Sand training: Exercise-induced muscle damage and inflammatory responses to matched-intensity exercise     

Henry Brown  Brian Dawson  Martyn J. Binnie  Hugh Pinnington  Marc Sim  Tristan D. Clemons 《European Journal of Sport Science》2017,17(6):741-747

This study compared markers of muscle damage and inflammation elevated by a matched-intensity interval running session on soft sand and grass surfaces. In a counterbalanced, repeated-measures and crossover design, 10 well-trained female athletes completed 2 interval-based running sessions 1 week apart on either a grass or a sand surface. Exercise heart rate (HR) was fixed at 83–88% of HR maximum. Venous blood samples were collected pre-, post- and 24?h post-exercise, and analysed for myoglobin (Mb) and C-reactive protein (CRP). Perceptual ratings of exertion (RPE) and muscle soreness (DOMS) were recorded immediately post- and 24?h post-exercise. A significant time effect showed that Mb increased from pre- to post-exercise on grass (p?=?.008) but not on sand (p?=?.611). Furthermore, there was a greater relative increase in Mb on grass compared with that on sand (p?=?.026). No differences in CRP were reported between surfaces (p?>?.05). The HR, RPE and DOMS scores were not significantly different between conditions (p > .05). These results suggest that in response to a matched-intensity exercise bout, markers of post-exercise muscle damage may be reduced by running on softer ground surfaces. Such training strategy may be used to minimize musculoskeletal strain while still incurring an equivalent cardiovascular training stimulus.  相似文献   

There's more to french immersion than social class     

Mary Alice Julius Guttman 《Interchange》1983,14(1):17-22

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Heaviside's operators in engineering and physics     

Ernst Julius Berg 《Journal of The Franklin Institute》1924,198(5):647-702

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A dialogic about using Facebook status updates for education research: a PhD student's journey     

Naomi Barnes  Sorrel Penn-Edwards  Cheryl Sim 《Educational Research and Evaluation》2015,21(2):109-121

Facebook status updates provided the data for a study about the transition learning experiences of 1st-year university students. Strict ethical guidelines were proposed by the PhD researcher from the outset of the study. Anonymity was considered important for the approved ethical clearance for both the university and the participants. Phenomenography was adopted and adapted for the study because it both conceptually and methodologically managed anonymity as well as questions of authenticity. An ethical dilemma arose during the research because the archival parameters were expanded by the researcher to allow the collection of data from the participants’ network. Questions of consent in an online space and how to report findings, which included data from people unaware of their involvement in the research, needed to be considered.  相似文献   

Teachers of learners with ASD in mainstream schools and classrooms in Spain: attitudes towards inclusive education     

Yolanda Muñoz Martínez  Cecilia Simón Rueda  Mª José de Dios Pérez 《British Journal of Special Education》2023,50(1):104-126

This study analyses the attitudes of teachers in Spain towards the inclusion of learners with autism spectrum disorder in mainstream education settings and their relationship with the perceived benefits of inclusion. The ex post facto prospective design included 180 teachers from 14 schools. Data were collected using a questionnaire on teachers' attitudes towards inclusive education and a second questionnaire on the benefits of inclusion developed for the specific purposes of this study. The results show teachers' positive attitudes towards inclusion as well as the benefits perceived. This study demonstrates the fundamental role of teachers' previous experience. Implications for inclusive cultures and practices in schools are discussed.  相似文献   

Scientific policy in the Netherlands     

H. W. Julius 《Minerva》1967,5(4):507-519

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The preparation of pure alloys     

Ernst Julius Berg 《Journal of The Franklin Institute》1924,198(6):794

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Novel model reference adaptive control laws for improved transient dynamics and guaranteed saturation constraints     

Robert B. Anderson  Julius A. Marshall  Andrea L’Afflitto 《Journal of The Franklin Institute》2021,358(12):6281-6308

In classical model reference adaptive control (MRAC), the adaptive rates must be tuned to meet multiple competing objectives. Large adaptive rates guarantee rapid convergence of the trajectory tracking error to zero. However, large adaptive rates may also induce saturation of the actuators and excessive overshoots of the closed-loop system’s trajectory tracking error. Conversely, low adaptive rates may produce unsatisfactory trajectory tracking performances. To overcome these limitations, in the classical MRAC framework, the adaptive rates must be tuned through an iterative process. Alternative approaches require to modify the plant’s reference model or the reference command input. This paper presents the first MRAC laws for nonlinear dynamical systems affected by matched and parametric uncertainties that constrain both the closed-loop system’s trajectory tracking error and the control input at all times within user-defined bounds, and enforce a user-defined rate of convergence on the trajectory tracking error. By applying the proposed MRAC laws, the adaptive rates can be set arbitrarily large and both the plant’s reference model and the reference command input can be chosen arbitrarily. The user-defined rate of convergence of the closed-loop plant’s trajectory is enforced by introducing a user-defined auxiliary reference model, which converges to the trajectory tracking error obtained by applying the classical MRAC laws before its transient dynamics has decayed, and steering the trajectory tracking error to the auxiliary reference model at a rate of convergence that is higher than the rate of convergence of the plant’s reference model. The ability of the proposed MRAC laws to prescribe the performance of the closed-loop system’s trajectory tracking error and control input is guaranteed by barrier Lyapunov functions. Numerical simulations illustrate both the applicability of our theoretical results and their effectiveness compared to other techniques such as prescribed performance control, which allows to constrain both the rate of convergence and the maximum overshoot on the trajectory tracking error of uncertain systems.  相似文献   

A SEARCH FOR IDENTITY     

Julius Hobson 《Equity & Excellence in Education》2013,46(2):23-27

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Community College Developmental Writing Programs Most Promising Practices: What the Research Tells Educators     

Sim Barhoum 《Community College Journal of Research & Practice》2013,37(12):791-808

ABSTRACT

Students at community colleges are being placed into developmental writing classes at significantly high rates, as high as 80% at some colleges. Many of these students are students of color, and the need to help them persist and succeed is of increasing importance. The purpose of this study was to investigate the most promising practices by community college developmental writing programs. This article presents a review of more than 245 publications from over 450 authors, synthesized down to 36 validated studies with the goal of informing scholars and practitioners of the current state of the field. Themes emerging from these studies and a conceptual model through which findings can be viewed are presented. The analysis, with a focus on the structural, curricular, andragogical, and relational domains, documents only validated studies about the most promising practices. This article supports, challenges, and recommends how to better serve students in the developmental writing context. This author hopes to change how colleges implement developmental writing practices so that practitioners will be given the best tools to help all students succeed.  相似文献