Relevant bibliographies by topics / Genioglossus

Academic literature on the topic 'Genioglossus'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Genioglossus"

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Dotan, Yaniv, Giora Pillar, Alan R. Schwartz, and Arie Oliven. "Asynchrony of lingual muscle recruitment during sleep in obstructive sleep apnea." Journal of Applied Physiology 118, no. 12 (June 15, 2015): 1516–24. http://dx.doi.org/10.1152/japplphysiol.00937.2014.

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Pharyngeal collapsibility during sleep increases primarily due to decline in dilator muscle activity. However, genioglossus EMG is known to increase during apneas and hypopneas, usually without reversing upper airway obstruction or inspiratory flow limitation. The present study was undertaken to test the hypothesis that intense activation of the genioglossus fails to prevent pharyngeal obstruction during sleep, and to evaluate if sleep-induced changes in tongue muscle coordination may be responsible for this phenomenon. We compared genioglossus and tongue retractors EMG activity in 13 obstructive sleep apnea (OSA) patients during wakefulness, while breathing through inspiratory resistors, to the activity observed at the end of apneas and hypopneas after 25 mg of brotizolam, before arousal, at equal esophageal pressure. During wakefulness, resistive breathing triggered increases in both genioglossus and retractor EMG. Activation of agonist tongue muscles differed considerably from that of the arm, as both genioglossus and retractors were activated similarly during all tongue movements. During sleep, flow limitation triggered increases in genioglossal EMG that could reach more than twofold the level observed while awake. In contrast, EMGs of the retractors reached less than half the wakefulness level. In sleeping OSA patients, genioglossal activity may increase during obstructed breathing to levels that exceed substantially those required to prevent pharyngeal collapse during wakefulness. In contrast, coactivation of retractors is deficient during sleep. These findings suggest that sleep-induced alteration in tongue muscle coordination may be responsible for the failure of high genioglossal EMG activity to alleviate flow limitation.
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Anker, A. R., A. Ali, H. E. Arendt, S. P. Cass, L. A. Cotter, B. J. Jian, B. Tamrazi, and B. J. Yates. "Use of electrical vestibular stimulation to alter genioglossal muscle activity in awake cats." Journal of Vestibular Research 13, no. 1 (September 1, 2003): 1–8. http://dx.doi.org/10.3233/ves-2003-13101.

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Prior work has shown that the vestibular system contributes to regulating activity of upper airway muscles including the tongue protruder muscle genioglossus. The goal of the present experiments was to determine whether electrical vestibular stimulation could potentially be used to alter genioglossal activity in awake animals. Six adult cats were instrumented for recording of EMG activity from genioglossus, abdominal musculature, and triceps. In addition, a silver ball electrode was implanted on the round window for stimulation of vestibular afferents. Subsequently, stimulation and recordings were conducted while animals were awake. In all cases, stimulation using single shocks or trains of pulses > 100 μA in intensity produced responses in all muscles, including genioglossus. The latency of the genioglossal response was approximately 12 msec, and delivering continuous current trains to the labyrinth chronically elevated the muscle's activity. Although a number of muscles were affected by the stimulus, animals experienced no obvious distress or balance disturbances. Vestibular stimulation remained effective in producing genioglossal responses until experiments were discontinued 1–2 months following onset. These data suggest that electrical vestibular stimulation could potentially be used therapeutically to alter upper airway muscle activity.
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Saboisky, Julian P., Amy S. Jordan, Danny J. Eckert, David P. White, John A. Trinder, Christian L. Nicholas, Shiva Gautam, and Atul Malhotra. "Recruitment and rate-coding strategies of the human genioglossus muscle." Journal of Applied Physiology 109, no. 6 (December 2010): 1939–49. http://dx.doi.org/10.1152/japplphysiol.00812.2010.

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Single motor unit (SMU) analysis provides a means to examine the motor control of a muscle. SMUs in the genioglossus show considerable complexity, with several different firing patterns. Two of the primary stimuli that contribute to genioglossal activation are carbon dioxide (CO2) and negative pressure, which act through chemoreceptor and mechanoreceptor activation, respectively. We sought to determine how these stimuli affect the behavior of genioglossus SMUs. We quantified genioglossus SMU discharge activity during periods of quiet breathing, elevated CO2 (facilitation), and continuous positive airway pressure (CPAP) administration (inhibition). CPAP was applied in 2-cmH2O increments until 10 cmH2O during hypercapnia. Five hundred ninety-one periods (each ∼3 breaths) of genioglossus SMU data were recorded using wire electrodes( n = 96 units) from 15 awake, supine subjects. Overall hypercapnic stimulation increased the discharge rate of genioglossus units (20.9 ± 1.0 vs. 22.7 ± 0.9 Hz). Inspiratory units were activated ∼13% earlier in the inspiratory cycle, and the units fired for a longer duration (80.6 ± 5.1 vs. 105.3 ± 4.2% inspiratory time; P < 0.05). Compared with baseline, an additional 32% of distinguishable SMUs within the selective electrode recording area were recruited with hypercapnia. CPAP led to progressive SMU inhibition; at ∼6 cmH2O, there were similar numbers of SMUs active compared with baseline, with peak frequencies of inspiratory units close to baseline, despite elevated CO2 levels. At 10 cmH2O, the number of units was 36% less than baseline. Genioglossus inspiratory phasic SMUs respond to hypercapnic stimulation with changes in recruitment and rate coding. The SMUs respond to CPAP with derecruitment as a homogeneous population, and inspiratory phasic units show slower discharge rates. Understanding upper airway muscle recruitment/derecruitment may yield therapeutic targets for maintenance of pharyngeal patency.
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Leiter, J. C. "Analysis of pharyngeal resistance and genioglossal EMG activity using a model of orifice flow." Journal of Applied Physiology 73, no. 2 (August 1, 1992): 576–83. http://dx.doi.org/10.1152/jappl.1992.73.2.576.

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A model of orifice flow has been used to analyze the relationships among pressure, flow, and genioglossal electromyographic activity in the human pharynx during inspiration. The orifice flow model permits one to assess the character of airflow (laminar or turbulent) and to estimate the cross-sectional area of the orifice from pressure and flow measurements. On the basis of other data (J. Appl. Physiol. 73: 584–590, 1992), this analysis suggests that pharyngeal airflow is turbulent. Furthermore the area of the pharynx appears to increase as flow increases, but the actual change in pharyngeal diameter necessary to fit the pressure-flow data is quite small (0.11–0.87 cm, depending on the assumptions in the model). The flow-related increase in orifice area can be attributed, in part, to the activation of the genioglossus muscle. However, other flow-related factors may also contribute to pharyngeal dilation as airflow increases. Different airway shapes (circular and elliptical) and orientations (major axis anteroposterior and lateral) were incorporated into the model calculations; these factors modify considerably the apparent efficiency of genioglossal electromyographic activity. Genioglossal muscle shortening increases pharyngeal area and reduces pharyngeal resistance more effectively when the pharynx is elliptical, with the long axis of the ellipse oriented laterally. Hence the genioglossus may operate at a significant mechanical disadvantage in those patients with obstructive sleep apnea with a small sagittally oriented pharyngeal lumen.
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Kang, Jing, and Ming-Xian Li. "Effects of Habenular Stimulation Frequencies on Obstructive Sleep Apnea Induced by Stimulation of Insular Cortex." Canadian Respiratory Journal 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/9060678.

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Objective. To investigate the effects of high-frequency stimulation of the habenula (Hb) on obstructive sleep apnea (OSA) induced by stimulation of the insular cortexMethod. After OSA was induced by stimulating the insular cortex (Ic) with concentric stimulating electrodes at 100 Hz in rats, the Hb was stimulated at different frequencies (50 Hz, 120 Hz, 130 Hz, and 280 Hz). The changes of apnea events and electromyography (EMG) of the genioglossus were compared before and after stimulation of the Hb.Results. With stimulation of the Ic at 100 Hz, apnea events were successfully induced with disappearance of EMG of the genioglossus. After stimulation of the Hb at 130 Hz, apnea events disappeared with significantly increased genioglossal EMG. However, such a change failed to be found at the stimulation frequencies of 50 Hz, 120 Hz, and 280 Hz.Conclusion. Stimulation of the Hb at the frequency of 130 Hz could effectively inhibit OSA events induced by stimulation of the Ic.
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Sha, B. F. Bu, S. J. England, R. A. Parisi, and R. J. Strobel. "Force production of the genioglossus as a function of muscle length in normal humans." Journal of Applied Physiology 88, no. 5 (May 1, 2000): 1678–84. http://dx.doi.org/10.1152/jappl.2000.88.5.1678.

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Resting muscle length affects both maximum force production and force maintenance. The strength and force maintenance characteristics of the genioglossus as a function of resting muscle length have not been described. We hypothesized that genioglossus optimum length ( L o) could be defined in vivo and that the ability of the genioglossus to sustain a given workload would decrease as resting length deviated from L o. To test this, 11 normal men repeated maximal isometric genioglossus protrusions at different muscle lengths to determine L o. L o was also obtained by using submaximal efforts while simultaneously recording electromyographic activity of the genioglossus, with L o defined as the length at which the force-to-genioglossus electromyographic activity ratio was maximum. Both methods provided similar results. Force maintenance was measured at four muscle lengths on separate days. Target efforts representing 60% of each subject's maximum at L o and lasting 5 s were performed at 12-s intervals. Time limit of endurance of the genioglossus was defined as the time from trial onset at which 90% of the target could not be maintained for three consecutive efforts. Time limit of endurance was greatest at L o and fell to 47.5% at L o + 1 cm, 53.8% at L o − 1 cm, and 47.4% at L o − 1.5 cm. We conclude that L o of the genioglossus can be determined in vivo and that force maintenance of the genioglossus is decreased when operating length deviates from L o.
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Carberry, Jayne C., Hanna Hensen, Lauren P. Fisher, Julian P. Saboisky, Jane E. Butler, Simon C. Gandevia, and Danny J. Eckert. "Mechanisms contributing to the response of upper-airway muscles to changes in airway pressure." Journal of Applied Physiology 118, no. 10 (May 15, 2015): 1221–28. http://dx.doi.org/10.1152/japplphysiol.01103.2014.

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This study assessed the effects of inhaled lignocaine to reduce upper airway surface mechanoreceptor activity on 1) basal genioglossus and tensor palatini EMG, 2) genioglossus reflex responses to large pulses (∼10 cmH2O) of negative airway pressure, and 3) upper airway collapsibility in 15 awake individuals. Genioglossus and tensor palatini muscle EMG and airway pressures were recorded during quiet nasal breathing and during brief pulses (250 ms) of negative upper-airway pressure. Lignocaine reduced peak inspiratory (5.6 ± 1.5 vs. 3.8 ± 1.1% maximum; mean ± SE, P < 0.01) and tonic (2.8 ± 0.8 vs. 2.1 ± 0.7% maximum; P < 0.05) genioglossus EMG during quiet breathing but had no effect on tensor palatini EMG (5.0 ± 0.8 vs. 5.0 ± 0.5% maximum; P = 0.97). Genioglossus reflex excitation to negative pressure pulses decreased after anesthesia (60.9 ± 20.7 vs. 23.6 ± 5.2 μV; P < 0.05), but not when expressed as a percentage of the immediate prestimulus baseline. Reflex excitation was closely related to the change in baseline EMG following lignocaine ( r2 = 0.98). A short-latency genioglossus reflex to rapid increases from negative to atmospheric pressure was also observed. The upper airway collapsibility index (%difference) between nadir choanal and epiglottic pressure increased after lignocaine (17.8 ± 3.7 vs. 28.8 ± 7.5%; P < 0.05). These findings indicate that surface receptors modulate genioglossus but not tensor palatini activity during quiet breathing. However, removal of input from surface mechanoreceptors has minimal effect on genioglossus reflex responses to large (∼10 cmH2O), sudden changes in airway pressure. Changes in pressure rather than negative pressure per se can elicit genioglossus reflex responses. These findings challenge previous views and have important implications for upper airway muscle control.
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Hollowell, D. E., P. R. Bhandary, A. W. Funsten, and P. M. Suratt. "Respiratory-related recruitment of the masseter: response to hypercapnia and loading." Journal of Applied Physiology 70, no. 6 (June 1, 1991): 2508–13. http://dx.doi.org/10.1152/jappl.1991.70.6.2508.

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To test the hypothesis that a muscle that closes the jaw, the masseter, can be recruited by ventilatory stimuli, we studied the electromyographic activation of the masseter and genioglossus in seven normal awake males who were exposed in random order to progressive hyperoxic hypercapnia, inspiratory threshold loading (-40 cmH2O), and combined hypercapnia and loading. With hypercapnia, the masseter was generally recruited after the genioglossus had been activated. Once recruited, activation of both muscles increased linearly with increasing CO2. Combined hypercapnia and loading produced more activation than either stimulus alone. These data indicate that the masseter is activated by ventilatory stimuli that activate the genioglossus. Earlier recruitment of the genioglossus suggests that activation of the masseter serves to stabilize the mandible and allow the genioglossus to function as a more efficient dilator of the upper airway.
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Eikermann, Matthias, Atul Malhotra, Philipp Fassbender, Sebastian Zaremba, Amy S. Jordan, Shiva Gautam, David P. White, and Nancy L. Chamberlin. "Differential Effects of Isoflurane and Propofol on Upper Airway Dilator Muscle Activity and Breathing." Anesthesiology 108, no. 5 (May 1, 2008): 897–906. http://dx.doi.org/10.1097/aln.0b013e31816c8a60.

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Background Anesthesia impairs upper airway integrity, but recent data suggest that low doses of some anesthetics increase upper airway dilator muscle activity, an apparent paradox. The authors sought to understand which anesthetics increase or decrease upper airway dilator muscle activity and to study the mechanisms mediating the effect. Methods The authors recorded genioglossus electromyogram, breathing, arterial blood pressure, and expiratory carbon dioxide in 58 spontaneously breathing rats at an estimated ED50 (median effective dose) of isoflurane or propofol. The authors further evaluated the dose-response relations of isoflurane under different study conditions: (1) normalization of mean arterial pressure, or end-expiratory carbon dioxide; (2) bilateral lesion of the Kölliker-Fuse nucleus; and (3) vagotomy. To evaluate whether the markedly lower inspiratory genioglossus activity during propofol could be recovered by increasing flow rate, a measure of respiratory drive, the authors performed an additional set of experiments during hypoxia or hypercapnia. Results In vagally intact rats, tonic and phasic genioglossus activity were markedly higher with isoflurane compared with propofol. Both anesthetics abolished the genioglossus negative pressure reflex. Inspiratory flow rate and anesthetic agent predicted independently phasic genioglossus activity. Isoflurane dose-dependently decreased tonic and increased phasic genioglossus activity, and increased flow rate, and its increasing effects were abolished after vagotomy. Impairment of phasic genioglossus activity during propofol anesthesia was reversed during evoked increase in respiratory drive. Conclusion Isoflurane compared with propofol anesthesia yields higher tonic and phasic genioglossus muscle activity. The level of respiratory depression rather than the level of effective anesthesia correlates closely with the airway dilator muscle function during anesthesia.
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Eikermann, Matthias, Philipp Fassbender, Sebastian Zaremba, Amy S. Jordan, Carl Rosow, Atul Malhotra, and Nancy L. Chamberlin. "Pentobarbital Dose-dependently Increases Respiratory Genioglossus Muscle Activity while Impairing Diaphragmatic Function in Anesthetized Rats." Anesthesiology 110, no. 6 (June 1, 2009): 1327–34. http://dx.doi.org/10.1097/aln.0b013e3181a16337.

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Background Anesthetics depress both ventilatory and upper airway dilator muscle activity and thus put the upper airway at risk for collapse. However, these effects are agent-dependent and may involve upper airway and diaphragm muscles to varying degrees. The authors assessed the effects of pentobarbital on upper airway dilator and respiratory pump muscle function in rats and compared these results with the effects of normal sleep. Methods Tracheostomized rats were given increasing doses of pentobarbital to produce deep sedation then light and deep anesthesia, and negative pressure airway stimuli were applied (n = 11). To compare the effects of pentobarbital with those of natural sleep, the authors chronically instrumented rats (n = 10) with genioglossus and neck electromyogram and electroencephalogram electrodes and compared genioglossus activity during wakefulness, sleep (rapid eye movement and non-rapid eye movement), and pentobarbital anesthesia. Results Pentobarbital caused a dose-dependent decrease in ventilation and in phasic diaphragmatic electromyogram by 11 +/- 0.1%, but it increased phasic genioglossus electromyogram by 23 +/- 0.2%. Natural non-rapid eye movement sleep and pentobarbital anesthesia (10 mg/kg intraperitoneally) decreased respiratory genioglossus electromyogram by 61 +/- 29% and 45 +/- 35%, respectively, and natural rapid eye movement sleep caused the greatest decrease in phasic genioglossus electromyogram (95 +/- 0.3%). Conclusions Pentobarbital in rats impairs respiratory genioglossus activity compared to the awake state, but the decrease is no greater than seen during natural sleep. During anesthesia, in the absence of pharyngeal airflow, phasic genioglossus activity is increased in a dose-dependent fashion.
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Dissertations / Theses on the topic "Genioglossus"

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Moore, Wayne Allen Jr. "Acute and Chronic Effects of Artificial Rearing on Rat Genioglossus Muscle." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/885.

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In most mammals, nutritive suckling is critical during the early neonatal period. The genioglossus (GG) muscle in rat plays an important role in protruding the tongue for efficient suckling. The purpose of this study was to examine the contractile properties and myosin heavy chain (MHC) phenotype of the GG following an early period of artificial rearing, which reduced nutritive suckling. Beginning at three days of age Sprague-Dawley rats were fed via implanted gastric cannula until postnatal day 14 (P14). At P14, artificially reared (AR) rat pups were either placed with a lactating dam until the end of the weaning period and allowed to mature until postnatal day 42 (P42), or anesthetized and prepared for physiological experimentation. GG contractile properties at P14 and P42 in AR and dam reared (DR) rats were obtained with a force transducer and digital recording system through stimulation of the medial branch of the hypoglossal nerve. Following physiological experimentation, muscle samples were removed and stored for MHC analysis. Comparisons were made between AR and DR groups at P14 and P42. At P14 maximum tetanic tension and fatigue index were lower in the AR group than the DR group and no differences were found in MHC distribution. By day 42, AR rats had a higher fatigue index that DR rats and DR rats had a higher percentage of MHCIIa than AR rats. The artificial rearing technique employed in this study was adequate to produce chronic changes in fatigue resistance and MHC distribution in GG muscle. GG muscle of premature human infants requiring early artificial feedings may develop similar changes in their contractile characteristics and MHC phenotype.
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LaCross, Amy, Peter J. Watson, and E. Fiona Bailey. "Association between Laryngeal Airway Aperture and the Discharge Rates of Genioglossus Motor Units." FRONTIERS MEDIA SA, 2017. http://hdl.handle.net/10150/622742.

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We know very little about how muscles and motor units in one region of the upper airway are impacted by adjustments in an adjacent airway region. In this case, the focus is on regulation of the expiratory airstream by the larynx and how changes in laryngeal aperture impact muscle motor unit activities downstream in the pharynx. We selected sound production as a framework for study as it requires (i) sustained expiratory airflow, (ii) laryngeal airway regulation for production of whisper and voice, and (iii) pharyngeal airway regulation for production of different vowel sounds. We used these features as the means of manipulating expiratory airflow, pharyngeal, and laryngeal airway opening to compare the effect of each on the activation of genioglossus (GG) muscle motor units in the pharynx. We show that some GG muscle motor units (a) discharge stably on expiration associated with production of vowel sounds, (b) are exquisitely sensitive to subtle alterations in laryngeal airflow, and (c) discharge at higher firing rates in high flow vs. low flow conditions even when producing the same vowel sound. Our results reveal subtle changes in GG motor unit discharge rates that correlate with changes imposed at the larynx, and which may contribute to the regulation of the expiratory airstream.
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Souza, Jaqueline Freitas de. "Relação entre a força de língua e a posição do hioide em crianças com SAOS." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/17/17151/tde-25052018-135302/.

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Objetivo: O propósito deste estudo consiste em avaliar a relação entre Força de Língua e medidas do posicionamento do hioide em crianças com diagnóstico de SAOS. Casuística e Método: Foram selecionadas crianças entre 07 e 12 anos, de ambos os gêneros, com história de roncos, apneias noturnas e respiração bucal crônica. Todas as crianças tiveram SAOS confirmada pela presença dos sintomas e pela polissonografia e foram divididas em dois grupos: pré-operatório e pós-operatório (pacientes que tinham diagnóstico de SAOS antes da adenotonsilectomia, e foram reavaliados 12 meses depois. Ambos os grupos foram submetidos à avaliação de força de língua isométrica máxima (FLIM), aplicada na posição de ponta e dorso de língua, através do dinamômetro (kgf) e por meio da radiografia lateral foi realizada avaliação craniofacial e posicionamento do hioide. Resultados: Na regressão linear em pacientes pré- operatório a medida cefalometrica D vert. H apresentou forte e significativa (p= 0,0083) relação negativa com a força em ponta de língua. Já em dorso de língua antes da cirurgia não foi significativa, para nenhuma das variáveis. Nos pacientes pós-operatório a FLIM do dorso e ponta foram significativamente (p<0,0330 e p<0,0098 respectivamente) relacionadas à medida cefalométrica C3-H. A comparação de medidas cefalométricas entre os grupos pré e pósoperatórios e entre o subgrupo residual e curados, não tiveram diferença na altura do hioide (HYS, HYMP, D Vert.H) e na relação ântero-posterior do hioide (D Horiz.H, C3-H). Em relação a FLIM da musculatura extrínseca da língua ao se compararem a média e desvio padrão nos pacientes pré e pós-operatório, observou-se que houve diferença para as medidas de força de língua (p= 0,0016 para dorso e p=0,0041 para ponta) entre eles. Não houve diferença entre os sub-grupos residual e curados. Conclusão: No presente estudo podemos concluir que existe relação entre a força do musculo lingual e a posição do osso hiode em crianças com SAOS. Ou seja, aumento na força dos músculos dilatadores da faringe pode influenciar a altura do hioide em crianças com SAOS.
Objective: The purpose of this study is to assess the relation between Force of the Tongue and measures of hyoid\'s positioning in children diagnosed with OSAS. Casuistry and Method: Were selected children between 07 and 12 years, from both genders, with snoring history, nocturnal apnea and chronic mouth breathing. All the children had OSAS confirmed by the sympton\'s presence and by the polysomnography and were divided into two groups: preoperative and postoperative (pacients that had OSAS diagnosed before the adenotonsillectomy,and were revaluated 12 months after. Both groups were submitted to maximum isometric tongue force, applied in the tip and in the back of the tongue, through the dynamometer and through the lateral radiography was performed a craniofacial evaluation and hyoid positioning. Results: In preoperative patients on linear regression the cephalometric measure D. vert. H presented strong and significant (p= 0,0083) negative relation with the tip of the tongue force. Whereas the back of the tongue before the surgery was not significant, for none of the variables. In postoperative patients the maximum isometric tongue force from the back and from the tip were significantly (p<0,0330 e p<0,0098 respectively) related to the cephalometric measure C3-H. The comparison between the cephalometric measures between the preoperative and postoperative groups and between the residual sub group and the healed ones, did not have difference in the hyoid\'s height (HYS, HYMP, D Vert.H) and on the hyoid\'s anteroposterior relation (D Horiz.H, C3-H). In regards to the maximum isometric tongue force from the extrinsic tongue musculature when compared to the average and standard deviation in patients pre and post surgery, it was noticed that there was difference for the tongue force measures (p= 0,0016 for the back and p=0,0041 for the tip) between them. There was no difference between the sub groups residual and healed. Conclusion: In the present study we can conclude that there is relation between the force of the lingual muscle and hyoid bone\'s position in children with OSAS. In other words, an increase on the pharynx dilator muscles\' strength can influence the hyoid\'s height in children with OSAS.
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Laine, Christopher. "Decoding the Language of Hypoglossal Motor Control." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/203440.

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To effect movement, the central nervous system must appropriately coordinate the activities of pools of motoneurons (MNs), the cells which control muscle fibers. Sources of neural drive are often distributed to many MNs of a pool, and thus can synchronize the activities of targeted MNs. In this thesis, synchronization among MNs is used to investigate the strength, temporal progression, and anatomical distribution of neural drive to the hypoglossal motor nucleus (HMN), which controls muscles of the tongue. The HMN is an ideal target for such an investigation because it processes a host of functionally diverse inputs, such as those related to breathing, speaking, and swallowing. Study 1 characterizes motor unit (MU) synchronization within and across bellies of the human genioglossus (GG) muscle when MUs are activated by cortical drive (during voluntary tongue protrusion) or by automatic, brainstem-mediated drive (during rest breathing). We show that voluntary tongue protrusion synchronizes MU spike timing and firing rates within but not across bellies of the GG, whereas during rest breathing, MU firing rates are moderately synchronized both within and across muscle bellies. Study 2 documents respiratory-related synchronization of MU activities in muscles of the tongue and respiratory pump using an anesthetized rat model. The results of this study indicate that upper airway and respiratory pump MN pools share a low frequency respiratory-related drive, but that higher frequency (>8 Hz) synchronization is strongest in MU pairs of the chest-wall. Finally, Study 3 examines the potential for GG multi-unit and single MU activities to be entrained by cortical input. We show that during voluntary tongue protrusion, cortical oscillations in the 15-40 Hz range weakly synchronize MU population activity, and that EEG oscillations in this range intermittently influence the spike timing of individual GG MUs. These studies are the first to characterize MU synchronization by different sources of neural input to the HMN and establish a broad foundation for further investigation of hypoglossal motor control.
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Silva, Junior Djalma Carmo Da. "Eficácia do avanço do músculo genioglosso comparado ao avanço maxilo-mandibular no tratamento da síndrome da apneia e hipopneia obstrutiva do sono : uma revisão sistemática com metanálise." Pós-Graduação em Ciências Aplicadas à Saúde, 2016. http://ri.ufs.br/jspui/handle/riufs/7210.

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The obstructive sleep apnea and hypopnea syndrome (OSAS) is characterized by repeated episodes of complete or partial interruption of the airflow as consequence of upper airway obstruction during sleep. Indications for the surgical treatment of OSAS, as well as the evidence on the efficacy and safety of the surgical techniques available merit further scientific scrutiny. Objective: To perform a systematic review on the efficacy of genioglossus advancement (GA) when compared to maxillomandibular advancement (MMA) for the treatment of patients with OSAS. Method: A systematic electronic search was conducted in the LILACS, PubMed and SciELO databases to identify studies involving patients undergoing MMA and GA for the treatment of OSAS. The guidelines presented by the PRISMA statement were followed. The eligible articles were subjectively evaluated regarding their methodological quality based on a checklist of the Critical Appraisal Skills Programme (CASP). A meta-analysis was carried out with the aid of RevMan. Results: The systematic literature search resulted in 889 records, of which 41 articles were examined for their content. After full text analysis, six studies were included in this review and allowed for inferences about the efficacy of surgical procedures at hand. Conclusion: GA showed lower treatment efficacy, as evidenced by the apnea-hypopnea index recorded by polysomnography. The results of the meta-analysis show that the MMA is superior to GA in the context of surgical treatments for OSAS.
A Síndrome da Apneia e Hipopneia Obstrutiva do Sono (SAHOS) caracteriza-se por repetidos episódios de interrupção completa ou parcial do fluxo de ar inspirado durante o sono em função da obstrução das vias aéreas superiores. Os critérios para a indicação de tratamento cirúrgico da SAHOS, bem como as evidências sobre a eficácia e segurança das técnicas cirúrgicas que impactam as vias aéreas superiores ainda merecem exploração científica adicional.Objetivo: Avaliar, por meio de uma revisão sistemática, a eficácia do avanço do músculo genioglosso (AMG) comparado ao avanço maxilo-mandibular (AMM) no tratamento de pacientes com SAHOS.Método:uma busca eletrônica sistemática foi realizada nas bases de dados LILACS, PubMed e SciELO com o intuito de identificar estudos com pacientes submetidos a cirurgia de avanço maxilo-mandibular e avanço do musculo genioglosso para o tratamento da SAHOS. A metodologia seguiu as diretrizes do PRISMA statement.Os artigos elegíveis foram avaliados subjetivamente quanto à qualidade metodológica com baseem um dos questionários do Critical Appraisal Skills Programme(CASP).Uma meta-análise dos artigos incluídos foi realizada com o auxílio do software RevMan.Resultados:A busca sistemática da literatura resultou em889 registros, dos quais 41 artigos foram examinados quanto a seu conteúdo. Depois da análise dos textos completos, seis estudos foram incluídos nesta revisão, permitindo inferências sobre a eficácia dos procedimentos cirúrgicos em questão.Conclusão:O avanço do músculo genioglosso demonstrou eficácia inferior à do avanço do músculo genioglosso, o que foi evidenciado por meio do índice de apneia hipopneia registrados através de polissonografias.Os resultados da meta-análise mostram que o AMM apresenta eficácia superior àquela doAMG no contexto do tratamento cirúrgico da SAHOS.
Lagarto, SE
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Saboisky, Julian Peter Clinical School Prince of Wales Hospital Faculty of Medicine UNSW. "Neural drive to human respiratory muscles." Publisher:University of New South Wales. Clinical School - Prince of Wales Hospital, 2008. http://handle.unsw.edu.au/1959.4/42792.

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This thesis addresses the organisation of drive to human upper airway and inspiratory pump muscles. The characterisation of single motor unit activity is important as the discharge frequency or timing of discharge of each motor unit directly reflects the output of single motoneurones. Thus, the firing properties of a population of motor units is indicative of the neural drive to the motoneurone pool. The experiments presented in Chapter 2 measured the recruitment time of five inspiratory pump muscles (diaphragm, scalene, second parasternal intercostal, and third and fifth dorsal external intercostal muscles) during normal quiet breathing and quantified the timing and magnitude of drive reaching each muscle. Chapter 3 examined the EMG activity of a major upper airway muscle (the genioglossus). The single motor units of the genioglossus display activity that can be grouped into six types based on its association or lack of association with respiration. The types of activity are termed: Inspiratory Phasic, Inspiratory Tonic, Expiratory Phasic, Expiratory Tonic, Tonic, and Tonic Other. A new method is presented in Chapter 4 to illustrate large amounts of data from single motor units recorded from respiratory muscles in a concise manner. This single figure displays for each motor unit, the recruitment time and firing frequency, the peak discharge frequency and its time, and the derecruitment time and its frequency. This method, termed the time-and-frequency plot, is used to demonstrate differences in behaviour between populations of diaphragm (Chapter 2) and genioglossus (Chapter 3) motoneurones. In Chapter 5, genioglossus activity during quiet breathing is compared between a group of patients with severe OSA and healthy control subjects. The distribution of central drive is identical between the OSA and control subjects with the same proportion of the six types of motor unit activity in both groups. However, there are alterations in the onset time of Inspiratory Phasic and Inspiratory Tonic motor units in OSA subjects and their peak discharge rates are also altered. Single motor unit action potentials in OSA subjects showed an increased area. This suggests the presence of neurogenic changes and may provide a pathophysiological explanation for the increased multiunit electromyographic activity reported in OSA subjects during wakefulness.
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Curado, Thomaz Antonio Fleury. "O efeito da modulação quimiogenética de neurônios motores do hipoglosso sobre a atividade do músculo genioglosso." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5143/tde-13062017-162234/.

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Introdução: A apneia do sono é condição prevalente e apresenta forte correlação com as principais causas de morbidade e mortalidade na sociedade ocidental. A perda do controle neuromotor proveniente de estágios mais profundos do sono está associada ao colapso faríngeo e a patogênese da apneia obstrutiva do sono (SAOS). A língua é implicada como principal protagonista na patogênese da obstrução das vias aéreas superiores (VAS) durante o sono. Não há farmacoterapia para SAOS. Novas tecnologias moleculares para controle neuronal através da inserção de um receptor de membrana geneticamente modificado, denominado Designer Receptor Exclusively Activated by Designer Drugs [DREADDs], o qual pode ser ativado por uma droga inicialmente inerte, de alta especificdade, clozapina-n-oxide (CNO). Objetivos: 1) Modificar geneticamente os neurônios motores do núcleo do hipoglosso utilizando-se de DREADDs, o qual permite regular sua atividade; 2) Analisar a atividade do músculo genioglosso sob administração de CNO; 3) Desenvolver abordagens para rastreamento dos músculos protrusores e retratores da língua por marcadores retrógrados, injecção de subunidade B de toxina colérica (CTB-AF) e do vírus de pseudoraiva (PRV) 267 transportando um gene repórter, nos músculos efetores. Métodos: Receptores muscarínicos mutados em um vetor adenoviral associado (AAV) foram infundidos no núcleo do hipoglosso de camundongos via injeção esterotáxica bilateral. Após quatro semanas, período para expressão fenotípica, foram comparadas a atividade eletromiográfica do músculo genioglosso (EMGGG) em resposta a administração de ligante (CNO) versus solução salina. Em um segundo grupo foram realizadas infusões com vírus controle e comparação da EMGGG pré e pós infusão de CNO. Para rastreamento neural a CTB-AF foi injetado nos músculos protusores e retratores da língua e para expressão de Cre o vírus PRV-267 foi injetado no músculo genioglosso. A expressão dessas substâncias no núcleo do hipoglosso foi avaliada através de microscopia de fluorescência. Resultados: Dos dezoito camundongos injetados com DREADDs, dezesseis foram transfectados pelo vetor de AAV. Em camundongos onde o núcleo motor do hipoglosso foi corretamente atingido a EMGGG apresentou importante aumento após a administração de CNO. Em contraste, a atividade do genioglosso não apresentou alteração após a administração de soro fisiológico. Em três camundongos onde a transfecção ultrapassou os limites do núcleo foi observado arritmia respiratória após infusão do ligante. Todos animais infundidos com vírus controle foram adequadamente transfectados mas não apresentaram alteração eletromiográfica após a infusão de CNO. Foram diferenciados no núcleo do hipoglosso os neurônios motores da musculatura retratora e protusora da língua. A expressão intranuclear da enzima Cre-recombinase foi identificada no núcleo hipoglosso. Conclusão: A utilização de métodos quimiogenéticos para ativar grupos selecionados de neurônios motores em áreas cerebrais específicas representa técnica promissora para o estudo do controle neuromotor das VAS. Estes resultados sugerem que a terapia transgênica pode ser eficaz no tratamento da SAOS além de uma vasta gama de patologias que resultam de perturbações no controle neural das VAS. Através da manipulação das fibras musculares efetoras na língua foi possível a identificação do seu respectivo neurônio motor no núcleo do hipoglosso e induzi-lo a sintetizar uma enzima específica (Cre-recombinase)
Introduction: Sleep Apnea is a prevalent condition and strongly correlates with the major causes of morbidity and mortality in Western Society. The loss of motor input from deeper sleep stages is associated with pharyngeal collapsibility and the pathogenesis of obstructive sleep apnea (OSA). The tongue plays a major role in the pathogenesis of upper airway (UA) obstruction during sleep. There is no pharmacotherapy for OSA. New molecular techniques allow to control neuronal function by inserting a genetically modified membrane receptor termed the Designer Receptor Exclusively Activated by Designer Drugs [DREADDs] which can be activated by a highly specific and otherwise pharmacologically inert drug clozapine-N-oxide (CNO) Objectives: 1) To genetically modify the hypoglossal nucleus motor neurons using DREADDs, which allows to regulate their activity; 2) To analyze the genioglossal activity upon administration of CNO; 3) to develop novel approaches to targeting tongue protruders and retractors by retrograde tracers, cholera toxin subunit B (CTB-AF) and pseudorabies virus (PRV) 267 injection carrying a reporter gene into the effector muscles. Methods: Mutated muscarinic receptors in an adenoviral associated vector (AAV) were delivered to the hypoglossal nucleus via stereotactically bilateral injection. Four weeks after adenoviral delivery (expression period), responses in genioglossal electromyography (EMGGG) activity to intraperitoneal administration of CNO ligand vs. Saline (control) were compared in mice. In a second group, control-virus was infused and genioglossus muscle EMGGG was compared before and after CNO infusion. For neuronal tracing CTB-AF was injected into the protrusor and retractor muscles of the tongue and for Cre induction PRV-267 virus was injected in the genioglossus muscle. Expression of these substances in the hypoglossal nucleus were evaluated by fluorescence histology. Results: Of eighteen DREADDs injected mice, sixteen were transfected with AAV vector. After CNO administration EMGGG activity increased in mice where the hypoglossal motor nucleus was correctly targeted. In contrast, genioglossal activity was not augmented following saline administration. In three mice where transfection surpassed the nucleus limits, breathing arrhythmia was observed following ligand infusion. All animals infused with control virus were adequately transfected but did not present electromyographic change following CNO infusion. The motor neurons of the rectractor and protrusor musculature of the tongue were well differentiated in the hypoglossal nucleus. Intranuclear expression of Cre recombinase enzyme was identified in the hypoglossal nucleus. Conclusion: Utilizing chemogenetic methods to activate motor neuron groups in selected brain areas show promise to UA neuromotor control, and suggest that transgenic therapy may be effective in treating OSA and a wide range of pathologies that result in disturbances of UA neural control. By manipulating the effector muscle fibers of the tongue, it was possible to identify its respective motor neuron in the hypoglossal nucleus and to induce synthesis of a specific enzyme (Cre recombinase)
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Foltán, René. "Genioglossus advancement v chirurgické terapii obstrukčního spánkového apnoického syndromu." Doctoral thesis, 2007. http://www.nusl.cz/ntk/nusl-288576.

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In the thesis the author deals with the surgical technique of the genioglossus advancement and hyoid myotomy (GAHM) in the obstructive sleep apnoea syndrome (OSAS) therapy. He focuses in particular on methods used to widen the upper airway by surgical modification of facial bones. Following the definition of the research objective in Chapter 1 and the general introduction in Chapter 2, we can find in Chapter 3 the description and definition of OSAS as well as physiological, pathophysiological and epidemiological notes on sleep, ventilation in sleep and OSAS. In Chapter 4 the author recommends some new methods of examining the upper airway that can be applied in an ordinary dental surgery to predict the risk of development or occurrence of OSAS in some patients. Chapter 5 includes an overview of therapeutic options for OSAS and a detailed description of different GAHM techniques. In accordance with the research objectives and the methodology described in Chapter 6, the results in Chapter 7 show, for a large sample of examined patients, the dependence of obesity (as expressed by the BMI) on the severity of OSAS, along with some cephalometric values in which such dependence has not been published so far. Then the chapter documents a high success rate of GAHM treatment of OSAS in operated patients. This is so,...
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Moore, Wayne Allen. "Acute and chronic effects of artificial rearing on rat genioglossus muscle /." 2005. http://hdl.handle.net/10156/1544.

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Park, Eileen. "Sedatives may suppress arousal while allowing greater genioglossus activity during sleep." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=450599&T=F.

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Books on the topic "Genioglossus"

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Park, Eileen. Sedatives may suppress arousal while allowing greater genioglossus activity during sleep. 2006.

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Aoki, Cynthia R. A. Activating the cAMP-PKA pathway modulates genioglossus muscle and responses to excitatory inputs. 2005.

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Sood, Sandeep Kumar. Serotonergic neuromodulation of hypoglossal motor output to genioglossus muscle studied by in-vivo microdialysis. 2006.

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Steenland, Hendrick William. Respiratory activation of the genioglossus muscle involves both non-NMDA and NMDA glutamate receptors at the hypoglossal motor nucleus in-vivo. 2005.

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Book chapters on the topic "Genioglossus"

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Joy, Reju, and Sharon Aronovich. "Genioglossus Advancement." In Modern Management of Obstructive Sleep Apnea, 75–88. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11443-5_8.

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Horner, Richard L. "Control of Genioglossus Muscle by Sleep State-Dependent Neuromodulators." In Integration in Respiratory Control, 262–67. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-73693-8_46.

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Tadjalli, Arash, James Duffin, and John Peever. "Repeated Obstructive Apneas Induce Long-term Facilitation of Genioglossus Muscle Tone." In Advances in Experimental Medicine and Biology, 297–301. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-1-4419-5692-7_61.

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Edge, Deirdre, Aidan Bradford, James F. X. Jones, and Ken D. O’Halloran. "Chronic Intermittent Hypoxia Alters Genioglossus Motor Unit Discharge Patterns in the Anaesthetized Rat." In Advances in Experimental Medicine and Biology, 295–300. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4584-1_40.

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Dewald, Denise, and Kingman P. Strohl. "Mechanical Properties, Anatomy, and Control of the Upper Airway." In Upper Airway Stimulation Therapy for Obstructive Sleep Apnea, 27–64. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780197521625.003.0003.

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The physiology of the upper airway is fundamental to current and trending therapy for obstructive sleep apnea and neurostimulation in particular. Proper functioning of the upper airway will promote sleep health by supporting the requisite airflow without snoring or significant flow limitation. Dysfunction produces snoring, obstructive hypopneas, and the metabolic sequelae of sleep disordered breathing. How a particular section of the upper airway (e.g., velopharynx, oropharynx, or hypopharynx) remains open while it is suspended from the skull base, maxilla, and mandible is the result of anatomy and neuromuscular control. The genioglossus muscle, originally designed for bringing food into the mouth and swallowing, along with multiple other muscles, participates in the maintenance of patency of the muscular pharynx during wakefulness and sleep. If the genioglossus were the only muscle important for airway stability, then hypoglossal nerve stimulation would likely be universally rather than selectively effective; instead, its effectiveness is predicted by velopharyngeal functions, which in terms of sleep health are poorly described. Literature clearly indicates a fundamental role for muscles other than the genioglossus in maintaining airway diameter, shape, and wall stiffness. Models that incorporate a more complete neuromechanical coupling of these components are necessary to understand a stable airway during sleep and helpful for decisions in management of obstructive sleep apnea.
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Brietzke, Scott E., and Holly Rataiczak. "Genioglossus Advancement in Sleep Apnea Surgery." In Sleep Apnea and Snoring, 303–4. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-323-44339-5.00052-3.

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Li, Kasey K. "Genioglossus advancement in sleep apnea surgery." In Sleep Apnea and Snoring, 301–4. Elsevier, 2009. http://dx.doi.org/10.1016/b978-1-4160-3112-3.00048-6.

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Sato, Takako, Ryota Nakamura, Akio Himejima, Akemi Kusano, Serim Kang, Saori Ohtani, Kentarou Yamada, et al. "The Effects of Maxillomandibular Advancement and Genioglossus Advancement on Sleep Quality." In Maxillofacial Surgery and Craniofacial Deformity - Practices and Updates. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.89296.

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Goh, Yau Hong, Winston Tan, Victor James Abdullah, and Sung Wan Kim. "Advances in Box Surgery for Obstructive Sleep Apnea: Genioglossus Advancement, Hyoid Suspension, and Maxillomandibular Advancement." In Sleep-Related Breathing Disorders, 99–108. S. Karger AG, 2017. http://dx.doi.org/10.1159/000470873.

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Edge, Deirdre, Fiona B. McDonald, James F. X. Jones, Aidan Bradford, and Ken D. O’Halloran. "Effect of Chronic Intermittent Hypoxia on the Reflex Recruitment of the Genioglossus During Airway Obstruction in the Anesthetized Rat." In Progress in Brain Research, 147–68. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-444-63274-6.00008-4.

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Conference papers on the topic "Genioglossus"

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Eckert, Danny J., Salonee Parikh, David P. White, Amy S. Jordan, Pankaj Merchia, and Atul Malhotra. "Sleep Deprivation Impairs Genioglossus Muscle Responsiveness." In American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado. American Thoracic Society, 2011. http://dx.doi.org/10.1164/ajrccm-conference.2011.183.1_meetingabstracts.a6163.

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Jordan, A., C. L. Nicholas, J. Avraam, A. Dawson, T. Thornton, A. Kay, P. Jia, et al. "Motor Control of the Genioglossus During After Discharge." In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a6442.

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Gandevia, Simon C., Benjamin C. Kwan, Jane E. Butler, Anna L. Hudson, and Lynne E. Bilston. "Ultrasound Imaging Of Genioglossus Muscle Movement During Quiet Breathing." In American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado. American Thoracic Society, 2011. http://dx.doi.org/10.1164/ajrccm-conference.2011.183.1_meetingabstracts.a6164.

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Chua, E. C. P., D. G. McSharry, W. T. McNicholas, and M. M. Lowery. "Towards a genioglossus surface EMG model of obstructive sleep apnea." In 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2009. http://dx.doi.org/10.1109/iembs.2009.5332517.

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Zhang, Xilong, Hanpeng Huang, and Xiaofeng Zhang. "Adiponectin can improve chronic intermittent hypoxia induced genioglossus contractile dysfunction." In ERS International Congress 2016 abstracts. European Respiratory Society, 2016. http://dx.doi.org/10.1183/13993003.congress-2016.pa2289.

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Saboisky, JP, S. Nandedkar, DJ Eckert, AS Jordan, WS David, M. Ali, DP White, JA Trinder, CL Nicholas, and A. Malhotra. "The Selective Examination of Genioglossus (GG) Muscle Fiber Density (FD)." In American Thoracic Society 2009 International Conference, May 15-20, 2009 • San Diego, California. American Thoracic Society, 2009. http://dx.doi.org/10.1164/ajrccm-conference.2009.179.1_meetingabstracts.a4214.

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Zou, Ying, and Wei Wang. "Chronic intermittent hypoxia induces the long-term facilitation of genioglossus corticomotor activity." In ERS International Congress 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/1393003.congress-2017.pa2969.

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Jordan, AS, A. Wellman, DJ Eckert, KE Stevenson, L. Hess, A. Malhotra, and DP White. "The Effectiveness of Genioglossus Muscle Contraction in Patients with and without OSA." In American Thoracic Society 2009 International Conference, May 15-20, 2009 • San Diego, California. American Thoracic Society, 2009. http://dx.doi.org/10.1164/ajrccm-conference.2009.179.1_meetingabstracts.a3599.

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Morelli, Deanna L., Nicholas Jackson, Andrew M. Kim, Eugenia L. Chan, Cary Bearn, and Richard J. Schwab. "Genioglossus Strength Before And After Weight Loss In Obstructive Sleep Apnea (OSA)." In American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California. American Thoracic Society, 2012. http://dx.doi.org/10.1164/ajrccm-conference.2012.185.1_meetingabstracts.a2443.

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Younes, Magdy, Andrea Loewen, Michele Ostrowski, John Laprairie, Frances Maturino, and Patrick Hanly. "Short Term Potentiation (STP) Of Genioglossus Activity In Patients With Obstructive Apnea (OSA)." In American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado. American Thoracic Society, 2011. http://dx.doi.org/10.1164/ajrccm-conference.2011.183.1_meetingabstracts.a6162.

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