Study Explores Brain “Volume Control” in Spinal Cord Injuries
For many people, being able to walk again after a spinal cord injury is considered a major milestone. But as anyone living with a spinal cord injury knows, recovery is about much more than taking steps. Everyday activities such as standing still and maintaining balance can remain frustratingly difficult. A recent study shared in Neuroscience News offers new insight into why.
Researchers examined how the nervous system controls muscles in people with incomplete spinal cord injuries, injuries in which some nerve signals can still travel through the spinal cord. Their findings suggest that even when movement returns, communication between the brain, spinal cord, and muscles may not function the same way it did before the injury.
Understanding the Body’s Communication System
Every movement we make relies on “motor units,” the connections between nerves and muscle fibers. In a healthy nervous system, these motor units work together in a coordinated way, allowing us to move smoothly, maintain balance, and adjust our movements without thinking about it.
The researchers compared people with incomplete spinal cord injuries to individuals without injuries. Using specialized sensors placed on the skin, they measured how muscles in the lower leg worked together during different levels of exertion. What they found was striking.
Why Standing Still Can Be Harder Than Walking
At lower levels of effort – similar to the demands of standing, balancing, or maintaining posture – the motor units in participants with spinal cord injuries were less coordinated than those in the control group. The result was less stable muscle control and greater difficulty producing smooth, steady force.
In practical terms, this helps explain why someone may be able to walk across a room yet still struggle with balance, standing in place for extended periods, or performing movements that require precision.
When the Nervous System Overcompensates
The study also found that when participants exerted more force, the nervous system appeared to compensate by sending stronger, less refined signals to the muscles. Rather than coordinating movement with precision, the nervous system essentially “turned up the volume.”
While this strategy may help generate force, it can also lead to stiffness and reduced flexibility in movement. The researchers described this as a loss of adaptability, a nervous system that becomes less able to adjust its movements to the demands of a task.
What This Means for Rehabilitation
Traditionally, rehabilitation after a spinal cord injury has focused heavily on improving strength and mobility. This research suggests that restoring coordination between the nervous system and muscles may be just as important.
Future therapies may focus not only on helping patients move, but also on helping the nervous system relearn how to send smoother, more coordinated signals to the muscles. Researchers believe these newly identified patterns could eventually serve as biomarkers, helping clinicians better measure recovery and develop more targeted rehabilitation strategies.
If You Need Legal Help
Tom Duffy has been a member of the board of Magee Rehabilitation Foundation for over 20 years. He is keenly aware of developments in spinal cord care and has obtained 8-figure verdicts for people who have suffered spinal cord injuries in Philadelphia.
Please contact us if you would like to discuss the details of a possible lawsuit involving negligence.