Effects of radiant heat exposure on pacing pattern during a 15-km cycling time trial

Abstract

The goal of this study was to investigate the effects of different durations of skin temperature manipulation on pacing patterns and performance during a 15-km cycling time trial. Nineteen well-trained men completed three 15-km cycling time trials in 18°C and 50% relative humidity with 4.5-km (short-heat), 9.0-km (long-heat) or without (control) radiant heat exposure applied by infrared heaters after 1.5 km in the time trial. During the time trials, power output, mean skin temperature, rectal temperature, heart rate and rating of perceived exertion were assessed. The radiant heat exposure resulted in higher mean skin temperature during the time trial for short-heat (35.0 ± 0.6°C) and long-heat (35.3 ± 0.5°C) than for control (32.5 ± 1.0°C; P < 0.001), whereas rectal temperature was similar (P = 0.55). The mean power output was less for short-heat (273 ± 8 W; P = 0.001) and long-heat (271 ± 9 W; P = 0.02) than for control (287 ± 7 W), but pacing patterns did not differ (P = 0.55). Heart rate was greatest in control (177 ± 9 beats · min^?1; P < 0.001), whereas the rating of perceived exertion remained similar. We concluded that a radiant heat exposure and associated higher skin temperature reduced overall performance, but did not modify pacing pattern during a 15-km cycling time trial, regardless of the duration of the exposure.     

Living arrangements and children's development in low-income White, Black, and Latino families

This article uses longitudinal data from approximately 2,000 low-income families participating in the national evaluation of the Comprehensive Child Development Program to examine the associations between preschool children's living arrangements and their cognitive achievement and emotional adjustment. The analysis distinguishes families in which children live only with their mothers from children who live in biological father, blended, and multigenerational households. Linkages are examined separately for White, Black, and Latino children. Fixed effects regression techniques reveal few significant associations between living arrangements and child development. These findings suggest that substantial diversity exists in the developmental contexts among children living in the same family structure. Policies seeking to change the living arrangements of low-income children may do little to improve child well-being.     

Students as co-producers in a multidisciplinary software engineering project: addressing cultural distance and cross-cohort handover

This article reports an undergraduate software engineering project in which, over a period of 2 years, four student teams from different cohorts developed a note-taking app for four academic clients at the students’ own university. We investigated how projects involving internal clients can give students the benefits of engaging in real software development while also giving them experience of a student-staff collaboration that has its own benefits for students, academics, and the university more broadly. As the university involved is a Sino-Foreign university located in China, where most students are Chinese and most teaching staff are not, this ‘student as co-producer’ approach interacts with another feature of the project: cultural distance. Based on analysis of notes, reports, interviews, and focus groups, we recommend that students should be provided with communicative strategies for dealing with academics as clients; universities should develop policies on ownership of student-staff collaborations; and projects should include a formalised handover process. This article can serve as guidance for educators considering a ‘students as co-producers’ approach for software development projects.     

Images in mirrors: Recollections,alternative explanations and modes of cognitive functioning

Students' conceptions of how objects are seen directly, and in mirrors, were explored in an analysis of their written and drawn responses to common visual phenomena depicted in cartoons with brief text. Students in Grades K-10 (n=214) completed a questionnaire and some were interviewed. Evidence was sought to support an hypothesis for increasingly sophisticated responses related to the concepts of sight, light, reflection and image. The developmental model used in this analysis was the updated SOLO Taxonomy (Biggs & Collis, 1991; Collis & Biggs 1991). It appears from the results that different modes of functioning can interfere to produce factually incorrect recollections of experience particularly in the age group 7 to 13 years approximately. Also, this is associated with the common spurious conception that mirrors have a lateral inversion property. Explanations involving light were extremely rare and its role related to the production of an image ‘in the mirror’ but not to the perception of an image in the eyes. Specializations: science education, students' understandings of phenomena in science. Specializations: cognitive development, evaluation, mathematics and science education. Specializations: mathematics education, students' understanding of chance and data concepts.     

Hedonic and utilitarian value: the role of shared responsibility in higher education services

While on-campus student housing availability has been shown to improve retention, the interdependence between students and providers in creating the value of campus living has not been explored. This paper, therefore, draws on theories from marketing and education to investigate the role of shared responsibility in educational service outcomes (perceived utilitarian value, perceived hedonic value, satisfaction, and positive word-of-mouth) in the context of university housing. Analysis using a general linear model shows that all dependent variables increase as students’ sense of shared responsibility increases. These results contribute to the literature by introducing the notion of shared responsibility to the examination of student housing value perceptions. After implications for various stakeholders are discussed, recommendations for future research are given.     

复杂系统视角下的组织学习动态过程研究

组织是一个具有无尺度网络结构的复杂系统。组织学习作为组织获取核心竞争力和可持续发展能力的重要手段,是一个动态的过程:从组织学习发生的载体来看,主要有个人、团队和组织等三个层次;就组织学习发生的方式来看,包括单环学习、双环学习和三环学习等三种模式;而从组织学习过程本身来看,则分为直觉感知、解释说明、归纳整合和制度化等四个子过程。本文在系统回顾相关研究成果的基础上,从复杂系统的角度对组织学习过程进行了系统的模型整合和创新,对复杂系统环境下如何构建学习型组织的可能遇到的障碍进行了一系列的分析。     

The Heuristic for Thinking About Culturally Responsive Teaching (HiTCRiT)

Michèle was hurrying to class. How, she thought, could she offer the students in her African American English in Society and Schools class a method of understanding, comparing, and abstracting the studies they had been reading in class? The heuristic described in this study evolved from a desire to capture aspects of several seminal studies that illustrated how African American English was deployed in classrooms for productive work with African American students. Michèle recalled that whenever she asked graduate students or practicing teachers what they, other teachers, and schools might do to improve the schooling of students of color, one of the most consistent responses was Culturally Responsive Pedagogy (CRP). However, when pressed and asked what one would detect in classrooms where CRP is being put into practice, few were able to specify what an observer might see. Specifying the dimensions of CRP and its relationship to the heuristic had not been on Michèle’s mind. Even so, it was during the class discussion that the heuristic’s relevance to CRP became clearer. Jonathan, who had been tapped as a teaching assistant in an English language arts methods class, believed HiTCRiT could be modified to use with teacher education candidates, as a substitute for the standardized lesson planning tool used in the department. He piloted its use with the class the following semester. Utilizing HiTCRiT to explain research and existing practices as well as to assist teachers in creating culturally relevant instruction modified and shaped it, creating a more robust tool. Thus, the HiTCRiT came into being and came to inform our thinking and teaching practice.     

Characterising the impact performance of field hockey sticks

Published research on field hockey equipment is scarce. The aim of this research was to investigate methods for characterising the impact performance of field hockey sticks. Three sticks were used with fundamental frequencies in the range 74?C154?Hz. Striking an initially still ball with a stick was identified as the preferred method for characterising performance. Impacts were simulated at mean velocities of 19?m/s at toe and 16?m/s at the shaft. The mean apparent coefficient of restitution and standard deviation were ?0.32?±?0.05 at the toe and ?0.18?±?0.02 at the shaft. The foundation work presented here provides the foundations for developing a methodology for characterising the impact performance of field hockey sticks.