Lipid peroxidation and total glutathione after different intensities of resistance exercise in trained men
R B K Carteri1, M I Schaun, A L Lopes
1Exercise Research Laboratory (Lapex), School of Physical Education (ESEF), Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil - randhallcarteri@hotmail.com.
Aim:
Since studies on resistance exercise and oxidative stress markers show contradictory results, it is not clear whether different intensities of exercise are the determinant of changes in such markers. The objective of this study was to investigate the acute effects of different intensities of resistance exercise on lipid peroxidation and total glutathione in previously resistance trained men.
Methods:
Eight male subjects with at least 2 years of resistance training experience performed two different resistance exercise protocols: low-intensity (LI), 60% of one repetition maximum (1RM) and high-intensity (HI), 85% of 1RM. Both protocols involved seven exercises and subjects performed one set of each exercise. Blood samples were obtained before and immediately after exercise for lipid peroxidation and total glutathione analysis.
Results:
The results indicated a significant difference in total workload (load multiplied by repetitions performed) between the LI and HI protocols (P<0.05) and no differences on lipid peroxidation and total glutathione after both LI and HI protocols.
Conclusion:
This study suggests that resistance exercise protocols composed of a single set of seven exercises, regardless of the intensity or total workload do not induce to oxidative stress, suggesting that volume is the main variable to induce oxidative stress in previously resistance trained individuals.
