Changes in respiratory muscle and lung function following marathon running in man     

Ross E  Middleton N  Shave R  George K  Mcconnell A 《Journal of sports sciences》2008,26(12):1295-1301

Respiratory muscle fatigue has been reported following short bouts of high-intensity exercise, and prolonged, moderate-intensity exercise, as evidenced by decrements in inspiratory and expiratory mouth pressures. However, links to functionally relevant outcomes such as breathing effort have been lacking. The present study examined dyspnoea and leg fatigue during a treadmill marathon in nine experienced runners. Maximal inspiratory and expiratory pressure, peak inspiratory and expiratory flow, forced vital capacity, and forced expiratory volume in one second were assessed before, immediately after, and four and 24 hours after a marathon. During the run, leg effort was rated higher than respiratory effort from 18 through 42 km (P < 0.05). Immediately after the marathon, there were significant decreases in maximal inspiratory pressure and peak inspiratory flow (from 118 +/- 20 cm H(2)O and 6.3 +/- 1.4 litres x s(-1) to 100 +/- 22 cm H(2)O and 4.9 +/- 1.5 litres x s(-1) respectively; P < 0.01), while expiratory function remained unchanged. Leg maximum voluntary contraction force was significantly lower post-marathon. Breathing effort correlated significantly with leg fatigue (r = 0.69), but not inspiratory muscle fatigue. Our results confirm that prolonged moderate-intensity exercise induces inspiratory muscle fatigue. Furthermore, they suggest that the relative intensity of inspiratory muscle work during exercise makes some contribution to leg fatigue.  相似文献   

Conceptualising and testing the relationship between actual and perceived motor performance: A cross-cultural comparison in children from Australia and Germany     

Maike Tietjens  Lisa M. Barnett  Dennis Dreiskämper  Benjamin Holfelder  Till Onno Utesch  Natalie Lander 《Journal of sports sciences》2020,38(17):1984-1996

ABSTRACT

Previous studies investigating the relationship between motor skill, physical activity and fitness in children have not thoroughly considered the role of self-perception. Therefore, the study aim was to test a theoretical framework, which considered both actual and perceived motor skill as well as actual and perceived fitness. Potential moderating effects of sex and country were considered. Data on motor skill, fitness, as well as self-perception of motor skill and fitness were collected from 145 Australian children and 214 German children (age range 7 to 10 years). For actual motor skill and fitness, mean differences for sex, age and country were found. For perceived motor performance (perceived motor skill and perceived fitness) no mean differences were found for age. Path analyses were performed. The final model showed significant relations between actual performance (object control skill, fitness) and perceived performance (object control skill, fitness). All model paths had low to moderate regression weights with the lowest relationship reported between actual and perceived fitness. Sex and country showed no effects. This integrated approach has led to a better understanding of the relationship between children’s perceived and objective performance, and cultural differences within them.  相似文献   

The Literacy Skills and Motivation to Read of Children Enrolled in Title I: A Comparison of Electronic and Print Nonfiction Books     

Natalie Conrad Barnyak  Tracy A. McNelly 《Early Childhood Education Journal》2016,44(5):527-536

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The “Mother” of All Schemas: Creating Cognitive Dissonance in Children’s Fantasy Literature Using the Mother Figure     

Einat Natalie Palkovich 《Children‘s Literature in Education》2015,46(2):175-189

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Impact of primary and secondary social origin factors on the transition to university in the Czech Republic     

Natalie Simonová  Petr Soukup 《British Journal of Sociology of Education》2015,36(5):707-728

The main objective of this paper is to show to what extent and why students with the same academic aptitude but different social backgrounds have different odds of entering university. For our analysis, we separated primary and secondary factors of social origin in the formation of educational inequalities. The results show that the primary and secondary factors have approximately the same influence on the transition to university. Czech schools do not affect the process of forming educational aspirations and transition to university, and merely ‘classify’ children according to their social origin. This situation emerged during the socialist era and has remained unchanged after the fall of communism (in 1989). However, the mechanism of the social origin effect has changed – while cultural capital with a ‘direct’ impact had a major role to play during the socialist era, at present there is a rather ‘indirect’ influence through economic capital.  相似文献   

Searching for New Answers: The Application of Task‐Technology Fit to E‐Textbook Usage          下载免费PDF全文

Natalie Gerhart  Daniel A. Peak  Victor R. Prybutok 《Decision Sciences Journal of Innovative Education》2015,13(1):91-111

Students have been slow to adopt e‐textbooks even though they are often less expensive than traditional textbooks. Prior e‐textbook research has focused on adoption behavior, with little research to date on how students perceive e‐textbooks fitting their needs. This work builds upon Task‐Technology Fit (TTF) and Consumer Acceptance and Use of Technology (UTAUT2) theory to present a student‐perspective model of e‐textbook usage. By contextualizing TTF and UTAUT2 to e‐textbooks, the research fills a gap in the literature and provides guidance to researchers and practitioners. The goal of the research is to understand how students perceive their task of learning to fit with e‐textbook technology, and how that fit influences e‐textbook usage and expected performance in their classes. To achieve this goal, the research develops a model to test the relationship between perceived TTF of e‐textbooks and UTAUT2‐defined user characteristics that encourage adoption behaviors, thus facilitating student learning. The findings show that four factors impact a student's perceived TTF: substitution, habit, hedonic motivation, and facilitating conditions. Furthermore, perceived TTF positively correlates with students’ e‐textbook usage and expected performance in classes when using e‐textbooks. While price value exhibits a measurable effect on e‐textbook utilization, it is a minor factor.  相似文献   

Research-informed strategies to address educational challenges in a digitally networked world     

Joke Voogt  Gerald Knezek  Natalie Pareja Roblin 《Education and Information Technologies》2015,20(4):619-623

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A qualitative study of the impact of the London 2012 Olympics on families in the East Midlands of England: lessons for sports development policy and practice     

Chris Mackintosh  Natalie Darko  Zoe Rutherford  Hetty-May Wilkins 《Sport, Education and Society》2015,20(8):1065-1087

The dynamics and culture of families are central to individual and community sport and physical activity participation. This research project examined the lived experiences and day-to-day realities of the London 2012 Olympics from the perspectives of five families in the East Midlands region of England. The aims of the project were to assess the influence the Games had on shaping family sports participation, influencing social and health relationships within the families through sports and reactions to the 2012 Olympics. The study was conducted through the generation of rich qualitative data from pre- and post-Games interviews as well as production of video diary data by the families and young people themselves to gather micro-level information on the realities of ‘legacy’ for families. Findings from this research project illustrate that prior parental socialisation into sport shaped current attitudes to legacy and children and mothers and fathers had mixed reactions to the actual presence of legacy. There are also clear sports development challenges around accessibility, cost, project design, the non-family-friendly nature of some schemes present during the potential consumption of legacy that have consequences for future research in this embryonic area. Implications from the study include the need to locate the family as a more central concern for policy makers in sports development practice. The study has questioned the assumed virtuous legacy of the London 2012 Games from the perspective of families on a day-to-day micro-level. Instead, a far more complex and diverse picture from the perspective of the family has been presented that requires further critical research on this little explored topic of policy and practice in sports development.  相似文献   

How Birth Doulas Help Clients Adapt to Changes in Circumstances,Clinical Care,and Client Preferences During Labor     

Natalie Lea Amram  Michael C. Klein  Heidi Mok  Penny Simkin  Kathie Lindstrom  Jalana Grant 《The Journal of perinatal education》2014,23(2):96-103

This study examined how doulas adapt to challenges in client’s labors. There were 104 Canadian and 92 American doulas who responded to a survey distributed at a doula conference. We report results from open-ended questions in which doulas describe how they manage changes deviating from the mother’s birth plan and how they navigate differences of opinion between themselves and providers. Four themes emerged: giving nonjudgmental support, assisting informed decision making, acting as a facilitator, and issues with advocacy. Although 30% of doulas said that advocacy and information giving could result in conflict with providers, doulas reported working within their scope of practice and striving to be part of the team. Issues in doula responsibility and patient advocacy remain, and ongoing role clarification is needed.  相似文献   

Impact of grade retention and school engagement on student intentions to enrol in higher education in Portugal     

Natalie Nóbrega Santos  Vera Monteiro  Carolina Carvalho 《European Journal of Education》2023,58(1):130-150

Grade retention and inequalities that derive from grade retention can influence student school trajectories and careers. Grade retention can discourage students from education, and increase school failure and dropout. This study explored the relationship between grade retention and student intentions to enrol in higher education. We also studied the role of school identification and behavioural engagement in this relationship. The analysis is based on a sample of 1,089 students (grades 6 to 10) from Portugal, one of the European countries with the highest rates of grade retention. We employed multilevel probit regression modelling with random intercept and fixed slopes to explore both the individual and school level effects of grade retention. The analyses showed that retained students had a lower probability of intent to enrol in higher education and that there was a contextual effect of the number of retained students in the school, on students' probability of intent to enrol in higher education. This association was partially explained at the individual level by students' school identification. Retained students presented lower levels of school identification, which in turn results in lower probabilities of enrolling in higher education. Student behavioural engagement was not associated with grade retention nor student intentions. Our findings suggest the need for interventions that foster students' school identification to overcome the adverse effects of grade retention.  相似文献