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From the Denver Center for the Performing Arts (Drs. Baker and Ramig), Wilbur J. Gould Voice Research Center, Denver, CO; the Speech Language Hearing Sciences Department (Dr. Ramig), University of Colorado, Boulder, CO; the Department of Speech Pathology and Audiology (Dr. Luschei), University of Iowa, Iowa City, IA; and the University Medical Center (Dr. Smith), University of Utah, Salt Lake City, UT.
Address correspondence and reprint requests to Dr. Kristin Baker, Denver Center for the Performing Arts, Wilbur J. Gould Voice Research Center, 1245 Champa Street, Denver, CO 80204.
Objective: To compare electromyographic (EMG) amplitudes of the thyroarytenoid (TA) muscle in young and older individuals and individuals with idiopathic PD (IPD) under conditions of known vocal loudness (sound pressure level).
Background: Voice disorders frequently accompany aging and IPD, but it is unclear how laryngeal muscle physiology is affected by these processes and how changes in laryngeal muscle activity result in characteristic changes of the voice.
Methods: Absolute and relative (to maximum) EMG amplitudes of the TA muscle were compared during speech and nonspeech tasks. Corresponding sound pressure (SPL) measures were obtained for the speech tasks.
Results: Absolute TA amplitudes were consistently the highest in the young individuals, lowest in the individuals with IPD, and intermediate in the older individuals. Relative TA amplitudes were generally the highest for the young individuals, lowest for the older individuals, and intermediate for the individuals with IPD. SPL findings showed the older individuals and individuals with IPD produced most of the speech tasks with comparable SPLs, and these levels were consistently lower than those of the young individuals.
Conclusions: Reduced levels of TA muscle activity may contribute to the characteristic hyophonic voice disorders that frequently accompany IPD and aging.
Supported in part by research grants R01 DC-01150 and P60 DC-00976 from the National Institute on Deafness and Other Communication Disorders, National Institute of Health, Bethesda, MD.
Received February 6, 1998. Accepted in final form August 14, 1998.
This article has been cited by other articles:
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 U K Misra and J Kalita Prognosis of Japanese encephalitis patients with dystonia compared to those with parkinsonian features only Postgrad. Med. J., April 1, 2002; 78(918): 238 - 241. [Abstract] [Full Text] [PDF]
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 L O Ramig, S Sapir, S Countryman, A A Pawlas, C O'Brien, M Hoehn, and L L Thompson Intensive voice treatment (LSVT(R)) for patients with Parkinson's disease: a 2 year follow up J. Neurol. Neurosurg. Psychiatry, October 1, 2001; 71(4): 493 - 498. [Abstract] [Full Text] [PDF]
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