درخت حوزه‌های تخصصی

Introduction: This study aimed to review the literature on the role of body composition as arisk factor for injury in an athletic population.Materials and Methods: We searched articles in English in Google Scholar Science direct,PubMed, WOS, Scopus, ProQuest, and Cochrane Library databases without time limit until2020 using keywords related to "body composition" and "sports injury".Results: Considering criteria including inclusion and exclusion, 10 papers out of 1322 studieswere comprehensively reviewed. It was found that body composition components are relatedto musculoskeletal injuries in the athletic population. Body mass index, weight and bonedensity are known as risk factors in the development of sports injuries.Conclusion: This systematic review provides preliminary evidence of the relationship between body composition and prediction of injury in athletes. Defects in various aspects ofbody composition were recognized as potential risk factors for lower extremity injuries.Likewise, body composition should be considered when screening athletes.

Purpose: The aim of this study was to compare the effect of eight weeks physical and mental rotation training on the balance and falling of elderly women. Method: The present study is a quasi-experimental study with a pre-test, post-test and two-way ANOVA, which is also t-test designed. Tools included: mental rotation questionnaire and functional reach test. The participants included: 36 patients (12 subjects in three groups of physical training, mental rotation and control group) have been randomly selected among the elderly women of an elderly Centre in Tabriz. The training program was administered in two groups of physical training and mental rotation for eight weeks, at three sessions in a week and a group of control with no intervention.  For data analysis, the SPSS software, version 21 was used. Results: One-way ANOVA showed, the mean balance among the elderly women was significantly different from the physical training group. The relationship between post-test mental rotation and pre-test physical training was significant at the 0.01 level. Also, the relationship between the post-test mental rotation group and the pre-test mental rotation group was significant at the level of 0.05 and the relationship between mental rotation and balance among elderly women is significant at the 0.01 level, at the end the relationship between mental rotations and falling in the elderly was significant at 0.05 level. Conclusions: The results of this research indicates that the physical training and mental rotation training had a positive effect on the balance of the elderly women and it also showed that the elderly women of the physical training group had more improvement on balance than mental rotation groups. So, this research indicates that, cognitive abilities and movements could be facilitating and effective in this way.

Purpose: The purpose of this research is to develop a model of the impact of service quality, brand’s social identity and the attachment to the team on the loyalty of Iranian Premier League football team’s fans. Method: This is an applied study of descriptive-correlation type. The statistical population of this study consisted of the fans of the selected Iranian Premiere Football League. A probability clustering method was used for sampling. Azadi football stadium of Tehran, Imam Reza football stadium of Mashhad, Yadegar Imam Football stadium of Tabriz and Naghsh Jahan football stadium of Isfahan were selected and the questionnaires were distributed in the 12th week of the tournament (2018-2019 season) between fans in above named stadiums. 400 questionnaires were distributed equally in four stadiums and finally, 387 full questionnaires were received and this number was considered as a statistical sample of the research. A researcher-made service quality questionnaire, brand’s social identity questionnaire of Boyle and Magnusson (2007), fans’ attachment questionnaire of Yoon, Petrick, & Backman (2017) and fans’ loyalty questionnaire of Tachis and Tzetzis (2015) were used for gathering information. Structural equation model and LISREL software were used to review and test the hypotheses. Results: The result showed that brand’s social identity has a significant positive effect on the attachment and loyalty of fans (P˂ 0.05). The attachment of fans also has a significant positive effect on their loyalty (P˂ 0.05). Conclusions: It is concluded that for enhancing fan's loyalty, managers of football teams should notice to service quality as a key factor.