The nervous system isn’t just turning a dial up or down; it’s shifting the load within and between muscles to find a way to keep moving while protecting the tissue. As a clinician, you have to identify which parts of this redistribution are still helping and which parts have become unnecessary adaptations that are now contributing to the problem.
A clinical-focused lesson on the practical application of motor control principles in pain rehabilitation, based on the Paul W. Hodges paper 'Pain and motor control: From the laboratory to rehabilitation'. Focus on translating laboratory findings into treatment strategies for musculoskeletal pain patients.



The vicious cycle theory is the traditional idea that pain causes a predictable, stereotypical increase in muscle activity, which then leads to further pain. However, current research suggests this model is often fundamentally wrong and an oversimplification of how the nervous system actually functions. Many patients show clinical improvement without any measurable changes in their muscle activity, indicating that the relationship between pain and tension is not a universal rule.
No, pain does not always lead to increased muscle tension or guarding. Research into motor control shows that muscle activity in response to pain is non-uniform and varies significantly between individuals. While some people may experience an increase in activity, others show a decrease or no change at all. This means that rigid bracing or a 'permanent shrug' is not a predictable reflex that applies to every patient dealing with chronic back pain.
Practitioners need to move beyond stereotypical models like the vicious cycle to effectively help patients navigate the complexity of the human body. Since muscle activity changes are non-uniform, treating 'guarding' as a standard reflex may not be accurate. Effective pain management requires understanding that the nervous system's response to chronic back pain is complex and that clinical progress can occur even when muscle activity patterns remain the same.
Cree par des anciens de Columbia University a San Francisco
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