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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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OTHER AREAS (Biochemistry, Immunology, Kinanthropometry, Neurology, Neurophysiology, Ophtalmology, Pharmacology, Phlebology, etc.)
Seifi-Skishahr F., Siahkohian M., Nakhostin-Roohi B.
Department of Physical Education and Sport Science University of Mohaghegh Ardabili, Ardabil, Iran
Aim. The purpose of this investigation was to evaluate the oxidative stress response to aerobic exercise at high and moderate intensities.
Methods. Twenty healthy untrained men were randomly allocated into two groups: moderate intensity (MI) and high intensity (HI). Subjects of group MI and HI ran on the treadmill for 30-minutes at a running speed corresponding to 60% and 75% V.O2max respectively. Blood lactate (LA) was measured before and immediately after the exercise. The subjective rate of perceived exertion (RPE) was obtained at the end of the trail. Venous blood samples were obtained before the exercise, immediately, 2h, and 24h after exercise. Blood samples were analyzed for malondialdehyde (MDA), as a biomarker of lipid peroxidation; uric acid (UA) as an intrinsic antioxidant; creatinin kinase (CK) activity, as a biomarker of muscle damage as well as total and differential leucocytes, as biomarkers of inflammation. The pattern of RPE was not significantly influenced by intensity of exercise.
Results. There was no significant difference in LA, CK, MDA, UA, and total and differential leukocytes between two groups (P>0.05). MDA was increased 2h after exercise only in group HI (P<0.05). Plasma UA concentrations and CK activities were significantly greater than pre-exercise in immediately and 2h after exercise in both groups (p<0.05). Exercise resulted in significant leukocytosis immediately after exercise in both groups and 2h after exercise only in group HI (P<0.05), returning to pre-exercise levels after 24h just in group MI. Neutrophil counts were increased 2h after exercise in both groups and 24h after exercise only in group HI (P<0.05). Monocyte counts were increased 2h after exercise only in group HI (P<0.05).
Conclusion. These data suggest that exercise with moderate intensity causes less lipid peroxidation and inflammation in comparison with high intensity exercise.