درخت حوزه‌های تخصصی

Research shows that narcissistic traits such as self-conceit and entitlement are associated with delinquency and aggression in childhood and adolescence. Therefore, the purpose of the present study was to investigate the relationship between narcissism and tendency to abnormal behavior and assertiveness with the mediating role of mindfulness among active students. The present study was a cross-sectional study of correlation with structural equation modeling. The statistical population was all male students in the second year of high schools in Torbat Heydarieh city, Northeastern Iran, in the academic year 2022-2023. According to the Morgan table, the size of the statistical sample was estimated to be 200 active male students who were selected stratified random sampling method. The data collection tools included Baer et al.'s Five Facet Mindfulness Questionnaire (FFMQ) (2006), Narcissistic Personality Inventory (NPI-40) from Raskin and Terry (1988), Rostami and Rad's Abnormal Behavior Tendency Questionnaire (2012), and Kotler and Giura's Assertiveness Questionnaire. Data analysis was done using structural equations with PLS version 3 software. The findings showed that there was a positive and significant relationship between narcissism and tendency to abnormal behavior, and there was no significant relationship between assertiveness and tendency to abnormal behavior. The mediating role of mindfulness on the effect of assertiveness and the tendency to abnormal behavior was confirmed, but the mediating role of mindfulness on the effect of narcissism on the tendency to abnormal behavior was not confirmed. In order to reduce the tendency toward abnormal behavior in active students, it is recommended to strengthen assertiveness by mindfulness training, as well as designing educational and behavioral therapy programs to control narcissism.

Background and purpose: Caffeine is a widely used and available physiological stimulant that is effective in sports performance. The purpose of this study was to investigate the effect of caffeine consumption and exercise on fatigue and cardiovascular responses in active men.Materials and methods: The statistical population of this research was made up of all male students of physical education in the age range of 19 to 27 years with at least three activity sessions per week. 15 of them were selected as subjects and they performed the exercise protocol in two stages (the first stage by eating placebo and the second stage by eating coffee). Subjects consumed 5 mg/kg of coffee in the first session under placebo conditions, and in the second session, subjects consumed 5 mg/kg of coffee one hour before the test. Blood samples were collected before taking placebo or caffeine and after the test. Findings: The results of the correlated t-test showed that the consumption of caffeine supplements significantly increased the time to reach fatigue and the index of oxygen consumption after exercise. In general, it can be said that active men can use 6 mg/kg of caffeine supplement one hour before sports activity to improve the time to reach fatigue.

The purpose of the present article is to design indicators and variables that represent the value of volleyball players. This research method is applied, which was done in a quantitative and qualitative way. The research tool was a semi-structured interview with experts in the field of player valuation. In this research, the statistical population included all the experts and specialists in human resources and financial management issues in sports, and also volleyball experts. The sample size included a number of volleyball sports experts who expressed their ideas to determine the variables. A total of 60 variables were extracted, of which 40 are quantitative indicators and 20 are qualitative indicators. These indicators are not only effective in the selection of players, but can also determine the price and final value of the players.

The purpose of this study was to investigate the effect of market orientation on the job attitudes of employees in sports stores in Mazandaran, IRAN. This research was a descriptive-correlational and applied study. The statistical population consisted of all employees in Nike, Adidas, Reebok, Puma, and Majid sports store. Based on Structural Equation Modeling (SEM), the research sample included 200 subjects. Standard questionnaires were used for data collection. Linear regression and structural equation modeling (SEM) with Spss18 and Lisrel version 8.3 software have been used to investigate the research hypotheses. According to the research findings, market orientation affects employees' attitudes toward the sports stores and market orientation explains 69 percent of the variance of job attitudes. Moreover, market orientation components were effective on job satisfaction, organizational commitment, role conflict, and turnover intention. Market orientation components were also effective on job attitudes of the sports store employees. Therefore, the special attention to market orientation in promoting productivity, satisfaction and increasing commitment of employees, can be critical in achieving the goals and strategies of sports stores.

Background: Limited research has investigated the use of chamomile as an antioxidant supplement in team sports . Purpose : The aim of this study was to investigate the effect of chamomile extract on antioxidant indices in young female futsal players. Methods : 20 young female futsal players (Average age: 22.08 ± 5.03 years, weight: 54.4 ± 8.62 kg, and body mass index: 20.56 ± 2.6 kg/m2) were divided randomly into two groups, experimental group (10 people) and control group (10 people). The experimental group consumed 1500 mg/day of the supplement for one week, while the control group received a placebo. Both groups were nutritionally controlled during this period. After the end of the intervention period, two simultaneous futsal matches were held for two groups (two teams of 5 players in each match). Anthropometric characteristics were evaluated in resting conditions and biochemical markers were measured before the intervention, immediately after the competition, and 30 minutes after the competition. Data analysis was performed using the repeated measurement variance test. The level of significance was considered at P<0.05. Results : The results showed a significant increase in SOD levels (P<0.05) and a significant decrease in CAT levels (P<0.05) immediately after the competition in the supplement group, but this significance was not seen 30 minutes after the competition. Conclusion : One-week consumption of chamomile improves antioxidant defense in young female futsal players. Conducting studies with long-term follow-up to confirm these findings should be considered.