Repeated exercise stress impairs volitional but not magnetically evoked electromechanical delay of the knee flexors     

Minshull C  Eston R  Bailey A  Rees D  Gleeson N 《Journal of sports sciences》2012,30(2):217-225

The effects of serial episodes of fatigue and recovery on volitional and magnetically evoked neuromuscular performance of the knee flexors were assessed in 20 female soccer players during: (i) an intervention comprising 4 × 35 s maximal static exercise, and (ii) a control condition. Volitional peak force was impaired progressively (-16% vs. baseline: 235.3 ± 54.7 to 198.1 ± 38.5 N) by the fatiguing exercise and recovered to within -97% of baseline values following 6 min of rest. Evoked peak twitch force was diminished subsequent to the fourth episode of exercise (23.3%: 21.4 ± 13.8 vs. 16.4 ± 14.6 N) and remained impaired at this level throughout the recovery. Impairment of volitional electromechanical delay performance following the first episode of exercise (25.5%: 55.3 ± 11.9 vs. 69.5 ± 24.5 ms) contrasted with concurrent improvement (10.0%: 24.5 ± 4.7 vs. 22.1 ± 5.0 ms) in evoked electromechanical delay (P < 0.05), and this increased disparity between evoked and volitional electromechanical delay remained during subsequent periods of intervention and recovery. The fatiguing exercise provoked substantial impairments to volitional strength and volitional electromechanical delay that showed differential patterns of recovery. However, improved evoked electromechanical delay performance might identify a dormant capability for optimal muscle responses during acute stressful exercise and an improved capacity to maintain dynamic joint stability during critical episodes of loading.  相似文献   

Mentoring in black and white: the intricacies of cross‐cultural mentoring     

Juanita Johnson‐Bailey Associate Professor 《Mentoring & Tutoring: Partnership in Learning》2013,21(1):7-21

Cross‐cultural mentoring relationships can be sites of struggle around the issues of race, class and gender. In addition, the mentor/protégé relationship offers micro‐cosmic insight into power relations within western society. The authors of this paper, a black woman associate professor and a white male professor, use the example of their mentoring relationship to illustrate six common issues facing academicians involved in these relationships: (1) trust between mentor and protégé; (2) acknowledged and unacknowledged racism; (3) visibility and risks pertinent to minority faculty; (4) power and paternalism; (5) benefits to mentor and protégé; and (6) the double‐edged sword of ‘otherness’ in the academy. Literature is used for review and critique of mentoring in the academy while offering personal examples to illustrate the complexity and success of a 13‐year mentoring relationship between a duo who began their association as teacher/student.  相似文献   

SPRINGFIELD RULING UPSET     

Judge Bailey Aldrich 《Equity & Excellence in Education》2013,46(4-5):59-64

On January 15, 1965, U.S. District Judge George C. Sweeney ruled that the Springfield, Mass, school board was constitutionally obligated to “eliminate to the fullest extent possible racial concentration in its elementary and junior high schools within the framework of effective educational procedures . . . “’ [See text of ruling in Integrated Education, April‐May, 1965, pp. 44‐46 For background, see Integrated Education, December, 1964‐January, 1965, p. 7.] The school board appealed.  相似文献   

Molecular diffusion analysis of dynamic blood flow and plasma separation driven by self-powered microfluidic devices     

Sung Oh Woo  Myungkeun Oh  Kyle Nietfeld  Bailey Boehler  Yongki Choi 《Biomicrofluidics》2021,15(3)

Integration of microfluidic devices with pressure-driven, self-powered fluid flow propulsion methods has provided a very effective solution for on-chip, droplet blood testing applications. However, precise understanding of the physical process governing fluid dynamics in polydimethylsiloxane (PDMS)-based microfluidic devices remains unclear. Here, we propose a pressure-driven diffusion model using Fick''s law and the ideal gas law, the results of which agree well with the experimental fluid dynamics observed in our vacuum pocket-assisted, self-powered microfluidic devices. Notably, this model enables us to precisely tune the flow rate by adjusting two geometrical parameters of the vacuum pocket. By linking the self-powered fluid flow propulsion method to the sedimentation, we also show that direct plasma separation from a drop of whole blood can be achieved using only a simple construction without the need for external power sources, connectors, or a complex operational procedure. Finally, the potential of the vacuum pocket, along with a removable vacuum battery to be integrated with non-PDMS microfluidic devices to drive and control the fluid flow, is demonstrated.  相似文献   

Validation of a videogrammetry technique for analysing American football helmet kinematics     

Ann Bailey  James Funk  David Lessley  Chris Sherwood  Jeff Crandall  William Neale 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(5):678-700

ABSTRACT

Professional American football games are recorded in digital video with multiple cameras, often at high resolution and high frame rates. The purpose of this study was to evaluate the accuracy of a videogrammetry technique to calculate translational and rotational helmet velocity before, during and after a helmet impact. In total, 10 football impacts were staged in a National Football League (NFL) stadium by propelling helmeted 50th percentile male crash test dummies into each other or the ground at speeds and orientations representative of concussive impacts for NFL players. The tests were recorded by experienced sports film crews to obtain video coverage and quality typically available for NFL games. A videogrammetry procedure was used to track the position and rotation of the helmet throughout the relevant time interval of the head impact. Compared with rigidly mounted retroreflective marker three dimensional (3-D) motion tracking that was concurrently collected in the experiments, videogrammetry accurately calculated changes in translational and rotational velocity of the helmet using high frame rate (two cameras at 240 Hz) video (7% and 15% error, respectively). Low frame rate (2 cameras at 60 Hz) video was adequate for calculating pre-impact translational velocity but not for calculating the translational or rotational velocity change of the helmet during impact.  相似文献   

Failure Modes and Effects Analysis (FMEA) for Cataloging: An Application and Evaluation     

Jennifer Meekhof  Amy B. Bailey 《Cataloging & classification quarterly》2017,55(7-8):493-505

Failure Modes and Effects Analysis (FMEA) is a proactive assessment tool originally created for quality assurance in manufacturing industries. FMEA involves the assignment of rankings for frequency, severity, and detection of errors within a process. Catalogers at ProQuest undertook an innovative project to use FMEA to evaluate MARC record production. This article provides an overview of FMEA for process evaluation and summarizes an application for cataloging. It considers the tool's value for error-proofing in MARC record creation and how FMEA might be applied more effectively in a variable environment.  相似文献   

Faculty/Staff Perceptions of a Standards-Based Exit Portfolio System for Graduate Students     

Tena L. McNamara  Rita L. Bailey 《Innovative Higher Education》2006,31(2):129-141

New standards for certification were recently developed for speech–language pathology graduate training programs by the American Speech-Language-Hearing Association. The new standards are outcomes-based rather than process-based. Using a collective case study approach, this article highlights the perceptions of faculty and staff regarding use of a standards-based exit portfolio system for students in a Speech–Language Pathology graduate program at a medium-sized, public university after two semesters of use.Tena L. McNamara received a B.S. degree in Speech Pathology and Audiology and an M.S. degree in Audiology from Bradley University, and the Doctor of Audiology Degree from the University of Florida. She is now Assistant Professor at Illinois State University. Special interests include soundfield FM systems utilized in classroom settings, auditory processing disorders, electrophysiology, and phonological awareness. Rita L. Bailey is a speech–language pathologist and holds a B.S. and an M.S. in Speech–Language Pathology and an Ed.D. in Special Education, all from Illinois State University. She is an Assistant Professor in the Department of Speech Pathology and Audiology at Illinois State University. Her primary research interests include pediatric dysphagia, service-learning, alternative-augmentative communication methods, and voice. E-mail: tlmcnam@ilstu.edu.  相似文献   

学校与工作的整合——教育及变革中的工作场所   总被引：2，自引：1，他引：2  

Thomas R.Bailey  孟广平 《职业技术教育》2002,23(25):10-12

本文通过对相对工资变化和职业分布数据的分析及案例的研究,认为主导美国的传统教育观念未能有效地为今日市场准备好各种人力资源;而新近对高绩效工作模式和教与学的研究显示,一种将学术教育与职业教育整合的改革,对增强劳动队伍的有效性,提高其“高级的通用能力”起重要作用。其中工作场所和课程的整合不能各自孤立地进行,需纳入重新构建学校和工作场所双方更宽泛的战略之中。  相似文献   

Rationality,Democracy and the Neutral Teacher   总被引：1，自引：0，他引：1  

Charles Bailey 《Cambridge Journal of Education》1971,1(2):68-76

  相似文献   

Diarrhea Management Training in Early Childhood Settings     

Scott D. Winnail  Lynn M. Artz  Brian F. Geiger  Cynthia J. Petri  Rebecca Bailey  J. W. Mason 《Early Childhood Education Journal》2001,28(4):231-236

This study addresses the health of young children and how to safely and effectively care for children with diarrhea in the home and in early child care settings. A baseline survey showed the prevalence of oral rehydration solution (ORS) usage at last diarrhea bout to be low. An educational workshop was developed to train parents and child care professionals on how to properly manage young children with diarrhea and reduce the risk of diarrhea spread at home and in early childhood settings. Specific intervention activities are discussed and program activities, including specially designed materials for mixing homemade ORS are described. A comparison of pre- and postintervention data indicates substantial gains in knowledge among both urban and rural populations. Implications of research findings are discussed along with suggestions for future research.  相似文献