Circadian rhythm effect on physical tennis performance in trained male players     

Álvaro López-Samanes  Diego Moreno-Pérez  José L. Maté-Muñoz  Raúl Domínguez  Jesús G. Pallarés  Ricardo Mora-Rodriguez 《Journal of sports sciences》2017,35(21):2121-2128

To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS), agility T-test (AGIL) and a 10-m sprint (10-m RUN). In a randomised, counter-balance order, tennis players underwent the test battery twice, either in the morning (i.e., AM; 9:00 h) and in the afternoon (i.e., PM; 16:30 h). Paired t-tests were used to analyse differences due to time-of-day in performance variables. Comparison of morning versus afternoon testing revealed that SVA (168.5 ± 6.5 vs. 175.2 ± 6.1 km · h^?1; P = 0.003; effect size [ES] = 1.07), CMJ (32.2 ± 0.9 vs. 33.7 ± 1.1 cm; P = 0.018; ES = 1.46), AGIL (10.14 ± 0.1 vs. 9.91 ± 0.2 s; P = 0.007; ES = 1.23) and 10-m RUN time (1.74 ± 0.1 vs. 1.69 ± 0.1 s; P = 0.021; ES = 0.67) were significantly blunted during the morning testing. However, IS was not affected by time-of-day (P = 0.891). Thus, tennis performance may be reduced when competing in the morning in comparison to early evening. Therefore, coaches and tennis players should focus on schedule the SVA, power, speed and agility training sessions in the afternoon.  相似文献   

Gender differences in adolescents’ choice of heroes and admired adults in five countries     

Juan Diego Estrada  Cristina García-Ael  José Luis Martorell 《Gender and education》2015,27(1):69-87

Seven hundred and sixty-eight adolescents from five countries and regions (USA, Spain, Hong Kong, Qatar, and Malaysia), aged 13–19 (M?=?15.78; SD?=?1.28) years, responded to a questionnaire designed to determine who was their most admired famous adult or hero. Male heroes clearly outnumbered admired females (73.3% vs. 26.7%). There was a pattern of same-sex choices, but it was more likely for girls to choose male heroes than for boys to choose females. Over half of the admired adults were athletes, and movie, television, and music stars. Regarding the personally known adults, there was a more balanced choice of males and females, with parents as the most frequent choice. Results suggest that society continues to fail in providing an adequate supply of female role models.  相似文献   

Epidemiology of injuries in First Division Spanish football     

Javier Noya Salces  Pedro M. Gómez-Carmona  Diego Moliner-Urdiales  Manuel Sillero-Quintana 《Journal of sports sciences》2014,32(13):1263-1270

Abstract

The aim was to examine the injuries sustained by Spanish football players in the First Division and to compare injury-related variables in the context of both competition and training. The injury data were prospectively collected from 16 teams (427 players) using a specific web-based survey during the 2008/2009 season. A total of 1293 injuries were identified (145 were recurring injuries). The overall injury incidence was 5.65 injuries per 1000 h of exposure. Injuries were much more common during competition than during training (43.53 vs. 3.55 injuries per 1000 h of exposure, P < 0.05). Most of the injuries (89.6%) involved the lower extremities, and overuse (65.7%) was the main cause. Muscle and tendon injuries were the most common types of injury (53.8%) among the players. The incidence of training injuries was greater during the pre-season and tended to decrease throughout the season, while the incidence of competition injuries increased throughout the season (all P < 0.05). In conclusion, the results of this study suggest the need for injury prevention protocols in the First Division of the Spanish Football League to reduce the number of overuse injuries in the muscles and tendons in the lower extremities. In addition, special attention should be paid during the pre-season and the competitive phase II (the last four months of the season) in order to prevent training and competition injuries, respectively.  相似文献   

Book reviews     

Robin Richardson  Angel Diego Marquez 《Prospects》1984,14(4):551-557

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Anthropometric profiles of elite older triathletes in the Ironman Brazil compared with those of young Portuguese triathletes and older Brazilians     

Silva DA  Benedetti TR  Ferrari EP  Meurer ST  Antes DL  Silva AM  Santos DA  Matias CN  Sardinha LB  Vieira F  Petroski EL 《Journal of sports sciences》2012,30(5):479-484

The objective of this study was to describe the anthropometric profiles of elite older triathletes participating in the 2009 Ironman Brazil and to compare their somatotype, anthropometric and body composition characteristics with those of elite young triathletes and older non-athletes. The sample consisted of 64 males, divided into three groups: (1) older triathletes (n = 17), (2) young triathletes (n = 24), and (3) older non-athletes (n = 23). Somatotype was analysed according to the Carter and Heath ( 1990 ) method. Body mass index, sum of four skinfolds, percentage body fat, body fat mass, and fat-free mass were also estimated. Older non-athletes had higher endomorphy, sum of four skinfolds, fat percentage, and body fat mass than the athletes. Older athletes who participated in the Ironman and elite young triathletes had higher fat-free mass than older non-athletes. Older triathletes and older non-athletes were considered mainly endomorphic mesomorphs and young triathletes mainly ectomorphic mesomorphs. The findings that characterize the anthropometric profile of athletes in this sports modality could be used as a reference.  相似文献   

The privatisation of education: a political economy of global education reform     

Diego Santori 《教育政策杂志》2018,33(2):322-323

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Advancing virtual patient simulations through design research and interPLAY: part I: design and development     

Atsusi Hirumi  Andrea Kleinsmith  Kyle Johnsen  Stacey Kubovec  Michael Eakins  Kenneth Bogert  Diego J. Rivera-Gutierrez  Ramsamooj Javier Reyes  Benjamin Lok  Juan Cendan 《Educational technology research and development : ETR & D》2016,64(4):763-785

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The educator in the Latin American context     

Angel Diego Márquez 《Prospects》1975,5(2):227-229

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Values,intelligence and client behavior in career counseling: A field study     

Lilach Sagiv  Shalom H. Schwartz 《European Journal of Psychology of Education - EJPE》2004,19(3):237-254

We examine relations of values and intelligence to overt behavior in a field study of clients in career counseling (N=365). Eleven counselors reported their clients' independence, activity and insightfulness behaviors. As predicted, both values and intelligence correlated substantially with particular behaviors. Activity and independence correlated positively with self-direction and achievement values and negatively with conformity and tradition values. Independence correlated positively with maturity values as well. Insightfulness correlated positively with maturity values and negatively with conformity and tradition values. All three behaviors correlated positively with intelligence. Values predicted behavior over and above intelligence, but intelligence added to the prediction by values only for the clients of some counselors. Implications of the findings for research on values and behavior are discussed.  相似文献   

Pre-service Teachers’ False Beliefs in Superstitions and Pseudosciences in Relation to Science and Technology     

Fuertes-Prieto  Miguel Ángel  Andrés-Sánchez  Santiago  Corrochano-Fernández  Diego  Urones-Jambrina  Carmen  Delgado-Martín  Mª Laura  Herrero-Teijón  Pablo  Ruiz  Camilo 《Science & Education》2020,29(5):1235-1254

Science & Education - In order to increase scientific competence within the general population, it is important that teachers and educators have a realistic image of science and scientists,...  相似文献