Evaluation by fractal dimension of muscle regeneration after photobiomodulation

Abstract

Introduction: Many treatment modalities are used for muscle tissue recovery. Photobiomodulation is a modality that can be employed to improve the quality of tissue repair. The use of fractal dimension (FD) is an innovative methodology in the quantitative evaluation of treatment efficacy. Objective: Use FD as a quantitative analysis method to evaluate the effect of photobiomodulation of 904 nanometers (nm) in the initial phase of the muscle regeneration process. Method: Thirty male Wistar rats were divided into three groups: Control Group (CG), Injured and Untreated Group (IUT), and Injured and Treated Group (IT). Muscle injury was induced by cryoinjury in the central region of the anterior tibial (AT) belly of the left posterior limb. This was performed by an iron rod that was previously immersed in liquid nitrogen. Applications started 24 hours after the injury and occurred daily for five days. They were performed at two points in the lesion area. The rats were euthanized on the seventh day. The AT muscles were removed and frozen in liquid nitrogen. Then, the histological sections were stained using the Hematoxylin-Eosin (HE) technique and submitted to FD analysis performed by the box-counting method using ImageJ software. The Kolmogorov-Smirnov test was used for data normality, and the Kruskall-Wallis test and Dunn's post-test were used for group comparison (p<0.05%). Results: Differences between IT and IUT groups were statistically significant, and it was possible to observe the reduction of fractability with p=0.0034. Conclusion: FD is a useful tool for the analysis of skeletal muscle disorganization in the initial phase of regeneration and confirms the potentially beneficial effects of photobiomodulation to this process.

Efeito da suplementação de alimentos funcionais no músculo esquelético de ratos expostos cronicamente ao tabagismo

“…Alimentos funcionais, probióticos, prebióticos e simbióticos, têm demonstrado efeitos antiinflamatórios, imunomoduladores e antioxidantes (HAMED et al, 2018;ROMBI;RUFINO;BREMER-NETO, 2021;TRIBST et al, 2019;YOUNAN et al, 2019) Essa técnica, DF, permite caracterizar estruturas irregulares em lâminas histológicas, a desorganização do músculo esquelético e quantificar alterações existentes (CURY et al, 2018;OLIVEIRA et al, 2020;OZAKI et al, 2015). O objetivo desse estudo foi avaliar o efeito da suplementação na ração de alimentos funcionais, probiótico, prebiótico e simbiótico, de ratos na fase de crescimento expostos cronicamente a fumaça de cigarro, através da dimensão fractal.…”