Journal of Applied Physiology AJP: Cell Physiology
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J Appl Physiol 84: 1701-1706, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 5, 1701-1706, May 1998

Breathing route dependence of upper airway muscle activity during hyperpnea

Yong-Xin Shi1, Margaret Seto-Poon2, and John R. Wheatley1

1 Department of Respiratory Medicine, Westmead Hospital, University of Sydney, Westmead 2145; and 2 Department of Biological Sciences, University of Western Sydney, Kingswood 2747, New South Wales, Australia

Exercise (Ex) and hypercapnia (HC) both lead to increases in ventilation and upper airway muscle (UAM) activity. To determine whether different breathing routes (nasal vs. oral) or stimuli produced differential UAM activation, electromyographic (EMG) activity of the alae nasi (AN) and genioglossus (GG) were measured in seven normal subjects seated on a bicycle ergometer. Subjects performed paired runs during both progressive Ex and HC while breathing through the nose alone (N) or the mouth alone (O). During hyperpnea, AN EMG was greater when the subjects were breathing via N [81 ± 6% maximum (HC) and 69 ± 7% maximum (Ex)] than when they were breathing via O [30 ± 5% maximum (HC) and 27 ± 5% maximum (Ex); both P < 0.01], whereas the GG EMG did not differ between N and O. Both AN and GG EMG were similar for Ex and HC when the subjects were breathing via the same route. We conclude that UAM activation was independent of the nature of the stimulus. However, the AN muscle but not the GG muscle demonstrated breathing-route dependence of activity.

alae nasi muscle; genioglossus muscle; electromyography; exercise; hypercapnia


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