درخت حوزه‌های تخصصی

Background : There are conflicting findings regarding the effect of various training modalities on the cardiovascular disease mechanisms induced by undesirable modifications in extracellular matrix (ECM) factors such as MMP-9 and TIMP-1. Aim: This study was conducted to investigate the effect of different training protocols on the MMP-9 and TIMP-1 gene expression in the myocardium of Wistar male rats. Materials and Methods: Forty-eight adult Wistar male rats (aged: 8 weeks) were randomly allocated into two control (Con8w/base, n=8; and Con16w/end control, n=8) and four training groups (MICT, n=8; PICT, n=8; HIIT, n=8; and MIST, n=8). The training protocols consisted of 8 weeks (5 days/week) of Moderate-Intensity, Continuous Training (MICT: 37 min running with 65% vVO 2 max), Moderate-Intensity, Swimming Training (MIST: 30 min free-swimming), Progressive-Intensity, Continuous Training (PICT: 28 min running with a progressive increase in the incline of the treadmill by 2% per week), and High-Intensity Interval Training (HIIT: four running bouts 4 min with 90 to 100% vVO 2 max + 3 min with 50-65% vVO 2 max). Myocardial samples were isolated 24 hours after the last training session. Gene expression was determined using the real-time PCR method. All data (M±SD) were analyzed by one-way ANOVA and Tukey's post-hoc tests at α ≤0.05. Results : There were significant differences between MMP-9 and TIMP-1 expression in the animals myocardium after different exercise training protocols ( P <0.01). The lowest and highest MMP-9/TIMP-1 ratios were in the HIIT and MICT protocols, respectively. Conclusion: According to our findings, the HIIT protocol may play a more influential role in enhancing myocardial ECM-remodeling and fibrosis indicators during lifespan than the other exercise protocols.

The present study was conducted with the aim of designing a model of barriers to the advancement of sports justice in  schools of deprived areas with a mixed method. The present study was a sequential exploratory research and a survey one. The research population in the qualitative section included sports teachers in deprived areas that were purposefully selected for qualitative interviews (interviews with 15 participants until reaching the theoretical saturation). The research population of the quantitative section consisted of 181 sports teachers . The data collection tool in the present study was a semi-structured interview and a researcher-developed questionnaire. In order to analyze the research data, coding in the qualitative part and structural equation method in the quantitative part were conducted. In the qualitative part, 25 concept codes and 5 main categories were extracted. In the quantitative part, all 5 main extracted categories (economic, manpower, management, infrastructure, motivation) had a proper fitness.

Sports facility management is debatable from several angles, such as design principles, safety, and health principles, sizes and standards, and supervision, among which optimal location and determining the appropriate location to build sports facilities is one of the most crucial and specialized categories. The purpose of this research is a review study of sports places site selection with geographic information system. To achieve the research goal, a review study was conducted on the issue of locating sports venues with GIS. Google Scholar, SJR, and SID databases were reviewed to extract English and non-English language articles on locating sports venues with GIS. The researches conducted from 2007 to 2023 were reviewed in this study. The search was conducted in December 2022 and led to the identification of 565 records. After two steps of ‘screening’ and ‘eligibility’, 17 researches have met the criteria and were included for data analysis. Findings demonstrated that GIS has become very prosperous in the world, huge sums of money are spent to prepare these systems, and it is predicted that billions of dollars will be spent in this field in the future.

Transference of professional sports clubs to private sector involves the necessary conditions for private sector activity. Therefore, the aim of this study was to determine the prerequisites for the transference of professional football clubs in Iran with emphasis on economic requirements. Statistical population included all CEOs and members of board of directors from professional football clubs, chairmen of committees and officials of provincial football boards, sports management and economics professors as well as football reporters. The research tool was a valid and reliable researcher-developed questionnaire. Factor analysis and Friedman ranking test were employed to analyze the research data. According to the results, the prerequisites for privatization were categorized in seven factors including cultural, executive, programming, motivational, legal, economic, and structural. Moreover, economic requirements (4.20) were the most important category, followed by executive (4.14), structural (4.04), motivational (4.02), legal (3.99), programming (3.97), and cultural requirements (3.62), respectively. Among the economic requirements, the transparency of financial information from country's football clubs, presence of strong sponsors and the creation of supportive funds for financial guarantee of private sector are in the first to third ranks, respectively. According to the findings the most important priority is to solve the financial problems and revenue generation of the clubs.