Action potentials of accessory respiratory muscles in dogs

Ogawa, Tokuo; Jefferson, N. C.; Toman, James E. P.; Chiles, T.; Zambetoglou, A.; Necheles, H.

doi:10.1152/ajplegacy.1960.199.3.569

Cited by 17 publications

(4 citation statements)

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“…Thus the stability of the nasal vestibule during inspira-tion is dependent on both cartilaginous support and muscular activity of the nasal dilator muscles, predominantly the alae nasi (AN) (21). The electromyographic (EMG) activity of the AN muscles is well described (1,11,12,15,19,20,22). The AN demonstrate phasic inspiratory activity that commences before the onset of inspiratory flow, peaks before maximum inspiratory flow, and then progressively declines over the rest of inspiration, reaching tonic baseline levels during midexpiration (4,17,18,22).…”

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Hysteresis of the nasal pressure-flow relationship during hyperpnea in normal subjects

Shi

Seto-Poon

Wheatley

1998

Journal of Applied Physiology

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Hysteresis of the nasal airway pressure-flow relationship (PFR) is seen during hyperpnea, with lower nasal resistance during increasing inspiratory flow than during decreasing flow. We hypothesized that the nasal PFR hysteresis arose in the nasal vestibule airway because of progressive collapse during the inspiration. We measured the inspiratory transnasal and transvestibular PFR for one nasal passage in five normal subjects breathing via a nasal mask during voluntary hyperventilation, both with voluntary nostril flaring and without flaring. The inspiratory hysteresis (IH) was quantified as the ratio of the areas under the descending and ascending pressure-flow curves. Flaring reduced the vestibular IH from 1.96 +/- 0.06 to 1.15 +/- 0.06 and the nasal IH from 2.05 +/- 0.13 to 1.28 +/- 0.06 (both P < 0.01). Our results demonstrate that hysteresis arises in the compliant vestibule segment of the nasal airway, likely because of progressive collapse of the nasal vestibule during inspiration. The findings suggest that hysteresis is prevented by voluntary nostril flaring maintained throughout inspiration.

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confidence: 99%

Hysteresis of the nasal pressure-flow relationship during hyperpnea in normal subjects

Shi

Seto-Poon

Wheatley

1998

Journal of Applied Physiology

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“…"Accessory" respiratory muscles in the tongue, pharynx and larynx also exhibit phasic electrical activities coordinated temporally with respiratory rhythm and they contribute to the patency of the pharyngo-laryngeal spaces during the inspiratory phase (ANDREW, 1955(ANDREW, , 1956BARTLETT et al, 1973 ;BROUILLETTE and THACH, 1980 ;PROCTOR, 1964). Respiratory neural signals to these accessory muscles as well as the phrenic (Phr) nerve activity have been considered to be dependent on Paco, levels (BARTLETT et al, 1973 ;EYZAGUIRRE and TAYLOR, 1963 ;OGAWA et al, 1960;SHERREY and MEGIRIAN, 1977). In anesthetized rats with intact vagi, however, it was found that inspiratory activities of the hypoglossal (XII) and superior laryngeal (Xsl) nerves remained unchanged under elevated end-tidal PCO 2 (PETCO,) although there were clear increases in the Phr activity and in f .…”

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Roles of vagal afferents on discharge patterns and CO2-respon-siveness of efferent superior laryngeal, hypoglossal, and phrenic respiratory activities in anesthetized rats.

Fukuda

Honda

1982

Jpn.J.Physiol

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Discharge patterns and CO2-responsiveness of the efferent respiratory activities in the superior laryngeal (Xsl), hypoglossal (XII), and phrenic (Phr) nerves were compared between vagi-intact and-denervated rats. Bilateral cervical vagotomy decreased the respiratory frequency (f), minute Phr activity (peak integrated Phr activity x f) and consequently elevated end-tidal Pco2 (PETc02). Augmentation of the peak inspiratory activity following vagotomy was much larger in the Xsl and XII nerves than that in the Phr nerve. After vagotomy, the time delay from the onset of inspiratory activities in the Xsl or XII nerve to the onset of the Phr bursts was greatly prolonged. While in the vagi-intact rats the peak inspiratory activities of these cranial nerves were not increased in response to elevated PETcO2, the activities, in particular of the XII nerve, were augmented by high PETc O 2 in the absence of vagal afferents. These results suggested that the vagal afferents inhibit not only phasic Phr discharges but also inspiratory output neurons in the Xsl or XII motor nuclei being activated in normo-and hypercapnia and that they facilitate temporally the onset and progress of inspiratory activities in various groups of respiratory output neurons.

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“…Thus, we believe Campbell's findings have some validity. Ogawa et al (1960) studied 30 so-called accessory respiratory muscles in dogs using in-dwelling electrodes to determine if during hypercapnia, which induced increased respiratory activity that would presumably be associated with forced respiration, these muscles showed activity. The dogs were anaesthetized and placed on their sides for examination of dorsal muscles, and supine for ventral and lateral muscles.…”

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Serratus posterior muscles: Anatomy, clinical relevance, and function

et al. 2001

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The serratus posterior superior and inferior muscles are generally considered clinically insignificant muscles that, based on attachments, probably function in respiration. Interestingly, however, there is no evidence supporting a respiratory role for these muscles. In fact, some electromyographic data refute a respiratory function for these muscles. We suggest that the serratus posterior muscles function primarily in proprioception. Further, these muscles, especially the superior, have been implicated in myofascial pain syndromes and therefore may have greater clinical relevance than commonly attributed to them.

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Action potentials of accessory respiratory muscles in dogs

Cited by 17 publications

References 0 publications

Hysteresis of the nasal pressure-flow relationship during hyperpnea in normal subjects

Hysteresis of the nasal pressure-flow relationship during hyperpnea in normal subjects

Roles of vagal afferents on discharge patterns and CO2-respon-siveness of efferent superior laryngeal, hypoglossal, and phrenic respiratory activities in anesthetized rats.

Serratus posterior muscles: Anatomy, clinical relevance, and function

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