Search

Background/Objectives: Today’s high school students often engage in sedentary behavior by choosing passive activities during leisure time. Increasing research shows that regular physical activity (PA) provides benefits beyond physical health, especially important during childhood and adolescence. Our study investigated the association between physical activity levels and academic performance (AP) in Serbian adolescents. Methods: We selected a sample of 836 fourth-grade high school students (avg. 17.9 ± 0.7 years old) who completed the IPAQ (short-version) and the Academic Performance Scale. Data analysis was conducted using IBM SPSS 21.0. Due to non-normal data distribution, Spearman’s correlation was used and hierarchical regression analysis to assess the association between PA and AP. Results: The findings revealed significant correlations between vigorous, moderate and light PA, as well as overall units of metabolic equivalent of task (METs), with AP (p-values: 0.000, 0.005, 0.021, 0.004, respectively), although with weak correlation coefficients (0.127, 0.098, 0.080, 0.181, respectively). Vigorous PA influenced AP by 10.1%, moderate PA by 8.2%, and light PA by 11.4%. Conclusions: These results suggest that adolescents engaging in higher PA levels tend to have better AP. This finding indicates a substantial association between PA levels and AP, with both moderate and vigorous PA showing a positive correlation and influence. Further investigation is necessary to comprehensively grasp the link between light PA and AP.

Sports anxiety is an important obstacle for athletes' performance, negatively affecting their life satisfaction levels. Positive thinking skills can contribute to overcoming such negative conditions. This study explored the relationships between sport anxiety, positive thinking skills, and life satisfaction in male athletes. A total of 338 male athletes participated voluntarily, using convenience sampling. The study employed a relational survey model, and data were collected through the Sports Anxiety Scale-2, Positive Thinking Skills Scale, and Life Satisfaction Scale. Analyses, including Pearson's correlation, were performed using the JAMOVI program, with mediation analysis verified through bootstrapping. Results indicated a negative correlation between sport anxiety and life satisfaction, and a positive correlation between positive thinking skills and life satisfaction. Moreover, positive thinking skills were found to moderate the relationship between sport anxiety and life satisfaction. These insights underscore the value of developing positive thinking skills to help athletes reduce anxiety and enhance their life satisfaction. Therefore, incorporating strategies to foster these skills in training programs could be crucial for improving athletes' overall wellbeing. [ABSTRACT FROM AUTHOR]

The objective of this research was to examine the Love-Hate and Identification Relationship of Individuals Participating in Euroleague Match for Recreational Purposes. The study was conducted using a relational survey methodology. The study's population comprises persons who watching recreational purpose part in the Euroleague match held in Istanbul in 2023–2024 season, while the sample consists of 178 voluntary participants selected through convenience sampling. The participants completed the Fan Love-Hate Scale and Fan Identification Scale, in addition to being asked about their gender, marital status, age, educational status, and frequency of attending football matches per week. The data collected from the personal information form and scales was entered into the IBM SPSS 24.0 software package for analysis. Statistical analyses were conducted using the Independent Sample T test and One-way Anova methods. The LSD test was employed to ascertain the dissimilarity between the groups. The Pearson correlation analysis was utilized to ascertain the association between the variables of love-hate and identity. In summary, it is evident that demographic factors, including gender and age, significantly influence fan perceptions and sports identification. In contrast, there is no substantial correlation observed between attributes such as level of education achieved and the frequency of engaging in sports activities, and the aforementioned outcomes. The significant associations identified between the Fan Love-Hate Scale and the Sports Fan Identification Scale underscore the complex relationship between fans' emotional experiences and their connection to sports. Further investigations could be conducted to go deeper into the underlying causes that contribute to these relationships and inequalities, so resulting in a more thorough understanding of fan psychology. [ABSTRACT FROM AUTHOR]

The present paper describes the principle and characteristics of a biosensor for lactose based on a third-generation design involving cellobiose dehydrogenase. As resulted from a previous comparative study (submitted manuscript), the novelty of this lactose biosensor is based on highly efficient direct electron transfer between two newly discovered cellobiose dehydrogenases (CDH), from the white rot fungi Trametes villosa and Phanerochaete sordida, and a solid spectrographic graphite electrode. CDH was immobilized on the electrode surface (0.073 [cm.sup.2]) by simple physical adsorption, and the CDH-modified electrode was next inserted into a wall-jet amperometric cell connected on-line to a flow injection setup (0.5 mL*[min.sup.-1]). The P. sordida CDH-based lactose biosensor, proved to be the better one, has a detection limit for lactose of 1 [micro]M, a sensitivity of 1100 [micro]A* [mM.sup.-1]*[cm.sup.-2], a response time of 4 s (the time required to obtain the maximum peak current), and a linear range from i to 100 [micro]M lactose (correlation coefficient 0.998). The simplicity of construction and analytical characteristics make this CDH-based lactose biosensor an excellent alternative to previous lactose biosensors reported in the literature or commercially available. The CDH-lactose sensor was used to quantify the content of lactose in pasteurized milk, buttermilk, and low-lactose milk, using the standard addition method. No effects of the samples matrixes were observed. The operational stability of the sensor was tested for 11 h by continuous injection of 100 [micro]M lactose (290 injections). The final signal of the sensor was maintained at 98% of its initial signal, with a low standard deviation of 1.72 (RSD 2.41%).

A cellobiose dehydrogenase (CDH)-modified graphite electrode was designed for amperometric detection of catecholamines in the flow injection mode, by their recycling between the graphite electrode (+300 mV vs Ag|AgCl) and the reduced FAD cofactor of adsorbed CDH, resulting in an amplified response signal. The high efficiency of the enzyme-catecholamine reaction leads to a detection limit below 1 nM and a sensitivity of 15.8 A x [M.sup.-1] x [cm.sup.2] (~1150 nA/[micro]M) for noradrenaline, with a coverage of less than 2.5 [micro]g of CDH adsorbed on the electrode surface (0.073 [cm.sup.2]). Working parameters such as pH, cellobiose concentration, carrier buffer, and applied potential were optimized, using hydroquinone as a model analyte. The sensitivity, linear range, and amplification factor can be modulated by the steady-state concentration of cellobiose in the flow buffer. The response of the sensor decreases only 2% when run continuously for 4 h in the flow injection mode. The response peak maximum is obtained within 6 s at a flow rate of 0.5 mL/ min, representing the time of the entire sample segment to pass the electrode. CDH enzymes from Phaneroehaete chrysosporium and Sclerotium rolfsii were investigated, providing different characteristics of the sensor, with sensors made with CDH from P. chrysosporium being the better ones.

The research has followed the way to improve the motor qualities by applying the specific means of the sports game (handball) to the designated learning units. In the present paper, there are displayed the results regarding the strength and resistance skills. The experiment took place during the 2017-2018 school years. There were involved 79 students from the seventh grade from two different schools in the rural environment. The process of preparing the specific means for developing the strength and resistance skills was replaced by the process of preparing the specific means for the handball game. There were 10 exercises selected containing elements from the handball game for each motor skill (strength /resistance) For the strength motor skill were assigned sixteen lessons (six lessons on the first semester and ten lessons on the second semester) and for the resistance skill were assigned 10 lessons only for the second semester. For resistance were used 3exerciţii during one lesson which were replayed during the lesson from the same week. The allocated time was 3 to 5 minutes for each exercise. For strength were used two means during the lesson, the allocated time being of 5 to 7 minutes. For the evaluation were used four trials taken from the National System of Evaluation. The data were registered and processed through the statistics application SPSS 23.0. The results showed significant progress, after applying the selected exercises, for experimental groups. [ABSTRACT FROM AUTHOR]