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    Efeitos da terapia laser de baixa intensidade associada ao treinamento resistido em quadríceps femoral no desempenho muscular de idosas
    (Universidade Federal de São Paulo (UNIFESP), 2016-08-30) Toma, Renata Luri [UNIFESP]; Renno, Ana Claudia Muniz [UNIFESP]; http://lattes.cnpq.br/4106611304688552; http://lattes.cnpq.br/4802965602896674; Universidade Federal de São Paulo (UNIFESP)
    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.