Structural and mechanical alterations in spastic skeletal muscle.

Area of Science:

• Neurology
• Muscle Physiology
• Rehabilitation Science

Background:

• Spasticity, resulting from upper motor neuron lesions, significantly impacts skeletal muscle function.
• Lesions can stem from various conditions including stroke, head/spinal cord injury, multiple sclerosis, and cerebral palsy.
• The precise mechanisms behind functional deficits in spasticity remain incompletely understood.

Purpose of the Study:

• To review and evaluate existing literature on skeletal muscle tissue alterations in spastic conditions.
• To determine if spastic muscles exhibit unique plasticity distinct from other models.
• To identify areas for future research to inform therapeutic development.

Main Methods:

• Evaluation of experimental studies examining joint mechanics.
• Assessment of studies focusing on tissue mechanics.
• Analysis of research investigating muscle morphology in spasticity.

Main Results:

• The reviewed literature provides strong evidence that skeletal muscles are indeed altered in spasticity.
• These alterations present a unique form of muscle plasticity.
• The observed changes are inconsistent with simple transformations due to chronic stimulation or disuse.

Conclusions:

• Spastic muscles undergo unique modifications not seen in other plasticity models.
• Further research is needed to elucidate intra- and extracellular changes in skeletal muscle secondary to spasticity.
• Detailed understanding of these modifications is crucial for developing novel therapeutic interventions for spasticity.