درخت حوزه‌های تخصصی

Objective : The study aimed to investigate the specificity of practice hypothesis in soccer by examining the impact of environmental light conditions on the learning of a soccer push pass. Specifically, it sought to determine whether practicing under natural or artificial light would influence skill acquisition and transfer when visual conditions changed. Method: Twenty-six male students (mean age 20.67 ± 1.78 years) with no prior experience in the experimental task were matched and divided into two practice groups based on their pre-test scores in the Mor-Christian Push Pass Test. One group trained under natural sunlight (daytime), while the other practiced under artificial gym light (nighttime) for six sessions (three times per week). Following the training phase, participants underwent immediate retention tests under the same light conditions as their practice. A delayed retention test was conducted ten days later. Data were analyzed using a 2 (group: natural vs. artificial light) × 2 (test condition: natural vs. artificial light) × 2 (test delay: immediate vs. delayed) repeated measures ANOVA via SPSS-16. Results : The results revealed no significant differences in skill acquisition between the two practice groups during training. However, during transfer tests where light conditions were altered, both groups exhibited a significant decline in performance. This finding supports the specificity of practice hypothesis, indicating that skill learning is context-dependent and performance deteriorates when environmental conditions change. Conclusions : The study confirms that soccer push pass performance is sensitive to the environmental context in which it is practiced. While both natural and artificial light conditions yielded similar skill acquisition, the inability to maintain performance under altered lighting suggests that practice specificity plays a critical role in motor learning. These findings highlight the importance of training under varied conditions to enhance adaptability and transferability of sport skills. 

Background: Epidemiology studies the prevalence of a disease or injury in a particular society. In fact, the focus is on the study of injury type, body part of injury, the duration of an athlete's absence from sports, severity, treatment costs due to the injury, etc. Taekwondo is one of the most popular sports in Iran which has high injuries due to its contact nature.Aim: This study aimed to identify gaps, and address challenges in the literature on injuries among Iranian taekwondo athletes. To achieve this, the study reviewed research on taekwondo injuries among Iranian athletes, with a specific focus on the incidence rate of injuries, the most commonly injured body locations, the types of injuries, and other epidemiological indexes.Materials and Methods: To conduct the study, databases including "sid.ir", "Magiran", "Iran doc", "Google Scholar", "ScienceDirect", "Scopus", and "PubMed" were searched using keywords including "taekwondo", "taekwondo injury", "epidemiology", "injury rate", "Iranian taekwondo", "sport epidemiology" and "Iran epidemiology". Articles relevant to the subject published between 2005 and 2023 were selected for analysis, focusing specifically on studies related to the epidemiology of taekwondo injuries in Iranian athletes.Results: Total of 70 research were found. The analysis showed sprain and strain with 38.70% and bruises with 30.60% as the most reported types of injury, lower extremity injured mostly with the average of 33.12%.Conclusion: The gap of considering the injury type and severity was observed in most studies. The nature of injury and injury chronometry are of indexes paid less attention as well. Regard to the studies, injuries in the lower extremity are mostly occurred in Iranian taekwondo athletes. A study in epidemiology of taekwondo injuries included all epidemiological indexes in Iranian taekwondo athletes is necessary.

Physical inactivity is a major risk factor for non-communicable diseases (NCDs) and mortality. Encouraging individuals to be more physically active is a crucial strategy for reducing these health risks. In this context, understanding the hidden drivers behind people's mobility preferences is particularly important. Researchers use nudges as a behavioral tool to describe effective motivations in decision-making and choices, which can lead to predictable outcomes without excluding alternative options or relying on financial incentives. Using nudges in real-world conditions to promote physical activity has been the subject of various studies. However, there is still a lack of understanding of the current state and future research directions. To address this gap, this paper utilizes a bibliometric tool to analyze 119 nudge-related studies in the field of physical activity published in Scopus, providing a comprehensive overview of their structure, themes, and conceptual evolution. The analysis showed an increasing trend in research on nudges and physical activity, with a notable number of publications in 2023, especially in the field of medicine. American and European researchers have made substantial contributions, highlighting the importance of both individual and public health in developed nations. The ability of health-oriented tools to promote physical activity has also been emphasized, and some studies have investigated nudge theory in both nutrition and physical activity simultaneously. The results show that the topic of nudges and physical activity is a new interdisciplinary research area with practical implications for public health policy, and there is also considerable potential for further research in this field.