All participants underwent otoscopy and tympanometry, responded to the Profile of Mood State (POMS), submitted to the cVEMP, oVEMP and caloric tests in that order. After that the participants received placebo or caffeine capsule (300mg). After 45 minutes the subjects again responded to the POMS, repeated the cVEMP, oVEMP and caloric test. The tests were performed in a center of rehabilitation of hearing and balance for the same audiologist, with the data collection period was 3 months.