PEDro scores of included studies.

PurposeThis meta-analysis aimed to establish the effect of vigorous and non-vigorous exercise interventions on biomarkers of redox status in healthy adults.Materials and methodsBased on the PRISMA guidelines, we searched the following databases: Scopus, Web of Science, PubMed, Springer, Science Direct, Cochrane Library, Dialnet, Redalyc, and Lilacs for randomized controlled clinical trials investigating the effect of non-vigorous and vigorous chronic exercise in healthy adults, with the evaluation of antioxidants. The quality of evidence and risk of biases were assessed using the PEDro scale and version 2 of the Cochrane tool for risk of bias assessment in randomized trials (RoB2).ResultsSeven randomized clinical trials evaluating nine training protocols were included (n=267). Individual evaluations demonstrated an increase in antioxidant capacity (I2=0%, Z=4.56, p2=52%, Z=1.94, p=0.05), an antioxidant enzyme, and decrease in pro-oxidant (I2=0%, Z=5.91, p2=81%, Z=0.50, p=0.62). The effect of vigorous interventions showed an increase in antioxidants (Z=2.44, I2=67%, p=0.01) and a decrease in oxidants (Z=5.44, I2=0%, pConclusionsThe vigorous physical exercise presented better results on antioxidant and oxidative capacity compared to non-vigorous intensity training protocols in healthy people. Finding the optimal balance between exercise intensity and oxidative stress is crucial for maximizing the production of antioxidant enzymes, which can enhance physiological function and increase resistance to OS.