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Influence of methodological parameters on human jaw-stretch reflexes
1Center for Sensory-Motor Interaction, Orofacial Pain Laboratory, Aalborg University, Denmark.
European Journal of Oral Sciences
|May 12, 2001
Summary
This study optimized the human jaw-stretch reflex for investigating motoneuron pool excitability. Key parameters like stretch displacement and ramp time significantly influenced reflex amplitude, ensuring a reliable measurement tool.
Area of Science:
- Neuroscience
- Motor Control
- Biomedical Engineering
Background:
- The human jaw-stretch reflex is crucial for understanding motor control.
- Developing a reliable tool to investigate motoneuron pool excitability is essential for clinical applications.
Purpose of the Study:
- To optimize methodological parameters and experimental conditions for a reliable human jaw-stretch reflex measurement.
- To establish a dependable tool for assessing motoneuron pool excitability.
Main Methods:
- Utilized a custom-made stretch device with computer-controlled displacement and ramp time.
- Measured reflex responses in masseter and anterior temporalis muscle surface electromyogram (EMG).
- Monitored clenching levels and varied stretch parameters and biting positions.
Main Results:
- Jaw-stretch reflex amplitude correlated with EMG activity and stretch displacement.
- Reflex amplitude decreased with increased ramp time.
- No significant differences were found in repeated recordings or between sessions; local anesthesia had no effect.
- Biting position on the device significantly influenced reflex amplitude.
Conclusions:
- Established optimal parameters for a reliable jaw-stretch reflex measurement.
- The developed method provides a robust tool for investigating motoneuron pool excitability.
- Biting position is a critical factor to control in reflex amplitude measurements.