Effects of low level laser in the morphology of the skeletal muscle fiber during compensatory hypertrophy in plantar muscle of rats

Stella Maris Lins Terena; Kristianne Porta Santos Fernandes; Sandra Kalil; Agnelo Neves Alves; Raquel Agnelli Mesquita Ferrari

doi:10.1117/12.2181034

19 June 2015 Effects of low level laser in the morphology of the skeletal muscle fiber during compensatory hypertrophy in plantar muscle of rats

Stella Maris Lins Terena, Kristianne Porta Santos Fernandes, Sandra Kalil, Agnelo Neves Alves, Raquel Agnelli Mesquita Ferrari

Author Affiliations +

Proceedings Volume 9531, Biophotonics South America; 95312I (2015) https://doi.org/10.1117/12.2181034
Event: SPIE Biophotonics South America, 2015, Rio de Janeiro, Brazil

Abstract

The hypertrophy is known as an increase the cross-sectional area of the muscle as a result of a muscular work against an overload, and it is compensatory because the overload is induced by functional elimination of synergistic muscles. The importance of study the compensatory hypertrophy is understand how this process can be influenced by the irradiation with regard to the weight and muscle cross-sectional area, to assist in the rehabilitation process and the effectiveness functional return. The aim was evaluate the effects of low-level laser irradiation on morphological aspects of muscle tissue, comparing the weight and cross-sectional area in rat skeletal muscle. Wistar rats were divided into three groups: control, hypertrophy group without irradiation (right plantar muscle) and hypertrophy group and irradiation (left plantar muscle), both analyzed after 7 and 14 days. The irradiation was performed daily immediately after the surgery. The parameters were: λ = 780nm, beam spot of 0.04 cm2, output power of 40mW, power density of 1W/cm2, energy density of 10J / cm2 and 10s exposure time with a total energy of 3.2 J. The results revealed that low level laser irradiation an increase the weight of the plantaris muscle after 7 and 14 days with a difference of 7.06% and 11.51% respectively. In conclusion, low level laser irradiation has an effect on compensatory hypertrophy to produce increased muscle weight and promoted an increase in cross-sectional area of muscle fibers in the compensatory hypertrophy model after 14 days with parameters cited above.

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Stella Maris Lins Terena, Kristianne Porta Santos Fernandes, Sandra Kalil, Agnelo Neves Alves, and Raquel Agnelli Mesquita Ferrari "Effects of low level laser in the morphology of the skeletal muscle fiber during compensatory hypertrophy in plantar muscle of rats", Proc. SPIE 9531, Biophotonics South America, 95312I (19 June 2015); https://doi.org/10.1117/12.2181034

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