A physiological and biomechanical comparison of over-ground,treadmill and ergometer wheelchair propulsion     

Barry Mason  John Lenton  Christof Leicht  Victoria Goosey-Tolfrey 《Journal of sports sciences》2013,31(1):78-91

Abstract

The purpose of the study was to determine which laboratory-based modality provides the most valid physiological and biomechanical representation of over-ground sports wheelchair propulsion. Fifteen able-bodied participants with previous experience of wheelchair propulsion performed a 3-minute exercise trial at three speeds (4, 6 and 8 km ? h^–1) in three testing modalities over separate sessions: (i) over-ground propulsion on a wooden sprung surface; (ii) wheelchair ergometer propulsion; (iii) treadmill propulsion at four different gradients (0%, 0.7%, 1.0% and 1,3%). A 0.7% treadmill gradient was shown to best reflect the oxygen uptake (7.3 to 9.1% coefficient of variation (CV)) and heart rate responses (4.9 to 6.4% CV) of over-ground propulsion at 4 and 6 km ? h^–1. A 1.0% treadmill gradient provided a more valid representation of oxygen uptake during over-ground propulsion at 8 km ? h^–1 (8.6% CV). Physiological demand was significantly underestimated in the 0% gradient and overestimated in the 1.3% gradient and wheelchair ergometer trials compared to over-ground trials (P<0.05). No laboratory-based modality provided a valid representation of the forces applied during OG (≥ 18.4% CV). To conclude, a 0.7% treadmill gradient is recommended to replicate over-ground wheelchair propulsion at lower speeds (4 and 6 km ? h^–1) whereas a 1.0% gradient may be more suitable at 8 km ? h^–1.  相似文献   

Neonatal Stress Reactivity: Predictions to Later Emotional Temperament   总被引：1，自引：0，他引：1  

Megan R. Gunnar  Fran L. Porter  Cynthia M. Wolf  Joseph Rigatuso  Mary C. Larson 《Child development》1995,66(1):1-13

To investigate the relations among popular measures of neonatal stress and their link to subsequent temperament, 50 full-term newborns from a normal care nursery were examined responding to a heelstick blood draw. Baseline and heelstick measures of behavioral state, heart period, vagal tone, and salivary cortisol were obtained. Recovery measures of behavioral and cardiac activity were also analyzed. Mothers completed Rothbart's Infant Behavior Questionnaire when their infants reached 6 months of age. Baseline vagal tone predicted cortisol in response to the heelstick, suggesting that baseline vagal tone reflects the infants' ability to react to stressors. Greater reactivity to the heelstick (more crying, shorter heart periods, lower vagal tone, and higher cortisol) was associated with lower scores on "Distress-to-Limitations" temperament at 6 months. This finding was consistent with the expectation that the capacity to react strongly to an aversive stimulus would reflect better neurobehavioral organization in the newborn. Recovery measures of cardiac activity approximated and were correlated with baseline measures indicating the strong self-righting properties of the healthy newborn. Finally, vagal tone and salivary cortisol measures were not significantly related, suggesting the importance of assessing both systems in studies of the ontogeny of stress-temperament relations.  相似文献   

Identifying the training experiences and needs of bilingual school psychologists     

Desire Vega  Jaclyn N. Wolf  Dylan O. Barton  Michele Stathatos  Charlotte Iurino  Lily Hammer 《Psychology in the schools》2019,56(10):1687-1699

The purpose of this pilot study was to better understand the training experiences of bilingual school psychologists (BSPs) and identify their training needs in the provision of psychological services to English language learner students. The secondary aims of the study were to determine how school psychology programs can better prepare BSPs and incorporate best practices in bilingual competencies into their training models. Six BSPs (Spanish/English‐speakers) participated in the study; findings revealed four themes related to their training experiences: (a) programmatic limitations, (b) assumption that language equals competence, (c) going beyond the classroom, and (d) experiential training. In addition, as a result of their training experiences, the BSPs provided training recommendations in two major areas: (a) trainers and (b) culturally relevant curriculum. Implications for school psychology trainers will be provided.  相似文献   

Health education for Somali Bantu refugees via home visits   总被引：1，自引：1，他引：0  

Eisenhauer ER  Mosher EC  Lamson KS  Wolf HA  Schwartz DG 《Health information and libraries journal》2012,29(2):152-161

Background: Somali Bantu refugees, with unique health information needs, created challenges for health and social service providers. Objectives: A service innovation was developed (i) to raise awareness, especially among local health and social service providers, about the Bantu refugees’ presence in the community, their culture, and their information needs and (ii) to deliver needed health information, emphasizing child health, to the Bantu mothers in their homes. Methods: The project consisted of: (i) a community conference targeting local health and social service providers, describing the refugees’ presence in the community, their culture, and information needs. (ii) Focus groups conducted with members of the Bantu population elicited additional information needs. (iii) Curriculum was developed based on identified needs, and (iv) the curriculum was delivered to the refugees in their homes. A clinical informationist and MP3 technology enhanced the project. Findings: Conference attendees’ evaluation responses indicated improved understanding of Bantu culture. Focus groups’ identification of health information needs provided a framework for the health education curriculum. A project website made educational materials available to other healthcare providers. Conclusions: The project raised awareness of the Bantus’ presence, culture, and information needs. Identification of other unmet needs demonstrated that additional support for refugees is required.  相似文献   

The dark side of social support: Understanding the role of social support,drinking behaviors and alcohol outlets for child physical abuse     

Bridget Freisthler  Megan R. Holmes  Jennifer Price Wolf 《Child abuse & neglect》2014

The purpose of this study is to examine how parental drinking behavior, drinking locations, alcohol outlet density, and types of social support (tangible, emotional, and social companionship) may place children at greater risk for physical abuse. Data on use of physical abuse, drinking behaviors, types of social support, social networks, and demographic information were collected via telephone interviews with 3,023 parent respondents in 50 cities in California. Data on alcohol outlet density were obtained by the California Department of Alcoholic Beverage Control. Multilevel Poisson models were used to analyze data for the drinking levels in the entire sample and dose-response drinking models for drinkers. Social companionship support was related to more frequent use of physical abuse. Having a higher percentage of social companionship support network living within the neighborhood was related to more frequent physical abuse in the full sample. This relationship was moderated by on-premise alcohol outlet density. With regards to drinking behaviors, drinking behaviors from ex-drinkers to frequent heavy drinkers used physically abusive parenting practices more often than lifetime abstainers. The dose-response models show that each additional drinking event at a bar or home/party was related to more frequent use of physical abuse. Practitioners working with parents who abuse their children should be aware that not all social support is beneficial. Findings build evidence that child maltreatment is influenced by the interaction between individual and ecological factors.  相似文献   

A rules‐based study of television's role in the construction of social reality     

Michelle A. Wolf  Timothy P. Meyer  Christopher White 《广播与电子媒介杂志》2013,57(4):813-829

A qualitative analysis of one couple's conversational uses of mediated content is presented. Observations spanned a two‐year period. Data were categorized according to usage type and then examined from Lull's (1981) rules persective.  相似文献   

Presenting theoretical ideas prior to inquiry activities fosters theory‐level knowledge     

Christof Wecker  Alexander Rachel  Eva Heran‐Dörr  Christine Waltner  Hartmut Wiesner  Frank Fischer 《科学教学研究杂志》2013,50(10):1180-1206

  相似文献   

Parent and Student Voices on the First Year of the DC Opportunity Scholarship Program     

Thomas Stewart  Patrick J. Wolf  Stephen Q. Cornman 《Peabody Journal of Education》2013,88(2-3):311-386

In January 2004 President Bush authorized the DC School Choice Incentive Act, an initiative funded at $14 million that created a scholarship program providing 1,700 low-income Washington, DC, children the opportunity to attend participating K–12 nonpublic schools in the district. In addition to offering opportunities to participating children, the DC Opportunity Scholarship Program opens a door for examining the implications when more families are given the opportunity to select private schools for their children. This article reviews the results of a qualitative assessment aimed at understanding how families experienced their first year in the program. Referencing direct quotes from families that took part in focus groups, we address the following areas of participants' experience: reaction to the choice opportunity, motivation for participation, what was valued in schools, how information was received, selection of final school, reaction to new school environment, parent responses to new challenges, student–school responses to new challenges, financial policies, and overall satisfaction. Each section contains family responses juxtaposed with popular literature on school choice. This report is the first in a series that will monitor the experiences of families during the first 5 years of this program.  相似文献   

Academic Improvement Through Regular Assessment     

Patrick J. Wolf 《Peabody Journal of Education》2013,88(4):690-702

Media reports are rife with claims that students in the United States are overtested and that they and their education are suffering as result. Here I argue the opposite—that students would benefit in numerous ways from more frequent assessment, especially of diagnostic testing. The regular assessment of students serves critical educational and life-learning functions. It focuses the efforts of educators and students on mastering important material. Testing provides educators with crucial intelligence about the needs and abilities of students and the performance of academic programs. Regular assessment provides students and parents with useful feedback regarding how well the student is building important skills and knowledge. It allows both parents and educators to identify motivational and learning problems with individual students at an early stage, when interventions have the greatest prospects for success. It is especially important in the areas of early reading acquisition and special education, supposedly “sensitive” areas where educators often eschew regular assessment. Finally, standardized testing provides students with an important skill—test-taking experience and facility—that will serve them well throughout their lives. A wealth of evidence confirms that testing alone boosts student achievement.  相似文献   

On the meaning of free software     

M. J. Wolf  K. W. Miller  F. S. Grodzinsky 《Ethics and Information Technology》2009,11(4):279-286

To many who develop and use free software, the GNU General Public License represents an embodiment of the meaning of free software. In this paper we examine the definition and meaning of free software in the context of three events surrounding the GNU General Public License. We use a case involving the GPU software project to establish the importance of Freedom 0 in the meaning of free software. We analyze version 3 of the GNU General Public License and conclude that although a credible case can be made that the added restrictions are consistent with the definition of free software, the case requires subtle arguments. Strong arguments against the added restrictions are less subtle, and may therefore be more convincing to many users and developers. We also analyze the Affero General Public License and conclude that it is inconsistent with the definition of free software.  相似文献