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Related Experiment Videos

[Suprapubic reflex. Electrophysiological study in normal patients].

G Amarenco1, M Perrigot, B Bayle

  • 1Service de rééducation neurologique et dexplorations périnéales, UPRES 2393, hôpital Rothschild, 33, bd de Picpus, 75571 cedex 12, Paris, France. gerard.amarenco@rth.ap-hop-paris.fr

Annales De Readaptation Et De Medecine Physique : Revue Scientifique De La Societe Francaise De Reeducation Fonctionnelle De Readaptation Et De Medecine Physique
|January 15, 2002
PubMed
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Suprapubic mechanical stimulation reliably elicits a consistent bulbocavernosus reflex (SBR) in healthy individuals. This reflex, characterized by a short latency, suggests a polysynaptic pathway and may play a role in maintaining continence.

Area of Science:

  • Neuroscience
  • Urology
  • Physiology

Background:

  • Suprapubic tapping is a known stimulus for detrusor contraction in neurogenic bladder.
  • This stimulation also induces perineal muscle contraction, a response noted in animal studies but not well-analyzed in men.

Purpose of the Study:

  • To describe pelvic floor responses to suprapubic mechanical stimulation.
  • To measure the reflex latency of these responses.

Main Methods:

  • 21 healthy subjects (14 women, 7 men) were studied.
  • Motor responses were recorded using a needle electrode in the bulbocavernosus muscle.
  • Stimulation involved tapping the suprapubic area with an electromechanical hammer.

Main Results:

Related Experiment Videos

  • A consistent, polyphasic muscular response was elicited in all participants.
  • The mean reflex latency was 67.5 ms (SD=14.7).
  • High reproducibility of the reflex was observed between repeated stimulations.

Conclusions:

  • The study demonstrates a reliable suprapubic bulbocavernosus reflex (SBR).
  • Evidence suggests SBR is a polysynaptic reflex with sacral integration and pudendal nerve efferents.
  • In healthy individuals, SBR may function as a continence reflex by increasing perineal tone during stress.