A protocol for measuring the direct effect of cycling on neuromuscular control of running in triathletes     

Andrew R. Chapman  Bill Vicenzino  Paul W. Hodges  Peter Blanch  Allan G. Hahn  Theodore E. Milner 《Journal of sports sciences》2013,31(7):767-782

Abstract

The direct effects of cycling on movement and muscle recruitment patterns (neuromuscular control) during running are unknown but critical to success in triathlon. We outline and test a new protocol for investigating the direct influence of cycling on neuromuscular control during running. Leg movement (three-dimensional kinematics) and muscle recruitment (surface electromyography, EMG) were compared between a control run (no prior exercise) and a 30-min transition run that was preceded by 20 min of cycling. We conducted three experiments investigating: (a) the repeatability (between-day reliability) of the protocol; (b) the ability of the protocol to investigate, in highly trained national or international triathletes, the direct influence of cycling on neuromuscular control during running independent of neuromuscular fatigue; and (c) the ability of the protocol to provide a control, or baseline, measure of neuromuscular control (determined using a measure of stability) without causing fatigue. Kinematic and EMG measures of neuromuscular control during running showed moderate to high repeatability: mean coefficients of multiple correlation for repeatability of EMG and kinematics were 0.816 ± 0.014 and 0.911 ± 0.031, respectively. The protocol provided a robust baseline measure of neuromuscular control during running without causing neuromuscular fatigue (coefficients of multiple correlation for stability of EMG and kinematics were 0.827 ± 0.023 and 0.862 ± 0.054), while EMG and force data provided no evidence of fatigue. The protocol outlined here is repeatable and can be used to measure any direct influence of cycling on neuromuscular control during running.  相似文献   

Different types of compression clothing do not increase sub-maximal and maximal endurance performance in well-trained athletes     

Billy Sperlich  Matthias Haegele  Silvia Achtzehn  John Linville  Hans-Christer Holmberg  Joachim Mester 《Journal of sports sciences》2013,31(6):609-614

Abstract

Three textiles with increasing compressive surface were compared with non-compressive conventional clothing on physiological and perceptual variables during sub-maximal and maximal running. Fifteen well-trained endurance athletes (mean ± s: age 27.1 ± 4.8 years, [Vdot]O_2max 63.7 ± 4.9 ml · min^?1 · kg^?1) performed four sub-maximal (～70%[Vdot]O_2max) and maximal tests with and without different compression stockings, tights, and whole-body compression suits. Arterial lactate concentration, oxygen saturation and partial pressure, pH, oxygen uptake, and ratings of muscle soreness were recorded before, during, and after all tests. In addition, we assessed time to exhaustion. Sub-maximal (P = 0.22) and maximal oxygen uptake (P = 0.26), arterial lactate concentration (P = 0.16; 0.20), pH (P = 0.23; 0.46), oxygen saturation (P = 0.13; 0.26), and oxygen partial pressure (P = 0.09; 0.20) did not differ between the types of clothing (effect sizes = 0.00–0.45). Ratings of perceived exertion (P = 0.10; 0.15), muscle soreness (P = 0.09; 0.10) and time to exhaustion (P = 0.16) were also unaffected by the different clothing (effect sizes = 0.28–0.85). This was the first study to evaluate the effect on endurance performance of different types of compression clothing with increasing amounts of compressive surface. Overall, there were no performance benefits when using the compression garments.  相似文献   

Resource constraints as triggers of radical innovation: Longitudinal evidence from the manufacturing sector     

Marcus Matthias Keupp  Oliver Gassmann 《Research Policy》2013

Despite the significant role of radical innovation as a driver of firm growth and performance, the consequences of resource constraints for radical innovation outcomes remain unknown. Our paper addresses this gap. We combine arguments from entrepreneurship theory and the theory of recombinative innovation to construct an overarching theoretical framework that argues why resource constraints can promote, rather than impede, radical innovation. We then build hypotheses on two specific resource constraints, knowledge and financial, and test these by a lagged-variable random-effects Tobit model with longitudinal data from an exceptionally large and detailed innovation survey. Controlling for absorptive capacity, firm age, and firm growth, we find full support for the hypothesis that knowledge constraints spur radical innovation and partial support for the hypothesis that financial constraints spur radical innovation. We discuss the theoretical significance of these findings and point to managerial implications and paths for future research.  相似文献   

Synthesising case-study research – ready for the next step?     

Matthias Barth  Ian Thomas 《Environmental Education Research》2012,18(6):751-764

Within the emerging field of research on education for sustainability (EfS), case studies are an important if not the predominant research approach, although often criticised for its lack of internal and external validity and a tendency to draw conclusions with insufficient rigour. While, basic concerns have been expressed and discussed in an early issue of this journal, main assumption still hold true after more than 10 years of research in the field. Only a few approaches so far have tackled the challenge to provide cross-case comparison and the synthesis of case-study results still remains a research desideratum. In this paper, we argue that developments in the field of qualitative and quantitative meta-analysis in educational science offer a framework, which can be used to overcome that shortcoming. After describing the idea of research synthesis, different types of such a meta-analysis are identified and their potential is discussed for existing case studies in higher EfS. This paper concludes with recommendations for further case-study research in the field.  相似文献   

Stability of Core Language Skill from Early Childhood to Adolescence: A Latent Variable Approach     

Marc H. Bornstein  Chun‐Shin Hahn  Diane L. Putnick  Joan T. D. Suwalsky 《Child development》2014,85(4):1346-1356

This four‐wave prospective longitudinal study evaluated stability of language in 324 children from early childhood to adolescence. Structural equation modeling supported loadings of multiple age‐appropriate multisource measures of child language on single‐factor core language skills at 20 months and 4, 10, and 14 years. Large stability coefficients (standardized indirect effect = .46) were obtained between language latent variables from early childhood to adolescence even when accounting for child nonverbal intelligence and social competence and maternal verbal intelligence, education, speech, and social desirability. Stability coefficients were similar for girls and boys. Stability of core language skill was stronger from 4 to 10 to 14 years than from 20 months to 4 years, so early intervention to improve lagging language is recommended.  相似文献   

Institutional abuse of children in the Austrian Catholic Church: Types of abuse and impact on adult survivors’ current mental health     

Brigitte Lueger-Schuster  Viktoria KantorDina Weindl  Matthias KnefelYvonne Moy  Asisa ButolloReinhold Jagsch  Tobias Glück 《Child abuse & neglect》2014

The aim of this study was to explore the nature and dimensions of institutional child abuse (IA) by the Austrian Catholic Church and to investigate the current mental health of adult survivors. Data were collected in two steps. First, documents of 448 adult survivors of IA (M = 55.1 years, 75.7% men) who had disclosed their abuse history to a victim protection commission were collected. Different types of abuse, perpetrator characteristics, and family related risk factors were investigated. Second, a sample of 185 adult survivors completed the Posttraumatic Stress Disorder Checklist (PCL-C) and the Brief Symptom Inventory (BSI). Participants reported an enormous diversity of acts of violent physical, sexual, and emotional abuse that had occurred in their childhood. The majority of adult survivors (83.3%) experienced emotional abuse. Rates of sexual (68.8%) and physical abuse (68.3%) were almost equally high. The prevalence of PTSD was 48.6% and 84.9% showed clinically relevant symptoms in at least one 1 of 10 symptom dimensions (9 BSI subscales and PTSD). No specific pre-IA influence was found to influence the development of PTSD in later life (e.g. poverty, domestic violence). However, survivors with PTSD reported a significantly higher total number of family related risk factors (d = 0.33). We conclude that childhood IA includes a wide spectrum of violent acts, and has a massive negative impact on the current mental health of adult survivors. We address the long-term effects of these traumatic experiences in addition to trauma re-activation in adulthood as both bear great challenges for professionals working with survivors.  相似文献   

Beyond Consultation: A New Model for Librarian's Office Hours     

Susan Avery  Jim Hahn  Melissa Zilic 《Public Services Quarterly》2013,9(3):187-206

ABSTRACT

Given the many changes in our students and their study and research practices, libraries are finding it necessary to seek new ways to reach these students. The Undergraduate Library at the University of Illinois at Urbana-Champaign created a new model to do so. Librarian's Office Hours are a hybrid of reference and instructional services that fulfill the dual purposes of meeting the needs of term paper research counseling and library workshops. This article discusses the strategies involved in the creation and implementation of this service and examines suggestions for the future of such a service.  相似文献   

Statistical Models and Inference for the True Equating Transformation in the Context of Local Equating     

Jorge González B.  Matthias von Davier 《Journal of Educational Measurement》2013,50(3):315-320

Based on Lord's criterion of equity of equating, van der Linden (this issue) revisits the so‐called local equating method and offers alternative as well as new thoughts on several topics including the types of transformations, symmetry, reliability, and population invariance appropriate for equating. A remarkable aspect is to define equating as a standard statistical inference problem in which the true equating transformation is the parameter of interest that has to be estimated and assessed as any standard evaluation of an estimator of an unknown parameter in statistics. We believe that putting equating methods in a general statistical model framework would be an interesting and useful next step in the area. van der Linden's conceptual article on equating is certainly an important contribution to this task.  相似文献   

Reciprocal learning in partnership practice: an exploratory study of a home visiting program for mothers with depression     

Matthias Finger 《Studies in Continuing Education》2013,35(2):99-106

The paper proposes that the function and meaning of adult learning has significantly changed since the times the ‘founding fathers’ outlined a philosophical framework for adult education. And already for them the philosophy of conventional education never really seemed adequate. Likewise, a philosophy of adult education today–which is badly needed ‐‐ can no longer be derived from the philosophy of conventional education, and must be elaborated from bottom‐up, i.e. by understanding themeaning of learning for adult learners today as well as the function of adult learning in present society.  相似文献   

Personal belief in a just world, experience of teacher justice, and school distress in different class contexts     

Felix Peter  Claudia Dalbert  Nils Kloeckner  Matthias Radant 《European Journal of Psychology of Education - EJPE》2013,28(4):1221-1235

The study examined the meaning of personal belief in a just world and students’ experience of their teachers’ behavior toward them personally for school distress in different class contexts. The study involved 827 secondary school students from 61 classes (grades 9 to 11). Analyses revealed that the more the students believed in a personal just world, the more they felt their teachers’ behavior toward them personally to be just, and the less school distress they experienced; the association between belief in a just world (BJW) and school distress was partly mediated by students’ personal experience of teacher justice. These associations were stable across school tracks, schools, and classes. According to these results and the just world theory, a strong BJW seems to function as a rather context-independent personal resource for students, explaining their individual experience of teacher justice and school distress. Moreover, teacher justice seems to be a key feature of schools explaining students’ well-being at school.  相似文献