Efeitos da fotobiomodula????o utilizando LED sobre os aspectos morfol??gicos musculares e reparo do tecido nervoso p??s les??o de nervo ci??tico de ratos wistar

• Ano de defesa: 2017
• Autor(a) principal: Soldera, Carla Bernardo
• Orientador(a): Ferrari, Raquel Agnelli Mesquita
• Banca de defesa: Ferrari, Raquel Agnelli Mesquita, Nunes, Fabio Dalmas, Bussadori, Sandra Kalil
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Nove de Julho
• Programa de Pós-Graduação: Programa de P??s-Gradua????o em Ci??ncias da Reabilita????o
• Departamento: Sa??de
• País: Brasil
• Palavras-chave em Português: les??o nervosa perif??rica; LED; regenera????o nervosa e muscular; nervo ci??tico
• Palavras-chave em Inglês: peripheral nerve injury; LED; nerve and muscle regeneration; sciatic nerve
• Área do conhecimento CNPq: CIENCIAS DA SAUDE
• Link de acesso: http://bibliotecatede.uninove.br/handle/tede/1870

Peripheral nerve lesions (LNP) do not clinically present a risk of death to the individual but may result in motor and sensory disturbances altering the function of the affected limb. Phototherapy using low level laser has demonstrated positive effects for the nervous and muscle repair process after different types of injury and little is known about the effects of light emitting diode (LED) therapy. Objective: To analyze the effects of LED on the nervous and muscular repair of Wistar rats after sciatic nerve crush injury. Methodology: 85 Wistar rats, weighing 200-250g, in 5 groups: Control: without any procedure; Injury: carried out only the crushing of the Left Sciatic Nerve (LSN); Injury + LEDn: LSN crushing and LED irradiation in the area corresponding to the nerve injury; Injury + LEDmm: LSN and LED crushing in Tibial Anterior muscle; Injury + LEDn + LEDmm: NSE crushing and LED irradiation in the area corresponding to nerve injury and muscle. The application of the LED in the nervous region was performed with the following parameters: wavelength of 808nm, beam area 1 cm2, average power 40Mw, power density 0.04 W/cm2, energy density 0.8 J/cm2, energy per point 0.8J , total of points 4, time per point 20sec, total time 80sec, energy per point 3.2J and in muscle region was used wavelength of 808nm, beam area 1 cm2, average power 40Mw, power density 0.04 W/ cm2, density of energy 0.4 J/ cm2, energy per point 0.4J, total of points 8, time per point 10sec, total time 80sec, energy per point 3.2J. At the end of the experimental periods, the gait analysis and the mechanical hyperalgesia test were performed. At the end of the experimental periods, gait analysis was performed using the Sciatic Function Index (IFC), as well as the analysis of mechanical hyperalgesia using the von Frey test using the pressure analgesimeter with transducer. After the euthanasia of the animals, the tibial muscles, left and right, were removed and weighed in a semi-analytical balance to determine the degree of muscular atrophy and the muscle mass ratio was calculated. Result: After the IFC, within 7 days, all groups treated with LED showed an improvement in gait compared to the lesion group. The group LEDn was the one that presented the best result compared to the control group. After 14 days, the group LEDn and LEDnm presented similar values to the control group. Regarding the muscular atrophy index, in the 7-day period, all the groups treated with LED showed a decrease of the index in relation to the Control group. In 14 days, the LED groups showed an increase in relation to the Injury group. At 21 and 28 days, the injured groups showed a decrease in relation to the Control group. Only the LEDnm group showed a decrease compared to the Injury group. Regarding mechanical hyperalgesia, the results showed that in 7 days, the LEDn group was the one that presented the best result compared to the control group. At 14 days, the LEDn and LEDm groups showed an increase in the threshold, requiring a greater pressure to promote an allergic response compared to the control group, making them more resistant to the stimuli. At 28 days, all lesioned and treated groups showed an increase in hyperalgesia in relation to the control group. Conclusion: We can conclude that LED increased gait functionality assessed by IFC after 1 and 2 weeks post LNP, especially when it was used in the nerve region associated or not to the muscle region, induced an increase in muscle mass in relation to the animals that did not receive treatment in the period of 2 weeks post LNP and in the 2 week period post LNP provided an increase in the pain threshold compared to the control group, requiring a nociceptive stimulus of greater intensity to generate the pain stimulus indicating a better recovery.