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71.
Glenn S. Fleisig Walter A. Laughlin Kyle T. Aune E. Lyle Cain Jeffrey R. Dugas James R. Andrews 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):128-138
Controversy continues whether curveballs are stressful for young baseball pitchers. Furthermore, it is unproven whether professional baseball pitchers have fewer kinematic differences between fastballs and off-speed pitches than lower level pitchers. Kinematic and kinetic data were measured for 111 healthy baseball pitchers (26 youth, 21 high school, 20 collegiate, 26 minor league, and 18 major league level) throwing fastballs, curveballs, and change-ups in an indoor biomechanics laboratory with a high-speed, automated digitising system. Differences between pitch types and between competition levels were analysed with repeated measures ANOVA. Shoulder and elbow kinetics were greater in fastballs than in change-ups, while curveball kinetics were not different from the other two types of pitches. Kinematic angles at the instant of ball release varied between pitch types, while kinematic angles at the instant of lead foot contact varied between competition levels. There were no significant interactions between pitch type and competition level, meaning that kinetic and kinematic differences between pitch types did not vary by competition level. Like previous investigations, this study did not support the theory that curveballs are relatively more stressful for young pitchers. Although pitchers desire consistent kinematics, there were differences between pitch types, independent of competition level. 相似文献
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Glenn G. Smith Allen J. Heindel Ana T. Torres-Ayala 《The Internet and Higher Education》2008,11(3-4):152
Differences in curriculum and teaching styles across disciplines in higher education courses are also evident in online courses. This study used two widely available sources of data, CMS tool usage logs and course evaluations, to analyze differences between online courses in disciplinary quadrants (hard-pure, hard-applied, soft-pure, soft-applied) at a large metropolitan university, over five years (2002 and 2007). For 2007, results revealed significant differences in tool usage between disciplines, particularly for assessment tools. Hard-pure courses used Tests and Pool tools more often than did soft-pure courses. The Document tool was used most extensively in applied courses. Data from course evaluations, for spring 2007 online courses, suggested that applied disciplines had a shorter learner–instructor transactional distance than did pure disciplines. Results suggest that over five years, e-learning in pure disciplines has become more commoditized, while e-learning in applied disciplines has become more diversified and more oriented to community practice. 相似文献
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This article examines the methodology undertaken while investigating whether existing materials pertaining to Asian American Studies at The Pennsylvania State University Libraries could support a new academic program. Presently active academic subareas in the field of Asian American Studies were determined. Then existing collections of thirteen “benchmark” universities were examined according to these subareas and compared to the holdings of Pennsylvania State University Libraries. This method can evaluate the fitness of existing collections to new academic demands and serve as a tool for collection development by identifying present and future areas of academic study. 相似文献
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A new residential college and a faculty-in-residence program demonstrate how student affairs educators and academic faculty at one institution have collaborated to create transformational learning experiences for their students. 相似文献