ABSTRACT
Objetivo: Avaliar se a fotobiomodulação isolada e em associação com a soroterapia, modula fatores pró- e anti-inflamatórios, bem como o reparo e a função motora de músculos de camundongos injetados com veneno de Bothrops jararacussu. Métodos: Camundongos (Swiss, machos, 45 dias, 18-22g) foram submetidos experimentalmente a modelo de mionecrose causada por reações locais desencadeadas pelo envenenamento botrópico (injeção intra-muscular na pata posterior direita), soroterapia (uma única vez, pela via intra-venosa, 45 minutos após o envenenamento) e fotobiomodulação (LASER de baixa intensidade - 660nm, potência média de 100mW e dose de 3,0J de energia). Em seguida, foram distribuídos nos seguintes grupos: veneno (V), antiveneno (A), LASER (L), antiveneno+LBI (AL) e controle (C). A fotobiomodulação ocorreu no músculo envenenado e a cada 24h, por até 14. Incilamente foi testada a ação miotóxica do modelo de lesão proposto e após estes procedimentos, foram coletadas amostras de tecido muscular: 4 horas, 1, 7, 14 e 21 dias pós-envenenamento; para realização de análises histológicas, dosagem de mieloperoxidase (MPO) e N-acetil-β-D-glicosaminidase (NAG), níveis de CK-residual, citocinas (método de ELISA): IL-1β, TNF-⍺, IL-6 e IL-10 e (método de Western Blotting) CD68, CD206, VEGF, TGF-βMyoD, além da realização de teste funcionais: rotarod e análise da marcha. Resultados: As análises dos desfechos propostos e as comparações intergrupos, demonstraram que o protocolo de fotobiomodulação associado à soroterapia promoveu a presença de áreas de maior concentração de características de regeneração muscular, detectadas nas análises histológicas e mediante o aumento dos níveis de CK-residual. Além disso, apresentou aspectos de proteção do tecido muscular, uma vez que conteve os níveis de infiltrado inflamatório neutrofílico nos tempos mais precoces do presente estudo. Foram identificados melhores índices funcionais e detectadas características anti-inflamatórias e reparadoras da lesão, mediante os aumentos dos níveis de CD206, IL-10, TGF-β e MyoD. Conclusões: O protocolo de fotobiomodulação, principalmente quando associado à soroterapia; se mostrou efetivo para modular os fatores anti-inflamatórios, regenerativos e as características funcionais.
ABSTRACT
Objective: The main objective was to verify the modulatory effects of MMP-1, MMP-3, and MMP-13 levels on the partially injured calcaneal tendons of rat exposure to photobiomodulation. Background: Photobiomodulation has been shown to have anti-inflammatory and regenerative effects on tendon injuries. However, there is still uncertainty regarding the beneficial effects in matrix metalloproteinase (MMP) levels, especially MMP-1, -3, and -13. Materials and methods: Sixty-five male Wistar rats were used. Sixty were submitted to a direct trauma on the calcaneal tendons and were randomly distributed into the following six groups: LASER 1, 3, and 7 (10 partially injured calcaneal tendons in each group treated with photobiomodulation for 1, 3, and 7 days, respectively) and Sham 1, 3, and 7 (same injury, with simulated photobiomodulation). The remaining five animals were allocated to the normal group (no injury or treatment procedure). The 780 nm low-level laser was applied with 70 mW of mean power and 17.5 J/cm2 of fluency for 10 sec, once a day. The tendons were surgically removed and analyzed for MMP-1, MMP-3, and MMP-13 through immunohistochemistry. Results: MMP-3 levels remained close to normal in all experimental groups (p > 0.05); however, reductions (p < 0.05) in MMP-1 and MMP-13 levels were detected in the groups submitted to one, three, and seven low level laser therapy applications. Conclusions: The photobiomodulation protocol was able to reduce MMP-1 and MMP-13 levels in injured calcaneal tendons.
Subject(s)
Achilles Tendon/metabolism , Low-Level Light Therapy/methods , Matrix Metalloproteinase 13/metabolism , Matrix Metalloproteinase 1/metabolism , Matrix Metalloproteinase 3/metabolism , Tendinopathy/metabolism , Tendinopathy/radiotherapy , Animals , Disease Models, Animal , Male , Rats , Rats, WistarABSTRACT
OBJECTIVES: To analyze kinesio taping (KT) effect on quadriceps strength and lower limb function over a 7-day period. DESIGN: Blind randomized clinical trial. SETTING: Hospital's Physical Therapy Department. PARTICIPANTS: Sixty healthy individuals (30 men and 30 women) were randomly distributed into three groups: Control--without KT application; Placebo--placebo KT application and Experimental--A KT application designed to stimulate quadriceps femoris activity. MAIN OUTCOME MEASURES: The quadriceps strength was measured using a manual dynamometer whereas lower limb function was assessed using the Single Hop Test for Distance. Evaluations occurred at five time-points: baseline; immediately, 3 and 5 days after KT application; and 72 h post KT withdrawal. RESULTS: There was no significant interaction between time-points and groups for muscle strength: dominant (P = 0.13) and non-dominant (P = 0.41) and lower limb function: dominant (P = 0.09) and non-dominant (P = 0.53); but lower limb function within-group comparisons showed improvements in all groups at the evolution of all time-points analyzed for both limbs (P = 0.001). This is possibly due to a learning effect as the participants became more familiar with executing the assessment tests. CONCLUSION: KT did not improve quadriceps strength and lower limb function of healthy individuals and its application with these objectives should be reconsidered.