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81.
Eline van der Kruk Marco M. Reijne Bjorn de Laat DirkJan Veeger 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(5):527-538
This study performed an analysis of the push-off forces of elite-short-track speed skaters using a new designed instrumented short-track speed skate with the aim to improve short-track skating performance. Four different skating strokes were distinguished for short-track speed skaters at speed. The strokes differed in stroke time, force level in both normal and lateral directions, and the centre of pressure (COP) on the blade. Within the homogeneous group of male elite speed skaters (N = 6), diversity of execution of the force patterns in the four phases of skating was evident, while skating at the same velocities. The male participants (N = 6) with a better personal record (PR) kept the COP more to the rear of their blades while hanging into the curve (r = 0.82, p < 0.05), leaving the curve (r = 0.86, p < 0.05), and entering the straight (r = 0.76, p < 0.10). Furthermore, the male skaters with a better PR showed a trend of a lower lateral peak force while entering the curve (r = 0.74, p < 0.10). Females showed a trend towards applying higher body weight normalised lateral forces than the males, while skating at imposed lower velocities. 相似文献
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Twelve endurance athletes and six power athletes performed fatiguing isokinetic knee flexions/extensions. Isokinetic torque was recorded during the exercise. Isometric torque, cortisol and lactate responses, electromyographic (EMG) mean power frequency, average rectified value, and conduction velocity were analysed before and after the isokinetic exercise to determine correlations between electrophysiological variables and mechanical performances and/or blood concentrations of biomarkers in the two groups of athletes. The EMG variables were estimated from signals recorded from the vastus lateralis in both voluntary and electrically elicited isometric contractions. Power athletes recorded higher values than endurance athletes for the following variables: pre-exercise isometric maximal voluntary contraction (MVC), isokinetic MVC, rate of mechanical fatigue during isokinetic contractions, pre - post exercise variations and recovery times of conduction velocity and mean power frequency, and lactate concentrations. Moreover, conduction velocity overshooting was observed in endurance athletes during the recovery phase after exercise. The correlation analyses showed that the higher the rate of mechanical fatigue, the higher the lactate production and the reduction in conduction velocity due to the exercise. 相似文献
84.
Bernardi E Delussu SA Quattrini FM Rodio A Bernardi M 《Journal of sports sciences》2007,25(10):1153-1160
This research, which was conducted with crew members of an America's Cup team, had the following objectives: (a) to assess energy expenditure and intake during training; (b) to evaluate the sailors' diet, and (c) to identify any dietary flaws to determine the appropriate intake of nutrients, correct possible dietary mistakes, and improve their food habits. Energy expenditure was estimated on 15 sailors using direct measurements (oxygen consumption) and a 3-day activity questionnaire. Oxygen consumption was measured on sailors during both on-water America's Cup sailing training and dry-land fitness training. Composition of the diet was estimated using a 3-day food record. Average daily energy expenditure of the sailors ranged from 14.95 to 24.4 MJ, depending on body mass and boat role, with the highest values found in grinders and mastmen. Daily energy intake ranged from 15.7 to 23.3 MJ (from +6% to -18% of energy expenditure). The contributions of carbohydrate, protein, and fat to total energy intake were 43%, 18%, and 39% respectively, values that are not in accord with the recommended guidelines for athletes. Our results show the importance of assessing energy balance and food habits for America's Cup sailors performing different roles. The practical outcome of this study was that the sailors were given dietary advice and prescribed a Mediterranean diet, explained in specific nutrition lectures. 相似文献
85.
Physiological characteristics of America's Cup sailors 总被引:2,自引:0,他引:2
Bernardi M Quattrini FM Rodio A Fontana G Madaffari A Brugnoli M Marchetti M 《Journal of sports sciences》2007,25(10):1141-1152
The aim of this study was to assess the physiological profile of America's Cup grinders and mastmen, by measuring energy expenditure during sailing and assessing their aerobic and anaerobic fitness. The study focused on estimating the energy used during grinding activity, by measuring oxygen uptake (VO(2)) during sail setting in real sailing conditions. In the laboratory, using an arm-cranking ergometer, we measured VO(2peak) during an incremental maximal exercise test and total energy expended during the effort and recovery phases of an all-out test that simulated grinding activity, in six grinders and mastmen and ten sailors of the same crew. Total energy used during grinding corresponded to 45% (s = 9) and 51% (s = 5) of that used in the all-out test (234 kJ, s = 21.7) for tacks and gybes, respectively. In both grinding activity and the all-out test, VO(2) increased during and after the effort. The "VO(2) top value" was 53% (s = 8.6), 68% (s = 5.5), and 78% (s = 3.1) of VO(2peak) (4.7 l . min(-1), s = 0.43) in tacks, gybes, and the all-out test, respectively. During fast sequences of grinding activity, the "VO(2) top value" reached 65% (s = 7.1) VO(2peak) in tacks and 91% (s = 3.3) VO(2peak) in gybes. Our results suggest that grinders and mastmen are characterized by a high anaerobic capacity but their performance can be improved by powering aerobic fitness, to increase this energy contribution to all-out efforts and to guarantee fast recovery when grinding activity is repeated with short rest intervals. 相似文献
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89.
Between Pragmatism and Legitimacy: Developments and dilemmas in teacher education in The Netherlands
In this paper, we describe how the shortage of teachers accelerates the development of Dutch teacher education in a more competence- and school-based direction. We address three themes. First, we note that Dutch teacher education institutes are taking initiatives to develop competence-based curricula and assessment. However, until now these developments have had a weak foundation. Secondly, it is clear that schools are developing and carrying out teacher improvement plans, but that student teachers are seldom part of these plans. Thirdly, the teacher educators in schools cannot meet the professional standards yet. Teacher educators in teacher education institutes also need time and support to adapt to new circumstances. However, there are promising developments in the right direction. Notre paper analyse les conséquences de la pénurie d'enseignants sur la formation des professeurs aux Pays-Bas. Cette formation est de plus en plus tournée vers l'école et s'oriente davantage dans une direction qui privilégie la compétence. Dans une première partie, nous constatons qu'aux Pays-Bas les instituts de formation des enseignants prennent des initiatives pour développer des programmes et des contrôles basés sur les compétences. Pour l'instant cependant, les fondements de cette évolution restent encore assez fragiles. Deuxièmement, on se rend compte que les écoles développent et mettent en place des projets d'amélioration de la profession d'enseignant, mais ceux qui forment les étudiants collaborent rarement à ces projets. Troisièmement, les formateurs d'enseignants dans les écoles ne peuvent pas encore satisfaire au niveau professionnel que l'on veut atteindre. Les formateurs des enseignants dans les instituts de formation pour enseignants ont aussi besoin de temps et de soutien pour s'adapter àla nouvelle situation. Pourtant, il y a des progrès et l'on va dans la bonne direction. En este artículo describimos cómo la escasez de profesores está acelerando en Holanda un proceso en el que la formación de profesores se basa cada vez más en las competencias y en el que hay una mayor participación de las escuelas. Abordamos tres temas. En primer lugar, constatamos que los centros de formación de profesores en Holanda están tomando iniciativas para elaborar evaluaciones y currículos basados en las competencias. Sin embargo, hasta ahora estas iniciativas no han tenido una base sólida. En segundo lugar, está claro que las escuelas, por su parte, están elaborando y ejecutando planes para mejorar el nivel de los profesores, pero que los profesores en formación rara vez forman parte de esos planes. En tercer lugar, los formadores de profesores en las escuelas no pueden cumplir aún las normas profesionales y los formadores de profesores en los centros de formación también necesitan tiempo y apoyo para adaptarse a las nuevas circunstancias. Sin embargo, existen signos prometedores de mejoramiento de estos aspectos. In diesem Artikel beschreiben wir, dass der Lehrermangel die Entwicklung einer Ausbildung von niederländischen Lehrern in eine mehr kompetenz- und schulbezogene Richtung beschleunigt. Wir beschäftigen uns mit drei Themen: Erstens sehen wir, dass die Lehrerausbildungsinstitute der Niederlande Initiativen zur Entwicklung von kompetenzbezogenen Curricula und zur Erfolgsbewertung ergreifen. Bis jetzt haben diese Entwicklungen allerdings ein schwaches Fundament. Zweitens ist klar, dass Schulen Professionalisierungspläne entwickeln und ausführen. Die Praktikanten sind jedoch selten in diese Pläne einbezogen. Drittens können die Lehrerausbilder in Schulen den akademischen Normen noch nicht Genüge leisten. Lehrerausbilder in Lehrerausbildungsinstitute brauchen auch Zeit und Unterstützung, um sich neuen Verhältnissen anzupassen. Es gibt jedoch vielversprechende Entwicklungen in die richtige Richtung. 相似文献
90.
This study reports an intervention to initiate environmental learning and facilitate pro-environmental behaviour. The purpose was to examine the impact of ambient learning displays on energy consumption and conservation at the workplace, more specifically the evaluation of learning outcome and behaviour change. Using a quasi-experimental design, the empirical study was conducted among employees working at a university campus. For the experimental treatments, ambient learning display prototypes were varied on two design dimensions, namely representational fidelity and notification level. The results do not provide clear evidence that the design of the displays influences learning outcome or that the displays lead to pro-environmental behaviour change. Nevertheless, the sole deployment of the display prototypes eased the comprehension of the information provided and lowered the need for additional information. Thus, ambient learning displays provide a promising framework in the context of environmental learning and beyond. 相似文献