Concussion Management For The Physical Therapist Practice Test

The main idea is that substitution exercises shift the demand from the impaired, integrated neuromotor and sensory systems to other body systems, which can overtax those systems during concussion rehab. In concussion, brain networks involved in processing, attention, balance, and vision are vulnerable. When you use substitution—relying on a different pattern or compensatory strategy to perform a task—you’re not rebuilding the normal, integrated control of movement and perception. Instead, you’re asking other systems to work harder to compensate, which can prolong symptoms, mask ongoing deficits, and potentially slow recovery. That’s why substitution approaches are usually avoided or limited in concussion rehab, especially in the early or more sensitive phases. Visual input isn’t inherently the problem, and many rehab tasks do involve vision; the issue is not about engaging or not engaging vision but about overloading alternate systems through compensations. Increasing cognitive load can happen with substitution, but the core concern is the extra burden placed on non-primary systems, not simply the mental effort. And the notion that they’re too easy misses the point—the risk isn’t difficulty but the tendency to rely on other systems instead of retraining the impaired integration.