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ferraz_gc_dr_jabo.pdf: 350223 bytes, checksum: b891797f003f4d37b95356d6323dbe68 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Metodos costumeiramente empregados no estudo da fisiologia do exercicio podem ser utilizados para avaliar os efeitos de substancias licitas (ergogenicos) ou ilicitas (doping) sobre a capacidade atletica. Estudaram-se algumas respostas endocrinas, metabolicas, cardiacas e hematologicas de equinos, treinados, da raca Puro Sangue Arabe (PSA) submetidos ao exercicio intenso e a administracao isolada de cafeina (CAF), aminofilina (AM) ou clembuterol (CL), 30 minutos antes do esforco fisico, nas doses de 5 mg.kg-1, 10 mg.kg-1 e 0,8 Êg.kg-1 de peso corporeo, respectivamente. Para avaliacao dos efeitos do exercicio e farmacos empregou-se exercicios testes em esteira rolante, utilizando-se inclinacao de 10% com incrementos de velocidade, sendo realizadas colheitas de sangue 15 segundos antes do termino de cada etapa. Nas amostras de sangue foram quantificados hematocrito, contagem de hemacias, hemoglobina e leucocitos totais, alem da glicemia, lactacidemia, insulinemia, cortisolemia. Tambem avaliou-se a frequencia cardiaca. Para todas analises estatisticas realizadas, estabeleceu-se como nivel de significancia p.0,05. Os resultados mostram que a CAF elevou significativamente a lactacidemia, glicemia e o hematocrito, mas reduziu a insulinemia e a cortisolemia. Para AM houve elevacao significativa da glicemia no inicio do exercicio e reducao nas etapas de exercicio maximo, sendo tambem observado aumento da lactacidemia. O CL provocou elevacao significativa da frequencia cardiaca e insulinemia. A cafeina prejudicou a capacidade aerobica, mas aumentou metabolismo anaerobico. Ja a aminofilina parece interferir na homeostase da glicemia durante o exercicio intenso, mas melhorou a via glicolitica anaerobica. Finalmente, o clembuterol nao melhorou a capacidade aerobica e, marcadamente, prejudicou a resposta cardiaca, bem como aumentou a insulinemia. / Currently, equine exercise physiology is in a considerable development in Brazil. The use of scientific methods for the evaluation of the exercise and training protocols is fundamental for the maximization of equine performance. It also can be applied to evaluate the effects of legal (ergogenics) and/or illegal substances during competitions on athletic horses. Some metabolic, endocrine, cardiac and hematologic responses of trained Arab horses submitted to intense exercise and to the administration of caffeine, aminophylline and clenbuterol, a single dose given at 30 minutes before the effort. Doses were, respectively, 5 mg.kg-1, 10 mg.kg-1 and 0,8 Êg.kg-1. A treadmill was employed for the evaluation of exercise and drug effects, with 10% slope and speed increments. Blood samples were withdrawn 15 seconds before the end of each exercise bout. Hematocrit, erythrocytes and leucocytes count, hemoglobin, glucose, lactate, insulin and cortisol concentration, were determined. Heart rate was also monitored at the same time points. A minimum criterion of P.0,05 was adopted for statistical significance. Our results revealed significant variations in all physiologic parameters studied. Caffeine impaired the aerobic capacity but improved the aerobic potency. Aminophylline interfered in glycemic curve during intense exercise, but improved anaerobic performance. Finally, clenbuterol did not improve the parameters association with aerobic metabolism, but, markedly, impaired cardiac response, and increased insulin concentration compromising glycemic control during intense exercise.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/101261 |
| Date | 01 December 2006 |
| Creators | Ferraz, Guilherme de Camargo [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Neto, Antonio de Queiroz [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | viii, 98 f. : il. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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