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101.
Pedro Schons Rodrigo Gomes Da Rosa Gabriela Fischer Guilherme Pereira Berriel Carolina Gassen Fritsch Fábio Yuzo Nakamura 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(5):515-526
Knee peak torque (PT) is associated to jump performance in volleyball players. It is not clear whether muscle strength imbalances of the knee joint can influence jump performance. The purpose of study was to analyse the association between PT and knee muscular imbalances with jump performance in professional volleyball players. Eleven elite male volleyball players (90.3 ± 9.7 kg body mass and 1.94 ± 0.06 m height) were evaluated in an isokinetic dynamometer at speeds of 60, 180 and 300 deg/s. Muscle strength imbalances were obtained through calculation of contralateral deficit between limbs and the conventional ratio (hamstrings/quadriceps). Countermovement jump (CMJ) was performed on a force plate to calculate mechanical power and height. Association was found between knee extensor PT at 180 deg/s with CMJ power (r = 0.610, p = 0.046). Conventional ratio at 300 deg/s showed negative association with CMJ (r = ?0.656, p = 0.029). The optimal ratio between knee extensors PT in relation to the flexors PT is associated with the greater mechanical power in CMJ. Contralateral deficit does not seem to be associated with the CMJ performance. Considering the knee extensor PT is associated with CMJ power, our findings suggest that strength-based training in volleyball athletes should not omit the conventional muscle ratio. 相似文献
102.
The aim of this study was to evaluate and compare acute effects of a reciprocal action protocol and a super-set protocol on knee extensor performance during concentric isokinetic exercise. Fourteen men aged 29.4 ± 6.1 years were tested on three different protocols, with 1 min of rest between sets: control (3 sets of 10 isokinetic knee extension repetitions), reciprocal action protocol (3 sets of 10 repetitions of reciprocal isokinetic concentric knee flexion and knee extension repetitions), and super-set protocol (3 sets of a combination of 10 repetitions of knee flexion immediately followed by 10 repetitions of knee extension repetitions). Tests were performed at 60° · s(-1) and 180° · s(-1), randomized across 3 days and separated by at least 72 h. There were no significant differences between protocols for peak torque at 60° · s(-1) or 180° · s(-1). Total work was significantly higher during the reciprocal action protocol compared with the super-set protocol at 60° · s(-1). There was a significant decline in peak torque (from 240.6 to 212.9 N · m) and total work (from 2294 to 1899 J) for the control condition at 60° · s(-1). Also, total work declined significantly across sets for the super-set protocol at 60° · s(-1) (from 2157 to 1707 J). Results indicate that a reciprocal action protocol provides torque maintenance during multiple sets of isokinetic training, both at slow and high velocities. 相似文献
103.
There is little research on homophobia among university-level law enforcement students, nor strategies for teaching gay issues. This paper analyzes gay issues as provided in textbooks for law enforcement students, and homophobia among law enforcement students. A content analysis of textbooks reveals little treatment of gay issues or working with the gay community and the lack of attention is disparate with that granted other minorities. Measures of homophobia comparing law enforcement students with other students indicate that law enforcement students hold higher levels of homophobia. 相似文献
104.
Rodrigo Ramírez-Campillo Marcelo Vergara-Pedreros Carlos Henríquez-Olguín Cristian Martínez-Salazar Cristian Alvarez Fábio Yuzo Nakamura 《Journal of sports sciences》2016,34(8):687-693
In a randomised controlled trial design, effects of 6 weeks of plyometric training on maximal-intensity exercise and endurance performance were compared in male and female soccer players. Young (age 21.1 ± 2.7 years) players with similar training load and competitive background were assigned to training (women, n = 19; men, n = 21) and control (women, n = 19; men, n = 21) groups. Players were evaluated for lower- and upper-body maximal-intensity exercise, 30 m sprint, change of direction speed and endurance performance before and after 6 weeks of training. After intervention, the control groups did not change, whereas both training groups improved jumps (effect size (ES) = 0.35–1.76), throwing (ES = 0.62–0.78), sprint (ES = 0.86–1.44), change of direction speed (ES = 0.46–0.85) and endurance performance (ES = 0.42–0.62). There were no differences in performance improvements between the plyometric training groups. Both plyometric groups improved more in all performance tests than the controls. The results suggest that adaptations to plyometric training do not differ between men and women. 相似文献
105.
Daniela D. Olivares Rodrigo R. Castillo 《Education and Information Technologies》2018,23(6):2309-2321
A literature review on perceptions of the interactive whiteboard during the teaching practicum shows that there has been insufficient analysis of student teachers’ perceptions of Information and Communication Technology (ICT). However, these perceptions are highly useful to create a full picture of the effectiveness – and indeed the drawbacks – of using ICT in the classroom. In this study, we examine and analyse evidence from teaching practica to assess the success of ICT – specifically the interactive whiteboard – as a teaching tool, using a qualitative method. The accounts are first-hand, scientific reflections made by student teachers from La Serena, Chile, during their teaching practicum in primary schools; for this reason they are extremely useful in analysing this teaching tool’s effectiveness in the classroom. Among the main results for students’ perceptions of incorporating technology as part of their training, we found a set of variables for good practice when using the interactive whiteboard, including: incorporating technology as an engaging didactic resource; making the most of technology for improving learning; determining when best to use the whiteboard; and identifying any limiting factors together with students’ suggestions for improvement. 相似文献
106.
Aldo Anzures Tapia Rodrigo Mayorga Gabrielle Oliveira Lesley Bartlett Chelsea Kallery Cynthia N. Carvajal 《Ethnography and Education》2017,12(3):347-366
This paper examines how a transnational orientation shapes Dominican mothers’ contradictory attitudes towards education in New York City. Through this ethnographic study, which draws on 36 interviews, community walkabouts, and participant observations in community-led adult education classes, we show how Dominican mothers struggle with conflicting values; on the one hand, they embrace the idea of schooling for individual advancement, integration in the US, and critical thinking, while on the other hand, they regret the diminution of a collective, family orientation and respect for parents. Overall, this study shows that contradictions are not a sign of confusion or denial, but rather a struggle to transform cultural practices that satisfy multiple worlds. A deeper understanding of these contradictions could help educators and educational institutions consider how these transnational tensions motivate parent engagement and their hopes for their children’s education. 相似文献
107.
Goycolea Rodrigo Castro-Alonso Juan C. Dörr Anneliese 《Educational Psychology Review》2021,33(2):619-635
Educational Psychology Review - Using cannabis (e.g., smoking marijuana) is becoming popular, partly due to a legalization trend across different countries. This tendency has resulted in cannabis... 相似文献
108.
Nicolás Robinson-Garcia Cassidy R. Sugimoto Dakota Murray Alfredo Yegros-Yegros Vincent Larivière Rodrigo Costas 《Journal of Informetrics》2019,13(1):50-63
This paper presents a methodological framework for developing scientific mobility indicators based on bibliometric data. We identify nearly 16 million individual authors from publications covered in the Web of Science for the 2008–2015 period. Based on the information provided across individuals’ publication records, we propose a general classification for analyzing scientific mobility using institutional affiliation changes. We distinguish between migrants--authors who have ruptures with their country of origin--and travelers--authors who gain additional affiliations while maintaining affiliation with their country of origin. We find that 3.7% of researchers who have published at least one paper over the period are mobile. Travelers represent 72.7% of all mobile scholars, but migrants have higher scientific impact. We apply this classification at the country level, expanding the classification to incorporate the directionality of scientists’ mobility (i.e., incoming and outgoing). We provide a brief analysis to highlight the utility of the proposed taxonomy to study scholarly mobility and discuss the implications for science policy. 相似文献
109.
Willingness toward organ and body donation among anatomy professors and students in Mexico 
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下载免费PDF全文 Alejandro Quiroga‐Garza Cynthia Guadalupe Reyes‐Hernández Pablo Patricio Zarate‐Garza Claudia Nallely Esparza‐Hernández Jorge Gutierrez‐de la O David de la Fuente‐Villarreal Rodrigo Enrique Elizondo‐Omaña Santos Guzman‐Lopez 《Anatomical sciences education》2017,10(6):589-597
Most anatomists agree that cadaver dissection serves as a superior teaching tool in human anatomy education. However, attitudes toward body donation vary widely between different individuals. A questionnaire was developed to determine the attitudes toward body and organ donation among those who learn the most from cadavers: medical students, medical student teaching assistants, medical students involved in research, and anatomy professors. A cross‐sectional, prospective study was designed in which the questionnaire was distributed among first‐year human anatomy students before undertaking cadaver dissection at the beginning of the semester, and then again after a commemoration service at the end of the course. The questionnaire items included demographic data, as well as questions designed to characterize participants' attitudes regarding body/organ donation from strangers, family members, and whether participants would consider such practices with their own bodies. Out of a total of 517 students enrolled in the Human Anatomy course in the Medical School at the Universidad Autónoma de Nuevo León, Mexico during January to June 2016, 95% responded to the first (491) and second (490) surveys. Participants' opinions on their own organ donation was similar before and after exposure to cadaver dissection, with between 87% and 81% in favor of such practices, and only 3% against it, in both surveys. Participants' willingness to donate their own bodies, as well as those of family members, increased, while reluctance regarding such practices decreased by half (P < 0.0001 and P < 0.05). Professors had the highest rates of positive opinions regarding their own body donation (74.9%), with 18.8% undecided. Low opposition toward organ and body donation remains prevalent among both anatomists and physicians in training in Mexico. Anat Sci Educ 10: 589–597. © 2017 American Association of Anatomists. 相似文献
110.
In recent years there has been a debate over the alleged superiority of achievement tests over aptitude tests on the grounds that the first would be fairer for college admissions and less influenced by family background. The switch from aptitude tests to achievement tests in Chile presented a unique opportunity to examine this claim. Regression analysis was used to assess the impact of the change in test performance using data from seven cohorts of test-takers. The evidence does not support the superiority of achievement tests, particularly when these assess extensive contents. 相似文献