Electromyographic analysis of lower limb muscles during the golf swing performed with three different clubs     

Sérgio Marta  Luís Silva  João Rocha Vaz  Maria António Castro  Gustavo Reinaldo  Pedro Pezarat-Correia 《Journal of sports sciences》2016,34(8):713-720

The aim of this study was to describe and compare the EMG patterns of select lower limb muscles throughout the golf swing, performed with three different clubs, in non-elite middle-aged players. Fourteen golfers performed eight swings each using, in random order, a pitching wedge, 7-iron and 4-iron. Surface electromyography (EMG) was recorded bilaterally from lower limb muscles: tibialis anterior, peroneus longus, gastrocnemius medialis, gastrocnemius lateralis, biceps femoris, semitendinosus, gluteus maximus, vastus medialis, rectus femoris and vastus lateralis. Three-dimensional high-speed video analysis was used to determine the golf swing phases. Results showed that, in average handicap golfers, the highest muscle activation levels occurred during the Forward Swing Phase, with the right semitendinosus and the right biceps femoris muscles producing the highest mean activation levels relative to maximal electromyography (70–76% and 68–73% EMG_MAX, respectively). Significant differences between the pitching wedge and the 4-iron club were found in the activation level of the left semitendinosus, right tibialis anterior, right peroneus longus, right vastus medialis, right rectus femuris and right gastrocnemius muscles. The lower limb muscles showed, in most cases and phases, higher mean values of activation on electromyography when golfers performed shots with a 4-iron club.  相似文献   

Space occupation near the basket shapes collective behaviours in youth basketball     

Pedro T. Esteves  Pedro Silva  Luís Vilar  Bruno Travassos  Ricardo Duarte  Jorge Arede 《Journal of sports sciences》2016,34(16):1557-1563

This study aimed to analyse how youth basketball players explored numerical overloads during shot attempts by measuring their space occupation across specific court areas. Four process-tracing variables measured how the number of attackers (NA), number of defenders (ND), interpersonal distance between attacker and the closest defender (ID) and distance between attacker and the basket (DBkt) impacted on the performance outcome (converted shot; missed shot; ball possession lost). Ten competitive games involving 13 U14 teams were video recorded and players’ displacements were digitised. The associations between performance outcomes and the process-tracing measures were assessed using standardised mean differences and a cross-correlation function. A multinomial logistic regression was used to calculate the odds ratio (OR) for each of the three possible outcomes. Results revealed that when shot attempts occurred at larger ID and at smaller DBkt, the possibilities to obtain a converted shot increased. The numerical overload of defenders near the scoring target was predominantly associated with offensive success. Also, the possibility of attackers to lead the spatial relation of movements with the defenders, near the scoring target, appeared as a prominent strategy to succeed. In sum, basketball teams that exhibit potential to adapt their collective behaviours to local changes in the environment might be closer to achieving successful outcomes.  相似文献   

Confronting the urban in urban school refor     

Dr. Pedro A. Noguera 《The Urban Review》1996,28(1):1-19

The ways in which urban schools respond to and are affected by the urban environment are explored through a case study analysis of Lowell Middle School, located in the West Oakland section of Oakland, California. The connection between the social environment and urban schools is generally ignored in most school reform initiatives. The unwillingness of policymakers to confront the environmental aspects of the problems facing urban schools is due to the often unstated belief that nothing can actually be done to address the plight of urban areas. In many of these communities, the urban public school is one of few social institutions that provide a degree of stability and social support to the individuals and families that are served. As the only public agency charged with serving all young people regardless of their status, the urban school has the potential to play a leading role in the revitalization of urban areas. This possibility is explored within the context of ongoing efforts at Lowell Middle School to promote educational reform by bridging the gap between the school and the community.  相似文献   

Prospective teachers’ understanding of the multiplicative part-whole relationship of fraction     

Elena Castro-Rodríguez  Demetra Pitta-Pantazi  Luis Rico  Pedro Gómez 《Educational Studies in Mathematics》2016,92(1):129-146

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New Governance and New Knowledge Brokers: Think Tanks and Universities as Boundary Organizations     

Gary Anderson  Pedro De La Cruz  Andrea López 《Peabody Journal of Education》2017,92(1):4-15

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Sensor-based physical activity,sedentary time,and reported cell phone screen time: A hierarchy of correlates in youth     

Pedro B. Júdice  Joo P. Magalhes  Gil B. Rosa  Duarte Henriques-Neto  Megan Hetherington-Rauth  Luís B. Sardinha 《运动与健康科学(英文)》2021,10(1):55

BackgroundEvidence on correlates relies on subjective metrics and fails to include correlates across all levels of the ecologic model. We determined which correlates best predict sensor-based physical activity (PA), sedentary time (ST), and self-reported cell phone screen time (CST) in a large sample of youth, while considering a multiplicity of correlates.MethodsUsing sensor-based accelerometry, we assessed the PA and ST of 2179 youths. A χ² automatic interaction detection algorithm was used to hierarchize the correlates associated with too much ST (> 50th percentile), insufficient moderate-to-vigorous PA (MVPA) (<60 min/day), and prolonged CST (≥2 h/day).ResultsAmong youth 10–14 years old, the correlates for being inactive consisted of being a girl, not having sport facilities in the neighborhood, and not perceiving the neighborhood as a safe place, whereas in the youth 15–18 years old, the correlate for being inactive was not performing sports (9.7% chance of being active). The correlates for predicting high ST in the younger group was not performing sports (55.8% chance for high ST), and in the older group, the correlates were not owning a pet, perceiving the neighborhood as safe, and having inactive parents (63.7% chance for high ST). In the younger group, the greatest chances of having high CST were among those who were in the last elementary school years, who were girls, and who did not have friends in the neighborhood (73.1% chance for high CST), whereas in the older group, the greatest chance for having high CST was among those who were girls and had a TV in the bedroom (74.3% chance for high CST).ConclusionTo counteract ST and boost MVPA among youths, a specific focus on girls, the promotion of sport participation and facilities, neighborhood safety, and involvement of family must be prioritized.  相似文献   

The Effectiveness of Concept Maps in Teaching Physics Concepts Applied to Engineering Education: Experimental Comparison of the Amount of Learning Achieved With and Without Concept Maps     

Guadalupe Martínez  Ángel Luis Pérez  María Isabel Suero  Pedro J. Pardo 《Journal of Science Education and Technology》2013,22(2):204-214

A study was conducted to quantify the effectiveness of concept maps in learning physics in engineering degrees. The following research question was posed: What was the difference in learning results from the use of concept maps to study a particular topic in an engineering course? The study design was quasi-experimental and used a post-test as a measuring instrument. The sample included 114 university students from the School of Industrial Engineering who were divided into two equivalent homogeneous groups of 57 students each. The amount of learning attained by the students in each group was compared, with the independent variable being the teaching method; the experimental group (E.G.) used concept maps, while the control group (C.G.) did not. We performed a crossover study with the two groups of students, with one group acting as the E.G. for the topic of optical fibers and as the C.G. for the topic of the fundamental particles of matter and vice versa for the other group. For each of the two topics studied, the evaluation instrument was a test of 100 dichotomous items. The resulting data were subjected to a comparative statistical analysis, which revealed a significant difference in the amount of learning attained by the E.G. students as compared with the C.G. students. The results allow us to state that for the use of concept maps, the average increment in the E.G. students’ learning was greater than 19 percentage points.  相似文献   

A multilevel hypernetworks approach to capture meso-level synchronisation processes in football     

João Ribeiro  Rui Lopes  Pedro Silva  Duarte Araújo  Daniel Barreira  Keith Davids 《Journal of sports sciences》2020,38(5):494-502

ABSTRACT

Understanding team behaviours in sports performance requires understanding the interdependencies established between their levels of complexity (micro-meso-macro). Previously, most studies examined interactions emerging at micro- and macro-levels, thus neglecting those emerging at a meso-level (reveals connections between player and team levels, depicted by the emergence of coordination in specific sub-groups of players–simplices during performance). We addressed this issue using the multilevel hypernetworks approach, adopting a cluster-phase method, to record player-simplice synchronies in two performance conditions where the number, size and location of goals were manipulated (first-condition: 6 × 6 + 4 mini-goals; second-condition: Gk + 6 × 6 + Gk). We investigated meso-level coordination tendencies, as a function of ball-possession (attacking/defending), field-direction (longitudinal/lateral) and teams (Team A/Team B). Generally, large synergistic relations and more stable patterns were observed in the longitudinal direction of the field than the lateral direction for both teams, and for both game phases in the first condition. The second condition displayed higher synchronies and more stable patterns in the lateral direction than the longitudinal plane for both teams, and for both game phases. Results suggest: (i) usefulness of hypernetworks in assessing synchronisation of teams at a meso-level; (ii) coaches may consider manipulating these task constraints to develop levels of local synchronies within teams.  相似文献   

A. Collins,R. Halverson: Rethinking education in the age of technology. The digital revolution and schooling in America     

Pedro Hernández-Ramos 《Educational technology research and development : ETR & D》2010,58(5):609-611

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Morningness/eveningness and school performance among Spanish adolescents: Further evidence     

Cristina Escribano  Juan Francisco Díaz-Morales  Pedro Delgado  Ma. José Collado 《Learning and individual differences》2012,22(3):409-413

Adolescents shift their time of day preferences from morning to evening during puberty when school schedule becomes earlier. Given that a better performance is obtained when individuals are tested at times that are in synchrony with their chronotype, and optimal sleep duration is positively associated with academic performance, evening-types may obtain worse school performance because of both morning school schedule and a decrease of total sleep time. A group of 1133 adolescents (aged 12–16) participated in this study. School performance was evaluated using subjective level of achievement and self-reported grades measures. Controlling for total sleep time, more evening oriented young adolescents (12–14 years) performed significantly worse in school achievement. Girls among 15–16 years performed significantly better than boys. These results have important implications for intervention and prevention programs during school years.  相似文献