Disrupted Corticomuscular Coherence and Force Steadiness During Acute Low Back Pain

Area of Science:

• Neuroscience
• Motor Control
• Pain Research

Background:

• Acute low back pain is known to impair motor control.
• However, its specific effects on force steadiness and cortical activity are not fully understood.

Purpose of the Study:

• To investigate the impact of experimentally induced acute low back pain on motor control, specifically force steadiness and cortical activity.
• To explore the relationship between pain, neuromuscular regulation, and brain function.

Main Methods:

• Healthy adults performed a sustained spinal extension task under pre- and during-pain conditions.
• Electromyography (EMG) and electroencephalography (EEG) were recorded from relevant muscles and cortical areas.
• Analysis included spectral power (alpha, beta, gamma bands) and corticomuscular/cortico-cortical coherence.

Main Results:

• Acute pain significantly reduced force steadiness.
• Cortical activity was altered, with increased beta/gamma power in the prefrontal cortex and decreased alpha power in the motor cortex.
• Nociceptive modulation of corticomuscular coupling was observed in the Cz region during pain.

Conclusions:

• Experimentally induced acute low back pain disrupts motor control.
• Pain modifies cortical activation patterns and reduces force steadiness.
• These findings highlight the complex interplay between pain and neuromuscular regulation.