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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2013.tde-18062014-155708
Document
Author
Full name
André Ricardo Gomes de Proença
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Lima, Fabio Bessa (President)
Alaniz, Miriam Helena Fonseca
Carvalho, Carla Roberta de Oliveira
Cipolla Neto, Jose
Nascimento, Claudia Maria da Penha Oller do
Title in Portuguese
Exercício físico e melatonina promovem conjuntamente redução da adiposidade em ratos, embora estes se tornem hipogonádicos.
Keywords in Portuguese
Exercício físico
Melatonina
Ratos wistar
Tecido adiposo
Testosterona
Abstract in Portuguese
O objetivo deste trabalho foi o de averiguar se o exercício físico somado a suplementação com melatonina em animais pós-púberes, modifica a adiposidade e a regulação da atividade lipolítica, nos tecidos adiposos das regiões subcutânea inguinal e retroperitoneal, além de verificar possíveis efeitos antigonadotróficos decorrentes do tratamento com melatonina. A concomitância do treinamento físico e da suplementação com melatonina durante 8 semanas em ratos Wistar, foi mais eficiente em promover reduções no diâmetro dos adipócitos e, consequentemente, na adiposidade do que o uso isolado do treinamento físico ou da suplementação com melatonina. Entretanto, não foram observadas alterações na atividade lipolítica, e nem na lipogênese, medidas em adipócitos isolados das regiões estudadas. A suplementação promoveu hipogonadismo com consequente redução da testosteronemia, além de uma redução da massa do músculo extensor digital longo. evidenciando assim a necessidade de se aprofundar os estudos sobre os impactos do uso de melatonina sobre o eixo hipófise-hipotálamo-gônadas.
Title in English
Exercise and melatonin acting together promote in rats adiposity reduction, although they become hypogonadic.
Keywords in English
Adipose tissue
Melatonin
Physical exercise
Testosterone
Wistar rats
Abstract in English
Hence, the purpose of this study was to investigate whether the physical exercise plus supplementation with melatonin in postpubertal animals modify adiposity and regulation of lipolysis in the inguinal subcutaneous and retroperitoneal adipose tissues, away from assessing the possible antigonadotropic effects resulting from melatonin treatment. The concomitance of physical training and melatonin supplementation for 8 weeks in rats were more efficient in promoting reductions in adipocyte size and hence in adiposity than physical training or melatonin supplementation alone. However, no changes were observed in lipolysis or in lipogenesis, measured in isolated adipocytes from investigated the fat depots. We also showed that, even at this low dose, melatonin promoted hypogonadism with consequent reduction of the testosteronemia and a reduction in extensor digitorum longus muscle mass, thus evidencing that further studies on the impacts of the use of melatonin the hypothalamic-pituitary-gonadal axis are actually needed.
 
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Publishing Date
2014-06-25
 
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