Limb immobilization alters functional electrophysiological parameters of sciatic nerve

Area of Science:

• Neuroscience
• Physiology
• Traumatology

Background:

• Clinical immobilization for trauma can affect muscles.
• The impact of immobilization on peripheral nerves is not well understood.

Purpose of the Study:

• To investigate the effects of immobilization on sciatic nerve excitability, compound action potential (CAP), and ultrastructure in rats.

Main Methods:

• Rat sciatic nerves were immobilized for 14 days.
• Nerve excitability was assessed using rheobase and chronaxy.
• Compound action potentials (CAPs) and conduction velocity were measured.
• Ultrastructural changes were examined using transmission electron microscopy.

Main Results:

• Immobilization altered nerve excitability, changing rheobase and chronaxy.
• The amplitude of CAP waves was affected, and conduction velocity of the first wave decreased.
• Ultrastructural analysis revealed myelin sheath fragmentation and axon degeneration.

Conclusions:

• Long-lasting leg immobilization induces significant alterations in sciatic nerve function.
• These findings highlight potential nerve damage associated with immobilization therapies.