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way to control it an 《武汉体育学院学报》2006,(8)
r cost and higher performance.Af-ter the emulational practice,we have drawn the conclusion that the system an compensate the weakness of PID control,and it an also prevent 相似文献
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Leon Culbertson 《体育哲学杂志》2017,44(1):1-14
This paper examines one component of Stephen Mumford’s case for the claim that we should regard sport, art and the aesthetic as more closely connected than has tended to be the case, under the influence of the work of David Best, in recent years. Mumford’s rejection of what I call ‘the drama argument’ is examined in detail and it is argued that all but one element of his case fails to do the job he envisages. 相似文献
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ABSTRACTClass-related parenting cultures and ideologies have been of considerable interest to academics over the last two decades. Much of the research thus far has focused on exploring Annette Lareau's conceptualisations of ‘natural growth’ and ‘concerted cultivation’ and the implications for outcomes in relation to education. The focus of the present article is organised activities, which are a central but as yet relatively under-researched feature of middle-class parenting. The findings are based upon 73 semi-structured interviews with parents and children from 48 middle-class families living in and around a small city in northern England. The article reveals that initiating and facilitating children's organised activities is considered a central aspect of ‘good’ parenting in middle-class social networks. It is shown how this is a consequence of several developments within society over the past three decades or so, including the rising levels of maternal employment, the growing competitiveness of the labour market and the increasing concerns related to children's health and safety. It is argued that these developments have heightened middle-class parents’ predisposition to not only be involved with and invest in their children's leisure biographies, but to do so in a more deliberate, rigorous and rational manner. 相似文献
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Pantelis T. Nikolaidis 《Journal of sports sciences》2019,37(12):1387-1392
The present retrospective study intended to determine age, performance, the role of nationality and participation trends across calendar years in runners competing in “Comrades Marathon”, the ultra-marathon with the longest tradition and the highest number of finishers worldwide. We analysed 235,467 finishers (40,211 women and 195,256 men) competing between 1994 and 2017. In women and men, Russians were the fastest (12.55 ± 2.03 km/h and 12.24 ± 2.93 km/h, respectively) and Indians the slowest (7.87 ± 0.64 km/h and 7.91 ± 0.60 km/h) (p < 0.001, η2 = 0.053 and η2 = 0.010, small effect size, ES). Also, Russians were the youngest (33.9 ± 4.6 and 36.3 ± 5.9 years, respectively) and Japanese the oldest (49.3 ± 9.6 and 51.4 ± 12.3 years, respectively) (p < 0.001, η2 = 0.011, small ES). Performance improved (r = 0.90 in women and r = 0.92 in men), age of finishers (r = 0.91 in women and r = 0.97 in men), participation (r = 0.92 in women and r = 0.87 in men) and sex difference in age increased (r = 0.71), whereas men-to-women ratio (r = ?0.91) and sex difference in performance (r = ?0.68) decreased across calendar years (p < 0.001). In summary, runners from Russia were the fastest and the youngest in both sexes. The knowledge of the relationship of nationality with performance, age and participation trends of finishers, and changes across calendar years are of practical importance for ultra-runners and coaches working with them. 相似文献
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Geoffery Z. Kohe 《国际体育史杂志》2013,30(11-12):1378-1394
During the late twentieth century, the United Kingdom’s football infrastructure and spectatorship underwent transformation as successive stadia disasters heightened political and public scrutiny of the game and prompted industry change. Central to this process was the government’s formation of an independent charitable organization to oversee subsequent policy implementation and grant-aid provision to clubs for safety, crowd, and spectator requirements. This entity, which began in 1975 focusing on ground improvement, developed into the Football Trust. The Trust was funded directly by the football pools companies who ran popular low-stakes football betting enterprises. Working in association with the Pools Promoters Association (PPA), and demonstrating their social responsibility towards the game’s constituents, the pools resourced a wide array of Trust activities. Yet irrespective of government mandate, the PPA and Trust were continually confronted by political and economic obstacles that threatened the effectiveness of their arrangements. In this paper the history of the Football Trust is investigated, along with its partnership with the PPA, and its relationship with the government within the context of broader political shifts, stadia catastrophes, official inquiries, and commercial threats. It is contended that while the Trust/PPA partnership had a respectable legacy, their history afforded little protection against adverse contemporary conditions. 相似文献
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Martyn Dean Cooke 《Sport in History》2019,39(1):1-23
During the Victorian era sport underwent what has been described by academics as a ‘revolution’. What began the nineteenth century as largely informal, recreational pastimes with few written rules and a small commercial fringe was transformed into a codified, commercialised, mass-spectator entertainment industry. During this period an inextricable link developed between sport and the press and both became mutually beneficial; sport provided a continuous conveyor belt of content for journalists to report whilst newspapers provided enhanced publicity and exposure in return. However, the press were not merely commentators and observers of sport and several publications took a more central role in its development and organisation. This is exemplified by the Staffordshire Sentinel, a regional newspaper that circulated across North Staffordshire and South Cheshire, which established the self-titled ‘Sentinel Cup’ in 1892. The competition was officially created to develop junior association football in the region, although key stakeholders also had other alternative motives, and it has been contested for 125 consecutive years, making it the longest continuous football cup in Britain. This paper uses the ‘Sentinel Cup’ as an exemplar of how the press became increasingly involved in sport during the Victorian era and explores the competition’s inauguration. 相似文献
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Alfonso Manas 《国际体育史杂志》2013,30(15):1655-1673
AbstractThe origin of the retiarius has always been a mystery for experts, since there seems to be no source that gives reliable information about that question. Some experts have proposed that its origin might be found in the Siege of Tyre (332 BC), when the defenders of that city used tridents and nets to repel the attackers. Yet those same experts also warn that that episode might have more to do with the invention of pontarii fighting (a modality of fighting where the retiarius took part) than with the invention of the retiarius itself, which, according to them, would have been invented before pontarii fighting. Here, I propose the idea that an attempt to re-enact the siege of Tyre around the 30s–20s BC in order to offer a new gladiatorial entertainment might have been the origin of pontarii fighting, and of the retiarius too, since in such a re-enactment, a gladiator would have been given a trident and net to play the role of the defenders of Tyre. Thus, pontarii fighting and the retiarius would have been invented at the same time (30s–20s BC), the latter as a consequence of the former. 相似文献
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Mário Hebling Campos Nayane Martins Giraldi Paulo Gentil Claudio Andre Barbosa de Lira Carlos A. Vieira Marcelo Costa de Paula 《Journal of sports sciences》2017,35(12):1134-1141
This study analysed the behaviour of the geometric curvature of the spine during sirshasana. The position of dorsal retroreflective markers was computed via stereophotogrammetric analysis in six males and five females (29.4 ± 8.8 years, 63.0 ± 11.4 kg, 1.66 ± 0.08 m [average ± standard deviation]). The spinal points were projected onto the sagittal and frontal planes of the trunk, a polynomial was fitted to the data and the two-dimensional geometric curvature was quantified. The inferior lumbar lordosis decreased compared to the orthostatic position and gait, which may favour the posterior protrusion of the lumbar spinal nucleus pulposus in people with posterior herniation. The lateral deviation at the middle of the thoracic spine increases during sirshasana, which may reflect increased difficulties for postural control and spinal loads. It could be useful for promoting positive spinal structural and functional chronic adaptations for healthy participants, if the yoga programme is carefully planned and the spinal alignment is carefully monitored during a headstand. However, it may aggravate some spinal diseases, especially scoliosis. 相似文献
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Juggling People on the Springboard by Shenzhen Fuyong Acrobatic Troupe won the gold medal on the 5th National Youth Acrobatic Contest. As a young private-owned acrobatic troupe founded in 2001, it is the second time for it to win the gold medal on the National Youth Acrobatic Contest. However, it is the 相似文献
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Pascal Charitas 《国际体育史杂志》2015,32(7):909-922
After World War II, the principle of a colonized countries' self-determination was at stake in the international relationships emerging from the context of a Cold War and the decolonizations of Empires. Non-Governmental Organizations such as the International Olympic Committee (IOC) become not only analyzers of the effects of competition between the different colonial powers, but also enlighteners of the imperial strategies which would turn the power struggles into partnership and cooperation. The fear of a political harnessing from the Occidental countries resulted in two reactions: the progressive integration of English-speaking African National Olympic Committees (NOCs) based on a Great Britain-controlled International Federations (1950–1972) and, eventually and as a direct consequence, the creation of French-speaking African NOCs (1956–1968) through the International Olympic Aid Commission (1961). From 1944 to 1963, conditions for possibility seemed to be gathered for the realization of a process of internationalization of African sport through the integration of new English- and French-speaking African countries into the IOC. 相似文献
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Ric Jensen 《Soccer & Society》2014,15(5):720-731
This essay describes some of the legendary accomplishments of the Netherlands football team in the World Cup and other international tournaments. It focuses on the Dutch teams led by Johan Cruyff and affectionately known as ‘The Clockwork Orange’ because they introduced a modern style of play with precision passing that was referred to as ‘total football’. The Netherlands advanced to the World Cup final in 1974 and 1978, only to lose the championship each time. The study also explores the role of the Dutch coach Rinus Michels and some of Cruyff’s teammates such as Johan Neeskens and Rob Rensenbrink. Looking at the Netherlands’ performances in the European championships and World Cups in the last three decades, the essay attempts to bring out the transformations in Dutch football in post-Cruyff age. Finally, it discusses the team’s rabid and energized fan base, and the ambush marketing scandal that took place during the 2010 World Cup. 相似文献
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《Sport in History》2013,33(1):3-13
Brutality and violence are, according to many observers, an increasing feature of modern sports. Violence in sport receives publicity through its spectators and the media. Because many forms of sport violence are legitimate, they act as reinforcers, particularly among children and youth. 相似文献
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In tennis, a high ball velocity and a fast run toward the net are key features to successful performance of "serve-and-volley" players. For the serve, tennis players can use two techniques: the foot-up (FU) or foot-back (FB) technique. The aim of this study was to determine if the running time toward the net after the serve and the ball velocity (V(ball)) vary between these two techniques. Moreover we analysed the angular momentum values of the trunk and of the arm holding the racquet. Fifteen expert tennis players performed six successful serve-and-volleys with both techniques. Running time to the net is significantly lower for FB, whereas V(ball) is significantly higher for FU. Trunk and arm angular momentums about the transverse axis are significantly higher with FU before ball impact. A significant correlation (r = 0.81, P < 0.001) exists between changes in the maximal trunk angular momentum and in running time to the net between the two serve techniques. A significant correlation (r = 0.84, P < 0.001) also exists between changes in the maximal trunk angular momentum and in V(ball) between the two serve techniques. According to these results, FB is the best technique for moving as quickly as possible to the net because of a lower trunk angular momentum. 相似文献
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In this study we investigated if the occurrence of the sticking region was a result of diminishing potentiation (coinciding delayed muscle activation) or the result of a mechanically poor region in which the muscles can produce less force. A regular one-repetition maximum (1RM) free-weight bench press was compared with isometric bench presses performed at 12 different positions. A lower force at the sticking region compared to the other regions in the isometric bench presses would confirm the mechanically-poor-position hypothesis. Twelve resistance-trained males (age 21.7 ± 1.3 years, mass 78 ± 5.8 kg, height 1.81 ± 0.05 m) were tested in 1RM and in isometric contractions in bench press in 12 different positions, indicated by the vertical distance between barbell and sternum, covering the whole range of motion during the concentric phase. Barbell kinematics and muscle activity were registered. In both types of executions a region of lower force output was observed, which supports the mechanically-poor-position hypothesis. Electromyographic activity of four muscles showed the same pattern in the isometric and 1RM attempts. It was concluded that diminishing effect potentiation could not explain the existence of the sticking region. 相似文献
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Christoph Triska Bettina Karsten Chris Beedie Bernhard Koller-Zeisler Alfred Nimmerichter Harald Tschan 《European Journal of Sport Science》2018,18(3):332-340
The aim of the study was to determine whether estimates of the speed–duration relationship are affected using different time-trial (TT) field-based testing protocols, where exhaustive times were located within the generally recommended durations of 2–15?min. Ten triathletes (mean?±?SD age: 31.0?±?5.7?years; height: 1.81?±?0.05?m; body mass: 76.5?±?6.8?kg) performed two randomly assigned field tests to determine critical speed (CS) and the total distance covered above CS (D?). CS and D? were obtained using two different protocols comprising three TT that were interspersed by 60?min passive rest. The TTs were 12, 7, and 3?min in Protocol I and 10, 5, and 2?min in Protocol II. A linear relationship of speed vs. the inverse of time (s?=?D??×?1/t?+?CS) was used to determine parameter estimates. Significant differences were found for CS (p?=?0.026), but not for D? (p?=?0.123). The effect size for CS (d?=?0.305) was considered small, while that for D? was considered moderate (d?=?0.742). CS was significantly correlated between protocols (r?=?0.934; p?D? (r?=?0.053; p?=?0.884). The 95% limits of agreement were ±0.28m?s?1 and ±73.9?m for CS and D?, respectively. These findings demonstrate that the choice of exhaustive times within commonly accepted durations results in different estimates of CS and D?, and thus protocols cannot be used interchangeably. The use of a consistent protocol is therefore recommended, when investigating or monitoring the speed–duration relationship estimates in well-trained athletes. 相似文献