درخت حوزه‌های تخصصی

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: 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.

Background: Regular exercise has been shown to have a positive impact on both physical and mental health. There is growing evidence to suggest that exercise can improve mood, reduce symptoms of anxiety and depression, and increase overall well-being. Aim: This study aimed to investigate the role of ethical values and coaching styles in adherence to sports in group and individual athletes. Materials and Methods: The statistical population of the present study included 350 athletes in group and individual disciplines in Mashhad, 296 of them were randomly selected as a statistical sample. Descriptive and inferential statistics were used for statistical analysis in the present study, which was done using SPSS 23 (Chicago) and LISREL 8.80 software. Results: The results of the Kolmogorov-Smirnov test showed that the research data have a normal distribution. The analysis results showed a significant relationship between coaching style and its components with adherence to sport and between ethical values and its components with adherence to the sport. Also, the regression analysis results showed that ethical values and their components and coaching styles and their components have the ability to predict adherence to the sport. Conclusion: Finally, it was found that the structural equation model of the relationship between ethical values and adherence to sport and coaching styles and adherence to the sport has a significant fit. According to the results of the research, it can be said that coaches and those involved in sports can, by properly explaining and presenting ethical values, as well as the correct use and application of coaching styles, encourage people in the community at all levels and especially athletes to adhere to physical activity and exercise.

Given the importance of desert sports in the development of sports tourism in desert areas, the purpose of this study was to assess the effect of destination image on satisfaction and revisit the intention of desert sport tourists in the Lut desert of Iran as a desert sport destination. The research population was sport tourists who had visited the Lut desert (in Iran) in 2020. 208 valid and reliable questionnaires were distributed among the research samples that were selected through a convenience sampling approach. The model validity and the relationships among research variables were verified by using structural equation modeling with PLS. The research findings demonstrated that destination image of a desert sport destination has influenced desert sport tourists’ satisfaction and their revisiting intention. Moreover, tourists’ satisfaction had a significant effect on tourists’ revisit intention. The findings of this study can lead to a better understanding of behavioral mechanisms that can provide reliable principles for maintaining and developing sport tourism in desert sport destination destinations.