Independent and combined effects of all-out sprint and low-intensity continuous exercise on plasma oxidative stress biomarkers in trained judokas

The purpose of this study was to assess oxidative stress biomarkers prior to and following different forms of exercise. Ten elite male judokas (age: 18.1±1.7 years, athletic experience: 6 years with a training frequency of 6 Judo-sessions/week) performed three cycle ergometry sessions comprising a 30s Wingate test (MAX), 30 min at 60% maximal-aerobic-power-output (LOW) or these two exercise protocols combined (COMBINED) in a repeated-measures design. Venous blood-samples were collected before, and 0(P0), 5(P5), 10(P10) and 20(P20) min after each exercise protocol and assessed for malondialdehyde concentration ([MDA]), glutathione peroxidase (GPX), superoxide dismutase (SOD) and glutathione reductase (GR) content, and total-antioxidant-status (TAS). Plasma [MDA] was found to be increased above baseline at P0 and P5 in the MAX, LOW and COMBINED conditions (p<0.05), but was greater at P10 and P20 in the LOW condition compared to MAX and COMBINED conditions (p<0.05). Plasma GPX and SOD content increased above baseline at P0 in MAX and COMBINED and at P5 in LOW (p<0.05), with GR content being similar between groups at P0 and P5 (p>0.05). Twenty min post-exercise, plasma GPX, SOD, GR content and TAS were lower in the MAX compared to the LOW and COMBINED conditions (p<0.05). In conclusion, the findings from this study reveal that redox-related biomarkers exhibited divergent response dynamics following different forms of exercise, which might have implications for understanding the mechanisms of exercise-induced skeletal muscle fatigue and adaptive remodeling.