifestyles throughout adulthood and into older age. Programs designed to enhance mobility, strength, and endurance in older adults could be framed not just for cardiovascular or musculoskeletal benefits, but also as a strategy to mitigate sensory decline, specifically hearing loss. This could inform the development of targeted exercise interventions for at-risk populations.
Clinical Application: For clinicians, the study advocates for a more holistic and integrated approach to healthy aging. Beyond routine checks of cardiovascular health and sensory screenings, healthcare providers might consider incorporating assessments of physical function into their standard evaluations for older adults. Identifying individuals with declining physical function could serve as an early indicator for potential increased risk of hearing impairment, prompting earlier audiological assessment and intervention. This integration would foster a comprehensive view of patient health, recognizing the interconnectedness of physical, sensory, and cognitive well-being. Furthermore, counseling patients on the specific benefits of exercise for hearing, in addition to its other well-documented advantages, could enhance adherence to physical activity recommendations.
Research Trajectory: The study’s authors are already planning for the future, with the Aging Brain Cohort actively collecting five-year follow-up data. This longitudinal data will be invaluable for establishing causality – determining whether changes in physical function over time are indeed accompanied by corresponding changes in hearing sensitivity. Future research should also aim to diversify study populations, including a wider range of ethnic backgrounds, socioeconomic statuses, and varying health conditions, to ensure the generalizability of these findings. Incorporating objective measures of physical function (e.g., gait speed, grip strength, accelerometer data) rather than solely relying on self-reports would also strengthen the evidence. Finally, interventional studies, where exercise programs are directly implemented and their impact on hearing outcomes are measured, are essential to translate these correlational findings into actionable clinical guidelines.
Important Study Limitations and Nuances
While illuminating, the authors responsibly cautioned that the study’s findings must be interpreted within the context of its inherent limitations. The cross-sectional design means that causality cannot be definitively established; the observed associations are correlations. It is possible that better hearing enables individuals to be more physically active, or that a third, unmeasured factor influences both.
Furthermore, the demographic characteristics of the study sample warrant careful consideration regarding generalizability. The cohort was predominantly female (74%), overwhelmingly White (nearly 99%), and highly educated (84% reported at least a college-level education). Participants were also generally healthy, with average hearing and cognitive scores falling within normal ranges. These characteristics mean that the findings may not apply equally to more diverse populations, individuals with existing health conditions, or those with lower educational attainment. The reliance on self-reported physical function, rather than objective measurements, introduces a potential for reporting bias. Finally, the relatively small sample size (150 participants) and the variations in participants’ use of blood-pressure medications could have limited the statistical power and scope of certain analyses.
Despite these limitations, the University of South Carolina study significantly contributes to the growing body of evidence suggesting that maintaining mobility and embracing an active lifestyle are fundamental components of healthier sensory aging, including the crucial preservation of hearing. It prompts a re-evaluation of the complex factors that influence age-related declines and opens new avenues for holistic interventions aimed at improving the quality of life for older adults worldwide.
Reference:
Neils-Strunjas J, Arjmandi M, Hajihosseini M, et al. Physical function impacts hearing without mediation from systolic blood pressure. Scientific Reports. 2026. https://doi.org/10.1038/s41598-026-55494-w
Source: Scientific Reports, University of South Carolina News.
