Lucio Marques Vieira-Souza; Anderson Carlos Marçal; Jymmys Lopes dos Santos; Felipe José Aidar; Samuel Bruno dos Santos; André Luiz de Santana Silva; Gracielle Costa Reis; George Franklin Santana de Carvalho; Raphael Fabrício de Souza; Darlan Tavares dos Santos; Dany Alexis Sorbazo Soto & Ciro José Brito

High-intensity physical exercises can cause oxidative stress and muscle damage. Several medicinal plants have been used as antioxidant and anti-inflammatory agents. The present study evaluated high-intensity resistance exercise (HIRE) associated with Schinus Terebentifholius ethanolic extract (EE) on oxidative parameters and muscle damage in Wistar rats. Animals were divided into 04 groups (n=10/group): 1. Control (CG) - animals that did not undergo HIRE and were treated with vehicle (distilled water, orally); 2. Acute exercise (AE) – animals submitted to acute exercise session; 3. Exercise + vehicle (EV) - animals that underwent HIRE and were treated with vehicle and 4. Exercise + extract (EX) animals administered with Schinus terebenthifolius EE (100mg/Kg, orally) and submitted to the exercise session. Schinus terebenthifolius EE showed high in vitro antioxidant activity (13.88 ± 0.36 mg/mL). Before the experimental period, lactate was measured at pre and post moments of AE (p<0.0001) and EX (p<0.0001) groups. After the acute session, the following were evaluated: oxidative stress {malondialdehyde (MDA), sulfhydryl groups (SH) and ferric reducing antioxidant power (FRAP)}, muscle damage (creatine kinase (CK) and lactate dehydrogenase (LDH)), alanine aminotransferase (ALT) and aspartate aminotransferase (AST). In the in vivo analyses of the EX group compared to AE and EV groups, respectively: hepatic (MDA: p<0.0001 and SH: p=0.0033, in both; FRAP: p=0.0011 and p=0.0047), muscle (MDA, SH and FRAP: p<0.0001, in both; CK: p=0.0001 and p<0.0001; LDH: p<0.0001, in both), serum levels (MDA: p=0.0003, p=0.0012, SH: p=0.0056, p=0.0200, FRAP: p=0.0017 and p=0.0165) were significant. There was no significant difference in ALT and AST markers. It could be concluded that Schinus terebenthifolius EE associated with HIRE attenuated oxidative stress and muscle damage in rats.

KEY WORDS: Physical Training; Supplements based on Medicinal Plants; Natural Product; Oxidative Lesion; Damage Reduction.

VIEIRA-SOUZA, L. M.; MARÇAL, A. C.; DOS SANTOS, J. L.; AIDAR F. J.; DOS SANTOS, S. B.; SILVA, A. L. S.; REIS, G. C.; CARVALHO, G. F. S.; SOUZA, R. F.; SANTOS, D. T.; SOTO, D. A. S. & BRITO, C. J. High-intensity resistance exercise and Schinus terenbinthifolius supplementation attenuate oxidative stress and muscle damage biomarkers. Int. J. Morphol., 40(3):781-788, 2022.