درخت حوزه‌های تخصصی

The aim of this research was to determine the relationship among transformational leadership style with organizational culture and organizational commitment. The population consists of 745 the employees of the Ministry of Youth and Sports of Iran. The sample size of 256 staffs was determined using stratified random sampling. In order to collect the needed data, three Transformational Leadership, Organizational Culture and Organizational Commitment Questionnaires were used. The validity of these questionnaires was confirmed by foreign and domestic researches. Cronbach's alpha reliability test of transformational leadership, organizational culture and organizational commitment were respectively 0.97, 0.97, and 0.92. In addition, data were analyzed using statistical tests such as descriptive statistics, Kolmogorov Smirnoff, Pearson correlation coefficients using SPSS Software. The findings of this study showed that there was a positive and significant relationship between transformational leadership and organizational culture (p≤0.01, r= 0.80). Besides, there was a positive and significant relationship between transformational leadership and organizational commitment (p≤0.01, r= 0.46), too. Likewise, there was a positive and significant relationship between organizational culture and organizational commitment (p≤0.01, r= 0.57). However, organizational culture is stronger predictor than transformational leadership for organizational commitment. Finally, in accordance with the responses of staffs of the Ministry of Youth and Sports, it can be said that if leaders create an organizational culture in which creativity and satisfaction were high as well as to taking advantage the organizational rewards and job good conditions, employees would be able to stimulate higher levels of organizational commitment.

The aim of this research is to examine the impact of drivers and values associated with luxury sports brands on consumer behavior, considering different levels of brand equity. The study adopts a correlational design with practical implications. The target population includes all customers of luxury sports brands in Mazandaran province. Based on the Krejcie and Morgan table, a statistical sample size of 384 was determined for a large population. To achieve this sample size, 420 questionnaires were distributed, and 392 valid responses were analyzed. Data collection was conducted using a quantitative approach through the administration of four researcher-developed questionnaires, which assessed stimuli, luxury brand values, consumer behavioral reactions, and brand equity. The validity of the questionnaires was established via factor analysis, while reliability was confirmed using Cronbach's alpha. The data were analyzed using both descriptive and inferential statistics. Descriptive statistics were employed to characterize the statistical population, examine the frequency and distribution of data, define variables, and generate related charts and tables. Hypothesis testing, model construction, and other necessary analyses were performed using LISREL for factor analysis and SPSS for inferential statistics, alongside model fitting software. The findings reveal that the values associated with luxury sports brands significantly influence consumer behavior, contingent on varying levels of brand equity. It is recommended that managers of organizations and companies involved in producing both sports and non-sports brands focus on enhancing brand equity by offering high-quality luxury products that create positive experiences and appeal for consumers.

Fatigue is a common and debilitating symptom among older adults, significantly impacting their quality of life and functional capacity. The relationship between serotonin and fatigue in aging is complex, involving multiple neurobiological pathways that influence sleep, mood, cognitive function, and energy metabolism. Understanding these mechanisms is crucial for developing effective management strategies. This review aims to elucidate the role of serotonin in the development of fatigue in elderly individuals and evaluate potential therapeutic strategies to mitigate this condition. A comprehensive review of recent literature was conducted, focusing on the neurobiological mechanisms linking serotonin to fatigue, the efficacy of pharmacological and non-pharmacological interventions, and future research directions. Studies were selected based on their relevance to serotonin’s role in aging and fatigue management. Serotonin plays a critical role in regulating various physiological and psychological functions that impact fatigue. Age-related declines in serotonin synthesis, receptor sensitivity, and transporter function contribute to increased fatigue through disrupted sleep, mood disorders, cognitive decline, and altered energy metabolism. Pharmacological treatments, including selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs), have shown efficacy in alleviating fatigue related to depression and chronic pain. Non-pharmacological interventions, such as cognitive behavioral therapy (CBT), exercise, sleep hygiene, and dietary modifications, are also effective in managing fatigue. Combining these approaches may offer the best outcomes for elderly patients. Addressing fatigue in older adults requires a multifaceted approach that integrates both pharmacological and non-pharmacological strategies. Personalized treatment plans considering individual patient profiles and preferences can enhance therapeutic efficacy. Future research should focus on exploring novel therapeutic targets within the serotonergic system, developing personalized medicine approaches, and evaluating the long-term impact of combined therapies.

Background : There are conflicting findings regarding the effect of various training modalities on the cardiovascular disease mechanisms induced by undesirable modifications in extracellular matrix (ECM) factors such as MMP-9 and TIMP-1. Aim: This study was conducted to investigate the effect of different training protocols on the MMP-9 and TIMP-1 gene expression in the myocardium of Wistar male rats. Materials and Methods: Forty-eight adult Wistar male rats (aged: 8 weeks) were randomly allocated into two control (Con8w/base, n=8; and Con16w/end control, n=8) and four training groups (MICT, n=8; PICT, n=8; HIIT, n=8; and MIST, n=8). The training protocols consisted of 8 weeks (5 days/week) of Moderate-Intensity, Continuous Training (MICT: 37 min running with 65% vVO 2 max), Moderate-Intensity, Swimming Training (MIST: 30 min free-swimming), Progressive-Intensity, Continuous Training (PICT: 28 min running with a progressive increase in the incline of the treadmill by 2% per week), and High-Intensity Interval Training (HIIT: four running bouts 4 min with 90 to 100% vVO 2 max + 3 min with 50-65% vVO 2 max). Myocardial samples were isolated 24 hours after the last training session. Gene expression was determined using the real-time PCR method. All data (M±SD) were analyzed by one-way ANOVA and Tukey's post-hoc tests at α ≤0.05. Results : There were significant differences between MMP-9 and TIMP-1 expression in the animals myocardium after different exercise training protocols ( P <0.01). The lowest and highest MMP-9/TIMP-1 ratios were in the HIIT and MICT protocols, respectively. Conclusion: According to our findings, the HIIT protocol may play a more influential role in enhancing myocardial ECM-remodeling and fibrosis indicators during lifespan than the other exercise protocols.