Running speed-induced changes in foot contact pattern influence impact loading rate     

Bastiaan Breine  Philippe Malcolm  Samuel Galle  Pieter Fiers  Edward C. Frederick  Dirk De Clercq 《European Journal of Sport Science》2019,19(6):774-783

Purpose. We aimed to determine the effect of speed-induced changes in foot contact patterns on the vertical instantaneous loading rate (VILR). We hypothesized that transition runners, i.e. runners that shift towards a mid- (MF) or forefoot contact pattern (FF) when running speed increases, show smaller increases in VILR than non-transition runners, i.e. runners that remain with a rearfoot contact pattern (RF).

Methods. Fifty-two male and female runners ran overground at 3.2, 4.1, 5.1 and 6.2?m?s^?1. Ground reaction forces, lower limb sagittal plane knee and ankle kinematics and plantar pressures were recorded. Multi-level linear regression models were used to assess differences between transition and non-transition runners.

Results. Non-transition runners experienced larger speed-induced increases in VILR (48.6?±?2.6?BW?s^?1 per m?s^?1) than transition runners (–1.4?±?7.6?BW?s^?1 per m?s^?1). Transition runners showed higher VILRs and a more flat foot touch down at the same pre-transition speed than non-transition runners.

Conclusion. When running speed increases, some runners transition towards more anterior foot contact patterns. This reduces or even eliminates the speed-induced increase in VILR. This result is especially the case for those RF runners who already have relatively high VILRs and flat foot positioning at slower running speeds.  相似文献   

The Edinburgh history of education in Scotland,edited by Robert Anderson,Mark Freeman,and Lindsay Paterson,Edinburgh, Edinburgh University Press, 2015, 384 pp., ISBN 978-0-74867-915-7     

Pieter Dhondt 《Paedagogica Historica: International Journal of the History of Education》2018,54(4):520-523

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Spelling pronunciation and visual preview both facilitate learning to spell irregular words     

Hilte M  Reitsma P 《Annals of dyslexia》2006,56(2):301-318

Spelling pronunciations are hypothesized to be helpful in building up relatively stable phonologically underpinned orthographic representations, particularly for learning words with irregular phoneme-grapheme correspondences. In a four-week computer-based training, the efficacy of spelling pronunciations and previewing the spelling patterns on learning to spell loan words in Dutch, originating from French and English, was examined in skilled and less skilled spellers with varying ages. Reading skills were taken into account. Overall, compared to normal pronunciation, spelling pronunciation facilitated the learning of the correct spelling of irregular words, but it appeared to be no more effective than previewing. Differences between training conditions appeared to fade with older spellers. Less skilled young spellers seemed to profit more from visual examination of the word as compared to practice with spelling pronunciations. The findings appear to indicate that spelling pronunciation and allowing a preview can both be effective ways to learn correct spellings of orthographically unpredictable words, irrespective of age or spelling ability.  相似文献   

Reproducibility, accuracy and concordance of Accutrend Plus for measuring circulating lipid concentration in adults     

Scafoglieri A  Tresignie J  Provyn S  Clarys JP  Bautmans I 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2012,22(1):100-108

Introduction

The determination of lipid biomarkers by capillary sampling may be useful in the screening, diagnosis and/or personal management of hyperlipidemia and cardiovascular risk. It remains unclear whether the use of the Accutrend^® Plus system is appropriate. This study aimed to assess its reproducibility, accuracy and concordance for blood lipid profiling in adults.

Materials and methods:

Fasting capillary total cholesterol (TC) and triglyceride (TG) concentration on Accutrend^® Plus were compared with their venous analogues obtained by a laboratory reference method in sixty-one adults (27 men and 34 women, aged 33.0 years). Supplementary capillary sampling was performed at two consecutive days taking into account macro-nutrient intake.

Results:

The day-to-day reproducibility of the Accutrend^® Plus system proved to be high for TC (ICC = 0.85, P < 0.001), but moderate for TG (ICC = 0.68, P < 0.001). Strong correlations (r ≥ 0.80, P < 0.001) with the reference method were found for TC and TG. Mean difference (limits of agreement) were: 0.26 mmol/L (−0.95, 1.47) for TC, and −0.16 mmol/L (−1.29, 0.98) for TG. The concordance for subject classification according to the National Cholesterol Education Program (NCEP) guidelines was significant (P < 0.001), with substantial agreement for TC (κ_w = 0.67), and moderate agreement for TG (κ_w = 0.50).

Conclusions:

Day-to-day reproducibility of the Accutrend^® Plus device for TC and TG is not optimal and lacks accuracy when compared to the reference laboratory method. The concordance between both methods for classifying subjects according to the NCEP is inadequate. Accutrend^® Plus device should not be interchangeably used as a substitution for the standard laboratory methods in the diagnosis of hyperlipidemia.  相似文献   

Incumbent performance in the face of a radical innovation: Towards a framework for incumbent challenger dynamics     

Shahzad Ansari  Pieter Krop 《Research Policy》2012,41(8):1357-1374

When radical innovations impact an industry, established incumbents are sometimes displaced by new challengers, yet at other times, survive and prosper. What are the factors that influence these possible outcomes? Extensive as the studies are in providing insights into incumbent-challenger dynamics (ICD), the fragmented nature of the literature and the isolated treatment of various constructs at a particular level of analysis, merit a review and analysis. We (1) identify, collate and analyse several constructs from three categories; the industry, the firm and the challenge, (2) discuss the interactions among these constructs and (3) show that incumbent failure or success can be better understood when these constructs are concurrently analysed. We derive several propositions for stimulating research and develop a holistic multi-level framework for understanding incumbent-challenger dynamics. We pull together strategic management theories at the industry level with those at the organizational and inter-organizational levels in the context of disruptive innovations. We contribute by bringing in the challenge dimension across these levels to inform whether an innovation is disruptive in its effects, not just ex post but also ex ante. For illustrative purposes and to concretize our arguments, we draw on both primary data from the Dutch television industry and archival data from four episodes of disruptive innovations.  相似文献   

Happiness disabled: sensory disabilities,happiness and the rise of educational expertise in the nineteenth century     

Pieter Verstraete  Yva Söderfeldt 《Paedagogica Historica: International Journal of the History of Education》2014,50(4):479-493

To date, the historical entanglement of disability and happiness has not been considered an object worth of historical inquiry. Nor has the intersection of disability and emotions been used as a lens to examine the history of disability. Our paper aims at filling this academic void by analysing a wide range of philosophical, anthropological, pedagogical, popular and poetic texts dealing with the following question: “Who is unhappiest, the blind or the deaf?” On the basis of a comparative study of Belgian, Dutch, German, Swiss, Austrian, British and American primary source material, we argue that the transformation of western concepts of happiness during the nineteenth century was reflected in attitudes towards people with sensory disabilities. If at the turn of the eighteenth century happiness was considered a sensory experience, it very soon became dependent on the intervention of an educational expert. On the basis of our source material we draw the conclusion that happiness has been an overlooked factor in the construction and problematisation of disability in western societies. Analysis of the ways in which nineteenth-century authors have dealt with this question also shows how happiness became connected to new ways of wielding power, and in particular to the rise of the educational expert.  相似文献   

Learning basic addition facts from choosing between alternative answers     

Mirte S. van Galen  Pieter Reitsma 《Learning and Instruction》2010,20(1):47-60

The acquisition of addition facts was investigated in a practice study. Participants were 103 Grade 1 children who practiced simple addition problems with three different methods: (a) writing down the answer, (b) choosing between two alternative answers, and (c) filling in the second missing addend. On a test with simple addition problems, children who practiced with the Choice method showed positive transfer: choosing between two answers was about as effective for learning addition facts as the conventional method of writing down the answer. There was no transfer effect for children who practiced with the Missing-Addend method. The results are in accordance with network theories on arithmetic fact learning and specifically the Identical Elements (IE) model of arithmetic fact representation.  相似文献   

Activating the meaning of a word facilitates the integration of orthography: evidence from spelling exercises in beginning spellers     

Maartje Hilte  Pieter Reitsma 《Journal of Research in Reading》2011,34(3):333-345

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What is the better predictor of students’ personal values: Parents’ values or students’ personality?     

Magdalena Bobowik  Jan Pieter van Oudenhoven 《Int J Intercult Relat》2011,35(4):488-498

This study examines the relationship between young adults’ values, multicultural personality traits and their parents’ values. A total of 102 students and their matched parents filled in the Multicultural Personality Questionnaire and the Portrait Value Questionnaire. The influence of one's personality and one's parents’ values on personal values was tested by hierarchical regression analyses and structural equation modelling. The analyses revealed a greater contribution of multicultural personality to the variance in stimulation, self-direction, universalism, and achievement values in comparison to the impact of parents’ values, whereas an opposite pattern was found for power, benevolence, and conformity. Tradition, hedonism, and security were found to be linked to multicultural personality and parents’ values to a similar extent. Furthermore, overall trait-like parents’ values were better predictors of the offspring's trait-like values, and the same effect held for parental societal values: they predicted better the offspring's societal values. The authors discuss the need for differentiation between trait-like and societally oriented values and the application of content-tailored personality measures, in line with previous studies.  相似文献   

Predicting Study Abroad Intentions Based on the Theory of Planned Behavior     

Oliver Schnusenberg  Pieter de Jong  Lakshmi Goel 《Decision Sciences Journal of Innovative Education》2012,10(3):337-361

The emphasis on study abroad programs is growing in the academic context as U.S. based universities seek to incorporate a global perspective in education. Using a model that has underpinnings in the theory of planned behavior (TPB), we predict students’ intention to participate in short‐term study abroad program. We use TPB to identify behavioral, normative, and control beliefs pertinent to the study abroad context. Our research model hypothesizes that intention is predicted by affordability, willingness to pay, and desire. Moreover, willingness to pay is explained by future job prospects, family expectations, and administrative support. We believe that the elements of TBP are reflective of categories of factors that have been demonstrated as important in the context of short‐term study abroad decisions, but that have not been included in previous studies applying TPB to a study abroad context. We test our research model through a survey of 254 undergraduate business students at a southern U.S. university, and find support for all our hypotheses. Results from our study aid in the understanding of students’ decision‐making process to participate in a short‐term study abroad program and have implications for education and learning in the study abroad context. We also contribute to the extant research in TPB by applying it to the context of studying abroad programs and by identifying, and finding support for, a mediated relationship between beliefs and intentions.  相似文献