The effect of hearing impairment on the vocal characteristics of older people.

Measures of vocal intensity, frequency and harshness were compared for 19 hearing-impaired and 21 normal-hearing people over 60 years of age. Significantly greater comfortable intensity levels were found in the hearing-impaired group, but the other measures of frequency and harshness were not significantly different. A large proportion of the subjects in both groups reported a history of gastro-oesophageal reflux (GER), a condition associated with vocal fold pathology and hoarseness. Comparison of the GER and non-GER subjects on the measures of vocal function showed that the female GER speakers exhibited lower frequency on the vowel /u/ than the non-GER subjects. Clinicians need to be aware of the effect of highly prevalent disorders such as hearing impairment and GER on the voices of elderly speakers.