درخت حوزه‌های تخصصی

Purpose: High-intensity interval training (HIIT) is an effective training method for improving the aerobic and anaerobic power of athletes; however, the role of activity volume in high-intensity interval training efficiency is still unclear. Therefore, in the present study, the effects of low- and high-volume HIIT on aerobic power, anaerobic power, and lactate response in young soccer players were compared. Method: In this study, 24 professional soccer players aged 20 to 22 who had no history of illness or taking supplements were chosen and randomly assigned to two groups of high-volume and low-volume HIIT. High-intensity interval training was completed for eight weeks. Training sessions included 5 min of warm-up, the main training phase, and cooling down. The training phase in the first week included 8 repetitions of 15 s of running with maximum power and 15 s of rest. Every week, the number of repetitions was increased by two. High-volume interval training was conducted for six sessions per week while low-volume interval training was performed for three sessions per week. After the training intervention, aerobic power was measured using the one-mile running test, and anaerobic power was evaluated using the Running-Based Anaerobic Sprint Test (RAST). Moreover, the level of blood lactate resulting from the RAST test was also measured using a lactometer. To statistical analyses repeated measure ANOVA was used. Results: Blood lactate levels were reduced by 12% (p=0.001) in the high-volume interval group and by 10% (p=0.001) in the low-volume interval group in response to exercise. In addition, statistical analysis revealed that the blood lactate levels in response to exercise after 8 weeks of training were similar in both groups. On the other hand, despite the rise in aerobic and anaerobic power in both groups, there was no significant difference in aerobic and anaerobic power between the high-volume and low-volume groups after eight weeks of interval training. Conclusions: Overall, the findings of the present research indicated that high-intensity interval training will reduce lactate and increase aerobic and anaerobic capacity, regardless of the training volume.

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.    

This study aimed to examine the challenges and opportunities of sports stakeholders in social media use. This study uses thematic analysis to analyze the literature on the research topic. Furthermore, semi-structured interviews were conducted with three groups of sports stakeholders, including players (N=15), teams managers (N=14), and fans (N=26) that were chosen from three professional football teams. The phenomenological method was used to explore the research questions. The study addressed seven categories of sport stakeholders' challenges and opportunities in social media: informing sports stakeholders, sharing information, advertising, shopping, dialogue, and facilitation of communication, which are offering opportunities. Moreover, two challenges, including unpleasant feelings and time consumption, are recognized as dilemmas. The findings showed common challenges and opportunities of all three sports stakeholders in using social media.