| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Original Articles |
The genioglossus muscle has at least two types of motor unit with respiratory-related activity. Inspiratory motor units show phasic activity during inspiration, whereas inspiratory/expiratory motor units show phasic inspiratory activity superimposed on tonic activity. The purpose of this study was to investigate the physiological roles of these different genioglossus motor units. The unitary activities of 12 inspiratory and 12 inspiratory/expiratory motor units were recorded using fine-wire electrodes during quiet nasal breathing in eight normal adult males. The mean interspike interval and the SD of successive spikes were calculated for inspiratory and inspiratory/expiratory motor units, respectively. Scattergrams of the mean interspike interval versus SD were constructed for the two groups of motor units. The effects of changes in head position on the firing activity and the patterns of distribution of the mean interspike interval versus its SD were significantly different for inspiratory and inspiratory/expiratory motor units. These results suggest that the inspiratory and inspiratory/expiratory motor units have different functional roles in respiration; inspiratory motor units may be phasically active to counteract intraluminal negative pressure during inspiration, whereas inspiratory/expiratory motor units may be tonically active to maintain tongue posture.
This article has been cited by other articles:
|
|
 |
|
  J. E. Butler and S. C. Gandevia The output from human inspiratory motoneurone pools J. Physiol., March 1, 2008; 586(5): 1257 - 1264. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. S. Doherty, J. P. Cullen, P. Nolan, and W. T. McNicholas The human genioglossus response to negative airway pressure: stimulus timing and route of delivery Exp Physiol, February 1, 2008; 93(2): 288 - 295. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. F. Bailey, K. W. Fridel, and A. D. Rice Sleep/Wake Firing Patterns of Human Genioglossus Motor Units J Neurophysiol, December 1, 2007; 98(6): 3284 - 3291. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. J. Thexton, A. W. Crompton, and R. Z. German Electromyographic activity during the reflex pharyngeal swallow in the pig: Doty and Bosma (1956) revisited J Appl Physiol, February 1, 2007; 102(2): 587 - 600. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. F. Bailey, A. D. Rice, and A. J. Fuglevand Firing Patterns of Human Genioglossus Motor Units During Voluntary Tongue Movement J Neurophysiol, January 1, 2007; 97(1): 933 - 936. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. P. Saboisky, J. E. Butler, R. B. Fogel, J. L. Taylor, J. A. Trinder, D. P. White, and S. C. Gandevia Tonic and Phasic Respiratory Drives to Human Genioglossus Motoneurons During Breathing J Neurophysiol, April 1, 2006; 95(4): 2213 - 2221. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. J. Sokoloff Activity of tongue muscles during respiration: it takes a village? J Appl Physiol, February 1, 2004; 96(2): 438 - 439. [Full Text] [PDF]
|
|
|
|
|
|
P. R. Eastwood, G. T. Allison, K. L. Shepherd, I. Szollosi, and D. R. Hillman Heterogeneous activity of the human genioglossus muscle assessed by multiple bipolar fine-wire electrodes J Appl Physiol, May 1, 2003; 94(5): 1849 - 1858. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
