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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Apnea, small for date and autonomic imbalance - risk factors in relation to SIDS /

Edner, Ann, January 2003 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 5 uppsatser.
112

Fear of faces a psychophysiological investigation of facial affect processing in social phobia /

Horley, R. Kaye. January 2004 (has links)
Thesis (Ph.D.)--University of Wollongong, 2004. / Typescript. Includes bibliographical references: p. 239-266.
113

Autonomic reactivity in muscle pain : clinical and experimental assessment /

Kalezić, Nebojša, January 2006 (has links)
Diss. (sammanfattning) Umeå : Univ., 2006. / Härtill 6 uppsatser.
114

Functional neuroanatomy of tachykinins in brainstem autonomic regulation

Makeham, John M. January 2006 (has links)
Thesis (Ph. D.)--University of Sydney, 2007. / Title from title screen (viewed 1 November 2007). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Discipline of Physiology, Faculty of Medicine. Degree awarded 2007 ; thesis submitted 2006. Bibliography: leaves 239-284. Also issued in print.
115

Cardiovascular autonomic modulation following maximal exercise Its relationship to race, VO2max, and resting heart rate variability /

Esco, Michael R. Blessing, Daniel L., January 2009 (has links)
Thesis (Ph. D.)--Auburn University. / Abstract. Includes bibliographical references.
116

Drugs and autonomic conditioning; the effects of amphetamine and chlorpromazine on the simultaneous conditioning of pupillary and electrodermal response elements.

Dureman, Ingmar. January 1900 (has links)
Thesis--Uppsala. / Without thesis statement. Bibliography: p. [152]-162.
117

Drugs and autonomic conditioning; the effects of amphetamine and chlorpromazine on the simultaneous conditioning of pupillary and electrodermal response elements.

Dureman, Ingmar. January 1900 (has links)
Thesis--Uppsala. / Without thesis statement. Bibliography: p. [152]-162.
118

An electrophysiological study of vagal reflex pathways activated by upper gastrointestinal stimuli

Partosoedarso, Elita Roosi. January 1998 (has links) (PDF)
Additional appendix (5 p.) is pasted onto back end-paper. Bibliography: leaves 219-244. Investigates the complexity of the vagal reflexes arising from the upper gastrointestinal tract by recording single unit vagal afferents and efferents in the ferret. The potential involvement of various neurotransmitters in mediating and modulating gastrointestinal tract inputs is also explored.
119

Efeitos da deglutição de esforço sobre a modulação da frequência cardíaca em indivíduos com disfagia orofaríngea neurogênica / Effects of effortful swallow on modulation of heart rate modulation in individuals with neurogenic orofaringeal dysphagia

Gomes, Livia Maria Silva [UNESP] 04 June 2018 (has links)
Submitted by Livia Maria Silva Gomes (livia_sgomes@hotmail.com) on 2018-07-02T16:52:24Z No. of bitstreams: 1 Dissertacao_Defesa_Mestrado_ Livia_Gomes 02-07-2018.pdf: 1030259 bytes, checksum: 49dd1a96cea772d6ee1832593076c536 (MD5) / Approved for entry into archive by Telma Jaqueline Dias Silveira null (telmasbl@marilia.unesp.br) on 2018-07-02T19:22:11Z (GMT) No. of bitstreams: 1 gomes_lms_me_mar.pdf: 1030259 bytes, checksum: 49dd1a96cea772d6ee1832593076c536 (MD5) / Made available in DSpace on 2018-07-02T19:22:11Z (GMT). No. of bitstreams: 1 gomes_lms_me_mar.pdf: 1030259 bytes, checksum: 49dd1a96cea772d6ee1832593076c536 (MD5) Previous issue date: 2018-06-04 / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Introdução: A busca por evidências para a reabilitação e o uso de técnicas terapêuticas aplicadas às disfagias orofaríngeas neurogênicas tornou-se fator determinante na elaboração dos programas de reabilitação. A manobra de deglutição de esforço tem sido frequentemente estudada, porém uma das questões ainda não esclarecidas em indivíduos com disfagia orofaríngea trata da sobrecarga cardíaca proveniente da execução de esforço. Objetivo: Comparar os efeitos da deglutição espontânea e da manobra de deglutição de esforço sobre a modulação da frequência cardíaca em indivíduos com disfagia orofaríngea neurogênica. Método: O estudo foi realizado em 23 indivíduos com disfagia orofaríngea neurogênica, 8 indivíduos pós Acidente Vascular Cerebral e 15 com Doença de Parkinson, ambos os sexos e idade entre 50 e 90 anos (média de idade de 67 anos). O protocolo constou de duas etapas onde foram analisados os índices lineares da variabilidade da frequência cardíaca durante 5 minutos em cada protocolo: 1) deglutição espontânea e; 2) deglutição de esforço monitorada por eletromiografia de superfície durante todo o protocolo com variação de 5,25% na ativação muscular durante a deglutição de esforço (p=0,009). Resultados: Não houve diferença estatisticamente significativa nos índices da variabilidade da frequência cardíaca durante o protocolo de deglutição de esforço comparado com a degutição espontânea do indivíduo da amostra estudada (RMSSD p= 0,3; LF (ms²) p= 0,3; SD1 p= 0,3). Conclusão: O esforço muscular executado durante a manobra de deglutição de esforço nos indivíduos com disfagia orofaríngea neurogênica dessa amostra não alterou a modulação autonômica cardíaca dos indivíduos. / Introduction: The search for evidence for rehabilitation and the use of therapeutic techniques applied to neurogenic oropharyngeal dysphagia has become a determining factor in the design of rehabilitation programs. The effort swallowing maneuver has been frequently studied, but one of the questions still not clarified in individuals with oropharyngeal dysphagia treats the cardiac overload from the execution of effort. Objective: To compare the effects of spontaneous deglutition and effort swallowing maneuver on heart rate modulation in individuals with neurogenic oropharyngeal dysphagia. Methods: The study was performed in 23 individuals with neurogenic oropharyngeal dysphagia, diagnosed with neurological diseases, aged between 50 and 90 years (mean age 67 years), in both sexes. We analyzed groups of individuals after stroke (N = 8) and with Parkinson's Disease (N = 15). The protocol consisted of two steps in which the linear indexes of the heart rate variability during 5 minutes in each protocol were analyzed: 1) spontaneous deglutition and; 2) effortful swallow, monitored by surface electromyography throughout the protocol with variation of 5.25% in muscle activation during effort swallowing (p = 0.009). Results: There was no statistically significant difference in the indices of heart rate variability during the effort swallowing protocol. Conclusion: The muscular effort performed during the maneuver of effort swallowing in individuals with neurogenic oropharyngeal dysphagia of this sample did not alter the autonomic cardiac modulation of the individuals. / FAPESP: 2016/04665-5
120

Efeitos hemodinâmicos e autonômicos da ingestão aguda de água em indivíduos hipertensos

Callegaro, Carine Cristina January 2004 (has links)
INTRODUÇÃO. A ingestão aguda de 500 ml de água pode elevar a pressão arterial de forma expressiva em indivíduos com disfunção autonômica, mas parece não afetar os níveis pressóricos de indivíduos jovens saudáveis. Na hipertensão arterial sistêmica podem ocorrer alterações na modulação autonômica e, em ratos hipertensos, há evidências de que a ingestão de água seja capaz de promover aumento da pressão arterial. Entretanto, em seres humanos hipertensos, os efeitos da ingestão aguda de água ainda não são conhecidos. OBJETIVOS. Avaliar os efeitos hemodinâmicos e autonômicos da ingestão aguda de água em indivíduos portadores de hipertensão arterial sistêmica, bem como investigar os mecanismos fisiológicos envolvidos na resposta pressora. MÉTODOS. Participaram do estudo 8 indivíduos portadores de hipertensão arterial sistêmica leve (idade = 42,5±7,8 anos; índice de massa corporal= 27,1±3,4 kg/cm2) e 10 indivíduos normotensos (idade = 37,3±7,5 anos; índice de massa corporal = 25,8±3,2 kg/cm2), os quais foram submetidos à ingestão de 500 ml de água após repouso na posição supina por 30 minutos. Foram avaliadas a pressão arterial (Finapress, Ohmeda), a freqüência cardíaca, o fluxo sangüíneo do antebraço, a resistência vascular do antebraço e a atividade nervosa simpática muscular no basal e aos 10, 20 e 30 minutos após a ingestão de água. Amostras sangüíneas venosas foram coletadas no basal e aos 10 e 30 minutos após a ingestão de água, para calcular as mudanças no volume plasmático. A variabilidade da pressão arterial sistólica e da freqüência cardíaca foi avaliada por análise espectral, utilizando-se a Transformação Rápida de Fourier. RESULTADOS. A ingestão de água resultou em significativo aumento máximo das pressões arteriais sistólica (Hipertensos = 19±7 mmHg; Normotensos = 17±7 mmHg, p = 0,001) e diastólica (Hipertensos = 14±4 mmHg; Normotensos = 14±5 mmHg, p = 0,001) nos indivíduos hipertensos e normotensos. Ambos os grupos também apresentaram significativa elevação máxima da resistência vascular no antebraço (Hipertensos = 19±11 unidades; Normotensos = 20±13 unidades, p = 0,001) e da atividade nervosa simpática muscular (Hipertensos = 8±2 disparos/min; Normotensos = 8±4 disparos/min, p = 0,001). RESULTADOS. Após a ingestão de água, houve redução da freqüência cardíaca (Hipertensos = - 5,6±2,1 bat/min; Normotensos = - 5,4±7,3 bat/min, p = 0,002), do fluxo sangüíneo no antebraço (Hipertensos = - 0,5±0,4 ml/min/100 ml tecidual; Normotensos = - 0,7±0,6 ml/min/100 ml tecidual, p = 0,001) e do volume plasmático (Hipertensos = - 0,8±0,8 %; Normotensos = - 1,0±0,9%, p = 0,002) nos indivíduos hipertensos e normotensos. A variabilidade da freqüência cardíaca e da pressão arterial sistólica não foi alterada pela ingestão de água. CONCLUSÃO. A ingestão aguda de água eleva similarmente as pressões arteriais sistólica e diastólica de indivíduos hipertensos leves e normotensos, provavelmente por aumento da resistência vascular periférica, secundário à ativação simpática. / Introduction. An acute water ingestion of 500 ml may significantly increase blood pressure in individuals with autonomic dysfunction. However, it doesn’t seem to influence the pressure levels of young, healthy subjects. When a systemic arterial hypertension is present, alterations can occur in the autonomic modulation mechanism, and there is scientific evidence that acute water drinking is responsible for increases in the arterial blood pressure of laboratory rats with hypertension. However, in human subjects with hypertension, the effects of an acute water ingestion are not yet well known. Objectives. The current study aims to evaluate haemodynamics and autonomic response to acute water ingestion in human subjects that have systemic arterial hypertension, as well as to study the physiological mechanisms underlying in the pressure elevation phenomena. Method. The human subjects that participated were divided up into two study groups. The first group of eight subjects, had been diagnosed with stage I systemic hypertension (ages = 42.5±7.8 years; with a body mass index = 27.1±3.4 kg/cm2), and the second group consisted of 10 subjects that had normal pressure readings (ages = 37.3±7.5 years; with a body mass index equivalent to 25.8±3.2 kg/cm2). All participants had drunk 500ml of water, after resting for 30 minutes in the supine position. The following parameters were studied: arterial blood pressure (Finapress, Ohmeda), heart rate, forearm blood flow, forearm vascular resistance and basal muscle sympathetic nerve activity after 10, 20, and 30 minutes, immediately following the acute water ingestion. Venous blood samples were collected during the basal period of 10 and 30 minutes after water drinking, in order to calculate plasmatic volume changes. Systolic pressure and heart rate variability were evaluated by spectral analysis, utilizing the Fast Fourier Transform. Results. There was a significant maximum increase in systolic and diastolic arterial pressure, in both, hypertensive and normotensive human subjects, as a direct consequence of acute water ingestion. Systolic pressure increase was of 19±7 mmHg, in hypertensive subjects; while the same pressure increase was of 17±7 mmHg, for normotensive subjects, (p = 0.001). Similarly, the diastolic pressure increase in hypertensive subjects had an equivalent to 14±4 mmHg, and in normotensive subjects showed an increase equivalent to 14±5 mmHg, (p = 0.001). Similarly, the diastolic pressure increase in hypertensive subjects had an equivalent to 14±4 mmHg, and in normotensive subjects showed an increase equivalent to 14±5 mmHg, (p = 0.001). Also, both groups presented a significant maximum increase in forearm vascular resistance (Hypertensive = 19±11 units; normotensive = 20±13 units, p = 0.001) and in muscle sympathetic nerve activity (Hypertensive = 8±2 bursts/min, normotensive = 8±4 bursts/min, p = 0.001). After acute water ingestion, both, hypertensive and normotensive human subjects showed a decreased heart rate, forearm blood flow, and plasmatic volume. The heart rate decrease in hypertensive subjects was equal to - 5.6±2.1 beats/min; and for normotensive subjects was = - 5.4±7.3 beats/min, (p = 0.002), the forearm blood flow decrease in hypertensive subjects was = - 0.5±0.4 ml/min/100 ml tissue, and in normotensive subjects was = - 0.7±0.6 ml/min/100 ml tissue, (p = 0.001), and the plasmatic volume drop in hypertensive subjects was = - 0.8±0.8 %; and for normotensive subjects was = - 1.0±0.9%, (p = 0.002). Heart rate and systolic arterial pressure variability were not altered by acute water ingestion. CONCLUSION. An acute water ingestion equally increases systolic and diastolic arterial pressure in human subjects with stage I hypertension, as well as those normotensive ones, probably by increasing peripheral vascular resistance, which is secondary to sympathetic activity.

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