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Effect of speed on local dynamic stability of locomotion under different task constraints in running
《European Journal of Sport Science》2013,13(8):791-798
AbstractA number of studies have investigated effects of speed on local dynamic stability of walking, although this relationship has been rarely investigated under changing task constraints, such as during forward and backward running. To rectify this gap in the literature, the aim of this study was to investigate the effect of running speed on local dynamic stability of forward and backward running on a treadmill. Fifteen healthy male participants took part in this study. Participants ran in forward and backward directions at speeds of 80%, 100% and 120% of their preferred running speed. The three-dimensional motion of a C7 marker was recorded using a motion capture system. Local dynamic stability of the marker was quantified using short- and long-term largest finite-time Lyapunov exponents (LyE). Results showed that short-term largest finite-time LyE values increased with participant speed meaning that local dynamic stability decreased with increasing speed. Long-term largest finite-time LyEs, however, remained unaffected as speed increased. Results of this study indicated that, as in walking, slow running is more stable than fast running. These findings improve understanding of how stability is regulated when constraints on the speed of movements is altered. Implications for the design of rehabilitation or sport practice programmes suggest how task constraints could be manipulated to facilitate adaptations in locomotion stability during athletic training. 相似文献
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运用文献资料、录像解析、数理统计等方法,对国家男子足球队与比赛对手相同位置运动员的跑动距离进行了比较分析,结果发现:1)与比赛对手相同位置运动员相比,国家男子足球运动员在跑动总距离上均少于比赛对手。2)在各级跑速的跑动距离上,守门员中速跑的跑动能力显著优于比赛对手;边后卫高速跑的跑动能力显著优于比赛对手;中前卫慢跑以下的跑动能力明显多于比赛对手,而低速跑的跑动能力明显少于比赛对手。3)高强度的跑动能力,尤其是冲刺跑的跑动能力较差,是国家男子足球运动员与比赛对手体能水平的差距所在。 相似文献
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运用运动生理学原理,通过对足球运动员比赛中肌肉活动状况的测定。分析足球运动员奔跑能力的供能机制,从而为选择足球运动员速度耐力的有效训练手段和方法提供一些生理学的依据。 相似文献
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目的:为提高训练和比赛中外部负荷监控的准确性,采用场地测试的方法,研制出适合我国U13~U18岁男子足球运动员体能特征的跑动速度区间。方法:在文献分析的基础上,选取最大冲刺速度(maximal sprint speed,MSS)、最大有氧速度(maximal aerobicpeed,MAS)、无氧速度储备(anaerobic speed reserve,ASR)作为构建跑速区间的体能指标参数,并对218名U13~U18岁男子足球运动员进行40 m冲刺跑和Yo-Yo IR1测试。结果:不同年龄段球员的MSS和MAS均呈现出显著性差异(F=65.28,P<0.01;F=39.95,P<0.01)。不同年龄段球员被聚类为2个年龄组(Silhouette Coefficient=0.6>0.5),其中,U13~U14年龄组走慢跑为0~8.3 km/h,低速跑为8.3~10.7 km/h,中速跑为10.7~13.2 km/h,快速跑为13.2~16.5 km/h,高速跑为16.5~20.0 km/h,冲刺跑为20 km/h以上;U15~U18年龄组走慢跑为0~9 km/h,低速跑为9.0~11.7 km/h,中速跑为11.7~14.4 km/h,快速跑为14.4~18.0 km/h,高速跑为18.0~21.9 km/h,冲刺跑为21.9 km/h以上。结论:研究所构建的跑动速度区间具有较佳的理论依据和适用性,可以更客观、精确地提高男子青少年足球运动队日常训练、比赛中外部负荷的监控水平。 相似文献
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足球之美来自球员的身体动作体系。球员在赛场上的射门的动作很像杂技,球员带球突破时的速率变化则类似径赛中的变速跑,球员在竞技过程中的空中转体争球之类的动作又很像体操。这些动作展示出人类在进化过程中的可逆性试验价值。在观剧学的视野上考量,足球的动作感比现代电影工业中的动作片更为丰富,且充满了不可知性。足球的超体育价值即体现于此。 相似文献
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归化外籍球员是诸多国家发展本国足球的重要手段。中国足球归化外籍球员既是建设体育强国、发展体育产业、构建中国特色足球文化的需要,也是适应国际足坛发展趋势、借鉴亚洲足球强国成功经验“冲出亚洲”的需要。归化球员可在短期内提升中国足球的国际竞争力,逐步补齐体育强国建设中竞技体育项目的结构性短板,推动中国联赛走向繁荣,促进体育产业发展,同时,产生一定的“鲇鱼效应”,刺激本土老球员的“求生”本能,带动本土年轻球员成长,吸引更多青少年投身足球运动,夯实中国青训体系。在归化外籍球员过程中,应维护《国籍法》的安定性,坚持“一人一籍”的基本原则不动摇,同时推动3种归化模式协同并进,注重培养归化球员的文化认同,加强顶层设计,谨慎选择归化对象。 相似文献
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目的：通过对上海女足2012年联赛中比赛活动特征的分析,了解上海女足比赛中的跑动特点及体能状况;通过与国内最高水平比赛、国家队及其他世界强队的对比分析,了解与高水平运动队之间的差距,寻找到上海女足训练的突破点,为上海女足在第12届全运会中夺取金牌提供有效的科技支撑.方法：通过已取得专利的自主研发的足球训练负荷监控系统对上海女足2012年联赛上海赛区上海—大连、上海—长春的两场比赛进行跑动负荷的测试.结果：（1） 2012年联赛期间上海赛区的比赛与国外高水平运动队相比,上海女足运动员高速跑和冲刺跑的距离及所比重偏少.（2）上海女足在2012年联赛中不同位置运动员在比赛中整体跑动能力存在差异,边后卫和中场球员总跑动距离最多,而边前卫和边后卫的高强度及以上跑动距离最多,前锋高强度以上跑动距离最少.（3）上海女足在2012年联赛前准备期高强度的有氧间歇训练不足,导致联赛期间体能贮备不足.结论：我国女足联赛水平较低、对抗性不强,上海女足运动员联赛期间的跑动能力与国内最高水平比赛及世界强队相比存在一定的差距,今后的训练必须加强高强度的有氧间歇训练. 相似文献
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试析足球进攻战术中的接应 总被引：6，自引：0，他引：6
对中国和巴西足球队各4场比赛的进攻接应情况进行技术统计,分析对比材料表明我国足球运动员比赛中接应跑位的现状甚为落后,因此,中国足球队员的无球技术需进一步提高。 相似文献
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运用“简极-茵战K1”智能足球运动表现分析系统采集12名大学生运动员在8场正式足球比赛中的跑动和心率相关指标,量化运动员的外部和内部比赛负荷。结果显示：（1）在外部负荷方面,大学生足球运动员在正式的足球比赛中场均跑动距离（8 464±822） m,其中,慢速跑跑动距离约占39.8%,低速跑跑动距离约占30.2%,高强度跑动距离约占5.1%,场均高强度跑动次数（30±14）次;在内部负荷方面,运动员在比赛中的平均心率为（160±11） 次/分钟,52%的比赛时间处于80%最大心率以上区间,仅有14.5%的比赛时间内处于70%最大心率以下区间。（2）后卫球员的跑动总距离大程度地低于中场（ES=1.2,可能性>95%）和前锋（ES=1.4,可能性>95%）,高强度跑平均间歇时间则中等程度地高于中场（ES=0.6,可能性>75%）和前锋（ES=0.9,可能性>75%）,后卫球员在比赛处于中高强度心率区间的时间比例中等程度地低于中场（ES=1.0,可能性>95%）和前锋（ES=1.1,可能性>75%）。前锋球员在比赛中的最大跑动速度（ES=0.7,可能性>75%）、步行距离（ES=0.8,可能性>75%）、慢速跑跑动距离（ES=0.6,可能性>75%）和中等强度心率区间占比（ES=0.7,可能性>75%）皆中等程度地高于中场球员,而低速跑跑动距离（ES=0.8,可能性>75%）、平均心率（ES=0.6,可能性>75%）和高强度心率区间占比（ES=0.6,可能性>95%）则都中等程度的低于中场球员。 相似文献
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Julie A. Hides Tim Oostenbroek Melinda M. Franettovich Smith M. Dilani Mendis 《Journal of sports sciences》2016,34(24):2303-2311
ABSTRACTLow back pain (LBP) is a common problem in football (soccer) players. The effect of LBP on the trunk and hip muscles in this group is unknown. The relationship between LBP and trunk muscle size and function in football players across the preseason was examined. A secondary aim was to assess hip muscle strength. Twenty-five elite soccer players participated in the study, with assessments conducted on 23 players at both the start and end of the preseason. LBP was assessed with questionnaires and ultrasound imaging was used to assess size and function of trunk muscles at the start and end of preseason. Dynamometry was used to assess hip muscle strength at the start of the preseason. At the start of the preseason, 28% of players reported the presence of LBP and this was associated with reduced size of the multifidus, increased contraction of the transversus abdominis and multifidus muscles. LBP decreased across the preseason, and size of the multifidus muscle improved over the preseason. Ability to contract the abdominal and multifidus muscles did not alter across the preseason. Asymmetry in hip adductor and abductor muscle strength was found between players with and without LBP. Identifying modifiable factors in players with LBP may allow development of more targeted preseason rehabilitation programmes. 相似文献
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第19届世界杯足球赛决赛阶段不同位置运动员比赛跑动特征分析 总被引：2，自引：0，他引：2
采用文献资料调研、数理统计等方法,对2010年第19届世界杯足球赛决赛阶段不同位置运动员的跑动特征进行研究。结果发现,不同位置运动员在跑动距离、有球和无球跑动距离、不同强度跑动时间以及最大跑动速度方面存在显著性差异。建议根据运动员场上位置、角色的不同,采取相应的体能训练方法与手段,以提高体能训练的科学性和针对性。 相似文献
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AbstractThe history and issues surrounding elite football in Japan have been addressed by a number of scholars. However, grassroots football, although fundamental to the development of the code, has rarely been explored in the academic literature. In Japan, the importance of grassroots football has received heightened attention by the Japanese Football Association (JFA) since 2003, with 20% growth in the number of registered players under 12 years old from 2003 (262,956 players) to 2014 (315,178 players) a result of the JFA’s initiatives in this area. Japan is currently one of the most successful countries in Asia in terms of grassroots football development and the JFA won the Asian Football Confederation’s award, namely ‘The Best Member Association of the Year 2013 for Grassroots Football’. This paper explores the key driver behind the development of grassroots football development, namely the 47 Prefectural Football Associations, which provide programmes and technical, physical and promotional services which include activities to increase opportunities, facilities, coach education, elite pathways, and competitions for grassroots football. The paper concludes that the factors which have resulted in the success of Japan’s grassroots football revolve around governance of Prefectural Football Associations, coach education programmes, increased opportunities by clubs, leagues and schools, and collaboration with stakeholders within and outside of Prefectural Football Associations. 相似文献
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Katrine Okholm Kryger Vicky Jarratt Séan Mitchell Steph Forrester 《Journal of sports sciences》2017,35(10):953-959
Comfort has been shown to be the most desired football boot feature by players. Previous studies have shown discomfort to be related to increased plantar pressures for running shoes which, in some foot regions, has been suggested to be a causative factor in overuse injuries. This study examined the correlation between subjective comfort data and objective plantar pressure for football boots during football-specific drills. Eight male university football players were tested. Plantar pressure data were collected during four football-specific movements for each of three different football boots. The global and local peak pressures based on a nine-sectioned foot map were compared to subjective comfort measures recorded using a visual analogue scale for global discomfort and a discomfort foot map for local discomfort. A weak (rs = ?0.126) yet significant (P < 0.05) correlation was shown between the peak plantar pressure experienced and the visual analogue scale rated comfort. The model only significantly predicted (P > 0.001) the outcome for two (medial and lateral forefoot) of the nine foot regions. Subjective comfort data is therefore not a reliable measure of increased plantar pressures for any foot region. The use of plantar pressure measures is therefore needed to optimise injury prevention when designing studded footwear. 相似文献
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基于国际足联颁布"艾尔顿法则"的基础上,对卡塔尔足球"归化+青训"模式的发展历程进行研究,探讨出一条适合于中国足球现状的"中国足球特色归化之路",旨在为我国归化外籍球员及青训的道路提供启示,也为我国足球事业发展提供参考。结果显示:直接归化国外实力强劲球员为本国出战,在短时间内可能会提高成绩,但由于缺少了本国民族认同感,对我国足球的长远发展并无明显促进作用;而归化阿拉伯地区的精英小球员,经本国青训培养,可增加球员的归属感以及文化认同感,在球队实力提升的基础上,还会使归化球员与本土球员之间的关系变得紧密不可分。 相似文献
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点球是现代足球竞赛中的重要技术,对比赛结果具有显著的影响。点球心理研究是足球心理研究中的热点议题。该文从队服颜色效应、罚球员与守门员的非言语行为、罚球员射门策略以及预测罚球员射门区域的先行线索等四个方面对国外足球点球心理研究现状进行了系统回顾与总结,认为每个影响守门员或罚球员的因素均可应用于守门员或罚球员的指导与训练。在对国外研究现状分析的基础上提出了未来的研究方向提高研究的生态学效度与加强质性研究,重视心理干预研究以提升球员的抗压能力。 相似文献
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Tomoya Takabayashi Mutsuaki Edama Masatoshi Nakamura Emi Nakamura Takuma Inai Masayoshi Kubo 《European Journal of Sport Science》2017,17(10):1289-1296
Females, as compared with males, have a higher proportion of injuries in the foot region. However, the reason for this gender difference regarding foot injuries remains unclear. This study aimed to investigate gender differences associated with rearfoot, midfoot, and forefoot kinematics during running. Twelve healthy males and 12 females ran on a treadmill. The running speed was set to speed which changes from walking to running. Three-dimensional kinematics of rearfoot, midfoot, and forefoot were collected and compared between males and females. Furthermore, spatiotemporal parameters (speed, cadence, and step length) were measured. In the rearfoot angle, females showed a significantly greater peak value of plantarflexion and range of motion in the sagittal plane as compared with males (effect size (ES)?=?1.55 and ES?=?1.12, respectively). In the midfoot angle, females showed a significantly greater peak value of dorsiflexion and range of motion in the sagittal plane as compared with males (ES?=?1.49 and ES?=?1.71, respectively). The forefoot peak angles and ranges of motion were not significantly different between the genders in all three planes. A previous study suggested that a gender-related difference in excessive motions of the lower extremities during running has been suggested as a contributing factor to running injuries. Therefore, the present investigation may provide insight into the reason for the high incidence of foot injuries in females. 相似文献
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目的：观察功能性动态拉伸训练对男子足球运动员FMS测试和运动损伤患病率的影响。方法：选择上海U16全运男子足球队队员20名,在男足运动员准备活动中增加为期六周功能性动态拉伸训练计划,前后用FMS测试和评估,并对损伤患病率进行调查。结果：功能性动态拉伸训练计划执行前后FMS测试评分深蹲、跨栏、分蹲、俯卧撑和体旋比较,训练后功能性非常显著改善（P〈0．01）,主动举腿功能性显著改善（P〈0．05）,但肩部柔韧功能未见显著性差异;全队运动损伤患病率由40％降低到24％,未见显著性差异,急性损伤患病率由20％降低到8％,具有显著性差异。结论：用FMS测试对运动员进行功能性测试和评估比较简便科学,由测试结果设计的功能性训练方案在实践应用中可有效降低男子青少年足球运动员的急性运动损伤。 相似文献
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本文以大学生足球运动员为实验对象。分试验组和对照组进行了两阶段60天的60米跑“加阻力牵引训练”,经统计分析,可知这种训练法对提高奔跑能力有积极意义。 相似文献