Characteristics of the means and methods used in soccer training / Características dos meios e métodos utilizados no treinamento de futebol / Características de los medios y métodos utilizados en el entrenamiento de fútbol

ABSTRACT Introduction The correct understanding and implementation of the tasks set by the coach for the player are achieved through a wide variety of training sessions. To date, the question of training effectiveness and the preparation of professional soccer players for matches has not been sufficiently studied. Objective Study the means and methods used in soccer training. By comparison, find out which method is most effective in achieving a positive result during the game and maintaining the players' health. Methods The study used mathematical and physical methods and comparative analysis. In the study, the main training methods in a team were considered. A comparative analysis was made between two types of individual soccer players' training to improve physical and technical parameters. Result We established which parameters influence the choice of the training scheme. The effectiveness of both training systems is proven by the statistical indicators of soccer players who train according to these methods. Conclusion The effectiveness of the training methodology chosen by a soccer player depends on his initial physical abilities and professional skills. The study's practical significance is determined by the fact that the proposed methods can be used in training professional athletes. Evidence level II; Therapeutic studies - outcomes research.

RESUMO Introdução A correta compreensão e implementação das tarefas definidas pelo treinador para o jogador é alcançada através de uma ampla variedade de sessões de treinamento. Até hoje, a questão da eficácia do treinamento e a preparação dos jogadores profissionais de futebol para os jogos não foi suficientemente estudada. Objetivo Estudar os meios e métodos utilizados no treinamento de futebol e, por comparação, descobrir qual dos métodos é mais eficaz para obter um resultado positivo durante o jogo e manter a saúde dos jogadores. Métodos O estudo utilizou métodos matemáticos e físicos, assim como análise comparativa. No decorrer do estudo, foram considerados os principais métodos de treinamento em uma equipe. Foi realizada uma análise comparativa entre dois tipos de treinamento individual de jogadores de futebol, objetivando melhorar parâmetros físicos e técnicos. Resultado Foram estabelecidos quais parâmetros influenciam a escolha do esquema de treinamento. A eficácia de ambos os sistemas de treinamento é comprovada pelos indicadores estatísticos dos jogadores de futebol que treinam de acordo com estes métodos. Conclusão A eficácia da metodologia de treinamento escolhida por um jogador de futebol depende de suas habilidades físicas iniciais e habilidades profissionais. O significado prático do estudo é determinado pelo fato de que os métodos propostos podem ser utilizados no treinamento de atletas profissionais. Evidência nível II; Estudos terapêuticos - pesquisa de resultados.

RESUMEN Introducción La correcta comprensión y ejecución de las tareas establecidas por el entrenador para el jugador se consigue a través de una amplia variedad de sesiones de entrenamiento. Hasta hoy, la cuestión de la eficacia del entrenamiento y la preparación de los futbolistas profesionales para los partidos no se ha estudiado suficientemente. Objetivo Estudiar los medios y métodos utilizados en el entrenamiento de fútbol y, por comparación, averiguar qué método es más eficaz para conseguir un resultado positivo durante el juego y mantener la salud de los jugadores. Métodos El estudio utilizó métodos matemáticos y físicos, así como análisis comparativos. En el transcurso del estudio, se consideraron los principales métodos de formación en un equipo. Se realizó un análisis comparativo entre dos tipos de entrenamiento individual de jugadores de fútbol, con el objetivo de mejorar los parámetros físicos y técnicos. Resultado Se estableció qué parámetros influyen en la elección del esquema de entrenamiento. La eficacia de ambos sistemas de entrenamiento queda demostrada por los indicadores estadísticos de los futbolistas que entrenan según estos métodos. Conclusión La eficacia de la metodología de entrenamiento elegida por un futbolista depende de sus capacidades físicas iniciales y de sus habilidades profesionales. La importancia práctica del estudio viene determinada por el hecho de que los métodos propuestos pueden utilizarse en el entrenamiento de atletas profesionales. Nivel de evidencia II; Estudios terapéuticos - investigación de resultados.

Relationship between the after-school schedule and bone mineral density in middle-school students in Shanghai / 中国学校卫生

Objective@#To investigate the relationship between after-school schedule and bone mineral density in middle-school students in Shanghai, to provide a reference for taking targeted measures.@*Methods@#From November 2017 to April 2018，eighteen classes of six middle schools in Shanghai (from urban districts, urban-suburb combined districts and suburban districts, respectively) were selected based on cluster random sampling. In each school, 2-4 classes were further randomly chosen in the 6th grade. Questionnaires were completed by 518 students and their parents, as well as physical examination and bone mineral density assessment.@*Results@#The average time spent on after-school academic learning during weekends was 4.0 (IQR: 2.0, 6.0) h. The Z-score of bone density was 0.3 (IQR: -0.7, 1.0). The smooth curve fit model showed a non-linear relationship between after-school academic learning time during weekends and the Z-scores of bone mineral densities. A two-stage multiple linear regression analysis was further applied according to the fit results, and the results showed that when total afterschool academic learning time <4.5 hours during weekends, the learning time was inversely correlated with the bone density Z-scores (β=-0.11,P=0.01), and when the learning time ≥4.5 hours, there was no significant correlation between the learning time and bone density Z-scores (β=0.02, P=0.65). Parent and student questionnaires showed that there was a non-linear relationship between students’ daily time spent on outdoor sports-related activities and bone density Z-scores. When time spent on the outdoor activities ≥45 minutes per day, outdoor activities were positively correlated with bone density Z-scores (P<0.05). However, when the time spent on outdoor activities <45 minutes per day, there was no significant relationship between outdoor activities and bone density Z-scores (P>0.05).@*Conclusion@#Too much time on after-school academic learning during weekends or limited time on outdoor activities are both related to impaired bone mineral densities. Therefore, a reasonable after-school schedule for middle-school students is important for physical development, especially during weekends.

Comparison of the shaping ability of different nickel-titanium instruments in simulated root canals in resin / 口腔疾病防治

Objective @#To compare the shaping ability of 3 different nickel (Ni)-titanium (Ti) systems in simulated root canals in resin and to provide a reference for clinicians.@*Methods@#Forty-eight resin blocks were prepared using the F360 (Komet, Brasseler GmbH & Co., Lemgo, Germany) (Group 1), F6 SkyTaper (20/06) (Komet, Brasseler GmbH & Co., Lemgo, Germany) (Group 2), F6 SkyTaper (25/06) (Komet, Brasseler GmbH & Co., Lemgo, Germany) (Group 3) and Reciproc R25 systems (VDW, Munich, Germany) (Group 4) (n=12 canals/group). The images taken before and after preparation were superimposed and analyzed by Adobe Photoshop v7.0. The amount of resin removed by each system was measured, and the centering ability was assessed. The data were statistically analyzed using SPSS 20.0.@*Results @#At the 1 mm point, the transportation in Group 4 [(0.10 ± 0.03) mm] was significantly greater than that in Groups 2 [(0.05 ± 0.03) mm] and 3 [(0.05 ± 0.03) mm] (P < 0.05). At the 8 mm and 9 mm points, the transportation values in Group 4 [(0.12 ± 0.06) mm and (0.13 ± 0.05) mm] were significantly higher than those in Groups 2 [(0.05 ± 0.05) mm and (0.05 ± 0.05) mm] and 3 [(0.05 ± 0.04) mm and (0.06 ± 0.05) mm] (P < 0.05). At the 10 mm point, the transportation was significantly greater in Group 4 [(0.13 ± 0.06) mm] than in Group 2 [(0.06 ± 0.06) mm].@*Conclusion@#F6 SkyTaper exhibits better centering ability than Reciproc.

XPG is a novel biomarker of clinical outcome in advanced non-small-cell lung cancer

Polymorphisms in XPG were considered to contribute to the clinical outcome of patients receiving platinum drug chemotherapy. We investigated the impact of several potential SNPs of XPG on the efficacy of platinum-based chemotherapy in NSCLC patients. A total of 433 patients were consecutively selected between Nov. 2006 and Dec. 2007, and were followed-up up to Nov. 2011. The genotyping of six SNPs [rs2296147, rs751402, rs873601, rs4150375, rs17655 and rs2094258] were genotyped using the Taqman real-time PCR method with a 7900 HT sequence detector system. Patients carrying CT+TT genotype of rs2296147 had a significantly longer median PFS [17.5 months] and OS [26.8 months] than CC genotype. Hazard ratio [HR] for PFS and OS in patients with CT+TT genotype of rs2296147 was respectively 0.73[0.51-0.97] and 0.66[0.48-0.99] when compare CC genotype, respectively. Similarly, patients with rs2094258 AG+GG genotype had a longer median progression time [18.4 months] and overall survival time [27.3 months] when compared with those with AA genotype, and HRs[95% CI] for PFS and OS were 0.44[0.34-0.78] and 0.51[0.39-0.82], respectively. Our study suggests rs2296147 CT+TT and rs2094258 AG+GG genotypes contribute to the better survival of NSCLC. Our study provides significant information on role of prognostic value of XPG SNPs, and detecting of XPG could be used as predictive markers toward individualizing NSCLC treatment strategies

Prognostic Factors for Patients after Curative Resection for Proximal Gastric Cancer / 华中科技大学学报（医学）（英德文版）

The factors influencing the long-term survival of patients with proximal gastric cancer(PGC)after curative resection were investigated.Data from 171 patients who underwent curative resection for PGC were retrospectively analyzed.The patients were grouped according to the clinicopathological factors and operative procedures.The tumor depth(T stage)and lymph node metastasis(pN stage)were graded according to the fifth edition of TNM Staging System published by UICC in1997.The metastatic lymph node ratio(MLR)was divided into four levels: 0%,<10%,10%-30%and >30%.The data of survival rate were analyzed by Kaplan-Meier method(log-rank test)and Cox regression model.The 5-year overall survival rate of 171 patients was 37.32%.The univariate analysis demonstrated that the survival time of the postoperative patients with PGC was related to tumor size(;(2=4.57,P=-0.0325),gross type(χ2=21.38,P<0.001),T stage(χ2=27.91,P<0.001),pN stage(χ2=44.72,P<0.001),MLR(χ2=61.12,P<0.001),TNM stage(χ2=44.91,P<0.001),and range of gastrectomy (χ2=4.36,P=0.0368).Multivariate analysis showed that MLR(χ2=10.972,P=0.001),pN stage(χ2=6.640,P=0.010),TNM stage(χ2=7.081,P=0.007),T stage(χ2=7.687,P=0.006)and gross type(χ2=6.252,P=0.012)were the independent prognostic factors.In addition,the prognosis of patients who underwent total gastrectomy(TG)was superior to that of patients who underwent proximal gastrectomy(PG)for the cases of tumor ≥5 cm(χ2=6.31,P=0.0120),Borrmann Ⅲ/Ⅳ(χ2=7.96,P=0.0050),T4(χ2=4.57,P=0.0325),pN2(χ2=5.52,P=0.0188),MLR 10%-30%(χ2=4.46,P=0.0347),MLR >30%(χ2=13.34,P=0.0003),TNM Ⅲ(χ2=14.05,P=0.0002)or TNM Ⅳ stage(χ2=4.37,P=0.0366);and combining splenectomy was beneficial to the cases of T3(χ2=5.68,P=0.0171)or MLR >30%(χ2=6.11,P=0.0134).It was concluded that MLR,pN stage,TNM stage,T stage,and gross type had advantages in providing a precise prognostic evaluation for patients undergoing curative resection for PGC,in which MLR was the most valuable index.TG and combining splenectomy were useful to improve the prognosis to patients with PGC of TNM Ⅲ/Ⅳ stage,serosa invasion,or extensive regional lymph node metastasis.