Abstract
To explore the effect of caffeine on voice, as evidenced by acoustic and aerodynamic measures, based on the fact that caffeine is considered to be a systemic dehydrating agent. The participants in this investigation were 58 females ranging in age from 18 to 35 years, who self-reported normal vocal production. The participants abstained from caffeine ingestion for 24 hours and from ingesting foods and liquids for 12 hours prior to the test. They were randomly assigned to one of two groups, control and experimental, and were individually tested. After the preliminary phase, participants in the experimental group ingested a 100 mg caffeine tablet; participants in the control group ingested placebo, and followed the same protocol as the experimental group. All participants were retested 30 minutes after ingesting caffeine or placebo. Differences were not identified in any of the acoustic or aerodynamic measures across both groups. These results suggest that a conservative (100 mg) dosage of caffeine may not have an impact on vocal acoustics and aerodynamics.
Highlights
Prevention of voice disorders is an important aspect of vocology
The results revealed a substantial increase in irregularity of F0, indicating that caffeine may have a negative impact on voice quality[10]
The main outcomes of this study are related to the three acoustic measures and one aerodynamic measure described in the research questions involving: (a) relative average perturbation (RAP), (b) shimmer, (c) sound pressure level (SPL), and (d) airflow
Summary
Prevention of voice disorders is an important aspect of vocology. In order to provide clinical advice and propose preventive programs for voice disorders, it is necessary to obtain accurate information and empirical data. Approaches used to avoid voice difficulties include knowledge about substances that may have a negative impact on voice production. One substance commonly associated with voice problems by causing systemic dehydration is caffeine. Few investigations have examined the relationship between caffeine intake and voice performance. The objective of this exploratory study was to identify whether caffeine may be implicated in vocal fold function, using acoustic and aerodynamic voice parameters
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