Perceptions of Football Analysts Goal-Scoring Opportunity Predictions: A Qualitative Case Study.

This study aimed to understand the way tactical football analysts perceive the general match analysis issues and to analyze their tactical interpretation of the predictive models of conceded goal-scoring opportunities. Nine tactical analysts responded to the semi-structured interviews that included a general section on the match analysis and a specific one on the results of a study on goal-scoring opportunities conceded by a Spanish La Liga team. Following their transcription, the interviews were codified into categories by the two researchers using Atlas Ti® software. Subsequently, frequency count and co-occurrence analysis were performed based on the encodings. The content analysis reflected that analysts play a crucial role in the analysis of their own team and that of the opponent, the essential skills to exercise as a tactical analyst being "understanding of the game" and "clear observation methodology." Based on the case study of the conceded goal-scoring opportunities, the major causes and/or solutions attributed by analysts in some of the predictive models were the adaptability of the "style of play" itself according to the "opponent" and "pressure after losing."

Relationship between Physical Fitness and Match Performance Parameters of Chile Women's National Football Team.

The aim of this study was to analyze the relationships between the level of physical fitness and the physical performance parameters recorded by GPS in official FIFA matches of the Chilean women's senior national football team in the period 2018-2020. Twenty-six female field players (age (mean ± SD) 26.8 ± 3.3 years, height 157.8 ± 21.5 cm, weight 58.9 ± 4.9 kg) participated in the study. Physical fitness variables were assessed: muscular strength, countermovement jump (CMJ), speed, agility and aerobic fitness. Physical performance variables were recorded by GPS in 26 official FIFA matches. The most notable associations with significant statistical significance (p < 0.001) were those observed between neuromuscular variables such as time to run 10 m (T10; r = -0.629) and jump (CMJ; r = 0.502) and the number of accelerations; aerobic fitness showed a highly significant relationship with meters run per minute (M/M; r = 0.589). The findings of this study provide evidence of how the level of physical fitness (neuromuscular and aerobic) relates to physical performance parameters recorded in official competitions.

Systematic Review of Self-Assessment in Physical Education.

Self-assessment is among the most impactful processes in student learning. Since no review of this process was found in the field of physical education (PE), the objective of this work was to perform a systematic review of the literature published over the last five years on the self-assessment of PE students in formal education contexts. The review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) standards. Inclusion and exclusion criteria were established to select the articles. A total of three researchers independently applied the above criteria and obtained a total of thirteen studies. After synthesising the results by category, we found that: a majority of the studies were conducted in Europe; all 13 studies covered the educational stages of either secondary or higher education; an even number of qualitative and quantitative approaches were distributed among the studies; some studies focused on specific sports or contents, while others were applicable to any subject; and, finally, depending on the research design adopted, the results described self-assessment strategy processes, improvements in learning, drew descriptive portraits of students regarding health, or reflected students' positive perceptions of self-assessment. It is necessary to conduct further studies on PE students' self-assessment, especially in primary education.

Erratum: Rodríguez-Medellín, R., et al. Mexican Validation of the Engagement and Disaffection in Physical Education Scale. Int. J. Environ. Res. Public Health 2020, 17, 1821.

The authors wish to add the following correction to their paper published in International Journal of Environmental Research and Public Health [...].

Mexican Basic Psychological Need Satisfaction and Frustration Scale in Physical Education.

Basic psychological needs are an energizing state that, if satisfied, will produce an increase in confidence and a healthy motivational orientation that leads to wellness. Frustration of these needs is the opposite concept of satisfaction, which refers to the negative sensation experimented by an individual when he or she perceives that their psychological needs are being actively limited by the actions of the significant other. To date, we have not found instruments validated in Spanish that measure both the satisfaction and the frustration of basic psychological needs in the physical education (PE) context. Therefore, the aims of this study are adapting the Basic Psychological Need Satisfaction and Frustration Scale (BPNSFS) to the PE context in Mexico; and examine its psychometric properties, structure, and factorial invariance by gender in a sample of fifth- and sixth-grade elementary school students. This study included a total of 1,470 fifth- and sixth-grade students from elementary schools in the metropolitan area of Monterrey, Nuevo Leon, Mexico. The results support the reliability, validity, structure, and strict invariance of the sixth Mexican version of the BPNSFS in physical education (BPNSFS-PE). The BPNSFS-PE can be used to measure the satisfaction and/or frustration of the basic psychological needs of students in PE class and to perform comparisons between groups of boys and girls.

Mexican Validation of the Engagement and Disaffection in Physical Education Scale.

To date, no instrument adapted and validated that measures engagement and disaffection in the physical education class has been found, which limits the generation of knowledge of this area in Mexico. The aims of this study were to translate and adapt the engagement and disaffection scale to the context of physical education in Mexico and to examine its reliability, structure (two and four factors), and factorial invariance by gender in Mexican fifth- and sixth-grade elementary school students. A total of 1470 students participated (50.6% boys) with ages between 10 and 14 years (mean (M) = 10.56; standard deviation (SD) = 0.77) from federal (89.3%) and state (10.7%) elementary schools. Two factorial structures were tested (with four factors and two factors). The fit indexes of both models were satisfactory, and the factorial saturations were significant. The differences between the fit indexes of both models were irrelevant; therefore, the two-factor model was considered more suitable. The total strict invariance by gender was confirmed, and the reliabilities of the engagement and disaffection scale were acceptable. The Mexican version of the course engagement and disaffection scale in physical education is valid and useful to measure these constructs in the context of physical education in Mexico.

Effects of fatigue induced by repeated-sprint on kicking accuracy and velocity in female soccer players.

The aim of this study was to investigate the effects of fatigue induced by repeated sprint in the kicking accuracy and velocity in female soccer players. Eighteen Under-23 female soccer players from a Spanish professional club were subjected to a fatigue protocol based on a repeated-sprint ability (RSA) test. Measurements of the kicking velocity (maximal ball velocity) and accuracy (Loughborough Soccer Shooting Test) were taken before and after fatigue induction. Correlations between the change in the maximal ball velocity/accuracy and the heart rate (HR), the fatigue index (FI), the sprint decrement (Sdec) and the rating of perceived exertion (RPE) were made. There was a significant difference between maximal ball velocity under fatigue conditions with respect to non-fatigue conditions (p = 0.001; ES = 0.89). However, despite a lower kicking accuracy punctuation with fatigue, this was not statistically significant (p = 0.433; ES = 0.22). Significant correlations were found between the maximal kicking velocity and the FI (r = 0.632, p < 0.01) and the Sdec (r = -0.554, p < 0.05) and between the kicking accuracy and the RPE (r = -0.506, p < 0.05). In conclusion, there was a significant reduction in the maximal kicking velocity, but not in the kicking accuracy, under fatigued conditions. The RSA-related FI and Sdec were the best predictors of the maximal kicking velocity and the RPE for the kicking accuracy.

Relationships between fitness test and kicking velocity in young soccer players.

BACKGROUND: To study the relation between fitness test and kicking velocity in young soccer players, which has not been previously studied in this group of age. METHODS: Ninety-eight Under-11 soccer players who belonged to two professional Spanish clubs and two amateur clubs were subjected to sprint test (15 and 30 meters), countermovement jump (CMJ), estimation of maximal oxygen intake (VO2max), kicking velocity test, fatigue index of jump height and anthropometrical measures. RESULTS: Kicking velocity was significantly correlated (P<0.05) with 15-m sprint (r=-0.554) and 30-m sprint (r=-0.587), CMJ height (r=0.479), VO2max (r=0.475), body mass (r=0.311) and height (r=0.529), but not with Body Mass Index (BMI) (r=-0.011) and Fatigue Index of jump height (r=-0.05). CONCLUSIONS: This study provides new data about correlations between kicking velocity and fitness test, establishing greater correlations between kicking velocity and other variables compared to other groups of age previously studied, suggesting high transferences between results in fitness test and kicking velocity.

Effects of Muscle Fatigue Induced by Countermovement Jumps on Efficacy Parameters of Instep Ball Kicking in Soccer.

The purpose was to study the effects of muscle fatigue induced by countermovement jumps (CMJ) on instep kick foot velocity in young male soccer players. Fifteen under-18 soccer players from a professional club performed maximal velocity instep kicks before and after a fatigue protocol that consisted of continuous CMJ. Foot velocity at impact without fatigue, foot velocity at impact with fatigue, CMJ height without fatigue, maximum jump height in fatigue test, and CMJ height change in fatigue test on a dynamometric platform were measured. There was a significant difference between jump height with and without fatigue (P = .00; ES = 0.8), but there were no significant differences between kicking with fatigue and without fatigue (P = .580, ES = 0.10). In conclusion, although the protocol was intense enough to generate fatigue in the muscles involved in CMJ, there were no significant differences in kicking velocity under fatigue conditions with respect to kicking without fatigue in the soccer players studied.

[Analysis of adiposity and physical fitness in young Colombian students].

INTRODUCTION: Body mass index and physical fitness are important markers of a healthy life style. Objective: To analyze adiposity and physical fitness in young students from public schools in Armenia, Colombia, and examine differences between sex and age groups. Materials and methods: We analyzed 1,150 students: 46.6% (n=536) males and 53.4% (n=614) females, with an age range of 10 to 20 years (15.45 ± 2.52). Physical fitness was evaluated by the Course-Navette test, the Horizontal Jump test, the 20-meter run test and the Sit-and-Reach test. Body mass index and body fat were also assessed. Results: Compared with males, females had significantly higher adiposity levels, body mass index (20.4 vs. 19.5) and body fat (23% vs. 11%). Males had higher levels of physical fitness in all the variables analyzed, with statistically significant differences (p<0.001), except in flexibility, where females achieved better results (3.1cm vs.1 3cm; p=0.003). In both sexes, body mass index increased with age (p<0.001). However, body fat decreased with age in males (p<0.001) and increased in females (p<0.001). In males, physical fitness improved with age in all variables. In females, no significant differences were found between age groups except in the maximal oxygen uptake (VO2max, p<0.001). Conclusion: Adiposity was significantly higher in women than in men. Males had a better level of physical fitness than females, except in flexibility. Physical fitness improved significantly with age in males, but did not change in females.

Análisis de la adiposidad y la condición física en escolares colombianos / Analysis of adiposity and physical fitness in young Colombian students

Introducción. El índice de masa corporal y la condición física son indicadores de un estilo de vida saludable. Objetivo. Analizar el grado de adiposidad y la condición física en estudiantes de instituciones educativas públicas de Armenia, Colombia, y estudiar las diferencias por sexo y edad. Materiales y métodos. Participaron 1.150 estudiantes, de los cuales 46,6 % eran de sexo masculino (n=536) y 53,4 % (n=614) de sexo femenino; el rango de edad fue de 10 a 20 años (15,45 ± 2,52). Las pruebas de condición física usadas fueron el test de Course-Navette, el de salto horizontal, el de la carrera de 20 m y el de Wills y Dillon. También, se evaluaron el índice de masa corporal y el porcentaje de grasa. Resultados. En comparación con los hombres, las mujeres tenían mayor adiposidad, índice de masa corporal (20,4 Vs . 19,5) y porcentaje de grasa (23 Vs . 11 %). En cuanto a la condición física, los hombres registraron un mejor rendimiento en todas las variables estudiadas, con diferencias significativas (p<0,001), excepto en la flexibilidad, en la que las mujeres alcanzaron mejores resultados (3,1 Vs . 1,3 cm; p=0,003). En ambos sexos, el índice de masa corporal aumentó con la edad (p<0,001); en los hombres, el porcentaje de grasa disminuyó con la edad (p<0,0001) y en las mujeres aumentó (p<0,001). La condición física de los hombres mejoró con la edad en todas las variables, mientras que en las mujeres no hubo diferencias significativas entre los grupos de edad, salvo en el consumo máximo de oxígeno (VO 2máx ) (p<0,001). Conclusión. La adiposidad fue significativamente mayor en las mujeres que en los hombres. Los hombres tuvieron una mejor condición física en todas las variables, excepto en la flexibilidad. En los hombres la condición física mejoró significativamente con la edad, en tanto que en las mujeres no cambió.

Introduction: Body mass index and physical fitness are important markers of a healthy life style. Objective: To analyze adiposity and physical fitness in young students from public schools in Armenia, Colombia, and examine differences between sex and age groups. Materials and methods: We analyzed 1,150 students: 46.6% (n=536) males and 53.4% (n=614) females, with an age range of 10 to 20 years (15.45 ± 2.52). Physical fitness was evaluated by the Course-Navette test, the Horizontal Jump test, the 20-meter run test and the Sit-and-Reach test. Body mass index and body fat were also assessed. Results: Compared with males, females had significantly higher adiposity levels, body mass index (20.4 vs. 19.5) and body fat (23% vs. 11%). Males had higher levels of physical fitness in all the variables analyzed, with statistically significant differences (p<0.001), except in flexibility, where females achieved better results (3.1cm vs.1 3cm; p=0.003). In both sexes, body mass index increased with age (p<0.001). However, body fat decreased with age in males (p<0.001) and increased in females (p<0.001). In males, physical fitness improved with age in all variables. In females, no significant differences were found between age groups except in the maximal oxygen uptake (VO 2max , p<0.001). Conclusion: Adiposity was significantly higher in women than in men. Males had a better level of physical fitness than females, except in flexibility. Physical fitness improved significantly with age in males, but did not change in females.