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Somatosensory evoked potentials during standing posture on different support surface.

T Gavrilenko1, P Gatev, G N Gantchev

  • 1Institute of Physiology, Bulgarian Academy of Sciences.

Homeostasis in Health and Disease : International Journal Devoted to Integrative Brain Functions and Homeostatic Systems
|April 1, 1991
PubMed
Summary

Altered postural conditions, like standing on a seesaw or short surface, reduce somatosensory evoked potentials (SEPs). These changes in cerebral potentials highlight the impact of posture stability on sensory processing.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomechanics

Background:

  • Somatosensory evoked potentials (SEPs) reflect the brain's processing of sensory information from the body.
  • Postural control is essential for daily activities and relies on sensory feedback.
  • Understanding how altered support surfaces affect neural processing is crucial for rehabilitation and understanding balance disorders.

Purpose of the Study:

  • To investigate the impact of different postural conditions on somatosensory evoked potentials (SEPs).
  • To determine how unstable or reduced support surfaces influence the amplitude of early and late SEP components.

Main Methods:

  • SEPs were recorded following posterior tibial nerve stimulation at the ankle.
  • Participants stood on three different surfaces: stable ground, an unstable seesaw, and a short support surface.

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  • Amplitudes of specific SEP components (N32-P39, N49-P58, P58-N76, N76-P117) were analyzed and compared across conditions.

    • Main Results:

    • Standing on both the seesaw and short support surface decreased the amplitude of the early SEP component (N32-P39).
    • The amplitude of the N49-P58 component decreased specifically on the short support surface.
    • Later SEP components (N49-P58, P58-N76, N76-P117) showed reduced amplitude on the seesaw compared to stable or short surfaces.

    Conclusions:

    • The amplitude of cerebral potentials, as measured by SEPs, is significantly attenuated under challenging postural conditions.
    • Postural stability directly influences the brain's processing of somatosensory information.
    • These findings have implications for understanding sensorimotor integration and balance deficits.