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J Appl Physiol (March 15, 2002). doi:10.1152/japplphysiol.00380.2001
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Articles in PresS, published online ahead of print March 15, 2002
J Appl Physiol, 10.1152/jap.00380.2001
Submitted on April 20, 2001
Accepted on March 14, 2002

LARYNGEAL ACTIVITY DURING UPRIGHT VS. SUPINE SWALLOWING

Julie M Barkmeier1*, Steve Bielamowicz2, Naoya Takeda3, and Christy L Ludlow3

1 Laryngeal and Speech Section, National Institutes of Health, Bethesda, MD, USA; Speech and Hearing Sciences, The University of Arizona, Tucson, AZ, USA
2 Laryngeal and Speech Section, National Institutes of Health, Bethesda, MD, USA; Department of Otolaryngology, George Washington University Medical Center, Washington, DC, USA
3 Laryngeal and Speech Section, National Institutes of Health, Bethesda, MD, USA

* To whom correspondence should be addressed. E-mail: jbark{at}u.arizona.edu.

Previous investigations of human pharyngeal muscle activation patterns during swallowing found a relatively invariant muscle activation onset sequence in the upright position. However, different gravitational forces influence a liquid bolus when supine and could modify the central timing control of laryngeal airway protection during swallowing. The purpose of this study was to determine whether laryngeal muscle onset timing during swallowing differed between the supine and upright positions. Nine subjects performed 6 swallowing trials with a 2 cc water bolus in each position. Simultaneous electromyographic recordings were obtained from the submental complex (SMC) and the right and left thyroarytenoid muscles (TA). Regardless of body position, the timing, amplitude, and duration of the TA muscles did not vary relative to the SMC. Therefore, the sequence of TA muscle activation relative to the SMC during swallowing appeared unaffected by gravitational influences.




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