Kinesiology/Biomechanics: Perspectives and Trends     

Anne E. Atwater 《Research quarterly for exercise and sport》2013,84(1):193-218

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Effects of inertia correction and resistive load on fatigue during repeated sprints on a friction-loaded cycle ergometer     

Gregory Bogdanis  Aggeliki Papaspyrou  Henryk Lakomy  Mary Nevill 《Journal of sports sciences》2013,31(13):1437-1445

Abstract

Seven 6 s sprints with 30 s recovery between sprints were performed against two resistive loads: 50 (L50) and 100 (L100) g · kg^?1 body mass. Inertia-corrected and -uncorrected peak and mean power output were calculated. Corrected peak power output in corresponding sprints and the drop in peak power output relative to sprint 1 were not different in the two conditions, despite the fact that mean power output was 15–20% higher in L100 (P < 0.01). The effect of inertia correction on power output was more pronounced for the lighter load (L50), with uncorrected peak power output in sprint 1 being 42% lower than the corresponding corrected peak power output, while this was only 16% in L100. Fatigue assessed by the drop in uncorrected peak and mean power output in sprint 7 relative to sprint 1 was less compared with that obtained by corrected power values, especially in L50 (drop in uncorrected vs. corrected peak power output: 13.3 ± 2.2% vs. 23.1 ± 4.1%, P < 0.01). However, in L100, the difference between the drop in corrected and uncorrected mean power output in sprint 7 was much smaller (24.2 ± 3.1% and 21.2 ± 2.7%, P < 0.01), indicating that fatigue may be safely assessed even without inertia correction when a heavy load is used. In conclusion, when inertia correction is performed, fatigue during repeated sprints is unaffected by resistive load. When inertia correction is omitted, both power output and the fatigue profile are underestimated by an amount dependent on resistive load. In cases where inertia correction is not possible during a repeated sprints test, a heavy load may be preferable.  相似文献   

Cardiovascular and Ventilatory Responses during Formalized T'ai Chi Chuan Exercise     

Dale D. Brown  W. Gregory Mucci  Ronald K. Hetzler  Ronald G. Knowlton 《Research quarterly for exercise and sport》2013,84(3):246-250

Abstract

T'ai Chi Chuan (TCC) is a widely practiced Chinese martial art said to physically develop balance and coordination as well as enhance emotional and mental health. TCC consists of a series of postures combined into a sequential movement providing a smooth, continuous, low-intensity activity. The purpose of this study was to examine the ventilatory and cardiovascular responses to the Long Form of Yang's style TCC. In addition, the subjects' TCC responses were compared to their ventilatory and cardiovascular responses during cycle ergometry at an oxygen consumption (VO₂) equivalent to the mean TCC VO₂ Six experienced (M = 8.3 yrs) male TCC practitioners served as subjects with data collected during the Cloud Hand movement of the TCC exercise. Significantly (p < .05) lower responses for ventilatory frequency (Vf) (11.3 and 15.7 breaths min^?1), ventilatory equivalent (VE!VO₂) (23.47 and 27.41), and the ratio of dead space ventilation to tidal volume (VD!VT) (20 and 27%) were found in TCC in comparison to cycle ergometry. The percentage of minute ventilation used for alveolar ventilation was significantly higher during TCC (p < .03) than cycle ergometry, with mean values of 81.1% and 73.1%, respectively. Cardiac output, stroke volume, and heart rate were not significantly different between TCC exercise and cycle ergometry at the same oxygen consumption. We concluded that, during TCC, expert practitioners show significantly different ventilatory responses leading to more efficient use of the ventilatory volume than would be expected from comparable levels of exertion on a cycle ergometer.  相似文献   

Conference communications     

Anis Chaouachi  Matt Brughelli  Gregory Levin  Nahla Ben Brahim Boudhina  John Cronin  Karim Chamari 《Journal of sports sciences》2013,31(2):151-174

Abstract

The objective of this study was to provide anthropometric, physiological, and performance characteristics of an elite international handball team. Twenty-one elite handball players were tested and categorized according to their playing positions (goalkeepers, backs, pivots, and wings). Testing consisted of anthropometric and physiological measures of height, body mass, percentage body fat and endurance ([Vdot]O_2max), performance measures of speed (5, 10, and 30 m), strength (bench press and squat), unilateral and bilateral horizontal jumping ability, and a 5-jump horizontal test. Significant differences were found between player positions for some anthropometric characteristics (height and percentage body fat) but not for the physiological or performance characteristics. Strong correlations were noted between single leg horizontal jumping distances with 5-, 10-, and 30-m sprint times (r = 0.51–0.80; P < 0.01). The best predictors of sprint times were single leg horizontal jumping with the dominant leg and the distance measured for the 5-jump test, which when combined accounted for 72% of the common variance associated with sprint ability. In conclusion, performance abilities between positions in elite team-handball players appear to be very similar. Single leg horizontal jumping distance could be a specific standardized test for predicting sprinting ability in elite handball players.  相似文献   

Longitudinal antecedents of executive function in preschoolers     

Conway A  Stifter CA 《Child development》2012,83(3):1022-1036

Despite an extensive history underscoring the role of social processes and child contributions to the development of executive functions (C. Lewis & J. Carpendale, 2009; L. S. Vygotsky, 1987), research on these relations is sparse. To address this gap, 68 mother-child dyads were examined to determine whether maternal attention-directing behaviors (attention maintaining, attention redirection) and toddlers' temperament predicted executive processes during preschool (mean age = 4.5 years, SD = 0.46)-delay and conflict inhibition. Maternal attention maintaining was associated with high levels of conflict inhibition for inhibited and exuberant children, whereas attention redirection was associated with low levels of delay and conflict inhibition for inhibited children. Therefore, maternal attention-directing behaviors may enhance the development of executive functions but only for children with inhibited and exuberant temperaments.  相似文献   

Solving complex problems: A convergent approach to cognitive load measurement     

Robert Zheng  Anne Cook 《British journal of educational technology : journal of the Council for Educational Technology》2012,43(2):233-246

The study challenged the current practices in cognitive load measurement involving complex problem solving by manipulating the presence of pictures in multiple rule‐based problem‐solving situations and examining the cognitive load resulting from both off‐line and online measures associated with complex problem solving. Forty‐eight participants were recruited from a subject pool in the Educational Psychology department in a large research university in western USA. Results showed that the presence of pictures had no effect on learners' complex problem solving as measured by the response time and accuracy. However, the online measure (eg, pupillometric measures) revealed a change in cognitive load associated with the presence of pictures in complex problem solving. The authors concluded that different measures of cognitive load may actually be measuring separate aspects of cognitive load. Discussions were made on how research on multimedia learning and cognitive load could be advanced by carefully considering multiple aspects of cognitive load and by including the use of convergent measurement techniques to capture the variations of cognitive load involved in learning.  相似文献   

In this issue     

A Bridgman 《Child development》2012,83(5):1465-1470

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IMMANUEL KANT'S ACCOUNT OF COGNITIVE EXPERIENCE AND HUMAN RIGHTS EDUCATION     

Gregory Lewis Bynum 《Educational theory》2012,62(2):185-201

In this essay Gregory Bynum seeks to show that Immanuel Kant's thought, which was conceived in an eighteenth‐century context of new, and newly widespread, pressures for nationally institutionalized human rights–based regimes (the American and French revolutions being the most prominent examples), can help us think in new and appreciative ways about how to approach human rights education more effectively in our own time. Kant's discussion of moral experience features prominently in Bynum's analysis, which emphasizes the following: Kant's conception of a Categorical Imperative to treat humanity as an end in itself; his conscious avoidance of, and his discussion of the necessity of avoiding, the limitations of empiricist and rationalist extremes of thought; and his discussion of moral experience in interrelated individual, community, and global aspects. Bynum demonstrates the usefulness of Kant's approach by using it as a lens through which to appreciatively examine a Japanese‐born university professor's account of her ultimately successful effort to teach American students about U.S.‐instigated human rights violations abroad.  相似文献   

Back to the future: do lessons from Finland point the way to a return to model schools for Northern Ireland?     

Anne Moran  Linda Clarke 《欧洲师范教育杂志》2012,35(3):275-288

The paper examines the school-based element of initial teacher education (ITE) and the ways in which it contributes to the professional learning of student teachers in Finland (University of Helsinki) and Northern Ireland (University of Ulster). In particular it seeks to assess the potential of Training Schools for Northern Ireland. Universities in Finland that provide teacher education have at least one designated training school in which all student teachers have the opportunity to undertake a practicum. The Finnish model was selected for comparison because of the country’s consistently excellent results in the OECD’s Programmes for International Student Assessment which is undoubtedly due, in part, to the quality of the teachers. Teaching/training schools have featured prominently in recent reviews of teacher education in England and Scotland and, while not specifically mentioned in the Northern Ireland (NI) review document, the overall concept could enrich the school-based element of ITE in NI, using existing collaborative networks of schools.  相似文献   

Reforming teacher education in the context of lifelong learning: the case of the BEd degree programme in Ireland     

Anne M. Dolan 《欧洲师范教育杂志》2012,35(4):463-479

Lifelong learning has become a prominent fixture in educational policy in recent years in many countries around the world. In terms of teacher education, it is now widely accepted that initial teacher education is insufficient for the lifelong professional needs of teachers. From September 2012, initial teacher education in Ireland will be offered as a radically different four-year BEd degree programme. This reform of initial teacher education offers immense potential for teacher educators to re-imagine their programmes in light of a range of guiding paradigms and theoretical frameworks, including lifelong learning. This paper provides a rationale for developing programmes in initial teacher education in the context of lifelong learning. A number of recommendations for lifelong primary teacher education are offered in light of current reforms that are taking place in Ireland.  相似文献