title: Study of otoacoustic emissions during the female hormonal cycle.
abstract: The hormonal changes that occur in a short time span promote modifications all over the woman's body, with physical and emotional manifestations which are frequently observed.
  
  
  OBJECTIVE
  to evaluate the activity of the external ciliated cells in women during their menstrual cycle, observing the effect of hormonal changes caused by the cycle in their 3 phases.
  
  
  METHODS
  this is a longitudinal prospective study where 21 women between 20 and 35 years old who did not take any contraceptive medicine were assessed. Transient otoacoustic emissions were evaluated by distortion product during the 3 phases of the menstrual cycle (luteal, follicular and ovulatory phases). The SPSS 13.0 software was used to analyze the data.
  
  
  RESULTS
  the phases of menstrual cycle do not alter the amplitude and reproducibility values of the transient otoacoustic emissions. We noticed a difference between the ears in the frequency of 1.5 KHz in the amplitude of emissions by distortion product, and the right ear showed the highest values.
  
  
  CONCLUSIONS
  There are no significant differences in transient otoacoustic emissions and distortion products in the phases of the menstrual cycle.
authors.affiliation: Centro Universitário Planalto do Distrito Federal, DF, Brazil.
authors.forename: Priscila Oliveira
authors.initials: PO
authors.lastname: Arruda
authors.forename: Isabella Monteiro de Castro
authors.initials: IM
authors.lastname: Silva
mesh_terms: D000328:Adult; D005260:Female; D018072:Hair Cells, Auditory, Outer / Q000502:physiology*; D006801:Humans; D008137:Longitudinal Studies; D008597:Menstrual Cycle / Q000502:physiology*; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology*; D011446:Prospective Studies; D012016:Reference Values