Dullbusters part 2: “Sure shot” methods for creating excitement     

Joel Gendelman 《Performance Improvement》1993,32(2):40-40

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Longer-term effects of minimalist shoes on running performance,strength and bone density: A 20-week follow-up study*     

Joel T. Fuller  Dominic Thewlis  Margarita D. Tsiros  Nicholas A. T. Brown  Joseph Hamill  Jonathan D. Buckley 《European Journal of Sport Science》2019,19(3):402-412

This study investigated whether male runners improve running performance, running economy, ankle plantar flexor strength, and alter running biomechanics and lower limb bone mineral density when gradually transitioning to using minimalist shoes for 100% of weekly running. The study was a planned follow-up of runners (n?=?50) who transitioned to minimalist or conventional shoes for 35% of weekly structured training in a previous 6-week randomised controlled trial. In that trial, running performance and economy improved more with minimalist shoes than conventional shoes. Runners in each group were instructed to continue running in their allocated shoe during their own preferred training programme for a further 20 weeks while increasing allocated shoe use to 100% of weekly training. At the 20-week follow-up, minimalist shoes did not affect performance (effect size: 0.19; p?=?0.218), running economy (effect size: ≤?0.24; p?≥?0.388), stride rate or length (effect size: ≤?0.12; p?≥?0.550), foot strike (effect size: ≤?0.25; p?≥?0.366), or bone mineral density (effect size: ≤?0.40; p?≥?0.319). Minimalist shoes increased plantar flexor strength more than conventional shoes when runners trained with greater mean weekly training distances (shoe*distance interaction: p?=?0.036). After greater improvements with minimalist shoes during the initial six weeks of a structured training programme, increasing minimalist shoe use from 35% to 100% over 20 weeks, when runners use their own preferred training programme, did not further improve performance, running economy or alter running biomechanics and lower limb bone mineral density. Minimalist shoes improved plantar flexor strength more than conventional shoes in runners with greater weekly training distances.  相似文献   

Acute effects of static stretching on characteristics of the isokinetic angle - torque relationship, surface electromyography, and mechanomyography     

Cramer JT  Beck TW  Housh TJ  Massey LL  Marek SM  Danglemeier S  Purkayastha S  Culbertson JY  Fitz KA  Egan AD 《Journal of sports sciences》2007,25(6):687-698

The aims of this study were to examine the acute effects of static stretching on peak torque, work, the joint angle at peak torque, acceleration time, isokinetic range of motion, mechanomyographic amplitude, and electromyographic amplitude of the rectus femoris during maximal concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1) in men and women. Ten women (mean +/- s: age 23.0 +/- 2.9 years, stature 1.61 +/- 0.12 m, mass 63.3 +/- 9.9 kg) and eight men (age 21.4 +/- 3.0 years, stature 1.83 +/- 0.11 m, mass 83.1 +/- 15.2 kg) performed maximal voluntary concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1). Following the initial isokinetic tests, the dominant leg extensors were stretched using four static stretching exercises. After the stretching, the isokinetic tests were repeated. Peak torque, acceleration time, and electromyographic amplitude decreased (P< or = 0.05) from pre- to post-stretching at 1.04 and 5.23 rad . s(-1); there were no changes (P > 0.05) in work, joint angle at peak torque, isokinetic range of motion, or mechanomyographic amplitude. These findings indicate no stretching-related changes in the area under the angle - torque curve (work), but a significant decrease in peak torque, which suggests that static stretching may cause a "flattening" of the angle - torque curve that reduces peak strength but allows for greater force production at other joint angles. These findings, in conjunction with the increased limb acceleration rates (decreased acceleration time) observed in the present study, provide tentative support for the hypothesis that static stretching alters the angle - torque relationship and/or sarcomere shortening velocity.  相似文献   

Facilitating vocabulary inferring through root-word instruction     

Joel R. Levin  Russell N. Carney  Michael Pressley 《Contemporary educational psychology》1988,13(4)

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Examining the effects of a highly rated science curriculum unit on diverse students: Results from a planning grant     

Sharon Lynch  Joel Kuipers  Curtis Pyke  Michael Szesze 《科学教学研究杂志》2005,42(8):912-946

This article reports on the results of a planning grant studying the effects of a highly rated curriculum unit on a diverse student population. The treatment was introduced to 1500 eighth grade students in five middle schools selected for their ethnic, linguistic, and socioeconomic diversity. Students were given pre‐, post‐, and delayed posttests on a Conservation of Matter Assessment and measures of motivation and engagement. This quasi‐experiment found statistically significant posttest results for achievement, basic learning engagement, and goal orientation. Analyses of disaggregated data showed that subgroups of students in the treatment condition outscored their comparison group peers (n = 1500) in achievement in all cases, except for students currently enrolled in ESOL. Analysis of video data of a diverse group of four students as the unit was enacted suggests that students entered a learning environment that permitted them to function in different, but consistent ways over time; that is, the frequency of students' manipulation of objects showed a different pattern of engagement for each of the four students compared with patterns of verbal responses such as the use of scientific terms. The results of this planning grant paved the way for a large study of the scale‐up of highly rated curriculum units. © 2005 Wiley Periodicals, Inc. J Res Sci Teach 42: 912–946, 2005  相似文献   

地质科技期刊中的几个错例   总被引：1，自引：0，他引：1  

李杰美 《编辑学报》2001,13(4):211-212

地质科学包容了数理化天地生各学科，因此在地质科技期刊中常见错误涉及的范围较宽。有些是沿用传统用法，有些是编辑欠缺知识所致，而多数则属于不规范、不标准的范畴。  相似文献   

Can High School Achievement Tests Serve to Select College Students?     

Adriana D. Cimetta  Jerome V. D'Agostino  Joel R. Levin 《Educational Measurement》2010,29(2):3-12

Postsecondary schools have traditionally relied on admissions tests such as the SAT and ACT to select students. With high school achievement assessments in place in many states, it is important to ascertain whether scores from those exams can either supplement or supplant conventional admissions tests. In this study we examined whether the Arizona Instrument to Measure Standards (AIMS) high school tests could serve as a useful predictor of college performance. Stepwise regression analyses with a predetermined order of variable entry revealed that AIMS generally did not account for additional performance variation when added to high school grade-point average (HSGPA) and SAT. However, in a cohort of students that took the test for graduation purposes, AIMS did account for about the same proportion of variance as SAT when added to a model that included HSGPA. The predictive value of both SAT and AIMS was generally the same for Caucasian, Hispanic, and Asian American students. The ramifications of universities using high school achievement exams as predictors of college success, in addition to or in lieu of traditional measures, are discussed.  相似文献   

Revans reversed: focusing on the positive for a change     

Jeffrey Gold 《Action Learning: Research and Practice》2014,11(3):264-277

The classical principles of action learning, based on the work of Revans, usually include working with problems as the core. This article aims, by contrast, to show how a recent project of change has incorporated principles of appreciative inquiry (AI) based on social constructionism and positive psychology into an action learning process involving a wide range of participants. The concern for problems is considered showing that the process of diagnosing a problem can reinforce a deficit orientation. The key ideas of AI are presented, highlighting the purpose of finding out what is going on in terms of what is working well, and in doing so, it becomes possible to build a picture of the strengths and virtues of what is happening at work. Based on findings from a recent project of culture shift in a design and production company, a process of positive action learning is considered.  相似文献   

Book reviews     

Joel H. Wiener  Pamela K. Gilbert  J. James Mancuso  Gustavo Verdesio  J. Kendrick Noble  David A. Kronick  Thomas L. Boon  John Tebbel  Sally P. Bennett  J. James Mancuso  Gretchen V. Douglas  Richard W. Clement  Nat Bodian 《Publishing Research Quarterly》1996,12(2):64-86

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The Routledge companion to reinventing management education     

Jeff Gold 《Action Learning: Research and Practice》2017,14(3):288-292

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