درخت حوزه‌های تخصصی

Isomorphism is the process by which organizations become more similar to each other over time. The purpose of this study was to explore how previous research has examined this phenomenon in sports organizations. We used a semi-systematic approach to conduct the research. In conducting and reporting the review we followed the four stages that are outlined by Snyder (2019). A total of 126 articles underwent an abstract review process, from which 26 articles were extracted. Finally, 13 qualitative articles that related to the research objectives were reviewed. We conducted a content analysis of 13 articles on isomorphism in sport. The articles were published in a variety of academic journals between 1990 and 2023. 8 main themes are presented: Type of isomorphism, Mechanism of isomorphism, Consequences of Isomorphism in Sport Organizations, Function of Isomorphism, Strategies for response to pressure, institutional logics, Application of Isomorphism in Sports Organizations, Managing Isomorphism in Sport Organizations. Results showed isomorphism in sport organizations is driven by three primary mechanisms: coercive isomorphism, mimetic isomorphism, and normative isomorphism. In conclusion, isomorphism is a complex phenomenon that can have both positive and negative consequences for sport organizations. By understanding the mechanisms of isomorphism and carefully managing its effects, sport organizations can leverage its benefits while maintaining their strategic autonomy and fostering a culture of innovation and adaptation.

Football withdrawal has always created many psychological problems for players and it has had destructive effects on their health. The purpose of this study was to investigate the effects of perfectionism on the reduction stress and athletic burnout in football players. The statistical population of this study included all football players at youth level in Guilan, Iran. 378 players were selected as a sample size through random sampling method. A combination of valid and reliable standard questionnaires was distributed to collect the research data. Research hypotheses were analyzed by the Kolmogorov-Smirnov test, Pearson correlation coefficient, and linear regression. The SPSS software (version 24) was used for data analysis (α≤0.05). The results showed that there was a significant correlation between athletic burnout and positive perfectionism (-0.622), negative perfectionism (0.555), problem-oriented strategy (-0.358), and emotion-oriented strategy (0.401). According the results of this study, developing efficient plans with focusing on the psychological variables of perfectionism, stress, and athletic burnout can improve the coaches’ awareness of coaching behaviors as well as increasing athletes’ optimal mental performance and efficiency.

Background: Sports facilities are one of the most commonly used services in the city with a significant role in improving the physical and mental health condition of citizens thus a proper procedure is required to locate and distribute them. Aim : The purpose of this study is to design a comprehensive model for the optimal location of sports facilities. Materials and Methods: The research method is descriptive-analytic based on information gathering and is applied research based on objectives. The opinions of 20 experts have been used to design the model using the Delphi method, and weighting the effective criteria in the sports facilities location. The weight of each criterion has been obtained as population density (0.47), access (0.31), development potential (0.14), and adjacency (0.08); furthermore, the Kendall coefficient of concordance (0.74) in the third step of the Delphi method shows the strong agreement between the experts, regarding the proposed model. The proposed model consisted of six steps: 1. Aim; 2. Verification of the functional area of the existing sport facilities and specific restrictions of the area; 3. Introducing and weighting the important criteria in the sports facilities location; 4. Identifying the most suitable locations for constructing the sports facilities; 5. Evaluating the needs of users; 6. Selecting the best spaces and prioritizing them. Results: The results of the model showed that the most important criteria for locating sport facilities are population density, access, development potential, and adjacency. Additionally, it was indicated that the agreement between the experts increased over time. Conclusion: According to the proposed model, it is possible to identify the points that are suitable for constructing the new sports facilities.

Background: Sports and physical activity are important for the healthy growth and development of children. However, various contextual and interfering factors can hinder the development of sports and physical activity in children.   Aim : The purpose to identify the contextual and interfering factors affecting the development of sports and physical activity in children. Material and Methods: The present study adopts a combinatory approach, where the first stage is qualitative and exploratory, and the second stage is descriptive-survey. In the qualitative stage, 16 experts in the field of children's sports were interviewed using purposive sampling, and the collected data were analyzed using MAXQDA 2020 software. In the quantitative stage, SPSS software version 26 was used for exploratory factor analysis and t-tests, while PLS 3 software was used for confirmatory factor analysis. Results: The results of this study suggest that there are five contextual factors-personal and family, infrastructure and equipment, supportive, economic and managerial as well as five interfering factors-human resources, organizational, media activities, control and evaluation, and legislation. Furthermore, the results of confirmatory factor analysis indicated that the research measurement model was validated. Conclusions: In conclusion, it can be acknowledged that by considering the identified factors in the development of sports and physical activity in childhood, it is possible to address some of the challenges in the field of children's sports.

Purpose: Haematological, hormonal, biochemical and physical performance parameters were altered after long-term soccer training in professional soccer players. These alterations can be influenced by different contextual factors such as playing surface, training load, duration of training and competition. The purpose of this study was to investigate the changes in the haematological, inflammatory, antioxidant and physical performance of beach soccer players during the competitive season of the beach soccer. Method: The study examined 15 elite beach soccer players in Iranian beach soccer primer league (age 24.64 ± 4.01 y, weight 75.08 ± 8.15 kg, height 181.00 ± 5.17 cm, body mass index 22.76 ± 2.36) from the pre-season, mid-season and end-season. Measurements of haematological, inflammatory, antioxidants indices and aerobic / anaerobic power were repeated in the pre-season, mid-season and end-season. Repeated-measures analysis of variance was used to examine indicators change during league season. Results: Significant decrease in SOD (p = 0.001), TAC (p = 0.043) and anaerobic power (p ≤ 0.048) and significant increase in GPx (p = 0.001), ALT (p = 0.022) was observed from pre-season to the end of the season. LDH levels showed a significant increase in the mid-season compared to the pre-season (p = 0.042) and a significant decrease at the end of the season compared to the mid-season(p = 0.014). However, no significant changes were observed in other indices during the competition season(p ≥ 0.05). Conclusions: It is suggested that some physical and physiological fatigue markers ar increase during mid-season. Therefore, beach soccer players may be  monitored  continuously during the competition season in order to be able to provide the best training, nutrition and recovery systems for performance optimization. Coaches may use the interplay between biomarker alterations and physical performance changes to better manage workload and monitor fatigue during beach soccer training and competition.