Comparison of ambulatory and polysomnographic recording of jaw muscle activity during sleep in normal subjects

We used an esophageal electrode to measure the amplitude and neural inspiratory and expiratory (N TE) timing responses of crural diaphragmatic electrical activity in response to flow-resistive (R) and elastic (E) loads at or below the threshold for conscious detection, applied pseudorandomly to the oral airway of eight normal subjects. We observed a rapid first-breath neural reflex that modified respiratory timing such that N TE lengthened significantly in response to R loads in six of eight subjects and shortened in response to E loading in six of seven subjects. The prolongation of N TE with R loading resulted primarily from lengthening the portion of N TE during which phasic activity in the diaphragm is absent (TE NDIA), whereas E loading shortened N TE mainly by reducing TE NDIA. Most subjects responded to both types of loading by decreasing mean tonic diaphragmatic activity, the average level of muscle activity that exists when no phasic changes are occurring, as well as its variability. The observed timing responses are consistent in direction with optimally adaptive pattern regulation, whereas the modulation of tonic activity may be useful in neural regulation of end-expiratory lung volume.

Download Full-text

Jaw‐muscle activity during speech with the mandible fixed

The Journal of the Acoustical Society of America ◽

10.1121/1.385828 ◽

1981 ◽

Vol 69 (5) ◽

pp. 1441-1445 ◽

Cited By ~ 15

Author(s):

John W. Folkins ◽

Gerald N. Zimmermann

Keyword(s):

Muscle Activity ◽

Jaw Muscle

Download Full-text

Electromyographic activity from human laryngeal, pharyngeal, and submental muscles during swallowing

Journal of Applied Physiology ◽

10.1152/jappl.1999.86.5.1663 ◽

1999 ◽

Vol 86 (5) ◽

pp. 1663-1669 ◽

Cited By ~ 92

Author(s):

A. L. Perlman ◽

P. M. Palmer ◽

T. M. McCulloch ◽

D. J. Vandaele

Keyword(s):

Muscle Activity ◽

Total Duration ◽

Normal Subjects ◽

Electromyographic Activity ◽

Surface Electrodes ◽

Submental Muscles ◽

Temporal Relationships ◽

Dependent Change ◽

Significant Difference ◽

High Level

The durations and temporal relationships of electromyographic activity from the submental complex, superior pharyngeal constrictor, cricopharyngeus, thyroarytenoid, and interarytenoid muscles were examined during swallowing of saliva and of 5- and 10-ml water boluses. Bipolar, hooked-wire electrodes were inserted into all muscles except for the submental complex, which was studied with bipolar surface electrodes. Eight healthy, normal, subjects produced five swallows of each of three bolus volumes for a total of 120 swallows. The total duration of electromyographic activity during the pharyngeal stage of the swallow did not alter with bolus condition; however, specific muscles did show a volume-dependent change in electromyograph duration and time of firing. Submental muscle activity was longest for saliva swallows. The interarytenoid muscle showed a significant difference in duration between the saliva and 10-ml water bolus. Finally, the interval between the onset of laryngeal muscle activity (thyroarytenoid, interarytenoid) and of pharyngeal muscle firing patterns (superior pharyngeal constrictor onset, cricopharyngeus offset) decreased as bolus volume increased. The pattern of muscle activity associated with the swallow showed a high level of intrasubject agreement; the presence of somewhat different patterns among subjects indicated a degree of population variance.

Download Full-text