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81.
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
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I. A. Anderton 《Educational Media International》2013,50(3):4-10
A system is simply a collection of things connected together. Systems thinking refers to the habit of concentrating on how these collections act, and interact, together. Usually we are particularly concerned with how effective they are in the pursuit of certain goals. 相似文献
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I. Ponjaert-Kristoffersen P. Baetens 《International journal for the advancement of counseling》1999,21(3):249-261
The present biomedical model of health care fails to consider the psychosocial aspects of problems of health and illness. Nevertheless, guidance and support through appropriate treatment remains a necessity, especially for patients with chronic and complex diseases. Moreover, information about the disease and its treatment is important with regard to a successful outcome. Health care providers should also pay attention to the psychosocial impact of the disease on the patient, on his or her family and on the wider social context. Counselling infertility patients adds a new dimension to this process: new reproductive technologies offer infertile patients the possibility of setting up a family, but at the cost of turning the parenting wish into a very stressful event. Fertility problems and the fertility treatment itself tend to place a lot of stress on the emotional and sexual relationship of the infertile couple. Although infertile patients focus on such treatments as providing a means to become parents, they should also be able to cope with possible failure. On the other hand, if the treatment succeeds patients should not only be guided through the treatment but also informed about possible psychological and social consequences that might affect them as future parents, their parent-child relationship and the family dynamics. If it is considered that this kind of treatment involves a new life, one might expect psychological counselling to be an essential part of it. 相似文献
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