Motor evoked potentials with magnetic stimulation: correlations with height.

Area of Science:

• Neuroscience
• Human Physiology
• Motor Control

Background:

• Motor evoked potentials (MEPs) are crucial for assessing the integrity of the corticospinal tract.
• Understanding factors influencing MEPs, such as anthropometrics, is vital for accurate clinical interpretation.
• Previous research has explored various physiological correlates of MEPs, but the specific impact of height requires further elucidation.

Purpose of the Study:

• To investigate the relationship between body height and motor evoked potentials (MEPs) in healthy young adults.
• To determine if height influences MEP latencies and central conduction times.
• To establish height as a potential factor in defining the normality of MEPs.

Main Methods:

• Fifty-two healthy young subjects participated in the study.
• Motor evoked potentials (MEPs) were recorded from the abductor digiti minimi and tibialis anterior muscles.
• Magnetic stimulation was applied over the vertex, cervical, and lumbar regions to assess different segments of the motor pathway.

Main Results:

• MEP latencies showed a significant positive correlation with subject height.
• Conduction time from the motor cortex to the lumbar region was also correlated with height.
• Conduction time from the motor cortex to the cervical region did not show a significant correlation with height.

Conclusions:

• Body height is a significant determinant of motor evoked potential (MEP) latencies and central conduction times.
• Height-related adjustments are necessary when interpreting MEPs, particularly those involving the lumbar spinal cord.
• These findings highlight the importance of considering anthropometric variables for establishing normative MEP values.