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Relación de los potenciales evocados auditivos de media latencia y bostezo
Anías Calderón,José; Chao González,Susana; Potrillé Moore,Rosa María;
Revista Cubana de Investigaciones Biom??dicas , 2006,
Abstract: the changes produced by yawning in the middle latency auditory evoked potentials were observed to know more about the generation of this conduct. to this end, the middle latency auditory evoked potentials of 10 sound male adults were registered under the control conditions and immediately before and after yawning. the results showed a marked increase of the amplitude of the pa wave after yawning. this allowed to determine the decisive participation of the encephalic trunk in the generation of the yawn and its endogenous nature.
Dosis óptimas para la inducción del bostezo con apomorfina en el humano sano
Anías Calderón,José M; Osa Palacio,Jorge Luis de la;
Revista Cubana de Investigaciones Biom??dicas , 1999,
Abstract: the effect of the subcutaneous administration of 4, 6, 8, 10, 12, 14 ?g of apomorphine in 16 volunteer sound individuals was studied aimed at finding the optimal dose for the induction of yawning in the healthy human. the subjects were divided into 2 subgroups of 8 to give cach of them only 3 doses. they were administered physiological saline to study the spontaneous yawning (control situation). the results show that the range from 8 to 10 ?g is the most suitable for the induction of yawning. the lower doses had little inducing effect, whereas higher doses produced undesirable effects.
Bostezo
Muchnik,S.; Finkielman,S.; Seemeniuk,G.; de Aguirre,M. I.;
Medicina (Buenos Aires) , 2003,
Abstract: yawning is a normal reflex triggered by arousal, drowsiness, boredom, hunger and emotional conditions and it is associated to several neurological diseases and drug abuse. its wide presence in the phylogenetic vertebrate scale and even in human fetuses as young as 12 weeks directed the search for the common anatomic and biochemical mechanisms involved. the demonstration that yawning is not connected with high co2 or low o2 blood levels left aside a prevalent metabolic hypothesis. its close relationship with the sleep-wake cycle, specially in moments previous to falling asleep and after awaking has been related to changes in personal situation and activity. a single component of this reflex which is to be found exclusively in humans, is the fact that yawning is contagious. thus, it is considered a component of the adaptative mechanism that is part of the surveillance reflex, becoming a significant paralinguistic evolutive expression aimed at protection and social cohesion. the common anatomical structures and neurochemical systems taking part in yawning, the sleep-wake cycle and the temporal lobe epilepsy may imply that yawning results from a set of protective systems induced by endogenous opiods which intervene in the inhibition and prevention of the temporal lobe epileptic seizures
Why do we yawn?  [PDF]
William Burke
Health (Health) , 2013, DOI: 10.4236/health.2013.510213
Abstract:

The biomedical hypothesis proposed here is that the immediate trigger for a yawn is a restricted collapse of a few alveoli in the lungs. The extent of this alveolar collapse may be too small for it to be detected by current X-ray technology, but this technology is continually improving and may soon be good enough to test the hypothesis. In support of the hypothesis, it is shown that yawning can be inhibited by deep breaths of air, nitrogen or carbogen, thus showing that yawning is not triggered by lack of oxygen or by excess carbon dioxide, leaving alveolar collapse as the most likely possibility. A more extensive form of alveolar collapse is termed atelectasis and this involves a serious state of hypoxia which, if deepened or prolonged, can be fatal. Therefore, if the hypothesis is correct, yawning may prevent the development of atelectasis and save lives. This paper is not concerned with other indirect ways in which yawning may be induced, nor with the mechanism and neural circuitry of the yawn, nor with social aspects of yawning, only with the immediate trigger. My aim is to get better evidence for the hypothesis put forward here and also to study the behaviour of the pulmonary alveoli in normal respiration.

Development of Fetal Yawn Compared with Non-Yawn Mouth Openings from 24–36 Weeks Gestation  [PDF]
Nadja Reissland, Brian Francis, James Mason
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050569
Abstract: Background Although some research suggests that fetuses yawn, others disagree arguing that is it simple mouth opening. Furthermore there is no developmental account of fetal yawning compared with simple mouth opening. The aim of the present study was to establish in a repeated measures design the development of fetal yawning compared with simple mouth opening. Methodology/Findings Video recordings were made of the fetal face and upper torso visualized by means of 4D full frontal or facial profile ultrasound recordings. Fifteen healthy fetuses were scanned four times at 24, 28, 32 and 36 weeks gestation. Yawning was distinguished from non-yawning in terms of the length of time it took to reach the apex of the mouth stretch, with yawns being defined as more than 50% of the total time observed. To assess changes in frequency, a Poisson mixed effects model was fitted to the count of number of yawn and simple mouth opening events with age and gender as fixed effects, and person as a random effect. For both yawns and simple mouth openings a smooth varying age effect was significant. The number of yawns observed declined with age from 28 weeks gestation, whereas simple mouth openings were less frequent and the decline was observed from 24 weeks. Gender was not significant either for yawn and simple mouth openings. Conclusions/Significance Yawning can be reliably distinguished from other forms of mouth opening with the potential of using yawning as an index of fetal healthy development.
Bostezo y epilepsia del lóbulo temporal
Muchnik,S.; Finkielman,S.; Semeniuk,G.; De Aguirre,M. I.;
Medicina (Buenos Aires) , 2003,
Abstract: temporal lobe epilepsy is a partial epileptic disorder in which mesial structures are responsible for the principal ictal symptoms. its characteristic feature is the recurrence of simple and complex partial seizures, associated with postictal confusion and amnesia of the event. the facilitating effect of nrem sleep on the propagation of the seizure, as well as the sleep abnormalities provoked by epilepsy were evident in our two patients. yawning is a physiological reflex induced by arousal and drowsiness and may appear in different neurological conditions. its relation with epilepsy of limbic origen has been rarely reported. we describe in a 95 year old male patient, the occurrence of yawning followed by complex partial seizure during a state of drowsiness. his eeg showed independent bilateral interictal foci of temporal sharp waves and after being medicated with carbamazepine 400mg/day, the episode did not recur. another patient, a 17 year old female, displayed complex partial seizures and secondarily generalized seizures with yawning during the posictal period, after naps. the eeg was normal and her polysomnography showed bilateral synchronous temporal spikes and slow waves with secondarily generalization during stage 2 of nrem sleep that produce paroxysmal microarousals and increased stages 1 and 2 of nrem sleep and rem sleep diminished. after being medicated with divalproex sodium 750 mg/day, she suffered no futher seizures. temporal lobe epilepsy, sleep- wake cycles and yawning seem not only to share the same anatomic structures but also the same neurochemical mechanisms. the fact that endogenous opiods are considered as part of a protective system that stop and prevent seizures may allow us to postulate that yawning would be the expression of the endogenous opiods induced mechanisms that stop and prevent the recurrence of the temporal lobe epilepsy. another hypothesis may be that this is only a particular form of temporal lobe epilepsy.
Relación de los potenciales evocados auditivos de media latencia y bostezo Relation between the middle latency auditory evoked potentials and yawn  [cached]
José Anías Calderón,Susana Chao González,Rosa María Potrillé Moore
Revista Cubana de Investigaciones Biom??dicas , 2006,
Abstract: Se observó qué cambios produciría el bostezo en los potenciales evocados auditivos de media latencia y así conocer más sobre la generación de esa conducta. Para llevar a cabo esto se registraron los potenciales evocados auditivos de media latencia de 10 hombres, adultos sanos, en las condiciones de control e inmediatamente antes y después del bostezo. Los resultados obtenidos mostraron un incremento significativo de la amplitud de la onda Pa después del bostezo. Esto permitió concluir la participación decisiva del tronco encefálico en la generación del bostezo y su naturaleza endógena. The changes produced by yawning in the middle latency auditory evoked potentials were observed to know more about the generation of this conduct. To this end, the middle latency auditory evoked potentials of 10 sound male adults were registered under the control conditions and immediately before and after yawning. The results showed a marked increase of the amplitude of the Pa wave after yawning. This allowed to determine the decisive participation of the encephalic trunk in the generation of the yawn and its endogenous nature.
EL BOSTEZO INDUCIDO POR APOMORFINA EN RATAS ALCOHOLIZADAS EN PERIODO DE ABSTINENCIA: EVIDENCIAS DE UN MECANISMO DOPAMINERGICO POSTSINAPTICO
Hernández Darias,Alain; Santana Felipe,Ariel;
Revista Habanera de Ciencias M??dicas , 2008,
Abstract: there are two theories to explain the apomorphine induced yawning: the pre synaptic one and the post synaptic one. alcoholic abstinence may provide evidence of the second one considering the dopaminergic hypersensitivity that it causes. wister alcoholic rats were deprived of alcohol and the apomorphine test was performed during abstinence. the same procedure was performed on non alcoholic rats. media rate of the apomorphine group was higher than in the rest. those treated with apomorphine and treated with placebo showed similar records. we consider that apomorphine acts with hypersensitive postsynaptic receptors due to alcoholic abstinence and not because of auto receptors inhibiting dopamine liberation, given that hypersensitivity is increased in abstinent groups because of the inhibition of dopamine liberation, and according to the first theory, the group treated with placebo, should have showed a larger number of yawning than the rest.
Síncope cardíaca reflexa por "nevralgia" do glossofaríngeo: rara apresenta??o dessa doen?a
Korkes, Helio;Oliveira, Eduardo Mesquita de;Brollo, Luigi;Hachul, Denise Tessariol;Andrade, José Carlos da Silva;Peres, Mario Fernando Prieto;Schubsky, Victor;
Arquivos Brasileiros de Cardiologia , 2006, DOI: 10.1590/S0066-782X2006001800025
Abstract: the first description of severe pain in the distribution of the glossopharyngeal nerve is credited to weisenberg, in 19101, in a patient with cerebellopontine angle tumor. however, it was harris, in 19262, who coined the term glossopharyngeal neuralgia to describe this rare condition characterized by paroxysms of excruciating pain located laterally at the back of the tongue, soft palate, throat, and lateral and posterior pharynx, radiating to the ear. swallowing, coughing, yawning or chewing may trigger pain, which usually lasts from seconds to minutes. the association between glossopharyngeal neuralgia and syncope is very rare, being identified by brief episodes of bradycardia, asystole, and hypotension. such an association, with this same pathophysiology, was first described by riley et al3 in 1942.
Dosis óptimas para la inducción del bostezo con apomorfina en el humano sano  [cached]
José M Anías Calderón,Jorge Luis de la Osa Palacio
Revista Cubana de Investigaciones Biom??dicas , 1999,
Abstract: Se estudió el efecto de la administración subcutánea de 4, 6, 8, 10, 12, 14 m g de apo-morfina en 16 hombres voluntarios sanos, con el objetivo de encontrar las dosis óptimas para la inducción del bostezo en el humano sano. Se dividieron en 2 subgrupos de 8 para administrarles a cada grupo sólo 3 dosis. A todos se les administró suero fisiológico para estudiar el bostezo espontáneo (situación control). Los resultados demuestran que el rango de 8 a 10 m g es el más adecuado para la inducción del bostezo. Las dosis inferiores tuvieron poco efecto inductor, las dosis superiores produjeron efectos indeseables. The effect of the subcutaneous administration of 4, 6, 8, 10, 12, 14 ?g of apomorphine in 16 volunteer sound individuals was studied aimed at finding the optimal dose for the induction of yawning in the healthy human. The subjects were divided into 2 subgroups of 8 to give cach of them only 3 doses. They were administered physiological saline to study the spontaneous yawning (control situation). The results show that the range from 8 to 10 ?g is the most suitable for the induction of yawning. The lower doses had little inducing effect, whereas higher doses produced undesirable effects.
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