مطالب

Background: Drop landing is one of the tasks performed in many sports skills. Lower limb injuries have the highest prevalence in sports where jump landing is repeated frequently. One of the most common landing injuries is an anterior cruciate ligament (ACL) tear, which increases knee valgus and may contribute to an increased risk of ACL injury in athletes. In this situation, fatigue is one of the components that can affect various parameters of the landing task. Aim: The purpose of this study was to investigate and compare the acute and delayed effects of fatigue on the time to stability (TTS) of female gymnasts with and without dynamic knee valgus (DKV) during the landing task. Materials and Methods: In this semi-experimental study with a pretest-posttest design, 42 female gymnasts were selected through purposive and available sampling and divided into two groups of 21: a control group without DKV and an experimental group with DKV. The TTS in these individuals was measured before, after, and 24 hours after the fatigue protocol using the Kistler force plate device. The data was analyzed using SPSS software and statistical methods of analysis of covariance with repeated measures at a significance level of P ≥0.05. Results: According to the findings of this study, it showed that there is a significant difference in the variable of TTS in three time periods (before, after, 24 hours after fatigue) in the control and experimental groups ( P = 0.026). Conclusion: The results of the present study showed that plyometrics on the TTS are significantly different between people with DKV and without DKV, and people with DKV are necessarily at a greater risk of injury during landing tasks.

Purpose: Osteoporosis is a decrease in bone density among older adults that can cause painful fractures and disability. One of the most important effective non-pharmacological interventions is having appropriate and continuous physical activity.  The aim of this study was to investigate the relationship between serum calcium and alkaline phosphatase with femur bone mineral density in active and inactive men. Method: This study was semi-experimental. 35 active and 35 inactive elderly men aged 65 to 80 years with medical records were selected. Anthropometric characteristics, serum calcium and alkaline phosphatase of subjects were used as effective indicators of osteoporosis. Pearson's correlation coefficient was used to find the relationship between femur mineral density and serum calcium and alkaline phosphatase, data analysis was done using SPSS version 26 Software. Results: The results of this research showed that in both groups of active and inactive men, there was a significant relationship between serum calcium and alkaline phosphatase and femur mineral density (P≤0.05). No significant relationship was found between the height index and mineral density of the femur (P≥0.05). Conclusions: In general, the results show that there is a significant relationship between bone density and weight, age, calcium, phosphorus, and serum alkaline phosphatase of all subjects, and the effect of exercise on other bone density indicators can be investigated.

Hedging and boosting are significant communicative resources to construe and attain persuasion in different fields and particular genres of academic writing. Hedges allow the researcher to address possible problems, raise objections or anticipate opposition to the research claims while contributing something new to the ongoing dialogue in a research field. Boosters enormously help to achieve the essential writers’ need to convince their readership of the truth in their propositions. They are mainly used whenever writers consider it not too risky to include them in their propositions. This study aims to investigate the frequencies and functions of hedges and boosters in academic students' essays. To meet this end, 96 students' essays (a total of 269.428 words) were selected from the Michigan Corpus of Upper-Level Student Papers (MICUSP), including English and Psychology disciplines. The corpus was analyzed based on Abdollahzadeh (2019)classification of hedges. The results showed that hedges and boosters were frequent enough to be considered in teaching writing, either reducing or increasing the force of written utterances. The results of this study could be used directly in the syllabus designed for academic essay writing.

Background : Internationalization of sports leagues can have several benefits, including increased exposure to a global audience; improved competitiveness; and enhanced financial opportunities and cultural exchange. Overall, the internationalization of a sports league can help it grow, become more competitive, and reach a wider audience, leading to benefits for both the league and its fans. Aim: The main objective of this research was to develop a model of challenges affecting the internationalization of the Persian Gulf Pro League (PGPL). Materials and Methods: We conducted twenty in-depth interviews with expertise involved in the functioning of the PGPL who were recruited using a convenience sampling method. The data was analyzed using grounded theory method, including open, axial, and selective coding. During the analysis, we identified 85 codes that generated 49 general concepts. Subsequently, through further reviewing the concepts and their combination with each other, we identified twenty tow final categories that affect the internationalization of PGPL. These categories were classified into five main dimensions: political-economic; managerial; legal; technical-marketing and socio-cultural. Results : According to the research findings, it is necessary for the Iranian football managers and practitioners to first address the challenges affecting the internationalization of the PGPL and then provide the required conditions and platforms with attitude-behavioral alignment to move toward internationalization. Conclusion: The study suggests that Iranian football managers and practitioners need to address challenges hindering the internationalization of the PGPL and provide the necessary conditions and platforms to facilitate the process. By doing so, the PGPL can expand its presence and competitiveness in the global football industry, leading to growth and success.

Background: Telomerase activity plays a key role in preserving telomere length which is important in cellular aging. There is evidence showing the link between sirt6, irisin, and telomerase activity.   Aim : The aim of this study was to compare the effect of 8 weeks of high-intensity interval training (HIIT) and aerobic continuous training (ACT) on telomerase activity, sirt6, and irisin levels of healthy older adults. Materials and Methods: Thirty healthy males (age: 60-70 years, weight: 68-72 kg) participated voluntarily to follow the 8-week program including 3 sessions per week. Rest ratio in HIIT training was 1:2 and the intensity corresponded to 90% of HRR. ACT intensity was progressive starting with 50% of HRR and finishing with 70% of HRR. Blood samples were taken in a 12-hour fasting situation, before and after the program. Results: Results showed a significant effect of training on serum telomerase and sirt6 in training groups, not the control group. Also, in comparison to ACT and the control group, serum irisin was significantly higher in the HIIT group. Conclusion: We concluded HIIT training is safe and efficient for older adults in terms of telomerase activity, sirt6, and irisin level and can be followed as a time-efficient training protocol.

Purpose : The present article has been written to review studies in the field of social media evolution in human resources and the gaps in this research. This review paper is expected to motivate further research initiatives regarding the role of social media in different HRM practices. Method : The paper is based on 98 published papers collected from the Web of Science Database particularly from 1975 to 2021 (up to NOV) using VOSviewer software. Findings : After reviewing the paper contents, the author briefly highlighted the findings. According to studies, the results show that the issue of change has shifted to Transformation 4.0 in Media and HRM 4.0 in recent years. An approach that refers to concepts such as social networking and digital media. The results also show that traditional approaches to social media before 2018 are more related to Communication, Communities, Goals, Behavior, and so on. In recent years, concepts such as Technology, ACTIVISM, INTERNET USE, Facebook, Culture, etc. are related. Conclusion : The author expects that based on the findings; the organizational policymakers can get some practical guidelines regarding the efficient utilization of such a platform. In particular, the media can be a well-established platform for searching for competent employees and creating employer branding. Therefore, more and more research studies should be carried out focusing on this recent issue.

Purpose: Educational activities play an important role in the growth and flourishing of talents and abilities. As a result, the current research was conducted with the aim of evaluating the model of implementing educational activities in the preschool period. Methodology: This study in terms of purpose was practical and terms of implementation method was qualitative from type of exploratory. The statistical population of the present study was all the preschool period teachers in the east of Tehran province, numbering 1830 people who based on Cochran's formula the sample size was estimated to be 318 people who were selected by multi-stage cluster sampling method. The data was collected with a researcher-made questionnaire of educational activities in the preschool period with 110 items and its face validity was confirmed by the opinion of 30 experts and its reliability was evaluated suitable by Cronbach's alpha method. Data were analysed by exploratory factor analysis and structural equation modelling methods in SPSS and AMOS software. Findings: The results of exploratory factor analysis showed that the model of implementing educational activities in the preschool period had 110 indicators in 20 components and 8 dimensions. Its dimensions and components were included goals (with 2 components of general goal and partial goal), content (with 5 components of children's educational ability, analysis ability, content comparison ability, content recombination and content production training), teaching and learning strategies (with 2 component of teaching characteristics and teaching techniques), learning activities (with 2 components of personalized learning and active learning), grouping (with 3 components of individual characteristics of the child, various forms of group activities and emotional and social characteristics), resources (with 3 components of required resources and facilities , characteristics of resources and materials and use of visual resources and materials), evaluation (with 1 component of child evaluation characteristics), time and place (with 2 components of time management and space management) which their content validity ratio was calculated higher than 0.70 and their reliability with Cronbach's alpha method was calculated higher than 0.70. Conclusion: The confirmed model of implementing educational activities in the preschool period of the current research can help the specialists and planners of the education system in designing and implementing programs to improve the educational activities in the preschool period.

Purpose: While it is true that concern should be expressed with the incessant conflicts in Africa, it is also true that the ramifications are very wide. One recurring conflict in the 1990s Nigeria’s educational institutions is the conflict generated among rival cult groups that seemed to defy solution. Several students and, in some cases, lecturers have lost their lives yet there seems to be no end to these killings which seem to occur unexpectedly. Methodology: Applying a sub-cultural group theory, this article analyzed the prevalent factor responsible of this phenomenon. Starting with the analysis of the relations between what it takes to survive in Nigeria and the emergence of violence on campuses of institutions of higher learning, the article suggests that the failure of higher institutions to effectively perform its integrative role, thereby becoming a space for delinquent gang groups, may be connected to failed economic policies. Findings: it argues that it may not be totally true to call the various students groups involved in the on-campus conflict ‘cult’ as their activities and rituals are devoid of any spiritual or religious elements but more about contestations about space and survival. It concludes by suggesting some probable solutions. Conclusion: the educational institution needs to rethink the curricula in relation to the survival of the society wherein what is taught is not based on ‘individualistic but communal virtues.