Validity and reliability of GPS for measuring instantaneous velocity during acceleration, deceleration, and constant motion

In this study, we assessed the validity and reliability of 5 and 10 Hz global positioning systems (GPS) for measuring instantaneous velocity during acceleration, deceleration, and constant velocity while straight-line running. Three participants performed 80 running trials while wearing two GPS units each (5 Hz, V2.0 and 10 Hz, V4.0; MinimaxX, Catapult Innovations, Scoresby, VIC, Australia). The criterion measure used to assess GPS validity was instantaneous velocity recorded using a tripod-mounted laser. Validity was established using the standard error of the estimate (± 90% confidence limits). Reliability was determined using typical error (± 90% confidence limits, expressed as coefficient of variation) and Pearson's correlation. The 10 Hz GPS devices were two to three times more accurate than the 5 Hz devices when compared with a criterion value for instantaneous velocity during tasks completed at a range of velocities (coefficient of variation 3.1-11.3%). Similarly, the 10 Hz GPS units were up to six-fold more reliable for measuring instantaneous velocity than the 5 Hz units (coefficient of variation 1.9-6.0%). Newer GPS may provide an acceptable tool for the measurement of constant velocity, acceleration, and deceleration during straight-line running and have sufficient sensitivity for detecting changes in performance in team sport. However, researchers must account for the inherent match-to-match variation reported when using these devices.     

Remembering Beijing

Every General Assembly is remembered for something - in the past few years, Sydney for starting the International Year of Astronomy, Prague for Pluto, and Rio de Janeiro for the Strategic Plan. 1 thoug...     

Developmental trajectories of personal and collective self-concept among American Indian adolescents

Developmental trajectories of personal and collective self-concept were examined among American Indian adolescents. Personal self-concept (self-esteem) and collective self-concept (American Indian identity, Euro-American identity, community-mindedness) were assessed 6 times over 3 years in 4 cohorts of adolescents from 3 American Indian cultural groups (N=1,252). An accelerated longitudinal design was used to estimate developmental trajectories from 14 to 19 years; parallel-process and covariate models were used to examine variation in trajectories. Both personal and collective self-concepts were generally positive and showed small gains; they were moderately related to one another and differentially related to cultural group, gender, and perceived social support. The findings highlight the complexity of self-concept for American Indian youth and the significance of both personal and collective identity.     

Teacher training and ‘quality’ in higher education language teaching: strategies and options

The article focuses on the training of higher education language teachers from a quality enhancement perspective. After a brief discussion of the nature of quality in higher education, the article considers the implications which the expansion of language learning in higher education in Europe has for the teachers involve in designing and delivering language programmes. The main body of the article is then devoted to a discussion of the strategies and options in the field of the training of language teachers which emerged from reports on quality enhancement in higher education language studies prepared in 18 European countries. The reports were prepared within the framework of Thematic Network Project 2, organised by the European Language Council. The article concludes by highlighting the crucial role of teacher training in the ‘quality cycle’ with respect to both teaching and student learning.

L'article traite de la formation d'enseignants de langue travaillant dans l'enseignement supérieur d'une perspective axée sur l'amélioration de la qualité. Suite à une brève discussion de la notion de qualité dans l'enseignement supérieur, l'article examine les implications de l'expansion de l'apprentissage des langues dans l'enseignement supérieur en Europe pour les enseignants responsables de la conception et de la réalisation pédagogique de programmes de langue. La partie principale de l'article est alors consacrée à l'analyse des choix et stratégies dans le domaine de la formation d'enseignants de langues qui se sont dégagés de rapports sur l'amélioration de la qualité dans le domaine des langues dans l'enseignement supérieur dans 18 pays de l'Europe. Ces rapports furent préparés dans le cadre du Projet de Réseau Thématique 2, organisé par le Conseil Européen pour les Langues. En conclusion, l'article souligne le rôle crucial joué par la formation des enseignants par rapport à la qualité autant de l'enseignement que de l'apprentissage des langues par les étudiants.

El artículo trata de la formación de profesores de lengua que trabajan en la enseñanza superior, desde la perspectiva de la mejora de la calidad. Tras una breve discusión acerca de la noci?n de calidad en la enseñanza superior, el artículo examina las implicaciones de la expansión del aprendizaje de las lenguas en la enseñanza superior en Europa para los profesores responsables de la concepción y de la realización pedagógica de programas de lengua. La parte principal del artículo se consagra por tanto al análisis de las elecciones y estrategias en el campo de la formación de profesores de lenguas, tal como se desprenden de los informes sobre la mejora de la calidad en el campo de las lenguas en la enseñanza superior en 18 países de Europa. Estos informes fueron preparados en el marco del Proyecto de Red Temática 2, organizado por el Consejo Europeo para las Lenguas. En conclusión, el artículo subraya el papel crucial desempeñado por la formación de los profesores en la calidad tanto de la ensepanza como del aprendizaje de las lenguas por los estudiantes.

Der Artikel behandelt die Ausbildung von Sprachlehrkräften an Hochschulen aus der Sicht der Qualitätsverbesserung. Nach einer kurzen Erörterung der Spezifität der Qualität in der Hochschulbildung, befasst sich der Artikel mit den Konsequenzen des verstärkten Lehrens und Lernens von Sprachen an Hochschulen für die mit der Planung und Umsetzung von Sprachlehrprogrammen betrauten Lehrkräfte. Der Hauptteil des Artikels ist der Analyse von Strategien und Möglichkeiten im Bereich der Ausbildung von Sprachlehrkräften gewidmet, die aus 18 europäischen Länderberichten über Qualitätsverbesserung im Sprachenbereich an Hochschulen hervorgingen. Diese Berichte wurden innerhalb des vom Europäischen Sprachenrat organisierten Thematischen Netzwerkprojekts Sprachen II (TNP2) erstellt. Am Schluss des Artikels wird die entscheidende Rolle der Ausbildung der Sprachlehrkräfte für die Qualität des Lehrens und Lernens von Sprachen an Hochschulen hervorgehoben.     

How many deaf people are there in the United States? Estimates from the Survey of Income and Program Participation

The Survey of Income and Program Participation (SIPP) is one of a few national surveys that regularly collects data identifying the American population of persons with hearing loss or deafness. Estimates from the SIPP indicate that fewer than 1 in 20 Americans are currently deaf or hard of hearing. In round numbers, nearly 10,000,000 persons are hard of hearing and close to 1,000,000 are functionally deaf. More than half of all persons with hearing loss or deafness are 65 years or older and less than 4% are under 18 years of age. However, these findings are limited to those who report difficulty hearing "normal conversation" and do not include the larger population of persons with hearing loss for which only hearing outside the range and circumstances of normal conversation is affected. Policy makers, communications technology manufacturers, health and education service providers, researchers, and advocacy organizations have an interest in these results.     

Children's ability to impute inferentially based knowledge

Do young children appreciate the importance of access to premises when judging what another person knows? In Experiment 1, 5-year-olds (N=31) were sensitive to another person's access to premises when predicting that person's ability to point to a target after eliminating alternatives in a set of 3 cartoon characters. Experiment 2 replicated the finding when 5- to 6-year-olds (N=102) judged who the other person thought the target was, and whether the other person knew who the target was. Experiment 3 demonstrated that children aged 5-7 years (N=107) more successfully imputed inference by elimination than syllogistical inferential knowledge. Findings suggest that an early understanding of inference by elimination offers a route into understanding that people can sometimes gain knowledge without direct perceptual access.     

From organelle to protein gel: a 6-wk laboratory project on flagellar proteins

Research suggests that undergraduate students learn more from lab experiences that involve longer-term projects. We have developed a one-semester laboratory sequence aimed at sophomore-level undergraduates. In designing this curriculum, we focused on several educational objectives: 1) giving students a feel for the scientific research process, 2) introducing them to commonly used lab techniques, and 3) building skills in both data analysis and scientific writing. Over the course of the semester, students carry out two project-based lab experiences and write two substantial lab reports modeled on primary literature. Student assessment data indicate that this lab curriculum achieved these objectives. This article describes the first of these projects, which uses the biflagellate alga Chlamydomonas reinhardtii to introduce students to the study of flagellar motility, protein synthesis, microtubule polymerization, organelle assembly, and protein isolation and characterization.     

Thinking through practice: exploring ways of knowing,understanding and representing the complexity of teaching

In recent times there has been a cross-disciplinary amplification of interest in the concept of practice. In this context, there is a growing body of research considering how teaching and teacher education might be viewed using the conceptual lens of practice. In this article, I explore practice theories to identify common themes and principles that constitute a conceptual framework for the investigation of the lived experience of teaching. From this foundation, a methodological framework based on collaborative inquiry and postmodern emergence is derived. Examples are offered of the way the conceptual framework and methodological approach have been activated through the first stage of a research programme that collaboratively engages the dual voices of academic researcher and classroom practitioners as co-researchers. Analysis of qualitative data reveals the potential and limitations of this practice-based foundation as a way to know, understand and represent the complexity of teaching. In conclusion, the article develops a number of propositions as the basis for further research.