Journal of Audiology & Otology

The Korean Audiology Society (대한청각학회)
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Effects of Caffeine on Auditory- and Vestibular-Evoked Potentials in Healthy Individuals: A Double-Blind Placebo-Controlled Study

  • Tavanai, Elham (Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences) ;
  • Farahani, Saeid (Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences) ;
  • Ghahraman, Mansoureh Adel (Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences) ;
  • Soleimanian, Saleheh (Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences) ;
  • Jalaie, Shohreh (Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences)
  • Received : 2019.06.09
  • Accepted : 2019.09.16
  • Published : 2020.01.20
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Abstract

Background and Objectives:The blockage of adenosine receptors by caffeine changes the levels of neurotransmitters. These receptors are present in all parts of the body, including the auditory and vestibular systems. This study aimed to evaluate the effect of caffeine on evoked potentials using auditory brainstem responses (ABRs) and cervical vestibular-evoked myogenic potentials (cVEMPs) in a double-blind placebo-controlled study. Subjects and Methods: Forty individuals (20 females and 20 males; aged 18-25 years) were randomly assigned to two groups: the test group (consuming 3 mg/kg pure caffeine powder with little sugar and dry milk in 100 mL of water), and the placebo group (consuming only sugar and dry milk in 100 mL water as placebo). The cVEMPs and ABRs were recorded before and after caffeine or placebo intake. Results: A significant difference was observed in the absolute latencies of I and III (p<0.010), and V (p<0.001) and in the inter-peak latencies of III-V and I-V (p<0.001) of ABRs wave. In contrast, no significant difference was found in cVEMP parameters (P13 and N23 latency, threshold, P13-N23 amplitude, and amplitude ratio). The mean amplitudes of P13-N23 showed an increase after caffeine ingestion. However, this was not significant compared with the placebo group (p>0.050). Conclusions: It seems that the extent of caffeine's effects varies for differently evoked potentials. Latency reduction in ABRs indicates that caffeine improves transmission in the central brain auditory pathways. However, different effects of caffeine on auditory- and vestibular-evoked potentials could be attributed to the differences in sensitivities of the ABR and cVEMP tests.

Keywords

References

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