Electrical and mechanical response of skeletal muscle to electrical stimulation after acute passive stretching in humans: A combined electromyographic and mechanomyographic approach

Abstract

Flexural and torsional rigidity are important properties of skis. However, the flexural and torsional rigidity that lead to optimal performance remain to be established. In the present study, four pairs of slalom skis that differed in flexural and torsional rigidity were tested by advanced and expert skiers. Using a 10-item questionnaire, different aspects of the skis' performance were rated on a 9-point scale. For each pair of skis, physical measurements were compared with the ratings of the two groups of skiers. Correlations (Spearman) were then determined between (i) different mechanical properties of the skis (static and dynamic), (ii) subjective assessments of the participants, and (iii) properties of the skis and the participants' assessments. The latter showed that expert skiers rate the aspects of the skis more accurately than advanced skiers. Most importantly, expert skiers are particularly sensitive to torsion of the skis. These results suggest that such highly rated elements should be addressed in future ski designs.     

Informing Institutional Management: institutional strategies and student retention

European universities are facing demands for better student retention, especially in countries where state funding is no longer based on the number of students, but on the number of graduates. An extensive literature on retention focuses on the characteristics of students who leave higher education without a degree. Much less is known about the measures taken by higher education institutions to encourage study progress. This article examines whether retention strategies are incorporated into the institutions’ overall strategies and the policies and activities developed by universities to foster study progress and enhance retention rates. The results suggest that the universities’ overall strategies and retention activities are loosely coupled and that the universities tend to use blanket measures addressing retention, regardless of why students are leaving.     

Academic self-concept, interest, grades, and standardized test scores: reciprocal effects models of causal ordering

Reciprocal effects models of longitudinal data show that academic self-concept is both a cause and an effect of achievement. In this study this model was extended to juxtapose self-concept with academic interest. Based on longitudinal data from 2 nationally representative samples of German 7th-grade students (Study 1: N = 5,649, M age = 13.4; Study 2: N = 2,264, M age = 13.7 years), prior self-concept significantly affected subsequent math interest, school grades, and standardized test scores, whereas prior math interest had only a small effect on subsequent math self-concept. Despite stereotypic gender differences in means, linkages relating these constructs were invariant over gender. These results demonstrate the positive effects of academic self-concept on a variety of academic outcomes and integrate self-concept with the developmental motivation literature.     

Moral motivation and the battle for students: The case of studies in nursing and social work in Norway

This paper presents data from a project onmoral motivation. It is more pragmaticallyframed on what it is that attracts students to`untrendy' fields and makes them want to do agood job. As the value structure in societychanges and the battle for students hardens,there is a growing concern that fields crucialto the development of society may lose out inthe competition for the best students. Amongthe fields that have received attention inthese debates are nursing and social work. Inpart, this is due to the fact that these fieldshave already experienced a decline inapplicants which merits concern, and in partdue to the image these studiesproject. In the debate on intake qualitiesfocus has primarily been on the academicquality of the students, and less on themotivational qualities that work of this typeimplies. The data presented here highlightsqualities related to this dimension ofprofessional work.     

‘Discover,Understand, Implement,and Transfer’: Effectiveness of an intervention programme to motivate students for science

Considerable research has focused on how best to satisfy modern societies’ needs for skilled labour in the field of science. The present study evaluated an intervention programme designed to increase secondary school students’ motivation to pursue a science career. Students from 3 schools of the highest educational track participated for up to 2 years in the intervention programme, which was implemented as an elective in the school curriculum. Our longitudinal study design for evaluating the effectiveness of the intervention programme included all students at the grade levels involved in the programme with students who did not participate serving as a control group. Mixed-model analyses of variance showed none of the intended effects of the intervention programme on science motivation; latent growth models corroborated these results. When the programme began, students who enrolled in the science elective (n?=?92) were already substantially more motivated than their classmates (n?=?228). Offering such an intervention programme as an elective did not further increase the participating students’ science motivation. It seems worthwhile to carry out intervention programmes with talented students who show (comparatively) little interest in science at the outset rather than with highly motivated students who self-select into the programme.     

Editorial

Ohne Zusammenfassung

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Editorial

     

Sozialverhalten und Schulleistungen

Prior research indicates that social behavior contributes to school achievement. The underlying mechanisms, however, have received little research attention to date. To investigate peer acceptance as mediating the influences of prosocial and antisocial behavior on school grades, this prospective study draws on 2387 ninth graders. All students in a class rated their peers in terms of prosocial and antisocial behavior, class teachers rated their students’ peer acceptance in class, and grades in German and mathematics were collected from students’ report cards. Prior report card grades, gender and socioeconomic status were controlled for. Structural equation modeling shows direct positive paths between prosocial behavior and both peer acceptance and grades; antisocial behavior negatively predicted both peer acceptance and grades. Prosocial behavior contributed to better grades via higher peer acceptance, whereas concerning antisocial behavior, the mediating effect was statistically not significant. Results are discussed with regard to their practical relevance and implications for future research.     

Cycling power output produced during flat and mountain stages in the Giro d'Italia: a case study

Until recently, the physiological demands of cycling competitions were mostly reflected by the measurement of heart rate and the indirect estimation of exercise intensity. The purpose of this case study was to illustrate the varying power output of a professional cyclist during flat and mountain stages of a Grand Tour (Giro d'Italia). Nine stage recordings of a cyclist of the 2005 Giro d'Italia were monitored using a mobile power measurement device (SRM Trainingssystem, Julich, Germany), which recorded direct power output and heart rate. Stages were categorized into flat (n = 5) and mountain stages (n = 4). Data were processed electronically, and the overall mean power in flat and mountain stages and maximal mean power for various durations were calculated. Mean power output was 132 W +/- 26 (2.0 W x kg(-1) +/- 0.4) for the flat and 235 W +/- 10 (3.5 W x kg(-1) +/- 0.1) for the mountain stages. Mountain stages showed higher maximal mean power (367 W) for longer durations (1800 s) than flat stages (239 W). Flat stages are characterized by a large variability of power output with short bursts of high power and long periods with reduced intensity of exercise, whereas mountain stages mostly require submaximal, constant power output over longer periods.