[Comparative study of the nociceptive reflex and late components of the evoked somatosensory potential during stimulation of the sural nerve in healthy subjects].
A study was carried out with 10 normal volunteers in order to find a correlation between nociceptive flexion reflexes from the biceps femoris muscle and the amplitude of the late component (N150-P220) of the vertex evoked potential elicited by sural nerve stimulations at various intensities randomly delivered. The range of stimulus varied from the perception threshold (usually 1 mA) to 2 times the reflex threshold. This latter parameter was usually found between 8 and 11 mA. While the nociceptive flexion reflex increased linearly as a function of stimulation intensity, the amplitude of N150-P220 was maximum at pain threshold and remained in plateau at this level or even slightly decreased as a function of stimulus intensity. No significant correlation was found between the recruitment curve of the nociceptive reflex and that of the late component of the evoked potential as a function of stimulus intensity. Functional implications of these data are discussed.
D000328:Adult; D004558:Electric Stimulation; D005073:Evoked Potentials, Somatosensory; D005260:Female; D006801:Humans; D008297:Male; D009424:Nervous System Physiological Phenomena; D010146:Pain / Q000503:physiopathology*; D010525:Peripheral Nerves / Q000502:physiology; D011999:Recruitment, Neurophysiological; D012018:Reflex / Q000502:physiology*; D012684:Sensory Thresholds
Etude comparative du réflexe nociceptif et des composantes tardives du potentiel évoqué somesthésique lors de stimulations du nerf sural chez l'homme normal.