For many older adults, the simple act of walking while holding a conversation or counting backward is more than a casual activity—We see a complex neurological feat known as dual-tasking. Still, a recent study led by researchers at Concordia University suggests that for those living with mild cognitive impairment (MCI), this ability is significantly hindered by hearing loss, with the impact varying markedly between men and women.
The findings, published in Frontiers in Aging Neuroscience, indicate that poor hearing is strongly linked to slower walking speeds and a less stable gait when mental effort is required. This intersection of sensory loss and cognitive decline creates a precarious situation for older adults, increasing the risk of falls and reducing overall mobility.
The research utilized data from the SYNERGIC clinical trial, a multi-institutional effort designed to explore how combined physical and brain training can mitigate the effects of cognitive decline. By following 75 adults between the ages of 60 and 85 with MCI, the team was able to observe how specific interventions could potentially reverse some of these deficits over a 20-week period.
As a physician, I find these results particularly compelling given that they highlight the “plasticity” of the aging brain. The study suggests that even when an individual faces the dual challenges of hearing loss and cognitive impairment, targeted training can aid the brain rewire its approach to movement and thought, potentially preserving independence for longer.
The Connection Between Hearing and Mobility
Dual-task performance—the ability to move and think simultaneously—is a critical marker for healthy aging. When the brain must allocate resources to both a motor task (walking) and a cognitive task (such as naming animals or counting), any deficit in sensory input or cognitive processing can lead to a “bottleneck.”
The Concordia team found that participants with poor hearing struggled significantly more with these tasks. Those who experienced both hearing loss and lower cognitive performance scored the worst on dual-task measures, exhibiting the most instability and the slowest pace. This suggests that hearing loss may act as an additional cognitive load, forcing the brain to operate harder to process environmental sounds, which in turn leaves fewer resources available for maintaining balance and gait.
Professor Karen Li, a psychologist and director of the Laboratory for Adult Development and Cognitive Aging, noted that the study is particularly novel because it focuses on the pre-dementia stage. While not every individual with MCI will progress to dementia, the severity of their cognitive impairment already plays a measurable role in how they navigate the physical world.
How Sex Influences Recovery and Perception
One of the most striking aspects of the study is how sex influenced both the onset of hearing loss and the response to rehabilitation. The researchers observed a distinct difference in how men and women experienced and reported their hearing deficits, which in turn affected their outcomes during the 20-week intervention.
Lead author Rachel Downey pointed out that while it is well-established that men tend to develop hearing loss earlier and more severely than women, this study is the first to specifically document the relationship between that loss and dual-task performance in male participants.
The study divided participants into three groups to test the efficacy of different interventions:
- Combined Training: A regimen of aerobic and resistance exercise paired with computerized cognitive training.
- Exercise Only: Aerobic and resistance training paired with “sham” cognitive tasks, such as watching videos or performing simple internet searches.
- Placebo: Low-intensity toning and stretching exercises paired with sham cognitive training.
The results showed that the combined group saw the most significant improvements in walking stability. However, the type of hearing loss that predicted improvement differed by sex. For men, those with high levels of objective hearing loss (measured via clinical acuity tests) showed the greatest gains. For women, the most improvement was seen in those who self-reported hearing loss, regardless of whether the objective tests confirmed the same level of severity.
| Intervention Group | Primary Outcome | Key Beneficiaries |
|---|---|---|
| Exercise + Cognitive Training | Greatest improvement in walking stability | Males (Objective loss) & Females (Self-reported loss) |
| Exercise + Sham Training | Moderate/Limited improvement | General aerobic capacity maintenance |
| Placebo (Stretching/Sham) | Little to no improvement | N/A (Some exhibited decline) |
This discrepancy suggests a difference in how hearing loss is perceived or reported between the sexes. The researchers noted that the link between self-reporting and objective loss was weaker in women, suggesting they may be more attuned to—or more concerned about—their hearing changes than the clinical tests indicate.
Practical Implications for Fall Prevention
The ultimate goal of this research is the prevention of falls, which are a leading cause of injury and loss of autonomy in the elderly. When an older adult with MCI and hearing loss attempts to navigate a busy environment—such as a grocery store or a crowded sidewalk—their brain is fighting a multi-front battle to maintain balance while processing fragmented auditory information.
The good news is that these risks are treatable. Co-author Berkley Petersen emphasized that the exercise component of the study was not merely about maintenance; the intensity of the workouts increased every four weeks to challenge the body’s aerobic and resistance capacity.
Because these interventions are non-pharmacological, they offer a low-risk, high-reward path for patients. Many of the cognitive and physical exercises used in the study can be adapted for home employ, making them accessible to those who may have difficulty traveling to a clinic.
For caregivers and clinicians, the takeaway is clear: screening for hearing loss should be a standard part of cognitive health assessments. Addressing hearing deficits—either through aids or targeted training—may be a key component in keeping older adults stable on their feet.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
As researchers continue to analyze the SYNERGIC trial data, the next phase of study will likely focus on the long-term sustainability of these gains and whether the combined training can actually slow the progression of MCI into more severe forms of dementia. Further updates on the clinical application of these non-pharmacological interventions are expected as the multi-institutional team publishes expanded datasets.
We invite you to share your thoughts or experiences with cognitive and physical health in the comments below.
