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101.
Matteo Zago Andrea Gianluca Piovan Isabella Annoni Daniela Ciprandi F. Marcello Iaia 《Journal of sports sciences》2016,34(5):411-419
Dribbling speed in soccer is considered critical to the outcome of the game and can assist in the talent identification process. However, little is known about the biomechanics of this skill. By means of a motion capture system, we aimed to quantitatively investigate the determinants of effective dribbling skill in a group of 10 Under-13 sub-elite players, divided by the median-split technique according to their dribbling test time (faster and slower groups). Foot-ball contacts cadence, centre of mass (CoM), ranges of motion (RoM), velocity and acceleration, as well as stride length, cadence and variability were computed. Hip and knee joint RoMs were also considered. Faster players, as compared to slower players, showed a 30% higher foot-ball cadence (3.0 ± 0.1 vs. 2.3 ± 0.2 contacts · s?1, P < 0.01); reduced CoM mediolateral (0.91 ± 0.05 vs. 1.14 ± 0.16 m, P < 0.05) and vertical (0.19 ± 0.01 vs. 0.25 ± 0.03 m, P < 0.05) RoMs; higher right stride cadence (+20%, P < 0.05) with lower variability (P < 0.05); reduced hip and knee flexion RoMs (P < 0.05). In conclusion, faster players are able to run with the ball through a shorter path in a more economical way. To effectively develop dribbling skill, coaches are encouraged to design specific practices where high stride frequency and narrow run trajectories are required. 相似文献
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Olson Joanne K. Cox-Petersen Anne M. McComas William F. 《Journal of Science Teacher Education》2001,12(3):155-173
Journal of Science Teacher Education - 相似文献
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Recent research has examined the role of vocational-technical training in facilitating the transition from school to work of adolescents with learning disabilities. The present study provided 6-, 12-, and 24-month follow-up data on such students who had attended vocational-technical programs. Matched groups of students without disabilities from vocational-technical programs, as well as randomly selected students without disabilities from regular high schools, were also included for comparisons. Results of the study raised several questions about the value and purpose of vocational-technical training for adolescents with learning disabilities. 相似文献
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What makes marking reliable? Experiments with UK examinations 总被引:2,自引:0,他引:2
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Reading and Writing - The present study investigates the effectiveness of question paraphrases in supporting students’ understanding of a specific task. Secondary school students (i.e.,... 相似文献
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