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61.
Vicente Javier Clemente-Suárez Athanasios Dalamitros João Ribeiro Ana Sousa Ricardo J. Fernandes J. Paulo Vilas-Boas 《European Journal of Sport Science》2017,17(4):425-432
This study analysed the effects of two different periodization strategies on physiological parameters at various exercise intensities in competitive swimmers. Seventeen athletes of both sexes were divided to two groups, the traditional periodization (TPG, n?=?7) and the reverse periodization group (RPG, n?=?10). Each group followed a 10-week training period based on the two different periodization strategies. Before and after training, swimming velocity (SV), energy expenditure (EE), energy cost (EC) and percentage of aerobic (%Aer) and anaerobic (%An) energy contribution to the swimming intensities corresponding to the aerobic threshold (AerT), the anaerobic threshold (AnT) and the velocity at maximal oxygen uptake (vVO2max) were measured. Both groups increased the %An at the AerT and AnT intensity (P?≤?.05). In contrast, at the AnT intensity, EE and EC were only increased in TPG. Complementary, %Aer, %An, EE and EC at vVO2max did not alter in both groups (P?>?.05); no changes were observed in SV in TPG and RPG at all three intensities. These results indicate that both periodization schemes confer almost analogous adaptations in specific physiological parameters in competitive swimmers. However, given the large difference in the total training volume between the two groups, it is suggested that the implementation of the reverse periodization model is an effective and time-efficient strategy to improve performance mainly for swimming events where the AnT is an important performance indicator. 相似文献
62.
In this work an attempt is made to explore the possible value of using Thought Experiments (TEs) in teaching physics to upper
secondary education students. Specifically, a qualitative research project is designed to investigate the extent to which
the Thought Experiment (TE) called ‘Heisenberg’s Microscope’, as it has been transformed by Gamow for the public in his book
Mr. Tompkins in Paperback, can function as a tool in the teaching of the ‘uncertainty principle’. The sample in the research consisted of 40 Greek
students, in 11 groups of 3–4 students each. The findings of this study reveal that the use of this TE has positive results
in teaching the uncertainty principle. Students, based on the TE, were able (i) to derive a formula of the uncertainty principle,
(ii) to explain that the uncertainty principle is a general principle in nature and it is not a result of incompleteness of
the experimental devices and (iii) to argue that it is impossible to determine the trajectory of a particle as a mathematical
line. 相似文献
63.
64.
Based on self-determination theory (Deci & Ryan, 2000), an experimental study with middle school students participating in a physical education task and a correlational study with highly talented sport students investigated the motivating role of positive competence feedback on participants' well-being, performance, and intention to participate. In Study 1, structural equation modeling favored the hypothesized motivational model, in which, after controlling for pretask perceived competence and competence valuation, feedback positively predicted competence satisfaction, which in turn predicted higher levels of vitality and greater intentions to participate, through the mediation of autonomous motivation. No effects on performance were found. Study 2 further showed that autonomous motivation mediated the relation between competence satisfaction and well-being, whereas a motivation mediated the negative relation between competence satisfaction and ill-being and rated performance. The discussion focuses on the motivational role of competence feedback in sports and physical education settings. 相似文献
65.
Holger Busch Jan Hofer Athanasios Chasiotis Domingo Campos 《European Journal of Psychology of Education - EJPE》2013,28(2):239-254
Human behavior is directed by an implicit and an explicit motivational system. The intrinsic form of the implicit achievement motive has been demonstrated to predict the experience of flow. Thus, this achievement flow motive can be considered an integral component of the autotelic personality, posited in Flow Theory as dispositional difference in the propensity to experience flow. As implicit motivation predicts long-term behavioral trends and flow predicts quality of performance, the achievement flow motive should be predictive of a long-term goal pursuit such as educational attainment. This hypothesis is tested cross-culturally to shed some light on the universality of flow: Participants from Cameroon, Costa Rica, and Germany were asked about the level of education they attained. To assess their achievement flow motive, the Operant Motive Test was employed. After measurement equivalence was established, analyses revealed that, across all three cultures, the achievement flow motive explained variance in educational attainment independent of achievement values as measured by a scale of the Schwartz Value Survey. Consequently, as would be expected of an element of the autotelic personality, the achievement flow motive predicts long-term academic success. 相似文献
66.
Anastasia G Beneka Paraskevi K Malliou Victoria Missailidou Athanasios Chatzinikolaou Ioannis Fatouros Vassilios Gourgoulis 《Journal of sports sciences》2013,31(3):335-343
Abstract To determine the time course of performance responses after an acute bout of plyometric exercise combined with high and low intensity weight training, a 3-group (including a control group), repeated-measures design was employed. Changes in performance were monitored through jumping ability by measuring countermovement and squat jumping, and strength performance assessment through isometric and isokinetic testing of knee extensors (at two different velocities). Participants in both experimental groups performed a plyometric protocol consisting of 50 jumps over 50 cm hurdles and 50 drop jumps from a 50 cm plyometric box. Additionally, each group performed two basic weight exercises consisting of leg presses and leg extensions at 90–95% of maximum muscle strength for the high intensity group and 60% of maximum muscle strength for the low intensity group. The results of the study suggest that an acute bout of intense plyometric exercise combined with weight exercise induces time-dependent changes in performance, which are also dependent on the nature of exercise protocol and testing procedures. In conclusion, acute plyometric exercise with weight exercise may induce a substantial decline in jumping performance for as long as 72 hours but not in other forms of muscle strength. 相似文献
67.
Dimitrios Draganidis Athanasios Chatzinikolaou Athanasios Z. Jamurtas Jose Carlos Barbero Dimitrios Tsoukas Apostolos Spyridon Theodorou 《Journal of sports sciences》2013,31(7):714-722
Abstract The purpose of this study was to determine the recovery rate of football skill performance following resistance exercise of moderate or high intensity. Ten elite football players participated in three different trials: control, low-intensity resistance exercise (4 sets, 8–10 repetitions/set, 65–70% 1 repetition maximum [1RM]) and high-intensity resistance exercise (4 sets, 4–6 repetitions/set, 85–90% 1RM) in a counterbalanced manner. In each experimental condition, participants were evaluated pre, post, and at 24, 48, 72 h post exercise time points. Football skill performance was assessed through the Loughborough Soccer Passing Test, long passing, dribbling, shooting and heading. Delayed onset muscle soreness, knee joint range of motion, and muscle strength (1RM) in squat were considered as muscle damage markers. Blood samples analysed for creatine kinase activity, C-reactive protein, and leukocyte count. Passing and shooting performance declined (P < 0.05) post-exercise following resistance exercise. Strength declined post-exercise following high-intensity resistance exercise. Both trials induced only a mild muscle damage and inflammatory response in an intensity-dependent manner. These results indicate that football skill performance is minimally affected by acute resistance exercise independent of intensity suggesting that elite players may be able to participate in a football practice or match after only 24 h following a strength training session. 相似文献
68.
Athanasios Raftopoulos Niki Kalyfommatou Constantinos P. Constantinou 《Science & Education》2005,14(7-8):649-673
The history of science shows that for each scientific issue there may be more than one models that are simultaneously accepted
by the scientific community. One such case concerns the wave and corpuscular models of light. Newton claimed that he had proved
some properties of light based on a set of minimal assumptions, without any commitments to any one of the two models. This
set of assumptions constitutes the geometrical model of light as a set of rays propagating in space. We discuss this model
and the historical reasons for which it had the head-primacy amongst the relevant models. We argue that this model is indispensable
in structuring the curriculum in Optics and attempt to validate it epistemologically. Finally, we discuss an approach for
alleviating the implicit assumptions that students make on the nature of light and the subsequent interference of geometrical
optics in teaching the properties of light related to its wave-like nature. 相似文献
69.
Athanasios Velios 《文物保护研究》2016,61(1):13-25
There is a wealth of conservation-related resources that are published online on institutional and personal websites. There is value in searching across these websites, but this is currently impossible because the published data do not conform to any universal standard. This paper begins with a review of the types of classifications employed for conservation content in several conservation websites. It continues with an analysis of these classifications and it identifies some of their limitations that are related to the lack of conceptual basis of the classification terms used. The paper then draws parallels with similar problems in other professional fields and investigates the technologies used to resolve them. Solutions developed in the fields of computer science and knowledge organization are then described. The paper continues with the survey of two important resources in cultural heritage: the ICOM-CIDOC-CRM and the Getty vocabularies and it explains how these resources can be combined in the field of conservation documentation to assist the implementation of a common publication framework across different resources. A case study for the proposed implementation is then presented based on recent work on the IIC website. The paper concludes with a summary of the benefits of the recommended approach. An appendix with a selection of classification terms with reasonable coverage for conservation content is included. 相似文献
70.
Hoogendijk Kirsten Holland Judith G. Tick Nouchka T. Hofman Adriaan W. H. Severiens Sabine E. Vuijk Patricia Maras Athanasios van Veen Dolf 《European Journal of Psychology of Education - EJPE》2020,35(1):111-135
European Journal of Psychology of Education - The teacher-student relationship plays an important role in the academic and behavioral development of primary school children with externalizing... 相似文献