Seated versus standing position for maximization of performance during intense uphill cycling     

Hansen EA  Waldeland H 《Journal of sports sciences》2008,26(9):977-984

It is not known whether the seated or standing position favours performance during intensive bouts of uphill cycling. The following hypotheses were therefore tested: (1) the standing position results in better performance at a high power output, while (2) the seated position is best at a moderate power output. We also assessed the seated-standing transition intensity, above which seated cycling should be superseded by standing cycling for maximization of performance. Ten male cyclists (mean age 27 years, s = 3; height 1.82 m, s = 0.07; body mass 75.2 kg, s = 7.0; VO2max 70.0 ml.kg(-1).min(-1), s = 5.2) performed seated and standing treadmill cycling to exhaustion at 10% grade and at four power outputs ranging from 86% to 165% of their power output at maximal oxygen uptake (Wmax). Power output at maximal oxygen uptake was obtained during determination of VO2max. There was no difference in time to exhaustion between the two cycling positions at 86% of Wmax (P = 0.29). All participants performed best at the highest power output (165% of Wmax) when standing (P = 0.002). An overall seated-standing transition intensity of 94% of Wmax was identified. Thus, in general, cyclists may choose either the standing or seated position for maximization of performance at a submaximal intensity of 86% of Wmax, while the standing position should be used at intensities above 94% of Wmax and approaching 165% of Wmax.  相似文献   

HANSEN VS. HOBSON: JUDICIAL INTERVENTION IS BEING TESTED     

Carl F. Hansen 《Equity & Excellence in Education》2013,46(5):23-29

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Pole length affects cross-country skiers’ performance in an 80-m double poling trial performed on snow from standing start   总被引：1，自引：1，他引：0  

Ernst Albin Hansen  Thomas Losnegard 《Sports Engineering》2010,12(4):171-178

We investigated the hypothesis that longer and shorter poles would be faster and slower, respectively, than poles of self-selected length in all-out double poling. Eight elite cross-country skiers performed 80 m all-out double poling on snow performed from a standing start. Three trials with each of the pole lengths: self-selected, 7.5 cm shorter, and 7.5 cm longer than self-selected were performed. Time was recorded every 20 m and skiers were filmed during the last 40 m for calculation of cycle rate and length. Times at 80 m were 0.9 ± 0.7% shorter with longer poles than with self-selected poles (p ≤ 0.05), while they were 1.2 ± 1.0% slower with shorter poles (p ≤ 0.05). Much of these differences were established within the first 20 m. Calculated lead at 80 m with longer poles was 0.88 ± 0.65 m over self-selected poles (p ≤ 0.05). Mean cycle rate and length ranged from 1.35 to 1.45 Hz and from 4.84 to 5.52 m, respectively, across pole lengths (p > 0.05).  相似文献   

The impact of polices on government social media usage: Issues, challenges, and recommendations     

John Carlo Bertot Paul T. Jaeger  Derek Hansen 《Government Information Quarterly》2012,29(1):30-40

Government agencies are increasingly using social media to connect with those they serve. These connections have the potential to extend government services, solicit new ideas, and improve decision-making and problem-solving. However, interacting via social media introduces new challenges related to privacy, security, data management, accessibility, social inclusion, governance, and other information policy issues. The rapid adoption of social media by the population and government agencies has outpaced the regulatory framework related to information, although the guiding principles behind many regulations are still relevant. This paper examines the existing regulatory framework and the ways in which it applies to social media use by the U.S. federal government, highlighting opportunities and challenges agencies face in implementing them, as well as possible approaches for addressing these challenges.  相似文献   

Graph Magic: A Visual Graph Package for Students     

Stuart Hansen  Karen Tuinstra  Jason Pisani  Lester I. McCann 《Computer Science Education》2013,23(1):53-66

This paper presents Graph Magic, a package of Java classes that represents graphs. It is specifically designed for undergraduate students to use early in their studies. It combines graph visualization with ease of programming. It allows students to implement graph algorithms using high level, easy to understand methods. Students create graphs for their programs interactively. Their programs manipulate the graphs while the students continue to view them. The emphasis on interactive editing combined with interruptible viewing provides a powerful tool for student exploration of graph concepts and algorithms.  相似文献   

Editor's introduction: Science‐technology‐society education     

Linda Hansen  Martin Monk 《International Journal of Science Education》2013,35(4):343-356

This paper provides a review of evidence on the way the maturation of the brain may structure the plasticity that is available for the construction of the mind. The evidence reviewed is that taken from non-invasive imaging techniques that make use of electrode potentials, magnetic resonance or positron emission. Such imaging techniques allow the brain to be studied as specific mental tasks are carried out. Sites and processing pathways can be identified and correlated with other evidence. A review of data on the development of the brain in terms of the grey (dendritic branching) and white (myelination) matter is discussed with respect to the clinical observation of stages of cognitive processing.  相似文献   

Utilizing Video Conferencing to Introduce an International Perspective to Foundation Practice     

Mary Ann Forgey  Hilda Loughran  Johna Hansen 《Journal of Teaching in Social Work》2013,33(4-5):449-466

Video conferencing has much potential to enrich international social work education. In this educational initiative, video conferencing was used to deliver a joint foundation social work practice class to students attending an MSW degree program both in the United States and in Ireland. Student feedback indicated that they gained an appreciation of the global nature of social work practice. They reported a deeper understanding of shared theoretical perspectives in relation to client engagement, and of the differences in many fields of practice. Students recommended additional opportunities for international discourse using both synchronous and asynchronous distance education methods.  相似文献   

Behavioural disorders in Danish schools: a quantitative survey     

Niels Egelund  Kim Foss Hansen 《欧洲特需教育杂志》2013,28(2):158-170

Behavioural problems in schools have been a topic of political debate in Denmark recently. The last time the topic was in the news was before the establishing of special educational provisions for pupils with social and emotional disorders in the 1960s. As a result of the recent debate, a national survey was made. It shows that the incidence of serious problems is 10 per cent. Comparisons with earlier studies indicate that there is an increase in behavioural problems during the first years of primary schooling. A multivariate analysis shows that pupils gender, the degree of urbanization, teacher experience and geographical location are significant predictors of disturbance, while school size, class size, teacher age and gender are insignificant.  相似文献   

Re-imagining ‘Bildung zur Humanität’: how I developed the Dialogos approach to practical philosophy through action inquiry research     

Guro Hansen Helskog 《Educational Action Research》2013,21(3):416-435

This paper presents an account of how I developed the Dialogos approach to practical philosophy through action inquiry research. The process of development is understood as a contribution to the reconstruction of the notion ‘Bildung zur Humanität’ as an ideal in education. Core perspectives, traditions and purposes involved in the action inquiry research process are outlined, discussed and divided into three phases: the humanistic–pedagogical phase, the ethical–philosophical phase, and the existential–spiritual phase. The Dialogos approach was later systematically tried out and evaluated through philosophical dialogues in empirical action research processes in the Gandhi Project and the Reconciliation Project.  相似文献   

Backlash: South Asian immigrant voices on the margins     

Sarah Hansen 《International Studies in Sociology of Education》2013,23(3):265-272

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