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Isauro M. Escamilla 《Studying Teacher Education》2018,14(1):3-21
In this article, a preschool teacher and an early childhood teacher educator describe and analyze their work co-creating and co-facilitating an early childhood inquiry group over seven years. The group consisted of veteran lead teachers, assistant teachers, instructional coaches, and an outside teacher educator at an urban, public preschool in San Francisco, California. Using the framework of narrative inquiry and portraiture, the article tells the story of the group’s formation, its structure, and its benefits for the participants’ personal and professional growth. The authors argue that an inquiry group is a highly viable, home-grown form of professional growth that relies on the group as a forum for self-study and reflection. The inquiry group provided the teachers with an increased understanding of child development and instructional strategies, a trusting public forum for sharing and validating their inquiry and teaching, and a communal opportunity to make visible the voices of teachers, children, and families. 相似文献
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Rafael Escamilla Glen Fleisig Steven Barrentine James Andrews Claude Moorman III 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):213-228
The purpose of this study was to quantify and compare kinematic, temporal, and kinetic characteristics of American and Korean professional pitchers in order to investigate differences in pitching mechanics, performance, and injury risks among two different cultures and populations of baseball pitchers. Eleven American and eight Korean healthy professional baseball pitchers threw multiple fastball pitches off an indoor throwing mound positioned at regulation distance from home plate. A Motion Analysis three‐dimensional automatic digitizing system was used to collect 200 Hz video data from four electronically synchronized cameras. Twenty kinematic, six temporal, and 11 kinetic variables were analyzed at lead foot contact, during the arm cocking and arm acceleration phases, at ball release, and during the arm deceleration phase. A radar gun was used to quantify ball velocity. At lead foot contact, the American pitchers had significantly greater horizontal abduction of the throwing shoulder, while Korean pitchers exhibited significantly greater abduction and external rotation of the throwing shoulder. During arm cocking, the American pitchers displayed significantly greater maximum shoulder external rotation and maximum pelvis angular velocity. At the instant of ball release, the American pitchers had significantly greater forward trunk tilt and ball velocity and significantly less knee flexion, which help explain why the American pitchers had 10% greater ball velocity compared to the Korean pitchers. The American pitchers had significantly greater maximum shoulder internal rotation torque and maximum elbow varus torque during arm cocking, significantly greater elbow flexion torque during arm acceleration, and significantly greater shoulder and elbow proximal forces during arm deceleration. While greater shoulder and elbow forces and torques generated in the American pitchers helped generate greater ball velocity for the American group, these greater kinetics may predispose this group to a higher risk of shoulder and elbow injuries. 相似文献
3.
Sandra A. Butvilofsky Susan Hopewell Kathy Escamilla Wendy Sparrow 《Journal of Latinos & Education》2017,16(2):85-97
The purpose of this single-subject longitudinal study was to examine the Spanish and English biliterate development of U.S. Latino Spanish/English speaking students, who we call emerging bilingual students, as they participated in an innovative biliteracy instructional program titled Literacy Squared®. Findings indicate that across the three years of the study, participating students made gains in Spanish and English reading and writing. This study provides support for Literacy Squared as an innovative biliterate program. Further, the study provides evidence for the need to consider alternative methods to document Latino Spanish/English students’ biliteracy development such as through the use of biliterate trajectories. 相似文献
4.
Rafael F. Escamilla Glenn S. Fleisig Nigel Zheng Steven W. Barrentine James R. Andrews 《Journal of sports sciences》2013,31(9):665-676
The aim of this study was to compare and evaluate the kinematics of baseball pitchers who participated in the 1996 XXVI Centennial Olympic Games. Two synchronized video cameras operating at 120 Hz were used to video 48 pitchers from Australia, Japan, the Netherlands, Cuba, Italy, Korea, Nicaragua and the USA. All pitchers were analysed while throwing the fastball pitch. Twenty-one kinematic parameters were measured at lead foot contact, during the arm cocking and arm acceleration phases, and at the instant of ball release. These parameters included stride length, foot angle and foot placement; shoulder abduction, shoulder horizontal adduction and shoulder external rotation; knee and elbow flexion; upper torso, shoulder internal rotation and elbow extension angular velocities; forward and lateral trunk tilt; and ball speed. A one-way analysis of variance (P ? 0.01) was used to assess kinematic differences. Shoulder horizontal adduction and shoulder external rotation at lead foot contact and ball speed at the instant of ball release were significantly different among countries. The greater shoulder horizontal abduction observed in Cuban pitchers at lead foot contact is thought to be an important factor in the generation of force throughout the arm cocking and arm acceleration phases, and may in part explain why Cuban pitchers generated the greatest ball release speed. We conclude that pitching kinematics are similar among baseball pitchers from different countries. 相似文献
5.
Kinematic comparisons of 1996 Olympic baseball pitchers 总被引：1，自引：0，他引：1
Escamilla RF Fleisig GS Zheng N Barrentine SW Andrews JR 《Journal of sports sciences》2001,19(9):665-676
The aim of this study was to compare and evaluate the kinematics of baseball pitchers who participated in the 1996 XXVI Centennial Olympic Games. Two synchronized video cameras operating at 120 Hz were used to video 48 pitchers from Australia, Japan, the Netherlands, Cuba, Italy, Korea, Nicaragua and the USA. All pitchers were analysed while throwing the fastball pitch. Twenty-one kinematic parameters were measured at lead foot contact, during the arm cocking and arm acceleration phases, and at the instant of ball release. These parameters included stride length, foot angle and foot placement; shoulder abduction, shoulder horizontal adduction and shoulder external rotation; knee and elbow flexion; upper torso, shoulder internal rotation and elbow extension angular velocities; forward and lateral trunk tilt; and ball speed. A one-way analysis of variance (P < 0.01) was used to assess kinematic differences. Shoulder horizontal adduction and shoulder external rotation at lead foot contact and ball speed at the instant of ball release were significantly different among countries. The greater shoulder horizontal abduction observed in Cuban pitchers at lead foot contact is thought to be an important factor in the generation of force throughout the arm cocking and arm acceleration phases, and may in part explain why Cuban pitchers generated the greatest ball release speed. We conclude that pitching kinematics are similar among baseball pitchers from different countries. 相似文献
6.
Fleisig G Nicholls R Elliott B Escamilla R 《Sports biomechanics / International Society of Biomechanics in Sports》2003,2(1):51-64
The purpose of this study was to quantify ranges and speeds of movement, from shoulder external rotation to ball impact, in the tennis service actions of world class players. Two electronically synchronised 200 Hz video cameras were used to record 20 tennis players during singles competition at the Sydney 2000 Olympic games. Three-dimensional motion of 20 landmarks on each player and racquet were manually digitized. Based upon the mean values for this group, the elbow flexed to 104 degrees and the upper arm rotated into 172 degrees of shoulder external rotation as the front knee extended. From this cocked position, there was a rapid sequence of segment rotations. The order of maximum angular velocities was trunk tilt (280 degrees/s), upper torso rotation (870 degrees/s), pelvis rotation (440 degrees/s), elbow extension (1510 degrees/s), wrist flexion (1950 degrees/s), and shoulder internal rotation. Shoulder internal rotation was greater for males (2420 degrees/s) than females (1370 degrees/s), which may be related to the faster ball velocity produced by the males (50.8 m/s) than the females (41.5 m/s). Although both genders produced segment rotations in the same order, maximum upper torso velocity occurred earlier for females (0.075 s before impact) than for males (0.058 s). At impact, the trunk was tilted 48 degrees above horizontal, the arm was abducted 101 degrees and the elbow, wrist, and lead knee were slightly flexed. Male and female players should be trained to develop the kinematics measured in this study in order to produce effective high-velocity serves. 相似文献
7.
Escamilla R Fleisig G Barrentine S Andrews J Moorman C 《Sports biomechanics / International Society of Biomechanics in Sports》2002,1(2):213-228
The purpose of this study was to quantify and compare kinematic, temporal, and kinetic characteristics of American and Korean professional pitchers in order to investigate differences in pitching mechanics, performance, and injury risks among two different cultures and populations of baseball pitchers. Eleven American and eight Korean healthy professional baseball pitchers threw multiple fastball pitches off an indoor throwing mound positioned at regulation distance from home plate. A Motion Analysis three-dimensional automatic digitizing system was used to collect 200 Hz video data from four electronically synchronized cameras. Twenty kinematic, six temporal, and 11 kinetic variables were analyzed at lead foot contact, during the arm cocking and arm acceleration phases, at ball release, and during the arm deceleration phase. A radar gun was used to quantify ball velocity. At lead foot contact, the American pitchers had significantly greater horizontal abduction of the throwing shoulder, while Korean pitchers exhibited significantly greater abduction and external rotation of the throwing shoulder. During arm cocking, the American pitchers displayed significantly greater maximum shoulder external rotation and maximum pelvis angular velocity. At the instant of ball release, the American pitchers had significantly greater forward trunk tilt and ball velocity and significantly less knee flexion, which help explain why the American pitchers had 10% greater ball velocity compared to the Korean pitchers. The American pitchers had significantly greater maximum shoulder internal rotation torque and maximum elbow varus torque during arm cocking, significantly greater elbow flexion torque during arm acceleration, and significantly greater shoulder and elbow proximal forces during arm deceleration. While greater shoulder and elbow forces and torques generated in the American pitchers helped generate greater ball velocity for the American group, these greater kinetics may predispose this group to a higher risk of shoulder and elbow injuries. 相似文献
8.
The lack of educational success among Latinos has been the focus of much research concerned with identifying factors contributing
to school failure. However, some Latinos do achieve educational success and receive college degrees. Their lives can serve
as case studies of minority educational success. This study used autobiographical and interview data to construct the life
histories of two Chicanos in order to examine their interpretations of their educational experiences and the sociocultural
factors which they identified as influencing those experiences. An additional purpose was to provide detailed biographical
information which is currently not available on educationally successful Chicanos. A biographical perspective provides a counterbalance
to perceptions of the role of sociocultural factors such as ethnicity in the education of minorities which view them as static
or unproblematic. When examined within the contexts of lives that undergo transitions across biographical time, the influence
of sociocultural factors such as ethnicity is shown to vary and to require an examination of their impact that shifts across
educational careers.
His research interests include examining relatiponships between literacy, cullure, and socialization in written and oral genres,
including the life histories of Chicano educators. He holds a Ph.D. in language and literacy from The Ohio State University
Her research and teaching interests focus on bilingual education in Spanish and English. She holds a Ph.D. in curriculum and
the study of schooling from UCLA. 相似文献
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Okoye Kingsley Arrona-Palacios Arturo Camacho-Zuñiga Claudia Achem Joaquín Alejandro Guerra Escamilla Jose Hosseini Samira 《Education and Information Technologies》2022,27(3):3891-3933
Education and Information Technologies - Recent trends in educational technology have led to emergence of methods such as teaching analytics (TA) in understanding and management of the... 相似文献
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