مطالب

Background: Fatigue as one of the physiological factors can affect the physical performance of athletes. This issue is more important in young athletes and can expose them to injury. Aim: The purpose of this research was to investigate the effect of functional fatigue on the performance and landing mechanics of adolescence taekwondo athletes. Materials and Methods: This was a semi-experimental study. Participants were 20 male teenage taekwondo players. Pre-fatigue measurements included side-jump tests, figure-8 hop tests, and single-leg triple jump tests, as well as a lower limb biomechanics assessment using a landing error scoring system. After the functional fatigue protocol was applied, all the pre-fatigue variables were evaluated again. In order to examine the intra-group changes of the research variables in the pre and post-test stages, the paired t-test at a significance level of P≤0.05 was used. Results: The paired-t test results revealed that following fatigue induction, performance in the side-jump and figure-8 hop tests significantly deteriorated (P<0.05). Additionally, performance in the single-leg triple hop test declined (P<0.05). Moreover, landing error significantly increased (P<0.05). Conclusion: The finding of this study indicated that after applying fatigue, the subjects' performance decreased and the biomechanical error of the lower limbs increased. Fatigue can significantly impact adolescent taekwondo athletes' performance and biomechanics. So, taekwondo coaches should implement effective strategies to mitigate fatigue, enhance athletes' conditioning, and optimize their performance in training and competitions.

Background: Cardiovascular disease is a significant contributor to mortality in diabetic patients. Despite the potential benefits of concomitant and complementary training in diabetic patients, there is a paucity of evidence in this area.Aim: The objective of this study was to investigate the effect of aerobic training in conjunction with a hydroalcoholic extract of the fruit of Qaraqat on superoxide dismutase, glutathione peroxidase, total antioxidant capacity, and malondialdehyde in the heart tissue of male rats with type 2 diabetes.Materials and Methods: 24 male rats aged 8 weeks were diabetic with a high-fat diet (60%) and streptozotocin injection. They were randomly divided into four groups: (1) aerobic training (AT), (2) supplementation (Sup), (3) Aerobic training+ supplement (AT+Sup), and (4) diabetes control (Con). The training protocol included running on a treadmill at a speed of 5-24 m/min for 10-60 min, according to the principle of overload. Glucose, insulin, insulin resistance, and MDA, TAC, GPX, and SOD of heart tissue were measured. Statistical tests of two-way variance and post hoc Bonferroni were used using SPSS software at a significance level of P<0.005.Results A significant decrease in glucose levels, insulin resistance, and MDA (P<0.005) was observed in the intervention groups following eight weeks of training and supplement intervention, in comparison to the Con group. Also, the amount of insulin in Sup and AT+Sup groups exhibited a notable decline in comparison to Con and AT groups (P<0.005), as well as a substantial increase in the levels of SOD (P=0.001) and GPx (P<0.005), and TAC (P<0.005) was observed.Conclusion: Diabetes is associated with elevated MDA levels, which are reduced by aerobic training and supplementation. Furthermore, the administration of a training intervention and the utilization of a supplement have been demonstrated to elevate the levels of SOD, TAC, and GPx.

The concept of social presence is defined as the ability of learners to identify the learning community, have a sense of belonging to the community and communicate purposefully in a learning community. The reason for emphasizing the social presence of online learning is that online and virtual learning experts believe that social constructivism is an important factor in promoting interpersonal communication and the quality of learning. Given the importance of social presence as an influential variable in the process of virtual education, it is necessary to pay more attention to this issue and its predictors. In this regard, the present study aimed to provide a causal model for predicting social presence based on cognitive presence mediated by the online learning atmosphere. Participants included 265 students of online courses of Payame Noor universities in North Khorasan province in the academic year of 2009-2010 who were selected by cluster random sampling method. In order to measure the research variables, questionnaires of cognitive presence, social presence and online learning atmosphere were used. Amos software and path analysis method were used to evaluate the proposed model. The results showed that, 1-According to the above findings, the proposed model in the RMSEA index (root mean square of estimation errors) does not fit well, so the model was modified by correlating latent variable errors and The results showed that the final model has a good fit; 2-Cognitive presence has a direct, positive and significant relationship with social presence (P≤0.05 and β=0.62); There is a direct, positive and significant relationship between cognitive presence and online learning (P≤0.05 and β= 0.14) and also a direct relationship between online learning atmosphere and social presence is positive and significant (P≤0.05 and β=0.32); 3-In the indirect way, with the presence of mediator variables, the relationship between cognitive presence and social presence was still significant and the online learning atmosphere absorbs part of the effect of cognitive presence on social presence and mediates this relationship in part .

Purpose: The purpose of this research was to compare the effectiveness of emotional intelligence training and self-compassion practices on mental well-being, academic vitality, and academic self-concept among female high school students in Hamedan. Methodology: The research method was a semi-experimental three-group design (two experimental groups and one control group) with pre-tests and post-tests. The sample was selected using multi-stage cluster sampling from the population of female high school students in Hamedan in the academic year 2023-2024, with 60 individuals randomly chosen (20 in the first experimental group, 20 in the second experimental group, and 20 in the control group). Measurement tools included the Keyes and Magyar-Moe (2003) Mental Well-being Scale and the Liu and Wang (2005) Academic Self-concept Questionnaire. MANCOVA test and its assumptions were used to test the research hypotheses. ANOVA (one-way analysis of variance) with box plot and post-hoc tests like Tukey and Scheffé were employed for multiple comparisons in the post-test using SPSS version 23. Findings: The results showed that both emotional intelligence training and self-compassion practices are effective in improving the mental well-being and academic self-concept of female high school students in Hamedan. Additionally, it was found that self-compassion training is more effective than emotional intelligence training in enhancing academic self-concept, but there is no significant difference in the effectiveness of emotional intelligence training and self-compassion practices on mental well-being. Conclusion: Psychologists can help students gain more awareness of their emotions and learn how to deal with them, set meaningful and achievable goals, increase academic vitality and motivation through realistic goals aligned with personal interests, and strengthen their academic self-confidence. Students should be taught how to cope with educational stress and anxiety, find creative solutions, and learn to utilize available resources and supports.

INTRODUCTION: The aim of the current research was to design a competency model for volunteers to be used in the IRCS and Volunteers’ Organization. METHODS: This research has a mixed approach and was conducted in two qualitative and quantitative phases. The first phase was done using grounded theory and the next phase was based on a researcher-made questionnaire. A total of 11 people including professors and experts of the IRCS who were knowledgeable and experienced about the subject were studied using purposeful sampling through semi-structured interviews. Data was analyzed by Maxqda-2022. Then, a researcher-made questionnaire was prepared using the indicators obtained from the qualitative section and given to a number of experts in the IRCS (140 people). Data was analyzed using Smartpls3 and SPSS-26 software. FINDINGS: According to the findings in qualitative section, causal conditions consist of 2 main categories and 4 subcategories; background includes 1 main category and 2 sub-categories as well as central phenomenon 4 main categories and 20 sub-categories; also, intervening conditions 2 main categories and 4 sub-categories; and the strategies 2 main categories, 5 sub-categories, and finally the consequences are composed of 3 main categories and 3 sub-categories. The results of the quantitative analysis also emphasize the positive and meaningful relationship between each of the strategies and the competence of the volunteers, which means that each of these strategies can be effective in designing and developing the competency model of the volunteers. CONCLUSION: The results indicated that the competency of RCS volunteers requires various factors such as mental image at the community level and the culture of meritocracy at the level of the IRCS and Volunteers’ Organization. In the following, the results and its consequences can be observed for the volunteers, IRCS, Volunteers’ Organization, and finally for the community, beneficiaries and the affected people. All of which depend on the use of appropriate strategies to design the competency model of IRCS volunteers.

INTRODUCTION: Disasters, both natural or manmade, have been a serious threat to human life and property for many years. The shortest response time is certainly the most important factor in increasing the survival of victims in disasters. Considering the vital importance of time in relief operations, the aim of this study is to investigate the response time in various incidents and disasters by the aid workers of the RCS by the provinces of the country during the years 2012 to 2020. METHOD: This descriptive-quantitative study is cross-sectional and data was collected by the Rescue and Relief Organization of IRCS during the years 2012 to 2020 in all Emergency Operation Centers (EOC) of the country. The variables contain the year, the province, the time interval between the occurrence of the disasters and the notification by the RCS aid workers, the time interval between their notification and presence at the scene of the disaster. The median (first and third quartile) after removing the outliers was used to report these times by year and province in the three years of 2012, 2016 and 2020. A line chart was applied to examine the trend changes during the study period. FINDINGS: The results show that the maximum minutes between the occurrence of road accidents and the notification of RCS aid worker was not reported in any province in 2012, and in many provinces, this time are equal to 5 minute. The highest mean minutes were seen 7 in Gilan province and 6 in Zanjan, East Azerbaijan, Fars, Khuzestan and Yazd provinces in 2020. Also, this figure has decreased from 5 in 2012 to 4 minute in 2020 in the country. The highest mean of minutes in 2012 and 2020 belongs to Qom province with 11.5 and 13 minute. The median of these minute has increased from 5 in 2012 to 9 in 2020. In urban accidents, the median time of notification and presence of aid workers at the scene has decreased from 5 to 4 and increased from 5 to 7 minute, respectively. On the other hand, in mountain incidents, a decrease of one minute (from 10 to 9) and an increase from 20 to 36 minute can be seen in the mean of the times of notification of the accident and presence at the scene, respectively. CONCLUSION: According to the type of disasters and the climatic and geographical conditions of the provinces, the duration of disaster relief is different and determining the standard criteria for it depends on various factors. It seems that the time between the occurrence of a natural disaster and the notification and the time between the notification and the presence at the scene in road, urban and mountain incidents are at a favorable level in the RCS.