درخت حوزه‌های تخصصی

This study investigates what effect stadium elevation has on the win-loss performance of home teams in major college football. Despite extensive research on factors that influence home-field advantage in sports, the potential impact of altitude on the performance of college football teams has not been thoroughly explored. Therefore, the purpose of this study is to compare the records of institutions playing home games at the highest elevation stadiums with national averages. In contrast to its effect on sports like international soccer or running, results indicate that teams playing in stadiums at higher elevations have no significant difference in win-loss percentage than the national average as findings suggest that altitude does not play a significant role in the performance of FBS teams. Unlike soccer teams playing in high-altitude cities or runners training in the mountains prior to racing at lower levels, this study concludes that playing in stadiums located at higher elevations does not significantly impact win-loss percentage of college football teams. This study contributes to the understanding of the factors that influence home-field advantage in college football and the limited impact of altitude on college football.

Background: Perturbation training which is in the context of volleyball routine practice is a type of neuromuscular exercises that is useful in overhead sports; leads to contraction responses through unpredictable perturbation. Aim : The present study aims to investigate the effects of perturbation training on volleyball players strength proprioception and performance. Materials and Methods: Twenty-four volunteer male volleyball players (age: 24.42±2.15 years; height: 181.46±3.00m; Weight: 73.87±3.77kg; BMI: 22.43±0.80) were recruited and randomly assigned into perturbation and control groups, Before the intervention, a set of isokinetic dynamometry was carried out to measure shoulder proprioception as well as rotator cuff muscles strength, what is more, the upper extremity performance was evaluated using Y-Balance Test. For a course of 6 weeks, players of the perturbation group implemented perturbation trainings, 3 times weekly while the control group performed its routine training. The dynamometry was repeated at the end of training period to compare trainings outcome. The Repeated Measures ANOVA statistic was used to find differences between groups. Results: A significant difference in shoulder proprioception, as well as the YBT-UQ test, was observed between the groups; Also, the ANOVA showed a significant difference ( P <0.05) in functional strength ratio followed by 6 weeks of perturbation training. Conclusion: Perturbation trainings might have benefit to volleyball players conditioning by improvement rotator cuff strength, shoulder proprioception and upper extremity performance. Given this adopting kind of training as a part of regular basic training for volleyball players is highly recommended.

Football stadiums are the main infrastructures of this popular sport in the society. The purpose of this study is to provide a Pattern for cultural promotion in football fans in stadiums in Iran, which was done by qualitative research method and using grounded theory approach. Through snowball sampling and by conducting 21 semi-structured interviews with university professors and experts in football and culture theoretical saturation was achieved. The results of data analysis in 3 stages of open-coding, axial-coding and selective coding indicate 28 categories that these findings are within the framework of the final model including: Hooliganism, behavioral factors, media, managerial challenges, infrastructural factors and Juridical and legal as causal factors; the nature of football, advocacy and government actions and policy making as context factors; Celebrities, social contexts, economic conditions, Trends and interest, cultural and social and technology as an intervener; manpower, education and training, media, cyberspace, structural strategies and Infrastructural strategies as appropriate ways to promote the level of culture in football fans in stadiums as strategies. According to the proposed pattern, promoting the cultural level of the spectators, marketing development, Exercise promotion, financial development, social progress, the growth of moral security and growth of behavioral security in Iran can be mentioned as positive consequences of promoting cultural levels in football fan in stadiums.

Introduction: The present study aimed to compare hip muscle resistance training with and without feedback on trunk, pelvis, and lower extremity motions in frontal and sagittal planes among active females with dynamic valgus. Materials and Methods: Twenty-Nine active females (Mean±SD age: 22.8±2.4 years, height: 1.70±0.6 m, weight: 69±7.1 kg) were randomly assigned to a hip muscle resistance training with feedback group (n=15) or a hip muscle resistance training without feedback group (n=14). Both training programs lasted 6 weeks (3 sessions/week). The peak angles of lateral trunk flexion, contralateral pelvic drop, hip flexion, knee flexion, and valgus during single-leg drop landing and single-leg vertical drop jump were assessed in the research participants at baseline and 6 weeks post-training. Unipodal functional screening tests were captured with two standard digital video cameras. Results: After 6 weeks, significant differences were observed in knee valgus and lateral trunk flexion, contralateral pelvic drop, and knee flexion angles, i.e., compared between hip muscle resistance training with feedback and hip muscle resistance training without feedback (P<0.05), except for non-dominant leg hip flexion in single-leg vertical drop jump (P>0.05). Conclusion: In the explored active females with dynamic valgus, hip muscle resistance training with feedback seems to be better at improving trunk, pelvis, and lower extremity motions in frontal and sagittal planes, compared to hip muscle resistance training without feedback; however, no significant difference was observed concerning hip flexion during single-leg vertical drop jump between the study groups.

The aim of this study was to investigate the factors affecting social loafing in sports leisure time of university students in Mashhad (Firdausi Mashhad and Imam Reza). The research method was descriptive-survey in terms of propose and field based in terms of the data collection. The statistical population consisted of male student-athletes of Mashhad universities from which 118 were randomly selected as statistical samples. The research instrument included a researcher-made questionnaire based on research background, the validity of which was assessed by six professors in the field of sports science and its reliability was also assessed by Cronbach's alpha test (0.84). Based on the results, the items of socio-sports loafing for students constitute 50.20% of the total variance and the model for assessing the causes of socio-sports loafing of students, based on the results of factor analysis, has appropriate validity. Moreover, there is a significant correlation between the causes of socio-sports loafing (dodgery, felling of self-inferiority, group characteristics and egocentricity) in students (P <0.01). Furthermore, the results of all factors are higher than the average. Considering the relative importance for each of the studied factors among athlete student, it seems that one of the important reasons for such a fact is the change in lifestyle and the tendency of people to use modern technologies, which reduces the activity of people in society, especially young people, young athletes and young students. Many of these people, due to their strong presence in virtual activities, are less inclined to do group work and are more likely to perform individual actions and achieve their personal goals.

The aim of this study was to evaluate Sustained Attention Performance and Reaction Time in Shooters of National Rifle, Pistol and Trap Teams and compare these groups with each other. In this causal-comparative study, 33 players of men national teams, including 11 from rifle team, 11 from pistol team and 11 from trap team were selected by available sampling method and evaluated using continuous computer performance test. Covariance method was used to compare the variables of continuous performance test including (number of errors and reaction time) between the three groups. The results showed no significant difference in the performance of sustained attention and Reaction Time between the three groups ( P > 0.05), despite the superiority of the trap group in both components. Based on the findings of the present study, the performance of sustained attention and reaction time in the shooters of the national teams of rifle, pistol and trap is equally important. These findings can be justified by the similar nature of different shooting disciplines in the use of sustained attention and reaction time.