درخت حوزه‌های تخصصی

The purpose of this study was to investigate the factors affecting the sudden buying of sportswear in sports stores in Mazandaran, Iran. This applied research has been done by descriptive-survey method. The statistical population of the study was the customers of a reputable sports store in Mazandaran province. 385 customers were selected through  available sampling method. A valid and reliable researcher-developed questionnaire was used for data collection, and structural equation modeling (SEM) was conducted for data analysis and hypotheses test. The results showed that the store environment (light, color, music, fragrance) has a positive effect on the sudden buying behavior of store customers. Moreover, the findings demonstrated that layout and physical appearance (Product availability, booth guide, product layout, building appearance, and staff coverage), as well as facilities available in the store and ancillary services (cafes and restaurants, amusement parks, child care centers), affect the psychological characteristics of customers' sudden buying behavior. By focusing on the research findings, the managers of sports stores can have a positive impact on customers’ sudden buying and improving the selling approaches.

Health and well-being have become significant dimensions of urban sustainability, particularly in countries with rapid urbanization. Community sports affect the health and vitality of society's population. Although planning for city management has existed throughout history, an integrated structure of the role of sports in urban planning to improve the quality of life and health of citizens has not yet been defined. This study aims to present a community sports planning program in metropolitan areas of Iran. The research was qualitative, and was done using the grounded theory approach based on the systematic approach of Strauss and Corbin (1998). 13 participants were purposefully selected from experts in the field of public sports development for interviewing. The final model was based on 6 categories and 36 factors. Gender and infrastructure were the most contextual factors. Cultural and underlying factors were given more attention than casual factors. Among intervening factors, media, monitoring, and evaluation got more emphasis. The categories of infrastructure and planning were mostly emphasized in the strategies section. While, in the model implementation consequences section, cultural and social consequences were mostly emphasized. Through a participatory approach to sports development, metropolitan municipalities can better understand the needs of their citizens. A bottom-up or company-centric approach allows organizers to reconstruct sports presentation models based on each metropolis. 

Given the critical role of sport managers’ behaviors in developing efficient processes in sport settings, the aim of the current study was to provide a model of sports managers’ strategic behavior. The research participants were selected theoretically through a snowball sampling approach. Semi-structured interviews were conducted with professional sport managers to collect the research data. Grounded Theory (GT) with a Systematic Approach was applied for data analysis. The results of qualitative data analysis from the interview were presented as a paradigm model of strategic behavior of sports managers in the form of six dimensions of the paradigm model, including causal condition, the main phenomenon (strategic behavior of managers), contextual condition, intervening condition, action /interaction strategy, consequences. The categorization based on the relationships between the concepts around the behavior of managers presents the paradigm model of the strategic behavior of sports managers. According to the findings, managers can eliminate many of the strategic barriers in sports organizations by institutionalizing strategic thinking and making decisions based on strategic behavior. 

Purpose: The adequate use of sport-related modern knowledge such as new findings regarding nutritional and dietary supplements is an essential prerequisite of success in modern professional sport. Methods: In this semi-experimental study, 11 nationally prominent Taekwondoin with 8 to 12 years of experience and profile of (Age: 20±6 years, height: 178±12 cm, weight: 67±11kg, wrist circumference: 17±1 cm) were selected as subjects. The level of blood lactate, the time and speed of execution of Poomsae forms, and the number of Momdollyos successfully performed in 20 seconds were measured separately in a pre-test phase, after the intake of a placebo, and after the consumption of supplement drink. Results: Statistical results showed that lactate levels significantly increased compare to pre-tests in both groups. Although this increasing was not significant between groups in Momdollyo (p=0.599) and Poomsae (p=0.303). Indeed, number of successfully executed and also time of performance were significantly different in both Momdollyo (P=0.000) and    Poomsae (P=0.033). Conclusion: Intake of discussed customized decaffeinated supplement drink increased speed and number of execution of Poomsae forms and Momdollyo techniques but it seems that lactate levels depends on other factors in taekwondoin.

The first report showing that long-term endurance exercise increases oxidative stress in humans was published more than 4 decades ago. Since this discovery, many subsequent studies have confirmed the fact that muscle activity increases the production of reactive oxygen species (ROS) and leads to oxidative stress in multiple tissues, including blood and skeletal muscle. Although several tissues may contribute to exercise-induced ROS production, muscle contractions are predicted to stimulate ROS production in active muscle fibers, and skeletal muscle is the major source of ROS production during exercise. This contraction-induced ROS production is associated with 1. oxidant damage in several tissues (eg, increased protein oxidation and lipid peroxidation), 2. accelerated muscle fatigue, and 3. activation of biochemical signaling pathways leading to adaptation. Exercise helps in tight muscle fibers, it is related. While our understanding of exercise and oxidative stress has advanced rapidly over the past decades, questions remain as to whether exercise-induced increased ROS production is beneficial or detrimental to health. This review addresses this issue by discussing the site(s) of oxidant production during exercise and detailing the health consequences of exercise-induced ROS production.

Loss of balance and postural control are the main reasons for falls among the elderly adults that are considered as serious elderly health challenges with high impacts on the quality of life. The cerebellum is involved in postural control as one of the key neural structures that receives many inputs from the sensory systems. Cerebellar transcranial direct current stimulation (ctDCS) is a popular noninvasive and safe method enabling the adjustment of cerebellar activity. Therefore, we investigated the effect of ctDCS on postural control variables among elderly population with a history of stroke. Thirty elderly individuals (60-75 years) participated in this study. After preliminary assessments of postural control strategies by post urography at six sensory conditions, they received five 20-min sessions of active ctDCS at 2mA (intervention, n = 15) or sham stimulation (control, n = 15) in a random manner. At the end of the stimulation process, postural control strategies were reassessed. After adjustment for pre-test values using the ANCOVA test, an improvement of the subjects' performance in the first four conditions was observed in the intervention group compared with the control group (P < 0.05). However, in the fifth (P = 0.24) and sixth (P = 0.58) conditions, there were no significant differences between the groups. The results of this study showed the significant effect of ctDCS on the postural control strategies. These improvements were reflected by normalization of strategy of postural control in elderly adults.

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.