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Related Experiment Videos

[Correlation between somatosensory evoked potentials and long loop reflexes--basic investigation and its application

Y Kaneshige1, H Matsumoto, S Chiba

  • 1Department of Rehabilitation and Neurology, Sapporo Medical College, Japan.

No to Shinkei = Brain and Nerve
|October 1, 1989
PubMed
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This study investigated somatosensory evoked potentials (SEPs) and long loop reflexes (LLRs) in healthy individuals and multiple sclerosis (MS) patients. Subject height correlated with LLR and SEP N20 latencies, suggesting a relationship between body size and neural pathway conduction times.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Somatosensory evoked potentials (SEPs) and long loop reflexes (LLRs) are electrophysiological measures used to assess the integrity of somatosensory pathways.
  • Multiple sclerosis (MS) is a demyelinating disease that affects the central nervous system, potentially altering nerve conduction.
  • Understanding the factors influencing LLR and SEP parameters is crucial for accurate clinical interpretation.

Purpose of the Study:

  • To investigate somatosensory evoked potentials (SEPs) and long loop reflexes (LLRs) in normal controls and patients with multiple sclerosis (MS).
  • To examine the relationship between subject height and the latencies of LLRs and SEPs.
  • To explore the characteristics of LLRs in both upper and lower limbs and compare them with short latency reflexes.

Main Methods:

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  • SEPs and LLRs were recorded from 25 normal controls and 25 MS patients following median nerve stimulation.
  • LLRs were also studied in 15 normal controls using common peroneal nerve stimulation.
  • LLRs were triggered during isotonic muscle contractions, and latencies were compared with H-waves and M-waves.

Main Results:

  • Subject height showed a positive correlation with LLR latency and SEP N20 latency, but not with central conduction time.
  • A significant correlation was found between LLR and SEP N20 latencies, with LLRs exhibiting a twofold gradient against N20.
  • The latency difference between H-wave and LLR was significantly prolonged in the lower limb compared to the upper limb.

Conclusions:

  • Subject height is a significant factor influencing LLR and SEP latencies in normal individuals and MS patients.
  • The findings suggest a relationship between body anthropometry and the conduction properties of the somatosensory system.
  • The study provides insights into the neurophysiological characteristics of LLRs and their potential diagnostic value in neurological conditions.