درخت حوزه‌های تخصصی

The worldwide coronavirus pandemic has led to the emergence of different patterns of behavior in different contexts; one of the most important of these contexts is leisure. The aim of this study was to identify the concepts and categories of leisure during the coronavirus pandemic (emphasis on sports-related studies) and using a qualitative meta-synthesis method. For this purpose, after searching for resources related to the field of leisure (emphasis on sports-related studies) during the coronavirus pandemic, 169 primary sources were found and among them 36 sources were selected and analyzed. The results of a meta-synthesis of leisure studies during the coronavirus pandemic (emphasis on sports-related research) was classified into 7 main categories physical, cognitive (mental), emotional, sociocultural, economic, technology, and environmental conditions and a sports leisure model was presented during the coronavirus pandemic. According to the results of this study, if proper planning and monitoring by sports-related organizations and the media is considered, sports leisure time during the coronavirus pandemic can bring physical, cognitive (mental), emotional and sociocultural benefits for individuals and reduce the negative effects of coronavirus disease in communities. On the other the coronavirus pandemic has revolutionized leisure conditions, and in particular sports leisure, by revolutionizing technology, economics, and conditions environment.

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.

The purpose of this study was to identify and to prioritize the most important criteria to choose qualified coaches for the basketball national teams in Iran based on the perspective of sport experts, managers, basketball coaches, and elite players. Method used in this research was descriptive and survey kind. 135 participants were studied through random sampling approach according to the Morgan table. After collecting the questionnaires, 110 samples were qualified for further investigations. The data was analyzed with both descriptive statistics and inferential statistics including Kolmogorov-Smirnov test, Friedman test for finding the priority of criteria and analysis of variance test, using SPSS software. The order of the eight identified treats include “Personality and Cognitive Features, Emotional and Humanistic Characteristics, Social Characteristics, Managerial Skills, Scientific Knowledge and Expertise, Coaching Experiences, Demographic and Personal Characteristics, and Basketball Sport Skills”. Personality and cognitive features of a coach with mean rank of 6.35 is the most important factor to choose a coach (X2= 61.39, p <0.01) among the eight main criteria. Significant differences were obvious only on the last two items including “Sport skills” and “Personal characteristics” among male and female subjects.

A few second prior to an expected event, a systematic decrease in heart rate (HR), reflecting attentional processing is observed. Arousal variations however, restrain the interpretation of this decrement. The present study, aimed to investigate vigilance and arousal effects during a skilled performance separately, using separate measures for the two psychological states. HR and skin conductance level (SCL) were measured as an index of vigilance and arousal from 18 elite and 19 novices during 30 self-paced, self-initiated basketball free throws. Values of HR and SCL were calculated at half-second intervals from 10 s before to 10 s after each shot and were analyzed using repeated measures ANOVA. This helped to compare pre-shot and post-shot patterns of physiological changes separately in elites and novices. In elites, there was a slow reduction in SCL prior to, and a rebound increase immediately following the shot. These were smaller for novices. Similar findings were observed when good shots were compared to bad ones. The value for rebound after good shots reached 8 times more than the pre-shot value. A sharp increase in HR, up to 40 bpm was found 4 second before the shot, which returned to pre-shot value after 2s for elites; this did not return in novices. HR in bad shots was higher than good shots. Results indicate that the SCL reflect arousal level at the time of task and its pattern of variations reflects skill level. Although, HR was lower in good shots, the pattern of variation in HR reflected physical requirements of the task. Results were compared to previous findings and discussed in relation to the hypotheses explaining arousal and vigilance in human behavioral performance.

The purpose of the present study was to identify barriers to implementing innovation in sports clubs during the COVID-19 pandemic. The research approach was mixed. In the qualitative part, interviews with 13 owners of sports clubs were conducted. The statistical sample in the quantitative part, based on Structural Equation Modeling (SEM), included 200 sports club owners in Chaharmahal and Bakhtiari, Iran. The results showed that barriers to implementing innovation in sports clubs were individual, structural, and environmental obstacles. Considering the entrepreneurial ecosystem and all stakeholders involved in the sports community, providing favorable conditions such as intellectual property protection, financial support, research, and development support, as well as improving access to financial capital, can pave the way for the creation and implementation of sports innovations in clubs, especially in crises.