Journal
JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH
Volume 44, Issue 2, Pages 297-305Publisher
AMER SPEECH-LANGUAGE-HEARING ASSOC
DOI: 10.1044/1092-4388(2001/024)
Keywords
speech; physiology; loudness; aging; voice
Funding
- NIDCD NIH HHS [R01 DC-01150, P60 DC-00976] Funding Source: Medline
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This study examined the effect of aging on respiratory and laryngeal mechanisms involved in vocal loudness control. Simultaneous measures of subglottal pressure and electromyographic (EMG) activity from the thyroarytenoid (TA), lateral cricoarytenoid (LCA), and cricorhyroid (CT) muscles were investigated in young and old individuals while they attempted to phonate at three loudness levels, soft, comfortable, and loud. Voice sound pressure level (SPL) and fundamental frequency (F-0) measures were also obtained. Across loudness conditions, subglottal pressure levels were similar for both age groups. Laryngeal EMG measures tended to be lower and more variable for old compared with young individuals. These differences were most apparent for the TA muscle. Finally, across the three loudness conditions, the old individuals generated SPLs that were lower overall than those produced by the young individuals but modulated loudness levels in a manner similar to that of the young subjects. These findings suggest that the laryngeal mechanism may be more affected than the respiratory system in these old individuals and that these changes may affect vocal loudness levels.
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