Korean J Otolaryngol-Head Neck Surg.
1998 May;41(5):636-639.
Effects of Helium Gas on the Phonatory Function
- Affiliations
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- 1Department of Otolaryngology, Kangbuk Samsung Hospital, College of Medicine, Sungkyunkwan University, Seoul, Korea.
Abstract
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BACKGROUND AND OBJECTIVES: The development of saturation diving has enabled men to work underseas at great depths and for long periods of time. However, the utilization of HeO2 gas mixture has been a aubject of much study. This paper present a discussion effect of the helium gas on speech by usling gas machine which have been developed.
MATERIALS AND METHODS
Twenty male volunteers without voice problems produced /a/ vowel sound before and after helium gas inhalation. The results were analyzed by using an aerophone, an acoustic analyzer, videostroboscopy, and a nasometer.
RESULTS
The first formant, the second formant and the bandwidths of the second formant were significantly increased after helium gas inhalation. A meaningful change was noted in asalance.
CONCLUSION
The helium gas has an effect on the resonant structure of oral and nasal cavity due to its physical characteristics.
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