The effect of ball carrying method on sprint speed in rugby union football players     

Grant SJ  Oommen G  McColl G  Taylor J  Watkins L  Friel N  Watt I  McLean D 《Journal of sports sciences》2003,21(12):1009-1015

Different methods of ball carrying can be used when a player runs with the ball in rugby union. We examined how three methods of ball carrying influenced sprinting speed: using both hands, under the left arm and under the right arm. These methods were compared with running without the ball. Our aim was to determine which method of ball carrying optimizes sprinting speed. Altogether, 48 rugby union players (age 21 +/- 2 years, height 1.83 +/- 0.1 m, body mass 85.3 +/- 12 kg, body fat 14 +/- 5%; mean +/- s) were recruited. The players performed twelve 30-m sprints in total (each player performed three trials under each of three methods of carrying the ball and sprinting without the ball). The design of the study was a form of Latin rectangle, balanced across the trial order for each of the methods and for pairwise combinations of the methods in blocks of four per trial. Each sprint consisted of a 10-m rolling start, followed by a 20-m timed section using electronic timing gates. Compared with sprinting 20 m without the ball (2.58 +/- 0.16 s), using both hands (2.62 +/- 0.16 s) led to a significantly slower time (P < 0.05). Sprinting 20 m with the ball under the left arm (2.61 +/- 0.15 s) or under the right arm (2.60 +/- 0.17 s) was significantly quicker than when using 'both hands' (P < 0.05), and both these methods were significantly slower than when running without the ball (P < 0.05). Accordingly, running with the ball in both hands led to the greatest decrement in sprinting performance, although carrying the ball under one arm also reduced the players' sprinting ability. Our results indicate that to gain a speed advantage players should carry the ball under one arm.  相似文献   

Leisure time physical activity in Australian women: relationship with well being and symptoms   总被引：5，自引：0，他引：5  

Brown WJ  Mishra G  Lee C  Bauman A 《Research quarterly for exercise and sport》2000,71(3):206-216

This paper explores the association between moderate levels of physical activity (PA) and health benefits in well being and symptoms such as tiredness, back pain, and constipation. Participants in the Australian Longitudinal Study on Women's Health, 14,502 young women (ages 18-23 years), 13,609 middle-age women (45-50 years), and 11,421 older women (ages 70-75 years), answered questions about vigorous and less vigorous exercise (used to determine a physical activity score), well being (SF-36), symptoms, and medical conditions. There were significant associations between the PA score and SF-36 in each cohort. Odds ratios (OR) for a range of symptoms and conditions were lower for women who reported low to moderate activity than for sedentary women, for example, for young women or for constipation = 0.76 (CI, 0.65-0.89), for middle-age women or for tiredness = 0.70 (0.63-0.78). There was no threshold of PA at which health benefits increased significantly. Although cross-sectional, the findings suggest that low-to-moderate levels of exercise are associated with a range of health benefits for women of all ages. These preliminary findings will be followed up during the longitudinal study.  相似文献   

POLLING AS A MEANS TOWARD PRESIDENTIAL AUTONOMY: EMIL HURJA, HADLEY CANTRIL AND THE ROOSEVELT ADMINISTRATION     

Eisinger  Robert M.; Brown  Jeremy 《Int. Journal of Public Opinion Research》1998,10(3):237-256

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The Employment of New Full-Time Community College Faculty Members     

James L. Brown 《Clearing house (Menasha, Wis.)》2013,86(8):356-357

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The Problem of Worship Among College Students ∗     

Kenneth Irving Brown 《Religious education (Chicago, Ill.)》2013,108(9):843-848

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Improve Your Classroom Testing Skills     

James S. Taylor 《Clearing house (Menasha, Wis.)》2013,86(9):381-385

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The 2006 Benjamin Franklin Medal in Life Science presented to Fernando Nottebohm, Ph.D. for demonstration of Central Neurogenesis in Adult Avians, with Concomitant Implications for the Theory of Memory and for the Future of Neurological Repair in Injury and Disease     

Janice Taylor Gordon 《Journal of The Franklin Institute》2010,347(4):708-718

Nottebohm is noted for his demonstration of Central Neurogenesis in Adult Avians, with Concomitant Implications for the Theory of Memory and for the Future of Neurological Repair in Injury and Disease.  相似文献   

Understanding conceptual innovation in science     

Harold I. Brown 《Metascience》2010,19(2):273-276

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One third cherokee: Problem solving,teaching, and intuition     

Stephen I. Brown  Gerald R. Rising 《Educational Studies in Mathematics》1978,9(4):391-409

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Bookreviews     

A. D. C. Peterson  Brian Holmes  G. De Landsheere  Helena W. F. Stellwag  Oskar Anweiler  J. O. J. Vanden Bossche  Abraham Robinson  F. I. Calvert  H. H. Stern  J. F. Willatt  Sydney Taylor  M. J. Langeveld  M. A. Brimer  T. N. Postlethwaite  Alexandre Vexliard 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1964,10(1):106-126

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