AbstractAlthough it is accepted that an important correlation exists between the physical exercise and the oxidative stress status, the data regarding the levels of the main oxidative stress markers after physical training have been difficult to interpret and a subject of many controversies. There are also very few studies regarding the effects of short-time exercise on the oxidative stress status modifications. Thus, in the present report we were interested in studying the modifications of some oxidative stress markers (two antioxidant enzymes-superoxide dismutase and glutathione peroxidase, a lipid peroxidation parameter — malondyaldehide, the total antioxidant status and protein carbonyl levels), from the serum of rats that were subject to one bout of five minutes exercise on a treadmill, when compared to a control sedentary group. In this way, we observed a decrease of superoxide dismutase specific activity in the rats which performed the exercises. Still, no modifications of glutathione peroxidase specific activity were found between groups. In addition, increased levels of malondyaldehide and protein carbonyls were observed in the rats subjected to exercises. In conclusion, our data provides new evidence regarding the increase of the oxidative stress status, as a result of a 5-minutes bout of treadmill exercising in rats, expressed through a decrease in the SOD specific activity and the total antioxidant status and also an increase of the lipid peroxidation and protein oxidation processes.
Every individual in the society has a representation of it's own body in relation to the spatial cues, postural cues, time cues, etc., considered by specialists the body scheme. Throughout its development, the human being goes through different stages of organization of both the image the and body scheme. We start carrying out this study from the idea that there could be, in male individuals, a link between body representation (own image projected outwardly apparent by reference to an image presented through a questionnaire) and anthropological parameters, such as body fat and body mass index.
The study was conducted on a total of 28 subjects, aged 22.71 ± 2.62 years, height of 177.11 ± 6.76 cm and body weight of 73.56 ± 12.60 kg. For these subjects the body composition has been determined by electromagnetic bioimpendance technique and projection of the self was assesed through a questionnaire.
After analyzing statistical data, our hypothesis was refuted by the lack of mathematical connections between the variables analyzed.
We investigated the effects of a 40 min bout of bicycle exercise, and the
effects of vitamin C administration 12 h before exercise, on the serum
markers of oxidative stress in young untrained subjects. Increased levels of
malondialdehyde, the marker of the lipid peroxidation, and a decrease in
specific activity of the antioxidant enzyme glutathione peroxidase that were
observed as a result of exercise, pointed to the presence of exercise-induced
oxidative stress. These markers were reduced by pre-administration of vitamin
C. The results suggest that physically active subjects could increase their
daily dietary vitamin C intake in order to reinforce their antioxidant
defenses prior to exercise training.
Chess playing has a significant role in participants’ resources allocation, both at a psychological level, but mostly concerning the cognitive resources. The aim of the present study was to examine the effect of chess playing on the intellectual development of primary-class students. 67 children were tested using the Raven Standard Progressive Matrices and were distributed in three different groups according to their experience with chess, namely: the control group (formed by students with no experience with chess playing), the beginners group (students with less than one year in chess playing training) and the advanced group (children with more than two years experience with chess). Results indicated that chess playing had a significant effect on the SPM performance, indicating that those in the advanced group performed significantly better than those in the control or in the beginners group. Conclusions of this study tap into the benefits of playing chess with a focus on the children’s’ cognitive development.
Lactacid anaerobic efforts are frequently encountered in the practice of physical exercises by amateur athletes, while the modification of heart rate in such activities differs from one athlete to another, mainly depending on the training level. The purpose of the paper is to monitor the heart rate in lactacid anaerobic effort and to highlight the immediate modification caused by effort. 15 male amateur athletes performed the race of 200 m, at peak intensity. The modification of heart rate during effort, in 13 of the athletes, did not reach Hrmax calculated by the formula 220 – age, but it exceeded in case of two of the research subjects.
The evolution of the rugby game in recent years in Romania, has brought with it the need for updating to the morphological and functional specificity of the players. Knowledge of the somatic profile and adapting it to the game requirements, will surely determine a performance improvement. The purpose of this study is to highlight the specific strength by the morphological particularities of the players from the back line compartment. The hypothesis in this study is that the average body composition for backs falls within the standards arising from similar studies. Material and methods -the study was conducted in preseason of the competition year 2016-2017. Test players are part of the rugby team of the "Cs Politehnica Iași", newly promoted in the first Romanian rugby league.
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