Anaesthesia for the professional singer.
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The singing formant is the product of an articulatory gesture. Devices for phonetogram measurement often claim the ability to determine it. However, they measure rather the overtone content or the noise of the voice than the formant. Moreover, the voice efficiency (ratio of the sound pressure in the frequency band 2-5 kHz to the total sound pressure), also measured by these devices, is not defined in a physical or physiological sense. Such measurement does not evaluate the efficiency of the vocal apparatus.
Understanding how the voice is used in different styles of singing is commonly based on intuitive descriptions offered by performers who are proficient in only one style. Such descriptions are debatable, lack reproducibility, and lack scientifically derived explanations of the characteristics. We undertook acoustic and aerodynamic analyses of a female subject with professional experience in both operatic and Broadway styles of singing, who sang examples in these two styles. How representative the examples are of the respective styles was investigated by means of a listening test. Further, as a reference point, we compared the styles with her speech. Variation in styles associated with pitch and vocal loudness was investigated for various parameters: subglottal pressure, closed quotient, glottal leakage, H1-H2 difference (the level difference between the two lowest partials of the source spectrum), and glottal compliance (the ratio between the air volume displaced in a glottal pulse and the subglottal pressure). Formant frequencies, long-term-average spectrum, and vibrato characteristics were also studied. Characteristics of operatic style emerge as distinctly different from Broadway style, the latter being more similar to speaking.
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This study investigated the effects of group singing instruction on the physical health and general wellness of senior citizens with emphysema. Subjects (n = 7) participated in 6 weeks of group vocal instruction, which emphasized breath management techniques. Dependent measures reflected physical health, functional outcomes, and quality of life. No significant differences were found on measures of physical health (FEV1, inspiratory threshold, distance walked, and The DUKE physical health subscale). Measures of functional outcomes each showed a significant change across time. Results of the ANOVAs for breath management (extent of counting) and breath support (intensity of speech) were significant (p < .038 & p < .000 respectively). Descriptive analyses showed a clear and dramatic shift in breathing mode from clavicular to diaphragmatic breathing that was maintained 2 weeks after the treatment period. Quality of life measures (subjective scales and The Duke Health Profile) yielded mixed results. Findings of this study suggest that vocal instruction, inclusive of breathing exercises, may help to improve the quality of life for senior citizens with emphysema. Subjects in this study responded positively to the instruction and further investigation of the treatment method is warranted.
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The use of a valve to restore functional speech following a total laryngectomy has been well described. We have encountered problems in both the formation of the tracheo-oesophageal fistula and stenosis of the tracheostome if the valve is used by itself for long periods. A simple technique to establish the fistula is described, and a modification of the valve with a stoma button is suggested.
Over the past 11 years, 25 primary and 29 secondary tracheo-oesophageal punctures have been performed in 51 laryngectomees. Pre-operative assessment is required for the secondary procedure. Both primary and secondary procedures require intensive speech therapy after fitting of the prosthesis. Fifty-four per cent of the primary and 37% of the secondary patients attained long-term speech, the latter figure rising to 58% with newer valves and increasing experience. Failures were commonly due to psychological or prosthesis-related problems. Complications were relatively minor, none being life threatening. Seventy per cent of the long-term users were self caring. Adequate rehabilitation counselling and support is necessary to ensure long-term use of the prosthesis.
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