Effects of a Vocally Fatiguing Task and Systemic Hydration on Men's Voices |
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Authors: | Nancy Pearl Solomon Leslie E Glaze Robert R Arnold Miriam van Mersbergen |
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Institution: | Department of Communication Disorders, University of Minnesota, Minneapolis, USA. Nancy.Solomon@na.amedd.army.mil |
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Abstract: | Voice disorders, specifically vocal fatigue, are more commonly reported by women than by men. Previously, 4 women with normal untrained voices read loudly for 2 hours in an attempt to fatigue the voice. Vocal function deteriorated, as indicated by increases in phonation threshold pressure (PTP) and self-perceived phonatory effort. The increase in PTP was delayed or attenuated to some degree in 3 of the women when they drank ample amounts of water before the experiment. The current study examined the same vocal-loading task and water-drinking condition in 4 vocally normal men. PTP increased after the loud-reading task. Although 2 of the men appeared to benefit from increased systemic hydration (PTP increased more when they were underhydrated than well-hydrated), the other 2 men's data changed in the opposite direction. Phonatory effort correlated well with PTP; this varied across subject and pitch. Laryngeal endoscopy revealed an anterior glottal gap in two men after the loud-reading task. Amplitude of vocal fold vibration was judged to be reduced after the loud-reading task in three subjects when underhydrated and one subject when well hydrated. The high between-subject variability prohibits a conclusion that drinking water is beneficial to vocal function in men, but all subjects studied to date demonstrated detrimental vocal effects of prolonged loud talking. |
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Keywords: | Vocal fatigue Phonation threshold pressure Systemic hydration Gender differences Laryngeal appearance Effort |
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