Strenuous exercises greatly increase oxygen consumption in the whole body, especially in skeletal muscles. Large part of oxygen consumption is reduced to H2O and ATP, but smaller part (2-5%) results in an increased leakage of electrons from the mitochondrial respiratory chain, forming various reactive oxygen species-ROS (02, H2O,iOH). These free ra- dicals are capable of triggering a chain of damaging biochemical and physiological reactions (oxidative stress, lipid peroxi- dation), as a base for skeletal muscles damage after exercise. MDA (malondialdehyde) is a marker of exercise induced lipid peroxidation process. L-ascorbic acid is a major aqueous-phase antioxidant. To estimate antioxidant role of ascorbic acid we use rate between dehydroascorbate and ascorbate. In this paper those markers of lipid peroxidation (MDA, MDA ind, % ind MDA), and ascorbic acid status (ascorbic acid Asc, ascorbat A, dehidroascorbat DHA, DHA/A) were determinated in 30 stu- dents, in rest and after treadmill running protocol (Bruce Treadmill Protocol). It was found that after the treadmill test, plas- ma MDA level had increased from 3,04 to 4,39 M/L (p<0,0001) and % ind MDA decreased significantly from 35% to 24,7% (p=0,0003). Plasma ascorbic acid was also found to be higher after the treadmill test comparing to rest level (from 55,4 to 67,6 μM/L). DHA/A level in rest was 1,62 and after treadmill test it increased to 2,05 (p=0,0014). These results suggests that strenuous exercise increased process of lipid peroxidation (MDA †, % ind MDA), but in the same time incre- ased ascorbic acid level in plasma and DHA/A rate indicates stronger activation of nonenzymatic antioxidant defense system.

It is well known that intensive physical activity increase the production of reactive species of O and N (RONS), but 2 it is also known that moderate and regular physical activity has influence on antioxidative system adaptation and help in repairing process of oxidative damage. In this paper we estimated markers of lipid peroxidation (MDA, % ind MDA), and antioxidant status (Asc, DHA/A, GSH, CAT, Pex) for 30 students (control group), and 30 professional football players (regular intensive physical activity). In the group of professional sportsman there were significant increase of lipid peroxidation markers (MDA ↑, % ind MDA ↑), which was also followed by an increased antioxidant activity (Asc ↑, DHA/A ↑, GSH ↑, Pex ↑, CAT ≈). We can conclude that chronic physical activity significantly improves antioxidant status using the adaptation process.

Regulatory T cells represent unique CD4+CD25+ population of T lymphocytes, which are involved in many immunological events. These cells have very important role in maintaining peripheral tolerance, prevention of autoimmune diseases, in immunological respond to infection, particularly by intracellular microorganisms as well as in a process of tumorogenesiz. There are two populations of regulatory T cells: natural regulatory T cells - nTregs and adaptive, inducible regulatory - iTregs. They differ between each other in accordance to the place of creation, in accordance to the specificity of the T cell receptor, as well as the action mechanism. nTregs and the other T cells arise in thymus, which provides specific inductive environment for maturation and immunological education of progenitor cells to imunocompetent T cells. iTregs arise on periphery from the conventional CD4+ T cells after stimulation by antigen under the different conditions. There is number of subpopulations of iTregs and the most important are Tr1 and Th3 cells. Tr1 cells produce big amounts of interleukin 10 (IL-10), and they are called IL-10-secretory regulatory cells, whereas Th3 cells are necessary for maintenance of peripheral tolerance to mucous surfaces, through their dominant cytokine TGF-â (transforming growth factor-â) and they are most widely spread in the mucosa of the digestive tract. Previous researches have shown that regulatory T cells achieve their suppressor activity via inhibitory cytokines, cytolysis, and induction of metabolic disorders and modulation of maturation or function of dendritic cells.

Patients with epilepsy more often than healthy individual have cognitive disorders, what may be the result of different factors, among which significant place occupy the treatment with antiepileptic drugs. Topiramate is the new antiepileptic drug, which is related with high efficiency in the reduction seazures, and also whit high prevalention of cognitive adverse events. Purpose of our study is to clarify the role of depression in developing cognitive adverse events during therapy with topiramate in patients with refractory epilepsy. In the prospective stady we followed 40 adult patients with refractory epilepsy, which treatement took place on the Institute of neurology Clinical center of Serbia. All patients are neuropsychological tested twice. First time before the start of therapy with topiramate on basic antiepileptic therapy, and next time two months after the achieving of stable dose of 200mg/day. We used neuropsychological tests for evaluation attention, concentration, visual and verbal memory, speech, executive functions, divergent opinion and visual construction abilities. For estimate degree of depression we used Hamilton's scale of depression. Patients with the depressive manifestation had lower scores on cognitive tests in comparition to patients without the depression, before and after introductions topiramate. More the score of depression was larger, the scores of neuropsychological tests have been worse. Depression has bad influence on the cognitive functioning and her presence in the patients with epilepsy increases the risk from development of cognitive adverse events of topiramate.

Strenuous exercises greatly increase oxygen consumption in the whole body, especially in skeletal muscles. Large part of oxygen consumption by the body is reduced to H O and ATP, but smaller part (2-5%) of these tremendious increase 2 oxygen consumption results in an increased leakage of electrons from the mitochondrial respiratory chain, forming various reactive oxygen species-ROS (O ˙ˉ, H O i OH˙). TheseROS are capable of triggering a chain of damaging biochemical and 2 2 2 physiological reactions such as oxidative stress and lipid peroxidatio. There is a groving number of informaztions pointing on important role of free radicals as mediators in inflamation and damage of skeletal muscles after strenuous exercise. The mechanism of exercise induced oxidative stress are not well understood. The mitochondrial electron transport chain, polymorphneutrophil and xanthine oxidase have been identified as major source of intracellular free radical generation during and after exercise. Also the interaction of metmyoglobin and methaemoglobin with peroxides may be also an importante source of oxidative stress during exercise.