Scientists probe why muscle treatment loses its punch

This study aimed to understand why botulinum toxin injections, a common treatment for muscle stiffness (spasticity) after a stroke, can sometimes become less effective over time. Researchers measured tiny electrical signals, called 'jitter,' in the stiff arm muscles of 40 stroke patients before and after their standard treatment. The goal was to see if these signals could predict how well the treatment works and help doctors make better decisions about future injections.