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排序方式: 共有296条查询结果,搜索用时 15 毫秒
101.
Adrien Sedeaud Andy Marc Julien Schipman Karine Schaal Mario Danial Marion Guillaume 《Journal of sports sciences》2013,31(12):1146-1154
In a context of morphological expansion of the general population, how do athletes follow such a pattern of anthropometric growth? Is there any relation to performance? Biometric data including mass, height, body mass index (BMI) and age were collected for 50,376 American athletes representing 249,336 annual performers playing in professional baseball, football, ice hockey and basketball. Distributions by mass in National Football League (NFL) players are described by periods. Field goals have been studied in relation to players’ height in the National Basketball Association (NBA). Between 1871 and 2011, athletes from the four sports have increased significantly in mass, height and BMI, following a multi-exponential function series. Consequently, biometric differences between athletes and the general population are increasing gradually. Changes in the mass distribution within the NFL show the emergence of a biometrical specificity in relation to the field position. At the professional level, performance remains structured around precise biometric values. In the NBA, a height-attractor at 201.3 ± 6.3 cm for the best scorers is invariant, regardless of the level of play. These results suggest that laws of growth and biometrics drive high-level sport and organise performance around the specific constraint of each field position. Discrepancies between some mass and height developments question the (disproportionate) large mass increase (relative to the height increase) during the 1980s and 1990s. 相似文献
102.
A Comparison of Heart Rate Responses in Females by Player Position in Standard and Zoneless Ringette
Marion Alexander Janice E. Butcher Judy M. Scanlan 《Research quarterly for exercise and sport》2013,84(1):42-49
Abstract The purpose of this study was to examine the relationship between game heart rates by player position during two types of ringette rules: standard rules and experimental rules which did not include zone restrictions (zoneless). Two hundred twenty-five female ringette players (104 standard rules and 121 zoneless rules) were monitored during regular league and tournament play during the 1985 ringette season. This included over 50 games, approximately half played under each set of rules; and included at least five games played in each of five age categories. Field measurement of the game heart rates was conducted by use of an EST Sport-Tester heart rate monitor, which recorded the average of each 30 s heart rate profile. An analysis of variance (ANOVA) with repeated measures was performed to determine the significance of the difference by player position and rules in the mean peak heart rates for six shifts on the ice, the first three and the last three. There were significant differences (p < .05) between mean peak heart rates for forwards and defenders between standard and zoneless rules, but there were no differences between centers. Significance tests were also conducted by position and age division, and the differences in the heart rates of the defenders were significant in the junior belles (13–14) and belles (15–17) age divisions. 相似文献
103.
Marion B. Pollock 《Research quarterly for exercise and sport》2013,84(3):662-667
Abstract A two-part evaluation instrument was developed to assess knowledge and behavior regarding the use of stimulant and depressant substances. A trial instrument was administered to 72 college-bound high school seniors. Analysis of the responses was used to construct a refined second version then administered to 467 men and women at California State College at Long Beach. Analysis of these resulting data showed that the instrument is valid and reliable for use with groups. The instrument may be used (a) to appraise the outcomes of a given instructional program designed to satisfy the usual legal requirement for such instruction, and (b) to serve as a pretest and post-test for determining the effectiveness of specific instruction about the effects of tobacco, alcohol, dangerous drugs, and narcotics. 相似文献
104.
Marion Engin 《欧洲师范教育杂志》2013,36(1):39-54
The purpose of this research was to explore trainer questioning strategies which aimed to scaffold development and learning in teacher training feedback sessions. Research was conducted with a group of Turkish pre-service English teacher trainees at an English-medium university in Turkey. Findings include a categorisation of different question types which seemed to prompt reflection and construction of knowledge. The data also suggest that trainees need varying levels of support through different question types to better scaffold their understanding of teaching. This study concludes with a data-driven framework of questioning strategies which can be a potential guide for trainers working with pre-service English teacher trainees. 相似文献
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Josephine Grigg Eric Haakonssen Evelyne Rathbone Robin Orr Justin W. L. Keogh 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(3):383-401
The aim of this study was to quantify the validity and intra-tester reliability of a novel method of kinematic measurement. The measurement target was the joint angles of an athlete performing a BMX Supercross (SX) gate start action through the first 1.2 s of movement in situ on a BMX SX ramp using a standard gate start procedure. The method employed GoPro® Hero 4 Silver (GoPro Inc., USA) cameras capturing data at 120 fps 720 p on a ‘normal’ lens setting. Kinovea 0.8.15 (Kinovea.org, France) was used for analysis. Tracking data was exported and angles computed in Matlab (Mathworks®, USA). The gold standard 3D method for joint angle measurement could not safely be employed in this environment, so a rigid angle was used. Validity was measured to be within 2°. Intra-tester reliability was measured by the same tester performing the analysis twice with an average of 55 days between analyses. Intra-tester reliability was high, with an absolute error <6° and <9 frames (0.075 s) across all angles and time points for key positions, respectively. The methodology is valid within 2° and reliable within 6° for the calculation of joint angles in the first ~1.25 s. 相似文献
107.
More Effective Consolidation of Episodic Long‐Term Memory in Children Than Adults—Unrelated to Sleep 下载免费PDF全文
Jing‐Yi Wang Frederik D. Weber Katharina Zinke Marion Inostroza Jan Born 《Child development》2018,89(5):1720-1734
Abilities to encode and remember events in their spatiotemporal context (episodic memory) rely on brain regions that mature late during childhood and are supported by sleep. We compared the temporal dynamics of episodic memory formation and the role of sleep in this process between 62 children (8–12 years) and 57 adults (18–37 years). Subjects recalled “what–where–when” memories after a short 1‐hr retention interval or after a long 10.5‐hr interval containing either nocturnal sleep or daytime wakefulness. Although children showed diminished recall of episodes after 1 hr, possibly resulting from inferior encoding, unlike adults, they showed no further decrease in recall after 10.5 hr. In both age groups, episodic memory benefitted from sleep. However, children's more effective offline retention was unrelated to sleep. 相似文献
108.
In this article, we investigate empirically the theoretical split between emphases upon specialist vs trans-specialist knowledge in the organization – or more generally between exploitation and exploration – a split that divides knowledge-flow theory at present, and hence represents an important issue for knowledge management (KM). We review the relevant literature, articulate hypotheses, and employ computational experimentation to test them empirically. Our findings provide novel, insightful understanding of the factors that contribute toward understanding the relative balance between specialist vs trans-specialist knowledge in particular, and exploitation vs exploration more generally. We offer three main contributions: (1) we critique extant theory relating to the substitutability of specialist and interspecialist knowledge; (2) we offer new conceptual insight and empirical evidence concerning substitutability of these knowledge types in the organization; and (3) we demonstrate the empirical power of computational experimentation to examine KM questions of both theoretical and practical interest. 相似文献
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