| Summary: | 碩士 === 國立臺北護理健康大學 === 語言治療與聽力研究所 === 104 === Objective: To construct changes in acoustic parameters and voice aerodynamic parameters of healthy male adults based upon age effects.
Participation: Total number of 112 participants were assigned into seven groups as per their age (20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80-90).
Methods: Participants were required to read a paragraph and phonate vowel [a]. Speaking fundamental frequency (SFF) and speaking intensity were measured from the reading passage. Voice measures based on the productions of [a] included jitter, shimmer, noise-to-harmonics ratio. The aerodynamic parameters included vital capacity (VC), maximum phonation time (MPT), mean airflow rate (MAF), oral pressure and phonation threshold pressure (PTP). Repeated measures analysis of variance (ANOVA) and simple linear regression analysis were performed to investigate voice measures of different age group.
Results: Significant differences were found in SFF, mean speaking intensity, standard deviation of speaking intensity, highest speaking intensity, lowest speaking intensity, speaking intensity range among different age groups. Measure of SFF, speaking intensity, highest speaking intensity, speaking intensity range increased with age. For aerodynamic changes, VC, MPT, oral pressure and PTP showed significant differences among different age groups. VC decreased with age, and PTP increased with age
Conclusion: This study provides wide variety of voice measures in acoustics and aerodynamic changes among different age of healthy male adults. Statistical differences in voice measures among different age groups may suggest changes at laryngeal structure, respiratory systems, neuromuscular physiology, histology and degeneration of hearing with age. Further research is required in order to find the underlying causes.
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