Efeitos da terapia laser de baixa intensidade associada ao treinamento resistido em quadríceps femoral no desempenho muscular de idosas

• Autor(a) principal: Toma, Renata Luri [UNIFESP]
• Data de Publicação: 2016
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=4624606; https://repositorio.unifesp.br/handle/11600/46189
• topic: Aging; Low level laser therapy; Strength training; semg; Muscle fatigue; Envelhecimento; Terapia a laser de baixa intensidade; Treinamento de resistência; Eletromiografia; Fadiga muscular

Objective: The aim was to evaluate the effects of combination of low level laser therapy (LLLT) and strength training on muscle performance in elderly women. Methods: For this, a hundred elderly women were screened, and 48 met all inclusion criteria to participate in this double-blind placebo-controlled trial. Volunteers were divided in three groups: control (CG = 15), strength training associated with placebo LLLT (TG = 17), and strength training associated with active LLLT (808 nm, 100 mW, 7 J) (TLG = 16). The strength training consisted of knee flexion-extension performed with 80 % of 1-repetition maximum (1-RM), twice a week during 8 weeks. LLLT was applied on quadriceps muscle belly after each strength training session. Several outcomes related to muscle performance were analyzed through the 6 minutes walk test (6-MWT), 1-RM, isokinetic dynamometry, surface electromyography (SEMG) and lactate concentration. Results: The results revealed that a higher work (p = 0,0162), peak torque (p = 0,0309), and power (p = 0,0223) were observed in TLG compared to CG. Furthermore, both trained groups increased the 1-RM load (TG vs CG: p = 0,0067 and TLG vs CG: p < 0,0001) and decreased the lactate concentration in the third minute after isokinetic protocol (CG vs TLG: p = 0,0289 and CG vs TG: p = 0,0085). No difference in 6-MWT and in fatigue levels were observed among the groups. Conclusion: The present findings suggested that LLLT in combination with strength training was able to improve muscle performance in elderly people.