Balance is something most people take for granted until it fails them. A new study published in the journal eNeuro is offering a revealing look at what happens inside the brain and body when that system is put to the test, and the findings carry serious implications for older adults and those living with Parkinson’s disease.
Falls are one of the leading causes of injury and death among older adults globally, yet the biological mechanisms that make some people more vulnerable than others are still not fully understood. This research takes a meaningful step toward closing that gap by measuring exactly what the brain and muscles are doing in the moments when balance is suddenly disrupted.
Researchers at Emory University explored how brain and muscle activity during balance recovery differ across age groups and health conditions. Their work builds on earlier research that used a straightforward but telling method, pulling a rug out from under participants to trigger an involuntary balance response. In younger adults, that kind of disruption produces an immediate reflex through the brainstem and muscles, followed by a second wave of brain and muscle activity when the challenge becomes more demanding.
What the balance study uncovered in older adults
What the team found in older adults, both with and without Parkinson’s disease, was strikingly different. These groups showed significantly larger brain responses and stronger muscle signals even when the balance disturbances were relatively minor. In other words, their systems were working much harder simply to manage situations that a younger brain and body would handle with far less effort.
That increased effort, however, does not translate into better outcomes. The research found that people who required more brain activity to manage balance actually had a less reliable ability to recover when things went wrong. More engagement from the nervous system was not a sign of greater capacity but rather a sign of strain.
The muscle stiffening pattern linked to poor balance
The study also uncovered a specific physical pattern that may help explain why falls become more frequent with age and in Parkinson’s. When older participants activated a muscle to stabilize themselves, the opposing muscles would simultaneously stiffen up. Rather than allowing a fluid and responsive recovery, that stiffening worked against the body’s effort to regain stability.
Critically, the degree of muscle stiffening was directly linked to worse balance performance. The more the opposing muscles locked up during recovery, the more poorly the person managed the overall balance challenge. This finding adds an important layer to the understanding of why fall risk climbs so sharply in these populations and why standard assessments may not be capturing the full picture.
A new path forward for balance risk assessment
Beyond what the findings reveal about the biology of aging and Parkinson’s, the research team sees a practical clinical application emerging from their work. The methods used in the study could eventually offer a more precise and accessible way to identify people who are at risk of poor balance recovery before a serious fall ever occurs.
Current tools for assessing fall risk tend to focus on observable physical performance, but they do not capture what is happening in the brain and muscles at the level of detail this research explores. By measuring muscle activity patterns during a controlled balance disturbance, clinicians may one day be able to detect elevated brain activity without needing complex neurological equipment.
The researchers acknowledge that further work is needed to refine and optimize the approach before it can be applied in clinical settings. But the possibility of catching at-risk individuals earlier, and connecting them with balance training and targeted exercise before a fall changes everything, makes this line of research one of the more promising developments in fall prevention science in recent years.
For the millions of older adults and Parkinson’s patients navigating daily life with an elevated risk of falling, a tool that can identify that risk early and guide preventive care could be genuinely life-changing. Falls are not simply accidents. For many older adults they mark the beginning of a steep decline in independence, mobility, and overall quality of life. Research that gets ahead of that decline, rather than responding to it after the fact, represents exactly the kind of progress the field needs most.
