درخت حوزه‌های تخصصی

Spectators are the main element of football. Football, as a popular sport, has the capacity for the intimate involvement and intense emotional experiences of the spectators. But the large presence of spectators in one place increases the probability of critical situations. Therefore, the purpose of this study is to identify crowd crisis management (CCM) solutions in professional football and to select the best solutions in terms of functional priority with mix-method. In the qualitative part, the approach based on thematic analysis was used to identify the crowd crisis management solutions and in the quantitative part, the best-worst method (BWM) was used to determine the importance and weight of the identified factors. A semi-structured interviews with 21 experts and the implementation of the best-worst method, demonstrated that among the five categories of solutions related to CCM inside the stadium, control, and guide of spectators as the most important, and emergency medical services as the least important of solutions. Also, among the solutions for managing the crowd crisis outside the stadium, the staff training of the stadium is illustrated to be the most important and financial discipline the least important solution effective for controlling the crowd crisis. Therefore, it is suggested that organizers of the matches focus on solutions that lead to the accurate implementation of the roles and tasks of the groups involved in holding the match and the development of programs, policies and effective security measures to control the spectators.

Shooters typically make great efforts to strengthen their physical and motor abilities, but are often less aware of the cognitive and psychological factors that affect their performance and skill performance. Therefore, it seems that shooters, especially novice shooters, are not very familiar with the mental skills related to shooting and pay less attention to mental training. However, cognitive training has recently been recognized as one of the basic skills required in perceptual-motor activities. The present study was conducted to determine the effect of training cognitive imaging strategies versus training of motor representation strategies on the acquisition and retention of shooting skills. This randomized controlled clinical trial study was performed on 45 undergraduate military science students with an age limit of 18 to 25 years, studying in the second semester of 1997-98. Subjects were randomly selected from a university of military sciences in Tehran and randomly divided into three groups of mental imagery, motor representation and control using a table of random numbers. The intervention groups received a three-week mental imagery training program, motor representation along with shooting training (five sessions per week). The control group only participated in shooting training. In order to evaluate the performance of shooters in the pre-test, post-test and memorization stages, a SCAT machine was used. Statistical analysis was performed using SPSS20 software and p value less than 0.05 was considered significant. The results of combined analysis of variance showed that both cognitive imaging and motor representation interventions had a significant effect on improving the record of novice military shooters (P≤0.05). The results showed that although there was no significant difference between motor representation and cognitive imaging groups in the post-test stage, however, a significant difference was observed between the motor representation and cognitive imaging groups (P = 0.006) in the retention stage. The results show that cognitive imagery and motor representation interventions can improve the performance of novice military shooters, although motor representation is more likely to be effective than cognitive imagery

Infertility is a health problem that affects about 10-15% of couples worldwide. Infertility is defined as the inability of couples to successfully conceive a child after one year of unprotected sex. The causes of infertility are often not easily identified. However, this disorder appears to be due to genetic or environmental factors, some of which may be modifiable and may be considered as a treatment option. The use of emerging infertility treatment technologies has been somewhat effective. However, these methods are very expensive and, in some cases, their success rate is relatively low. A sedentary lifestyle can lead to several disorders such as cardiovascular diseases, diabetes, cancer and conditions such as obesity. Obesity can have a negative effect on the fertility of couples. Overall, it seems that changing the sedentary lifestyle and increasing physical activity by performing regular exercise training can enhance the chances of fertility. However, it should be noted that strenuous exercise training has a negative effect on fertility.