title: Effect of caffeine on cervical vestibular-evoked myogenic potential in healthy individuals.
abstract: BACKGROUND
  Caffeine is the most common psychoactive drug in use around the world and is found at different concentrations in a variety of common food items. Clinically, a strong association between caffeine consumption and diseases of the vestibular system has been established. Cervical vestibular-evoked myogenic potential (cVEMP) is an electrophysiological test that is used to assess the sacculocollic pathway by measuring changes in the vestialibulocollic reflex.
  
  
  OBJECTIVE
  The present study aimed to evaluate the effect of an acute dose of caffeine on the vestibulocollic reflex by using cVEMP.
  
  
  METHODS
  A prospective experimental study was performed in which healthy volunteers were submitted to the test before and after the intake of 420 mg of caffeine. The following parameters were compared: p13 and n23 latencies and p13-n23 amplitude.
  
  
  RESULTS
  No statistically significant difference was found in the test results before and after caffeine use.
  
  
  CONCLUSIONS
  The vestibulocollic reflex is not altered by caffeine intake.
authors.affiliation: Instituto de Assistência Médica ao Servidor Público Estadual, São Paulo, SP, Brazil.
authors.forename: Ana Maria Almeida de
authors.initials: AM
authors.lastname: Sousa
authors.affiliation: Instituto de Assistência Médica ao Servidor Público Estadual, São Paulo, SP, Brazil.
authors.forename: Fabio Akira
authors.initials: FA
authors.lastname: Suzuki
mesh_terms: D000328:Adult; D002110:Caffeine / Q000494:pharmacology*; D003430:Cross-Sectional Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012022:Reflex, Acoustic; D058585:Vestibular Evoked Myogenic Potentials / Q000187:drug effects* / Q000502:physiology
chemical_list: D002110:Caffeine