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The purpose of this study was to examine changes in landing performance during fatigue that could result in increased stress fracture injury risk. Five participants performed nonfatigued and fatigued drop landings (0.60 m), while ground reaction force (GRF), electromyographic (EMG) activity, and kinematics were recorded. Fatigue was defined as a 5-20% reduction in vertical jumping performance. Single-subject analyses revealed that all participants were affected (p < or = .05) by fatigue. Post hoc comparisons revealed a group effect (p < or = .05) for selected variables. Participants landed with (a) less joint flexion at contact and used a greater range of motion, (b) greater GRF peaks and loading rates, and (c) less EMG activity. These changes were consistent with greater risk of stress fracture. 相似文献
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Roger F. Bass 《Psychology in the schools》1987,24(2):97-104
Arguments concerning the generality and statistical analysis of single-subject data are evaluated. Consideration is also given to the role that philosophy of science can play in evaluating research methodology. From this background, single-subject data emerge as a unique phenomenon with special relevance for psychologists and educators who focus on the individual. Statistical techniques for analyzing an individual's data are found to have numerous limitations. Furthermore, critiques of visual analysis yield analogous arguments against inferential statistics. Philosophy of science has proven a poor touchstone for evaluating scientific methodology. Instead, it is best at placing philosophical foundations under already constructed methods and theories. 相似文献
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Planning looks to the future. It can have several different intentions and frames of reference; (a) to pursue more economical ways and means to implement courses, activities, and jobs based on accepted purposes; (b) to seek ways to increase the efficiency of an entire educational system, including all of its parts (such as a curriculum, a school, a school system, or a state); and (c) to search for, and possibly create, a new and improved future set of realities and consequences. The first two approaches are basically concerned with increasing efficiency in reaching established goals. The third is holistic in intending to both improve current efficiency and help to create a better future. This article (a) identifies and defines these three major distinct (yet related) planning modes, and (b) discusses one educational research and development effort which intends to integrate them. 相似文献
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The first two editions of the Handbook of Human Performance Technology helped define the rapidly growing and vibrant field of human performance technology—a systematic approach to improving individual and organizational performance. Exhaustively researched and edited by Dr. James A. Pershing, CPT, this third edition not only updates key foundational chapters on organizational change, evaluation, instructional design, and motivation, but features breakthrough chapters on “performance technology in action” and addresses many new topics in the field, such as certification, Six Sigma, and communities of practice. In this chapter, reprinted with permission of John Wiley & Sons, Inc. (copyright 2006), Roger Addison and Carol Haig take you on a journey through the key elements of a full performance process with its pitfalls and how to avoid them. 相似文献
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