The impact of menopause on vocal quality.

Objective: The purpose of this study was to measure and describe the effect of menopause on vocal characteristics by comparing premenopausal and postmenopausal women (not taking hormone therapy [HT]).
Methods: Thirty-eight postmenopausal women (mean age, 58 y) not taking HT participated in the study. The control group consisted of 34 premenopausal women (mean age, 48 y). To determine the vocal characteristics in both groups, objective (aerodynamic measurements, vocal range measurements, acoustic analysis, electroglottography, and a determination of the Dysphonia Severity Index) and subjective (perceptual evaluation, videostroboscopic evaluation, and Voice Handicap Index) assessment techniques were used.
Results: Postmenopausal women showed a good overall vocal quality, with a Dysphonia Severity Index value of 3.3. Significant differences in aerodynamic parameters (vital capacity and phonation quotient), vocal range (lowest frequency), and acoustic parameters (fundamental frequency [F0] during reading, variation of F0, F0 tremor intensity index, and amplitude tremor intensity index) were found between the premenopausal and postmenopausal women. However, when controlling for age, only phonation quotient and F0 during reading were significantly lower in the group of postmenopausal women. For the perceptual evaluation, significant differences in grade of dysphonia, breathiness, and strained vocal quality were found.
Conclusions: Postmenopausal women not taking HT had a good overall vocal quality. However, in comparison with premenopausal women, they showed a lower habitual F0 in continuous speech.