Research hotspots and trend analysis of puberty development among children and adolescents from 2013 to 2022 / 中国学校卫生

Objective@#To analyze the hotspots, frontiers, and future research trends related to puberty development among children and adolescents from 2013 to 2022, and to provide a reference for subsequent research related to puberty development.@*Methods@#Data related to puberty development from 2013 to 2022 were retrieved from the Web of Science core collection with the search formula "puberty timing (title) OR puberty development (title) OR pubertal timing (title) OR pubertal development (title) OR puberty timing (abstract) OR puberty development (abstract) OR pubertal timing (abstract) OR pubertal development (abstract)". The CiteSpace was used for visual analysis.@*Results@#A total of 6 684 publications were obtained and an upward trend could be seen in the number of publications in the field of puberty development in the last 10 years. Researchers with a high number of publications were Juul Anders, Brix Nis, and Ernst Andreas, in addition, the United States had the highest number of publications ( 2 125 ) and the highest betweenness centrality (0.23) in this field. In the last decade, research hotspots had focused on the timing of pubertal initiation, biological mechanisms of pubertal development, and sex differences in pubertal development. Research on environmental endocrine disruptors and the mechanisms of pubertal development were at the forefront of research and future research trends.@*Conclusion@#Scholars can refer to the research hotspots and research trends in this field and focus on the issues related to environmental endocrine disruptors and pubertal development mechanisms.

Comorbidity of myopia and obesity and the moderating role of lifestyle among primary and secondary school students in Inner Mongolia Autonomous Region in 2021 / 中国学校卫生

Objective@#To describe the current status of the prevalence of co-morbid myopia and obesity among 7-18 years students in the Inner Mongolia Autonomous Region in 2021 and to analyze the moderating effect of lifestyle in this association ，so as to provide scientific basis for the establishment of the mechanism of Co-morbidity，Shared Etiology，and Shared Prevention of common diseases in children and adolescents.@*Methods@#A total of 139 630 primary and secondary school students aged 7-18 years from Inner Mongolia Autonomous Region were selected by stratified random cluster sampling method in September,2021. Myopia was determined using distance visual acuity examination and refractive error examination, and obesity was determined according to the BMI classification criteria for overweight, obesity screening of Chinese school age children and adolescents. Used a questionnaire, healthy lifestyles were determined according to the American Heart Association s Healthy Lifestyle Score by totaling the six scores for smoking, alcohol consumption, diet, exercise, screen time, and sleep duration.The χ 2 test was used to compare the association between group differences in the co-morbidity rate of myopia and obesity. The multivariable Logistic regression model was used to explore the influencing factors of the co-morbidity of myopia and obesity, and the stratified analysis was used to analyze the moderating effect of lifestyles on the prevalence of the co-morbidity.@*Results@#The prevalence of myopia and obesity co-morbidity among students aged 7-18 years old in the Inner Mongolia Autonmous Region in 2021 was 13.7%, higher among boys than girls ( 15.5 % vs. 11.8%), higher among those aged 10-12 years old than 7-9,13-15,and 16-18 years old (14.7%,13.7%, 13.3%, 12.0%), higher among other ethnic minorities than Han Chinese and Mongolians (15.3%, 14.0%, 12.5%), higher in urban areas than that in suburban areas(15.3%, 13.0%), and middle economic level tracts were higher than poor and good tracts (14.8%, 12.9 %, 12.6%) ( χ 2=392.37，115.73，62.80，119.02，121.60, P <0.05). Multivariable Logistic regression modeling showed that unhealthy lifestyles ( OR=1.24, 95%CI=1.19-1.29 ) and middle level of lifestyle score ( OR=1.15, 95%CI=1.10-1.19 ) students had higher prevalence of co-morbidity, and the results were statistically significant among both boys and girls, the age groups of 10- 12, 13-15, and 16-18 years old, as well as the Han and Mongolian ethnic groups (all P <0.05).@*Conclusion@#In 2021, the current situation of myopia and obesity co-morbidity and unhealthy lifestyles among primary and secondary school students in the Inner Mongolia Autonomous Region are not optimistic.

Co-occurrence trend and association study of Internet addiction and depressive symptoms among students in Inner Mongolia Autonomous Region / 中国学校卫生

Objective@#To investigate the prevalence of Internet addiction and depression of students, and to analyze the co-occurrence and trend, so as to provide a theoretical basis for prevention and controlling measures of Internet addiction and depression.@*Methods@#A total of 6 317,7 152,81 808,71 180 and 89 932 students aged 10 to 24 years from 12 leagues (103 banners) in Inner Mongolia Autonomous Region were selected by stratified random cluster sampling in September each year from 2017 to 2021. The Internet Addiction Scale and the Central for Epidemiologic Studies Depression Scale(CES-D) was used to measure Internet addiction and depression. And the annual inspection rate, group difference and annual change trend in students were calculated. Multivariate linear regression and restricted cubic spline analysis were used to estimate the linear and non linear associations between Internet addiction and depression in students.@*Results@#The Internet addiction proportion in students gradually decreased from 4.1% in 2017 to 2.1% in 2020, but increased to 3.9% in 2021. And the depressive symptoms proportion increased from 20.9% in 2017 to 28.0% in 2020 and 27.0% in 2021. The detection rate of Internet addiction and depression comorbidities remained at 1.8% to 2.5 %. The Internet addiction proportion in boys was higher than that in girls( χ 2=42.82， P <0.05). The depressive symptoms prevalence in girls was higher than that in boys( χ 2= 553.90， P <0.05). Taking reversal in prevalence of Internet addiction in urban and rural areas was observed in 2019. The detection rates of depressive symptoms and comorbidity were higher in urban areas than these in suburban counties on the whole, and the difference showed a trend of decreasing or even equalizing year by year. Internet addiction was positively correlated with depressive symptoms score ( B=1.67, 95%CI =1.64-1.71), the proportion of depressive symptoms ( OR=1.39, 95%CI =1.38-1.41) and the proportion of major depressive symptoms ( OR=1.35, 95%CI =1.33-1.36) among students in 2021 ( P <0.05). An N-shaped curve was found in the significant nonlinear associations between internet addiction and depression across sex, region and school stage.@*Conclusion@#Internet addiction and depression in students show significant linear and non-linear associations, which are consistent in different sexes, regions and school stages. Therefore, relevant measures should be made and implemented in each region, especially in suburb areas, so as to prevent the increasingly development of adolescents and children s Internet addiction and depression.

Quality of training in competitive tennis sports / Qualidade do treinamento nas competições esportivas de tênis / Calidad del entrenamiento en las competiciones deportivas de tenis

ABSTRACT Introduction: The current challenge in tennis training in China is the integration with technology because, with the existing training methods, coaches and players pay little attention to strategies using a simple and retrograde tactical training method. Solutions need to be created to meet the development requirements of modern tennis. Objective: This paper aims to analyze tennis players' technical level, tactical characteristics, and training methods in sports competitions. Methods: Eight male tennis players were randomly selected as research volunteers. The various tactics employed by the subjects under competition were observed. Based on the collected data, a mathematical-statistical analysis of the tennis players' technical usage and training performance was prepared. Results: The athletes in this study could use various offensive tactics during and after the experiment. The athletes have a strong offensive baseline and can use a combination of speed, spin, and positioning to restrict each other during the competition. However, there were significant differences in the players' awareness of offensive tactics on defense (P<0.05). Conclusion: Most athletes perform consistently and heterogeneously in stalemate tactics. A weakness noted was that most athletes are not showing good efficiency in scoring when stalemate presents opportunities. The results of this study can improve the scoring rate of tennis players. At the same time, this study's findings may strengthen tennis players' ability to control the game during sports competitions. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

RESUMO Introdução: O desafio atual no treinamento de tênis na China é a integração com a tecnologia pois, com os métodos de treinamento existentes, os treinadores e jogadores prestam pouca atenção às estratégias utilizando um método de treinamento tático simples e retrógrado. Sendo necessária a criação de soluções para atender às exigências de desenvolvimento do tênis moderno. Objetivo: Este estudo visa analisar o nível técnico, as características táticas e os métodos de treinamento dos jogadores de tênis sob competições esportivas. Métodos: Foram selecionados aleatoriamente oito jogadores de tênis masculinos como voluntários de pesquisa. Foram observadas as diversas táticas empregadas pelos sujeitos nas competições. Com base nos dados coletados, uma análise matemática-estatística do uso técnico e do desempenho de treinamento dos tenistas foi elaborada. Resultados: Os atletas deste estudo foram capazes de utilizar uma variedade de táticas ofensivas durante e após o experimento. Os atletas têm uma forte linha de base ofensiva, podendo usar uma combinação de velocidade, giro e posicionamento para restringir uns aos outros durante a competição. No entanto, houveram diferenças significativas na conscientização das táticas ofensivas dos jogadores na defesa (P<0,05). Conclusão: A maioria dos atletas tem um desempenho constante e heterogêneo em táticas de impasse. Um ponto fraco notado foi de que a maioria dos atletas não é apresentou boa eficiência em pontuar quando o impasse apresenta oportunidades. Os resultados deste estudo podem melhorar a taxa de pontuação dos jogadores de tênis. Ao mesmo tempo, as conclusões deste estudo podem fortalecer a capacidade dos jogadores de tênis de controlar o jogo durante as competições esportivas. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

Resumen Introducción: El reto actual en el entrenamiento del tenis en China es la integración con la tecnología porque, con los métodos de entrenamiento existentes, los entrenadores y los jugadores prestan poca atención a las estrategias utilizando un método de entrenamiento táctico simple y retrógrado. La creación de soluciones para satisfacer los requisitos de desarrollo del tenis moderno es necesaria. Objetivo: Este estudio tiene como objetivo analizar el nivel técnico, las características tácticas y los métodos de entrenamiento de los tenistas en las competiciones deportivas. Métodos: Se seleccionaron al azar ocho tenistas masculinos como voluntarios de la investigación. Se observaron las distintas tácticas empleadas por los sujetos en las competiciones. A partir de los datos recogidos, se elaboró un análisis matemático-estadístico del uso técnico y del rendimiento del entrenamiento de los tenistas. Resultados: Los atletas de este estudio pudieron utilizar una variedad de tácticas ofensivas durante y después del experimento. Los atletas tienen una fuerte línea de base ofensiva y pueden utilizar una combinación de velocidad, giro y posicionamiento para restringirse mutuamente durante la competición. Sin embargo, hubo diferencias significativas en el conocimiento de los jugadores de las tácticas ofensivas en defensa (P<0,05). Conclusión: La mayoría de los atletas tienen un rendimiento consistente y heterogéneo en las tácticas de estancamiento. Un punto débil que se observó fue que la mayoría de los atletas no presentan una buena eficacia a la hora de marcar cuando el empate presenta oportunidades. Los resultados de este estudio pueden mejorar el índice de puntuación de los tenistas. Al mismo tiempo, las conclusiones de este estudio pueden reforzar la capacidad de los tenistas para controlar el juego durante las competiciones deportivas. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.