Abstract
Investigate the effects of low-level lasers therapy (LLLT) aiming abdominal lipolysis. Female Wistar rats received applications of LLLT directly in the abdominal skin twice a week (5 weeks). Except the control group (n = 5), animals received treatments with red wavelength 660 nm being (I) R3.3 group (n = 5): 3.3 J/cm2, and (II) R5 group (n = 5): 5 J/cm2, or infrared wavelength 808 nm being (III) IR3.3 group (n = 5): 3.3 J/cm2, and (IV) IR5 group (n = 5): 5 J/cm2. Abdominal subcutaneous and liver tissues were evaluated histologically. Levels of thiobarbituric acid reactive substances (TBARS) and catalase (CAT) activity were analyzed in liver tissue. In the peripheral blood aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglycerides, and total cholesterol were investigated. Micronucleus assay was performed in the bone marrow. Except for the IR3.3 group, all treated groups reduced the body weight (p < 0.001). The R5 group reduced the abdominal subcutaneous tissue weight and thickness (p < 0.05), even though all treated groups reduced the number of adipocytes and its size (p < 0.001). No histological changes in the liver. There were no alterations in the triglycerides and LDL levels. The IR5 group increased the total cholesterol levels and decreased the HDL, ALT (both p < 0.05), and AST levels (p < 0.001). The group IR3.3 showed higher levels of ALP (p < 0.01). The R3.3 group increased the TBARS and CAT activity (p < 0.05). No mutagenic effects were found. The red laser treatment at 5 J/cm2 led to lipolysis and did not alter the liver’s parameters.
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Conceptualization: Marcia Gerhardt Martins, Lucimar Filot da Silva Brum. Data curation and formal analysis: Maria Isabel Morgan Martins, Flavia Tasmin Techera Antunes, Elenir de Fátima Wiilland, Jaqueline Nascimento Picada. Funding acquisition and resources: Alessandra Hubner Souza, Priscilla Batista Pail. Investigation, methodology, and visualization: Marcia Gerhardt Martins, Maria Isabel Morgan Martins, Alessandra Hubner Souza, Elenir de Fátima Wiilland, Jaqueline Nascimento Picada. Project administration: Maria Isabel Morgan Martins, Lucimar Filot da Silva Brum. Supervision: Alessandra Hubner Souza, Maria Isabel Morgan Martins, Priscilla Batista Pail, Lucimar Filot da Silva Brum. Writing — original draft: Marcia Gerhardt Martins, Maria Isabel Morgan Martins, Alessandra Hubner Souza, Lucimar Filot da Silva Brum. Writing — review amd editing: Flavia Tasmin Techera Antunes, Alessandra Hubner Souza, Jaqueline Nascimento Picada, Maria Isabel Morgan Martins.
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Martins, M.G., Martins, M.I.M., de Souza, A.H. et al. Evaluation of lipolysis and toxicological parameters of low-level laser therapy at different wavelengths and doses in the abdominal subcutaneous tissue. Lasers Med Sci 37, 1235–1244 (2022). https://doi.org/10.1007/s10103-021-03378-y
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DOI: https://doi.org/10.1007/s10103-021-03378-y