درخت حوزه‌های تخصصی

The aim of this paper was to investigate the effect of the competitive environment on brand performance of the sports goods with the mediating role of marketing strategies in Iran. The statistical population of the study consisted of managers, staff, distributors, shop assistants, manufacturers of Iranian sports goods and sport products in Tabriz. 150 subjects were studied through total sampling approach and completed the questionnaire. Structural equation modeling were conducted for data analysis. The results showed that: a) there is a positive and significant relationship between competitive environment and brand performance, b) there is a positive and significant relationship between competitive environment and the marketing strategy, and c) there is a positive and significant relationship between marketing strategies and the brand performance. The findings also demonstrated that the research model has an appropriate fitness.

Introduction:This study aimed to compare selected kinetic factors during a cross-cutting maneuver in soccer players with athletics groin pain (AGP) and healthy-ones. Materials and Method: twenty-eight soccer players (healthy group (n=14) and AGP group (n=14)) who take-part in the first division league participated in this study. A force-plate via 1000 hertz sampling rate was used to evaluate the ground reaction force, rate of force developments, vertical-impulse, and symmetry index during the cross-cutting maneuver.The independent sample t-test used to compare the results between healthy groups with AGP. Results:The results indicated the significant differences in the peak of ground reaction force (P=0.023), symmetry index (P=0.01), and rate of force development (P=0.031) in the medial-lateral direction of the dominant limb in a group with AGP. The peak of the vertical ground reaction force of none dominant limb was significantly higher in the AGP group (P=0.004). Conclusion:It seems that groin pain changes the kinetic profile, which puts the athletes at the potential risk of overuse in the lower extremities injuries. It is also recommended to utilize the output of the current study as back to sports index, and the rehabilitation progress should be continued to reduce symptoms injuries up to the proper symmetry.

Abstract Introduction: This study aimed to investigate the predictive role of psychological factors in the incidence of sports injuries (musculoskeletal) of elite male volleyball players. Methods: This was a descriptive-correlational research study design. The study was conducted with 150 elite male volleyball players in the Premier League of Khorasan Razavi province in 2020. In order to collect data, three standard questionnaires including, Sports Injuries Questionnaire (Esmaeili, 2014), Personality Traits Questionnaire (Eysink, 1975), and Competitive State Anxiety Questionnaire (CSAI-2) Rainer and Martens (1990) were used. In order to analyze the data in this study, SPSS software version 23 was used. Results: The results show that competitive anxiety can explain sports injuries (musculoskeletal) in the first model.. In the second model, when the somatic anxiety variable is added; Competitive anxiety and somatic anxiety variables can explain sports injuries. In the final model, the factors of competitive anxiety, somatic anxiety, self-confidence, risk-taking, excitement, and aggression can explain sports injuries. Conclusion: Therefore, it can be said that psychological factors play a role in the incidence of sports injuries (skeletal-muscular) of elite male volleyball players

Introduction: The return to sport after Anterior Cruciate Ligament Reconstruction (ACLR) is among the main issues encountered by rehabilitation medicine, injured athletes, and coaches. A main factor preventing safe return to sports is a biomechanical asymmetry between the limbs during reconstruction, which plays a significant role in the risk of re-injury. Accordingly, injury-related biomechanical changes were systematically examined in individuals with ACLR as performed functional tasks. Materials and Methods: Articles relevant to biomechanical asymmetries between (ACLR & uninjured) limbs in English were searched in the Google Scholar, Science Direct, PubMed MEDLINE, and Scopus databases without time limit until 2021, using the following keywords: “Anterior cruciate ligament reconstruction”, “ACL reconstruction”, “biomechanical”, “Kinetic”, “Kinematic”, and “Asymmetry”. Results: In total, 122 articles were found, of which 18 met the inclusion (PRISMA) criteria. Most of the kinetic and kinematic parameters were observed in the intervals of 3, 6, 9, 12, and 18 months after ACLR between the athletes’ vertical Ground Reaction Force (vGRF), peak hip abduction moment, peak knee valgus angle, peak knee flexion moment and angle, during the functional tasks; also changes were detected in the articles up to 28 months, although research in this area was limited. Conclusion: The present systematic review suggested that biomechanical variables may vary among the limbs of patients with ACLR, between 18 and over 28 months. Accordingly, an asymmetry between the limbs increases the risk of re-injury. Therefore, a better understanding of the biomechanics of the limbs in the time intervals after ACLR can provide a safer and sooner return to sports activities.