RESUMO

The aim of this systematic review was to assess the effects of plyometric-jump training (PJT) on the physical fitness of youth with cerebral palsy (CP) compared with controls (i.e., standard therapy). The PRISMA 2020 guidelines were followed. Eligibility was assessed using the PICOS approach. Literature searches were conducted using the PubMed, Web of Science, and SCOPUS databases. Methodological study quality was assessed using the PEDro scale. Data were meta-analyzed by applying a random-effects model to calculate Hedges' g effect sizes (ES), along with 95% confidence intervals (95% CI). The impact of heterogeneity was assessed (I2 statistic), and the certainty of evidence was determined using the GRADE approach. Eight randomized-controlled studies with low-to-moderate methodological quality were included, involving male (n = 225) and female (n = 138) youth aged 9.5 to 14.6 years. PJT interventions lasted between 8 and 12 weeks with 2-4 weekly sessions. Compared with controls, PJT improved the muscle strength (ES = 0.66 [moderate], 95% CI = 0.36-0.96, p < 0.001, I2 = 5.4%), static (ES = 0.69 [moderate], 95% CI= 0.33-1.04, p < 0.001, I2 = 0.0%) and dynamic balance (ES = 0.85 [moderate], 95% CI = 0.12-1.58, p = 0.023, I2 = 81.6%) of youth with CP. Therefore, PJT improves muscle strength and static and dynamic balance in youth with CP compared with controls. However, more high-quality randomized-controlled trials with larger sample sizes are needed to provide a more definitive recommendation regarding the use and safety of PJT to improve measures of physical fitness.

RESUMO

Objetivo: Identificar a prevalência de síndrome de burnout e comparar a percepção da síndrome pré e pós-temporada em atletas sub-20 de futebol de campo. Metodologia: Participaram do estudo 48 atletas do sexo masculino de 5 clubes profissionais, com média de idade de 18,5 ± 0,7 anos. Para a coleta de dados utilizou-se uma ficha sociodemográfica e o Questionário de Burnout para Atletas (QBA). Para as médias das dimensões e burnout total foi utilizada a estatística descritiva. A normalidade dos dados foi considerada não-paramétrica por meio do teste de Shapiro-Wilk. Em seguida foi utilizado o teste de Wilcoxon para avaliar possíveis diferenças de sentimentos de burnout pré e pós-temporada. O nível de significância adotado foi p< 0,05. O tamanho de efeito foi medido pelo teste d de Cohen. Resultados e Discussão: Não foram encontradas diferenças significativas nas variações de sentimentos de burnout total e por dimensões antes e após a temporada (p>0,05) e o tamanho de efeito das comparações foi considerado pequeno (Cohen d < 0, 30). Conclusão: Os atletas apresentaram baixa prevalência de síndrome de burnout, tanto no início quanto no final da temporada. Quanto à percepção das dimensões de burnout, os atletas não apresentaram altos níveis, o que pode sinalizar que os atletas conseguem lidar de maneira adaptativa com as demandas tanto no âmbito esportivo como pessoal

Objective: To identify the prevalence of burnout syndrome and compare the perception of the syndrome before and after the season in under-20 field soccer athletes. Methodology: The study involved 48 male athletes from 5 professional clubs, with an average age of 18.46 ± 0.69 years. Data collection included a sociodemographic form and the Athlete Burnout Questionnaire (ABQ). Descriptive statistics were used for means of dimensions and total burnout. Data normality was considered non-parametric using the Shapiro-Wilk test. Subsequently, the Wilcoxon test was employed to assess potential differences in burnout feelings before and after the season. The adopted significance level was p < 0.05. Effect size was measured by Cohen's d test. Results and discussion: No significant differences were found in variations of total burnout feelings and by dimensions before and after the season (p > 0.05), and the effect size of the comparisons was considered small (Cohen d < 0.30). Conclusion: Athletes displayed a low prevalence of burnout syndrome, both at the beginning and end of the season. Regarding the perception of burnout dimensions, athletes did not exhibit high levels, which may indicate that athletes can adaptively cope with demands in both the sports and personal spheres.

Objetivo: Identificar la prevalencia del síndrome de burnout y comparar la percepción del síndrome antes y después de la temporada en deportistas de fútbol sub-20. Metodología: Participaron en el estudio 48 atletas masculinos de 5 clubes profesionales, con una edad promedio de 18.46 ± 0.69 años. Para la recopilación de datos, se utilizó un cuestionario sociodemográfico y el Questionário de Burnout para Atletas (QBA). Para las medias de las dimensiones y el burnout total se utilizó la estadística descriptiva. La normalidad de los datos se consideró no paramétrica a través de la prueba de Shapiro-Wilk. Luego se utilizó la prueba de Wilcoxon para evaluar posibles diferencias en los sentimientos de burnout antes y después de la temporada. El nivel de significancia adoptado fue p < 0,05. El tamaño del efecto se midió mediante la prueba d de Cohen. Resultados y discusión: No se encontraron diferencias significativas en las variaciones de los sentimientos de burnout total y por dimensiones antes y después de la temporada (p > 0,05), y el tamaño del efecto de las comparaciones se consideró pequeño (Cohen d < 0,30). Conclusión: Los deportistas mostraron una baja prevalencia del síndrome de burnout, tanto al comienzo como al final de la temporada. En cuanto a la percepción de las dimensiones de burnout, los deportistas no presentaron niveles altos, lo que podría indicar que los deportistas pueden enfrentar de manera adaptativa las demandas tanto en el ámbito deportivo como en el personal.

Assuntos

RESUMO

El conocimiento nutricional es clave para la formación de hábitos alimentarios y en la modulación del comportamiento alimentario. La alimentación y nutrición son cruciales durante la adolescencia sobre todo en jóvenes deportistas. El objetivo de esta investigación fue analizar la validez teórica y los índices de discriminación y dificultad del cuestionario de conocimientos nutricionales aplicados en el deporte utilizando la teoría de respuesta al ítem en deportistas juveniles de 14 a 19 años. Este estudio instrumental se desarrolló en cinco fases: generación de ítems, revisión por panel de expertos, pilotaje, aplicación y depuración final. Participaron 261 adolescentes de 14 a 19 años e integrantes de disciplinas colectivas en selecciones Nacional y clubes profesionales. Se determinaron los índices de dificultad y de discriminación para cada uno de los ítems. Los ítems 1 (0,354) y 2 (0,285) del factor antes, 3 (0,315) y 6 (0,408) del factor durante, 7 (0,354) y 10 (0,408) del factor después, 3 (0,254) y 9 (0,231) del factor hidratación y, 2 (0,362) y 5 (0,323) del factor suplementación, fueron los que presentaron mayor grado de discriminación. El cuestionario de conocimientos nutricionales aplicados en el deporte está compuesto por 30 ítems divididos en cinco factores cada uno de ellos con seis ítems. La propuesta inicial del cuestionario es una herramienta valida teóricamente y con índices de dificultad y discriminación adecuados para evaluar el conocimiento nutricional en jóvenes deportistas. Su aplicación permite conocer potenciales brechas en conocimientos claves y diseñar estrategias educativas específicas para subsanarlas.

Nutritional knowledge plays a fundamental role in the formation of dietary habits and the modulation of eating behaviour. Nutrition and diet are crucial during adolescence, especially for young athletes. The purpose of this research was to analyse the theoretical validity and indices of discrimination and difficulty of the questionnaire on nutritional knowledge applied in sports using item response theory in youth athletes aged 14 to 19. This instrumental study was conducted in five phases: item generation, expert panel review, pilot testing, application, and final refinement. A total of 261 adolescents aged 14 to 19, who were members of national team and collective disciplines of professional clubs, participated. Difficulty and discrimination indices were determined for each item. Items 1 (0.354) and 2 (0.285) of the before factor, 3 (0.315) and 6 (0.408) of the during factor, 7 (0.354) and 10 (0.408) of the post factor, 3 (0.254) and 9 (0.231) of the hydration factor, and 2 (0.362) and 5 (0.323) of the supplementation factor showed the highest degree of discrimination. The questionnaire on nutritional knowledge applied in sports consists of 30 items divided into five factors, each with six items. The initial questionnaire proposal is a theoretically valid tool and with adequate difficulty and discrimination indices to evaluate nutritional knowledge in young athletes. Its application allows for identifying potential gaps in key knowledge and designing specific educational strategies to address them.

RESUMO

We aimed to examine the acute effect of mental fatigue on young basketball players' three-dimensional multiple object tracking (3D-MOT) skills. Our participants were 12 adolescent basketball players (M age = 16.66, SD = 1.87 years; M years of practice = 2.66, SD = 1.07 years). In nine lab visits, we used visits 1 to 7 to familiarize participants with 3D-MOT, a subjective scale of mental fatigue, and a Stroop task involving mental set shifting. In the last two visits, participants performed in both experimental (EXP) and control (CON) conditions that were presented in randomized order. In the EXP condition, participants performed 3D-MOT pre- and post-60 minutes of induced mental fatigue; in the CON condition, they watched a documentary. After each condition, B participants performed the National Aeronautics and Space Administration Task Load Index (NASA-TLX). 3D-MOT performance measures were the "score" and "fastest trial score success." The response time on the Stroop tasks increased throughout the mental fatigue inducement in the experimental condition (p = .0037). The NASA-TLX responses were higher following the EXP condition than following the CON condition for mental demand, temporal demand, and performance (all ps < .05). Still, there were no significant EXP versus CON differences on the 3D-MOT performance indicators.

Assuntos

RESUMO

BACKGROUND: Among youth, plyometric-jump training (PJT) may provide a safe, accessible, and time-efficient training method. Less is known on PJT effectiveness according to the maturity status. OBJECTIVE: This systematic review with meta-analysis set out to analyse the body of peer-reviewed articles assessing the effects of PJT on measures of physical fitness [i.e., maximal dynamic strength; change of direction (COD) speed; linear sprint speed; horizontal and vertical jump performance; reactive strength index] and sport-specific performance (i.e., soccer ball kicking and dribbling velocity) according to the participants' maturity status. METHODS: Systematic searches were conducted in three electronic databases using the following inclusion criteria: (i) Population: healthy participants aged < 18 years; (ii) Intervention: PJT program including unilateral and/or bilateral jumps; (iii) Comparator: groups of different maturity status with control groups; (iv) Outcomes: at least one measure of physical fitness and/or sport-specific performance before and after PJT; (v) experimental design with an active or passive control group, and two or more maturity groups exposed to the same PJT. The DerSimonian and Laird random-effects models were used to compute the meta-analysis. The methodological quality of the studies was assessed using the PEDro checklist. GRADE was applied to assess certainty of evidence. RESULTS: From 11,028 initially identified studies across three electronic databases, 11 studies were finally eligible to be meta-analysed (n total = 744; seven studies recruited males; four studies recruited females). Three studies were rated as high quality (6 points), and eight studies were of moderate quality (5 points). Seven studies reported the maturity status using age at peak height velocity (PHV; pre-PHV values up to - 2.3; post-PHV up to 2.5). Another four studies used Tanner staging (from Tanner I to V). The training programmes ranged from 4 to 36 weeks, using 1-3 weekly training sessions. When compared to controls, pre-PHV and post-PHV participants obtained small-to-moderate improvements (ES = 0.35 - 0.80, all p < 0.05) in most outcomes (i.e., sport-specific performance; maximal dynamic strength; linear sprint; horizontal jump; reactive strength index) after PJT. The contrast of pre-PHV with post-PHV youth revealed that PJT was similarly effective in both maturity groups, in most outcome measures except for COD speed (in favour of pre-PHV). PJT induces similar physical fitness and sport-specific performance benefits in males and females, with a minimal exercise dosage of 4 weeks (8 intervention sessions), and 92 weekly jumps. Results of this meta-analysis are based on low study heterogeneity, and low to very low certainty of evidence (GRADE analysis) for all outcomes. CONCLUSION: Compared to control participants, PJT resulted in improved maximal dynamic strength, linear sprint speed, horizontal jump performance, reactive strength index, and sport-specific performance (i.e., soccer ball kicking and dribbling velocity). These effects seem to occur independently of the maturity status, as both pre-PHV and post-PHV participants achieved similar improvements after PJT interventions for most outcomes. However, several methodological issues (e.g., low sample sizes and the pooling of maturity categories) preclude the attainment of more robust recommendations at the current time. To address this issue, consistency in maturity status reporting strategies must be improved in future studies with the general youth population and youth athletes.

RESUMO

The present longitudinal meta-analysis aimed to estimate the growth curves and age at peak height velocity (PHV) in young male athletes, considering anthropometric data from available longitudinal studies. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, studies with repeated measurements in young male athletes were identified from searches across four databases (MEDLINE, SPORTDiscus, Web of Science, and SCOPUS). Estimations were based on multilevel polynomial models using a fully Bayesian framework. After a full-text screening of 317 studies meeting the eligibility criteria, 31 studies were considered. Studies were excluded mainly due to study design, repeated reporting, and incomplete reporting of the outcomes. Of the 31 studies analysed, 26 (84%) focused on young European athletes. The average age at PHV for the total sample of studies with young athletes was 13.1 years (90% credible interval: 12.9; 13.4). When considering data by sport, there was substantial variation in the age at PHV estimates (range: 12.4 to 13.5 years). As most studies in the meta-analysis focused on young European football players (52%), predictions for young athletes from other sports may be limited. The age at PHV in the available data occurred earlier than in general paediatric populations.

Assuntos

RESUMO

To investigate the presence of burnout syndrome in child athlete tryouts for the Brazilian Handball Team, before and after the National Development and Technical Improvement Camp is of great interest. A correlational study, with longitudinal design of the before-and-after type, carried out with 64 male athletes in the children's category, immersed in the National Camp for Development and Improvement of Handball Technique, in the municipality of São Bernardo do Campo, São Paulo, Brazil, in December 2018. To evaluate burnout syndrome, we used the Athlete Burnout Questionnaire (ABQ). There was a statistically significant increase of the mean scores for burnout and dimensions (Physical and Emotional Exhaustion = 1.5 to 1.6; p-value < 0.001; Reduced Sense of Accomplishment = 2.7 to 2.9; p-value < 0.001; Sports Devaluation = 1.4 to 1.6; p-value < 0.001; and General Burnout = 1.9 to 2.0; p-value < 0.001). The athletes selected for the national team had lower mean scores for general burnout and dimensions (Physical and Emotional Exhaustion = 1.5; Reduced Sense of Accomplishment = 2.7; Sports Devaluation = 1.5; General Burnout = 1.9). The National Camp for Development and Technical Improvement can have a negative impact on the mental health of athletes. This event is important to select the competitors with greater ability to face the pressure and adversities present in the sport environment.

Assuntos

RESUMO

Maximum isometric handgrip strength (MIHS) is a relevant parameter for judo performance and is related to health. Understanding the association between MIHS and MIHS relative (MIHSrel) and the absolute lean mass of the arm (LMarm) and the percentage of body fat (%BF) can provide important information for performance and health. The study aimed to investigate the correlation between MIHS and MIHSrel with the LMarm and the %BF of young judokas (sub-19, 15 males and 14 females). MIHS was measured using a multipurpose digital dynamometer with a load cell for computer. Body composition was measured by dual-energy X-ray absorptiometry (DXA). The correlation between MIHS, MIHSrel with LMarm and %BF was verified through Pearson's correlation, with a significance level of p < 0.05. Correlation between MIHSrel and %BF was very high only in female judokas for both arms (right, r = -0.76; left, r = -0.75). Correlations between LMarm and MIHS of the right and left arms ranged from very high to almost perfect for both sexes (r = 0.74 to 0.94). These results highlight the importance of strengthening the arms in young judokas, and controlling body fat for performance and health, especially in female judokas.

Assuntos

RESUMO

A pesquisa qualitativa em pedagogia do esporte conquistou reconhecimento acadêmico, mas ainda pairam dúvidas sobre sua aleatoriedade, subjetividade e falta de rigor com base na ética do/a pesquisador/a. Defendemos, apoiado em reflexões filosóficas, posição favorável à busca por rigorosidade metodológica na pesquisa qualitativa, porém, nossa posição não se baseia na cisão, mas no diálogo possível entre as premissas positivistas que sustentam a busca por rigorosidade e a possibilidade de pleno envolvimento do/a pesquisador/a com o campo de pesquisa. Diante deste contexto, apresentamos os nossos esforços na condução de um estudo de pós-graduação sobre competições de jovens, apresentando os caminhos metodológicos percorridos em busca de validação e confiabilidade dos procedimentos de coleta de informações e tratamento analítico aos dados qualitativos.

Qualitative research in sport pedagogy has conquered academic recognition, but doubts about its randomness, subjectivity and lack of rigor based on researcher ethics. We defend, based on philosophical reflections, a position favorable to the adoption of criteria of methodological rigor for qualitative research, however, our position is not based on a split, but on the possible dialogue between the positivist premises that support the search for rigor and the possibility of full involviment of the researcher with de research field. Thus, we present our efforts in conducting a postgraduate study on youth competitions, presenting the methodological paths traveled in search of validation and reliability for data collection procedures and analytical treatment of qualitative data.

La investigación cualitativa en pedagogía del deporte ha conquistado reconocimiento académico, pero aún quedan dudas sobre su aleatoriedad, subjetividad y falta de rigor a partir de la ética del investigador. Defendemos, con base en reflexiones filosóficas, una posición favorable a la adopción de criterios de rigor metodológico para la investigación cualitativa, sin embargo, nuestra posición no se basa en una escisión, sino en el diálogo posible entre las premisas positivistas que sustentan la búsqueda de rigor y la posibilidad de total involucramiento del investigador com el campo de investigación. Así, presentamos nuestros esfuerzos en la realización de un estudio de posgrado sobre competiciones juveniles, presentando los caminos metodológicos recorridos en busca de la validación y confiabilidad para los procedimientos de recolección de informaciónes y tratamiento analítico a los datos cualitativos.

RESUMO

Abstract Background: Children and adolescents should be encouraged to participate in sports; however, physicians should screen for cardiac abnormalities that can lead to sudden death. The European Society of Cardiology, the Brazilian Society of Cardiology and the Brazilian Society of Sports Medicine indicate performing an electrocardiogram (ECG) in evaluating athletes, while the American Heart Association indicates complementary exams only when there is a personal or family history of cardiovascular diseases or changes in clinical examination. Objectives: To evaluate the need for an ECG in evaluating children and adolescents before starting physical activities. Methods: We recruited 983 children and adolescents who practiced physical activities for anthropometric assessment, clinical examination and conventional ECG at rest. Variables were analysed using the Goodman test with a significance level of 5%. Results: Participants had a higher incidence of overweight, obesity and severe obesity compared to standard World Health Organization (WHO) values. The most common finding in clinical examination was heart murmur (18.5% of participants). Electrocardiographic changes were found in 3.3% of participants, including paroxysmal supraventricular tachycardia and pre-excitation syndrome, which may be responsible for sudden death, even in asymptomatic individuals with no personal or family history of heart disease and no abnormality on clinical examination. Conclusions: ECG revealed arrhythmias that were not detected by clinical examination and may precede sudden death in individuals subjected to physical exertion, indicating its role in the assessment of children and adolescents before starting regular physical exercise.

RESUMO

ABSTRACT Training monitoring is important in the development process of the athlete. The objective of the study was to characterize the psychophysiological response and physical demands of soccer, basketball, handball, and volleyball with young athletes. The sample consisted of 61 young athletes of both genders and members of team sports, 10 training sessions for each modality were monitored. The psychophysiological responses were monitored by the session rating perception of exertion (Session RPE) and training impulse (TRIMP). The physical demands were, distance covered (DC), DC by speed zone (DC_Z1, DC_Z2, DC_Z3, DC_Z4, DC_Z5), number of sprints, and duration of the session. In addition, the recovery status (TQR) was also collected. Differences were noted between duration (p<0.001), DC_Z1 (p<0.017), DC_Z2 (p<0.05), DC_Z3 (p<0.05), DC_Z4 (p<0.003), DC_Z5 (p < 0.05), sprints (p < 0.001), TRIMP (p<0.02), Session RPE (p<0.05) and TQR (p<0.007). In psychophysiological responses, handball showed more time in zones 4 and 5 than other modalities. According to physical demands, basketball, and handball had a higher number of sprints and also higher values ​​in DP_Z5. Therefore, the simultaneous monitoring of physical demands and psychophysiological responses provides supplementary information in monitoring young athletes.

RESUMO O monitoramento do treinamento é importante no processo de desenvolvimento dos atletas. O objetivo do estudo foi comparar as respostas psicofisiológicas e as demandas físicas de jovens atletas de futebol, basquete, handebol e voleibol. A amostra foi constituída por 61 indivíduos de ambos os gêneros que foram acompanhados ao longo de 10 sessões de treino de cada modalidade em questão. As respostas psicofisiológicas foram monitoradas através da percepção subjetiva de esforço da sessão (PSE da sessão) e o impulso de treinamento (TRIMP). As demandas físicas analisadas foram a distância total percorrida (DP), DP por zona de velocidade (DP_Z1, DP_Z2, DP_Z3, DP_Z4, DP_Z5), número de sprints e a duração das sessões. Além disso, o estado de recuperação (TQR) também foi analisado. Foram observadas diferenças significativas entre a duração das sessões (p<0,001), DP_Z1 (p<0,017), DP_Z2 (p<0,05), DP_Z3 (p<0,05), DP_Z4 (p<0,003), DP_Z5 (p <0,05), número de sprints (p < 0,001), TRIMP (p<0,02), PSE da sessão (p<0,05) e TQR (p<0,007). Nas respostas psicofisiológicas, o handebol apresentou mais tempo nas zonas 4 e 5 em comparação demais modalidades. Nas demandas físicas, o basquete e o handebol apresentaram maior número de sprints e também maiores valores na DP_Z5. Dessa forma, o monitoramento em conjunto das demandas físicas e respostas psicofisiológicas fornecem informações complementares no monitoramento de jovens atletas.

Assuntos

RESUMO

El fútbol es un deporte complejo que implica alto riego de lesión, sin embargo, a pesar de su popularidad a nivel juvenil, los datos sobre la presencia de traumatismo en edades menores a 9 años son limitados. El objetivo de este trabajo es determinar la incidencia de lesiones deportivas en participantes del torneo de fútbol SECACUP 2022 categoría sub-9. Se realizó un estudio observacional, no experimental, transversal y exploratorio. Los parámetros de evaluación fueron: ubicación topográfica, mecanismo de lesión, diagnóstico presuntivo, momento del torneo, tipo de atención, superficie de la cancha y limitación para jugar. Se evaluaron 107 jugadores repartidos en 9 equipos, obteniendo un total de 9 lesionados durante 15 juegos. La incidencia de lesiones fue 4,18 lesiones/1000hrs de juego con un promedio de 0,6 lesiones/partido, en su mayoría contusiones en muslo. El 89% de los jugadores lesionados no presentaban una lesión previa al momento del inicio del torneo. La posición con mayor incidencia de lesiones fue el Medio-Campo con 45%. En 89% de los casos, la causa de la lesión fue el traumatismo directo. Está actividad ha llevado a mayor participación de niños, incrementando las lesiones, el conocimiento de la incidencia es importante para desarrollar medidas preventivas apropiadas para la edad(AU)

Soccer is a complex sport that involves a high risk of injury; however, despite its popularity at the youth level, data on the presence of trauma in children under 9 years of age are limited. The objective of this work is to determine the incidence of sports injuries in participants of the SECACUP 2022 soccer tournament under-9 category. An observational, nonexperimental, cross-sectional and exploratory study was made. The evaluation parameters were: topographic location, injury mechanism, presumptive diagnosis, time of the tournament, type of care, court surface and limitation to play. 107 players divided into 9 teams were evaluated, obtaining a total of 9 injured during 15 games. The incidence of injuries was 4, 18 injuries/1000 hours of play with an average of 0,6 injuries/game, mostly thigh contusions. 89% of the injured players had no previous injury at the start of the tournament. The position with the highest incidence of injuries was Midfield with 45%. In 89% of cases, the cause of the injury was direct trauma. This activity has led to a greater participation of children, increasing injuries, knowledge of the incidence is important to develop age-appropriate preventive measures(AU)

Assuntos

RESUMO

En la actualidad, el fútbol es un deporte que demanda un alto desempeño físico, por lo que conocer las características de la condición física en las distintas categorías de desarrollo se hace fundamental para conducir un óptimo proceso de entrenamiento, de modo que, el objetivo de este estudio es evaluar la condición física de futbolistas de un club profesional de Nicaragua, según la categoría de edad en las cuales se desempeñaban. El presente es un estudio de tipo descriptivo, comparativo, de la condición física de 187 futbolistas, de edades entre 13 y 31 años, distribuidos por categoría según año de nacimiento y plantel profesional. El grupo PRO presenta mayor rendimiento en comparación a las categorías U13, U15, U17 y U21 (p < 0,001) en tiempo sprint lineal 10 metros (F = 71 y TE = 0,71), 30 metros (F = 85 y TE = 0,70), velocidad de tiro (F = 171 y TE = 0,81), Tiempo en test agilidad de Illinois (F = 77 y TE = 0,72) y metros recorridos en Yo-Yo de recuperación intermitente nivel 1 (F = 121 y TE = 0,73). Se puede concluir que existe un mayor rendimiento de los aspectos físicos por parte de las categorías de mayor edad. Estos resultados pueden servir de referencia o de parámetros de comparación de rendimiento físico de jugadores jóvenes y adultos a nivel nacional de Nicaragua.

Currently, soccer is a sport that demands high physical performance, so knowing the characteristics of the physical condition of players in the different categories of development is essential for conducting an optimal training process. Thus, the objective of this study is to evaluate the physical condition of soccer players from a professional club in Nicaragua, according to the age category in which they played. This is a descriptive and comparative study of the physical condition of 187 soccer players between the ages of 13 and 31, distributed by category, according to year of birth and the professional team they were on. The PRO group presented higher performance in comparison to the U13, U15, U17, and U21 categories (p<0.001) in the 10 meters linear sprint time (F=71 and TE=0.71), 30 meters linear sprint time (F=85 and TE=0.70), shooting speed (F=171 and TE=0.81), time in Illinois agility test (F=77 and TE=0.72), and in meters ran in the Yo-Yo intermittent recovery level 1 (F=121 and TE=0.73). The study shows that there is a higher performance of the older categories in the physical aspects. These results can serve as reference or comparison parameters of the physical performance of young and adult players at a national level in Nicaragua.

Atualmente, o futebol é um esporte que exige um alto desempenho físico, portanto, conhecer as características da condição física nas diferentes categorias de desenvolvimento é essencial para conduzir um processo de treinamento ideal, portanto, o objetivo deste estudo é avaliar a condição física dos jogadores de futebol de um clube profissional na Nicarágua, de acordo com a categoria etária em que jogaram. Este é um estudo descritivo e comparativo da condição física de 187 jogadores de futebol entre 13 e 31 anos, distribuídos por categoria de acordo com o ano de nascimento e equipe profissional. O grupo PRO apresentou melhor desempenho em comparação com as categorias U13, U15, U17 e U21 (p<0,001) em tempo de sprint linear 10 metros (F=71 e TE=0.71), 30 metros (F=85 e TE=0,70), velocidade de tiro (F=171 e TE=0.81), tempo em teste de agilidade illinois (F=77 e TE=0.72) e metros corridos em Yo-Yo de nível de recuperação intermitente 1 (F=121 e TE=0.73). Pode-se concluir que há um maior desempenho dos aspectos físicos por parte das categorias mais antigas. Estes resultados podem servir como parâmetros de referência ou comparação do desempenho físico de jogadores jovens e adultos a nível nacional na Nicarágua.

Assuntos

RESUMO

El objetivo de este estudio fue comparar la aptitud física entre jóvenes futbolistas colombianos y describirlas según el pico de velocidad de crecimiento. Participaron 58 jugadores de edades comprendidas entre 13,46 y 15,31 años. Se evaluó una antropometría básica y se determinó el pico de velocidad de crecimiento PVC, también se aplicaron seis pruebas físicas relacionadas con fuerza, velocidad y agilidad. Se realizaron gráficas de dispersión de las pruebas físicas según el PVC, múltiples correlaciones entre variables y, finalmente, la población se dividió en tres grupos según el club al que pertenecen los jugadores haciendo una comparación ANOVA entre club A, club B y club C. Aparentemente, el PVC describe las pruebas de fuerza-potencia en mayor medida que las pruebas de agilidad según la apreciación de las gráficas de dispersión. En las múltiples correlaciones se evidencia una gran asociación entre el CMJ con las otras pruebas; en la comparación de clubes, el club A tuvo jugadores más altos, más pesados y con un PVC más adelantado, así mismo presentó mejor rendimiento en las pruebas, principalmente en CMJ F=13,813 P<0,01, Lanzamiento Balón Medicinal F = 11,053 P<0,01, Velocidad de Remate F = 18,916 P<0,01, y Repeated Sprint Ability F=12,950 P<0,01. Se concluye que la influencia de las condiciones antropométricas favorables se relaciona con un mejor desempeño en las pruebas físicas en esta población de jóvenes futbolistas que se encuentran en la época del salto de crecimiento.

The purpose of this study was to compare soccer players' physical fitness and describe them according to Peak Height Velocity (PHV). The participants were 58 young soccer players between 13.46 and 15.31 years old. Basic anthropometry was evaluated, and Peak Height Velocity was determined. Also, six physical tests related to strength, speed, and agility were measured. The physical test was plotted according to PHV, with multiple Pearson correlations among variables. Finally, a sample was compared in an ANOVA, considering the club to which each player belonged to (club A, club B, and club C). It seems that PHV describes strength and speed better than the capacity for agility. The CMJ test had strong correlations with other physical tests, and in ANOVA comparisons, club A had taller, stronger players, with an advanced PHV in comparison to clubs B and C. Likewise, Club A had a better performance in physical tests, mainly in the CMJ F=13.813 P<0.01 medicine ball throw F= 11.053 P<0.01, kicking speed F= 18.916 P<0.01, and repeated sprint Ability F=12.950 P<0.01. In conclusion, favorable anthropometric conditions influence better performance in physical tests in this population of young soccer players in their growth spurt period.

O objetivo deste estudo foi comparar a aptidão física entre jovens futebolistas colombianos e descrever a aptidão de acordo com o pico de velocidade de crescimento. Participaram 58 jogadores com idades entre 13,46-15,31 anos. Foi avaliada uma antropometria básica e determinado o pico de velocidade de crescimento PVC, também foram aplicados seis testes físicos relacionados à força, velocidade e agilidade. Foi usado um gráfico de dispersão para os testes físicos de acordo com o PVC e também múltiplas correlações entre as variáveis, finalmente, os participantes foram divididos em três grupos de acordo com o clube que jogavam, fazendo uma comparação ANOVA entre clube A, B e C. Aparentemente o PVC descreve os testes de força-potência melhor que os testes de agilidade. Nas correlações múltiplas fica evidente uma grande associação entre o CMJ e os demais testes; e na comparação de clubes, o clube A teve jogadores mais altos, mais pesados e com PVC mais avançado, e também apresentou melhor desempenho nos testes, principalmente em CMJ F=13,813 P<0,01 lançamento de bola medicinal F= 11,053 P<0,01, velocidade de remate F= 18,916 P<0,01, e nos sprints repetido F=12,950 P<0,01. Conclui-se que a influência das condições antropométricas está relacionada ao melhor desempenho em testes físicos nesta população de jovens futebolistas colombianos que estão no período de velocidade do crescimento.

Assuntos

RESUMO

The estimation of body fat percentage (%BF) from anthropometry-related data requires population-specific equations to avoid incorrect interpretations in young athletes. Waist girth (WG) has been described as potential predictor of fat mass (FM) in several populations; however, there are no valid WG-based equations to estimate body composition in young Colombian athletes. The aim of this STandardisierte BerichtsROutine für Sekundärdaten Analysen STROSA-based study was twofold: i) to validate the relative fat mass (RFM) and its pediatric version (RFMp) compared to dual-energy x-ray absorptiometry (DXA) and ii) to develop a new equation (F20CA) to estimate the fat mass in Colombian children and adolescent elite athletes. A total of 114 young athletes that belong to the 'Team Medellín' program (58F, 56M; 51 children, 63 adolescents; 14.85 [2.38] years; 55.09 [12.16] kg; 162.38 [11.53] cm) participated in this cross-sectional study. The statistical analysis revealed a poor correlation, agreement and concordance of RFMp and RFM estimations with DXA measurements. After model specification using both Ordinary Least Square method and Bayesian analysis, the regression output revealed that sex, body mass-to-waist ratio, and waist-to-stature ratio were the statistically significant predictor variables that account for variability in FM. The new F20CA equation is expressed as FM (kg) = 5.46 ∗ (Sex) + 0.21 ∗ (BM/W [kg/m]) + 81.7 ∗ (W/Stature [cm/cm]) - 41.8 (R2 = 0.683; SEE = 2.468 kg), where sex is 0 for males and 1 for females. A moderate-to-high correlation and agreement of the F20CA was confirmed within the internal validation data set (R2 = 0.689; ICC [95%CI] = 0.805 [0.615, 0.904]; RMSE = 2.613 kg). The Bland-Altman analysis corroborated the high concordance between the reference method (DXA) and the F20CA-estimated FM (bias [95% LoA] = 1.02 [-3.77, 5.81] kg), indicating the two methods could be considered interchangeable. Even though external validation is needed, practitioners are advised to use the F20CA in young Colombian athletes with similar characteristics to those who participated in this study.

Assuntos

RESUMO

This study verified the effects of body size and game position on interactions performed by young soccer players in small-sided games (SSG). The sample consisted of 81 Brazilian soccer players (14.4 ± 1.1 years of age). Height, body mass, and trunk-cephalic height were measured. SSG was applied in the GK + 3v3 + GK format, and Social Network Analyses were carried out through filming the games to obtain the following prominence indicators: degree centrality, closeness centrality, degree prestige, and proximity prestige, in addition to network intensity and number of goals scored. Factorial ANCOVA (bone age as covariate) was used to test the effects of game position, body size, and respective interaction on centrality measurements (p < 0.05). Similarity between game positions in body size indicators (p > 0.05) was observed. The game position affected degree centrality (p = 0.01, η 2 = 0.16), closeness centrality (p = 0.01, η 2 = 0.11), and network intensity (p = 0.02, η 2 = 0.09), in which midfielders presented the highest network prominence values when compared to defenders and forwards. In conclusion, midfielders are players with high interaction patterns in the main offensive plays, which behavior is independent of body size.

RESUMO

The present study examined the influence of the specialization onset on the magnitude and patterns of changes in basketball-specific physical fitness within a competitive season and developmental fitness trends between 11 and 17 years in young basketball players. Repeated measures of 181 young basketball players (female, n = 40; male, n = 141) were examined. Anthropometry, age, estimated maturity status, and basketball-specific physical fitness (assessed with the countermovement jump, line drill, and yo-yo intermittent recovery level-1 and fitness score) were considered. Players were grouped by the onset of specialization as related to biological maturation milestones (pre-puberty, mid-puberty, and late-puberty specialization). The within-season and developmental changes in physical fitness were fitted using multilevel modeling in a fully Bayesian framework. The fitness outcomes were similar between-player and within-player changes when grouped by specialization across a season. Fitness improvements across a season were apparent for female players, while male players maintained their performance levels. There was no variation in the patterns of physical fitness development between 11 and 17 years associated with the onset of specialization. Conditional on our data and models, the assumption that early sport specialization provides a physical fitness advantage for future athletic success does not hold.

RESUMO

RESUMO Objetivou-se comparar a importância atribuída (IA) e o domínio percebido (DP) de conhecimento e competências de treinadores de rugby do campeonato nacional juvenil. Treinadores das seleções estaduais de rugby (n=19) responderam o Questionário dos Conhecimentos e Competências do Treinador sobre a IA e o DP classificados em escala Likert. O teste de Wilcoxon foi realizado para comparar IA e DP. Os resultados relacionados aos conhecimentos apresentaram IA significativamente maior que DP. Nas competências, apenas o item "planejar uma sessão de treino" não apresentou diferença significativa entre IA e DP. Conclui-se que a IA é maior que o DP em diversas questões relacionadas aos conhecimentos e competências percebidas de treinadores de rugby juvenil.

ABSTRACT The aim was to compare the assigned importance (AI) and the perceived domain (PD) of knowledge and competences of rugby coaches in the national youth championship. Coaches from state rugby teams (n=19) answered the Coach Knowledge and Competences Questionnaire on AI and PD classified on a Likert scale. Wilcoxon test was performed to compare AI and PD. The results related to knowledge showed significantly higher AI than PD. In competences, only the item "planning a training session" showed no significant difference between AI and PD. It is concluded that AI is higher PD in several questions related to the knowledge and perceived skills of youth rugby coaches.

RESUMEN El objetivo fue comparar la importancia asignada (AI) y el dominio percibido (DP) de conocimientos y habilidades de los entrenadores de rugby en el campeonato nacional juvenil. Los entrenadores de los equipos estatales de rugby (n=19) respondieron el Cuestionario de conocimientos y habilidades para entrenadores sobre IA y DP clasificados en una escala Likert. Se realizó la prueba de Wilcoxon para comparar AI y DP. Los resultados relacionados con el conocimiento mostraron AI significativamente superior a DP. En competencias, solo el ítem "planificación de una sesión de entrenamiento" no mostró diferencia significativa entre IA y DP. Se concluye que AI es mayor DP en varias preguntas relacionadas con el conocimiento y las habilidades percibidas de los entrenadores de rugby juvenil.