Successful performance in many sports such as roller skates, often require recognition and appropriate agility, balance and self-confi dence to various situation. To achieve a high level of profi ciency and self-confi dence, good core stability can help maximize roller skates performance. The purpose of this study was to determine the effects of core stabilization exercises on selected motor profi ciency indexes (agility and dynamic balance) and self-confi dence in girl roller skaters. This is an experimental study. The population consists of the girls roller skaters between 14-16 years of age. Based on Solomon four group design, a total of 40 girl athletes were randomly assigned into four experiment and control groups. During 8 weeks each group received its own treatment and then all groups participated in a posttest. The experimental groups received experimental treatment during the experiment. The comparison of posttests indicated that experimental treatment (core stability training) has not signifi cant effect on the balance, agility and self-confi dence of girl roller skaters. It is, therefore, could be concluded that more intensity and duration of exercises are needed if the experimental treatment effect to increase the self-confi dence, balance and agility of participants in the study.

Background. Creating proper contexts to maximize sport participation of women with physical-mobility disabilities requires identifying barriers to their participation. It is essential to develop a valid and reliable tool to identify existing barriers. Objectives. The aim of the present study was to develop and validate a questionnaire for assessing barriers to participation in team sports for women with physical-mobility disabilities. Methods. The data were collected through theoretical literature, observation and semi-structured interviews with experts and professors of disability sports and women with physical-mobility disabilities selected through purposeful and snowball sampling methods. The main barriers were identified and the questionnaire was then prepared. To carry out statistical analysis on reliability and validity of the tool using factor analysis, the above questionnaire was distributed among 300 statistical samples selected by proportional stratified sampling across the country. Results. Results of factor analysis showed that it was logical to maintain 10 factors that explained 65.5% of the total variance. All items had a positive contribution to overall reliability. Conclusion. The final questionnaire (10 factors and 48 questions) was developed that could be a reliable tool for future researches, the results of which can be used by disability sport administrators to adopt policies to ensure active sport participation of women with physical mobility disabilities.

Background. Organizations are always trying to retain and empower their talented employees so that they can perform well. However, they are still afraid of losing their human capital. Objectives. The purpose of this study was to design a job retention model for swimming coaches based on talent management and the quality of working life. Methods. It was an applied descriptive-survey study. The statistical population included the swimming coaches of East Azarbaijan province (773 persons). According to the Cochran formula, 285 people were selected by a stratifiedproportional random sampling method. Data collection tools included Katajar Employees' Talent Management Questionnaire (2012), Stephen et al.'s (2015) Quality of Working Life Questionnaire and a Researcher-made Job Retention Questionnaire. Results. The results showed the direct and significant effect of talent management and quality of working life on job retention. The mediator role of quality of working life also had a mediating effect on the relationship between talent management and job retention. Finally, the proposed model has a good fit. Conclusion. Since talent management system plays an essential role in enhancing the quality of working life and job retention of swimming coaches, managers and officials of swimming federation need to do careful planning to improve the talent management system.

Introduction: Regular physical activity is considered as the first priority in healthy lifestyle. Due to the importance and role of mobility and physical activity in women's lives, the main goal of this research was to design a model for attracting females to fitness clubs by  emphasizing on the health promotion behaviors.  Methods: In this research, a combination of qualitative and quantitative methods was applied. The statistical population included all female clients of fitness clubs, who exercised in these centers for more than six previous months in Yazd. For sampling, a combination of cluster and relative methods was used. The research data were analyzed using the structural equation model through the Amos software version 23. Results: Based on the findings of the exploratory factor analysis, three effective factors of environmental (design, facilities, and health), social (administrators, family), and services (planning, advertising, cost) were identified in attracting female clients to the fitness clubs in Yazd province. The results of the model's fitness indices showed a good fitness for the proposed model. Conclusion: The findings suggest the physical fitness clubs to have more effective plans. The club managers are recommended to consider expectations of their clients, especially women and mothers to  attract more customers to their clubs.

The purpose of this research was to compare structural variations and performance of left ventricle heart of athletes in regular practice and long time practice lack. In this research, 30 female athletes were selected. Two groups of 15 females playing basketball and aged 18-29 years in regular and long time practice lack groups were formed in Khuzestan. Some variables in these two stages of test were stroke volume, ejection fraction, heart rate and end systolic diameter that were evaluated by 1D, 2D and Doppler methods in rest situation. The main result of this article is positive effect of regular practice for basketball in performance of left ventricle paid and analysed in the paper. on 30 April 2019 by guest. Protected by copyright.