Power laws and athletic performance.

In a previous study, we showed that the 1992 men's world record running times in the 100 m to 200 km could be represented accurately by the equation T = cDn, where T is the calculated record time for distance D, and c and n are positive constants. Here, we extend that to cover the years 1925-65 at 10-year intervals and 1970-95 in 5-year intervals for distances of 100 m to 10 km. Values of n for all years lie along a straight line with a small negative slope. A regression analysis yields an equation for values of n covering the period 1925-95. Values of c from 1925 to 1995 were fitted by a quadratic equation. These two equations define a surface in three-dimensional space (log(T), log(D), data) for all men's world record runs over the 70-year period for distances of 100 m to 10 km. We also demonstrated previously that event times, t, do not scatter randomly with respect to the values of T but form a consistent pattern about the straight lines in log(T) versus log(D) plots. In this study, we show that the pattern of (t-T)/t as a function of date has remained constant for the past 70 years.     

Scaling laws and forecasting in athletic world records

In this study, we analysed running world records and found that the mean speed of the race, μ, as a function of the record time, τ, can be described asymptotically by two well-defined scaling laws of the form u ?s τ - β. There is a break in the scaling laws (?1000m) between the shorter and the longer races at a characteristic time of around 150-170 s, after which a new scaling regime emerges. This is the first occasion that this characteristic time has been clearly found in physical terms; we interpreted it as the transition time between the anaerobic and the aerobic energy expenditure of athletes. This phenomenon is independent of the athletes' sex and is also found in swimming races with similar values of the characteristic time. We also investigated the forecasting of world records using historical data. Using an approach based on the identification of non-Poissonian events for a sequence of temporal point processes, we found that the sequence of improvements in all athletic records from 1900 to the present day cannot be considered as a sequence of completely random events.     

山东省体育俱乐部的发展及面临的主要问题

介绍了山东省体育俱乐部的现状、发展进程、类型、作用与地位。山东省体育俱乐部面临的主要问题是：１）权属关系混乱,审批程序不清,不利于其长远发展;２）管理体制不顺,缺乏制度化、规范化和法规化,将影响其健康成长;３）自我发展、自我完善的意识不强,自身造血功能不足,致使部分俱乐部举步维艰。最后提出了推动山东体育俱乐部进一步发展的建议。     

浅论格斗项目供能特点与竞技能力的关系

对格斗项目竞技能力的特征、供能特点以及格斗项目有氧、无氧能力与竞技能力的关系进行了探讨,认为格斗竞技能力是由七个主要因素综合作用的结果;有氧、无氧能力（结合专项特点和专项需要）水平的提高有利于创造优异成绩;良好的有氧能力,有利于提高运动员承担大负荷训练的水平和体能的恢复;无氧能力水平对格斗项目运动员水平的提高也有积极的重要意义。     

Athens 2004: the pollution climate and athletic performance

Athens sits in a basin approximately 450 km² in area, surrounded by mountains and open sea. Anthropogenic emissions in conjunction with the topographical and meteorological conditions can result in high air pollution within the city. The pollutants of concern for athletes competing in Athens 2004 appear to be nitrogen dioxide (NO₂), ozone and particulate (PM₁₀) pollution. Exposure to elevated ozone concentrations has been reported to give rise to symptoms that include cough, chest pain, difficulty in breathing, headache, eye irritation and a decrease in forced expiratory volume in one second. All of these effects are likely to impact upon performance, and several studies of cyclists suggest this to be the case. In contrast, the impact of ambient concentrations of NO₂ appears to be negligible on normal activities, but at high exercise intensities the impact remains unclear. The use of currently available information and models to predict the effect of ozone and other pollutants on elite athletes is problematical, since such models are based upon significantly lower ventilation rates than those achieved by some elite athletes. In addition, it is already known that the response to ozone can vary somewhat between individuals. Since the individuals who will be competing in Athens are physiologically very different to the participants in most published studies, it is difficult to predict individual responses. There is some evidence to indicate that adaptation to the adverse health and performance effects of ozone can occur, so that performance is partially recovered on re-exposure. The adaptation is not seen in all studies and appears to be dependent on several factors, including the initial sensitivity of the individual to ozone. Antioxidant supplementation has also been shown in some studies to partially ameliorate the adverse effects of ozone by counteracting the oxidative stress mechanism associated with this pollutant. Whether this transfers to performance enhancement per se remains unclear at present. Additional research is required to gain a sound understanding of the effects of a complex mixed air pollution exposure on the pulmonary function and performance of athletes exercising at high work intensities.     

我国职业篮球运动员转会制度及相关法律问题

将我国职业篮球联赛与国际上先进的联赛制度进行对比。分析我国当前职业篮球转会制度的优、缺点，对我国职业联赛转会过程中出现的纠纷从法律角度方面进行分析，提出我国的转会制度应加强立法工作。使转会制度趋于职业化、合理化、法制化。     

Defining advantage and athletic performance: The case of Oscar Pistorius

Abstract

Olympic style games were first held for athletes with disabilities in Rome in 1960. Today the Paralympic Games (parallel Olympics) feature competition for athletes from six disability groups, including amputee, visually impaired, and spinal cord injury. Olympic hosts, both summer and winter, are now contractually obliged to organize the Paralympics in the same venue. The size and popularity of the games have grown exponentially since their inception, but they remain largely separate from the Olympics themselves. Recently, a very successful Paralympic athlete from South Africa, Oscar Pistorius, made it clear that despite his double below-the-knee amputation he wanted to compete in his event (400 m) at the Olympics. Initially, however, Oscar Pistorius was prohibited from competing at any International Amateur Athletics Federation (IAAF) competition on grounds of fairness. On the basis of biomechanical and physiological evidence, the IAAF argued that his highly specialized prosthetic limbs gave him an advantage and were therefore in contravention of Rule 144.2. This rule forbids the use of any technical device (such as prosthetic limbs) that provides the user with an advantage over another athlete not using such a device. This decision was subsequently overturned by the Court of Arbitration for Sport following an appeal by Pistorius. Using this case as an example, the aim of this paper is to highlight the empirical and ethical difficulties associated with the application of the principle of fairness in sport. In particular, we discuss both the complexity of identifying the nature and size of athletic advantage and the basis for determining its validity. Moreover, we explore how similar difficulties arise when attempting to establish criteria for “relevant athletic performance”. We argue that reasonable rules and norms for competition are not simply inferred from the principle of fairness. Such rules and norms should result from careful judgements informed by scientific, conceptual, and ethical evidence, and be guided by the standards of excellence that best characterize the sport in question.     

自我设限策略在体育运动中的运用及其对运动表现的影响

试图检验自我效能和自尊是否可以作为两种自我设限策略——声称式的和行为式的——预测指标,并且比较了两种策略和运动表现的关系。以体育学院篮球专业部分新生为研究对象,结果表明:声称式的自我设限策略和自尊显著负相关,而行为式的自我设限策略和自我效能显著负相关。运动表现和行为式的自我设限负相关,和声称式的自我设限不相关。研究结果表明两种自我设限策略和不同的影响因素相联系,并且对运动表现有不同的影响。     

普通高校体育教师课程权力及其实现策略

通过文献资料法,对教师课程权力和普通高校体育教师课程权力的来源进行理论分析;为了合理有效运用教师的课程权力,提出普通高校体育课程教学中应制定与新纲要相配套的课程实施细则、创新教师专业发展的课程体制和提升教师课程素养等实现教师课程权力的策略。     

赛艇运动员的力量素质及其训练方法

本文针对赛艇项目的特点,对赛艇运动员力量素质的特点和影响因素,以及发展赛艇运动员力量素质的训练方法和训练原则进行了探讨。     

Effects of adding a weekly eccentric-overload training session on strength and athletic performance in team-handball players

To investigate the influence of adding a weekly eccentric-overload training (EOT) session in several athletic performance’s tests, 18 team-handball players were assigned either to an EOT (n?=?11) or a Control (n?=?7) group. Both groups continued to perform the same habitual strength training, but the EOT group added one session/week during a 7-week training programme consisting of four sets of eight repetitions for the bilateral half-squat and unilateral lunge exercises. The test battery included handball throwing velocity, maximum dynamic strength (1RM), countermovement jump (CMJ), 20?m sprint, triple hop for distance, and eccentric/concentric power in both the half-squat and lunge exercises. Data were analysed using magnitude-based inferences. Both groups improved their 1RM in the half squat, 20?m sprint time, and CMJ performance to a similar extent, but the EOT group showed a beneficial effect for both right [(42/58/0), possibly positive] and left [(99/1/0), very likely positive] triple hop for distance performance. In addition, the EOT group showed greater power output improvements in both eccentric and concentric phases of the half-squat (difference in percent of change ranging from 6.5% to 22.0%) and lunge exercises (difference in per cent of change ranging from 13.1% to 24.9%). Nevertheless, no group showed changes in handball throwing velocity. Selected variables related to team-handball performance (i.e. functional jumping performance, power output) can be improved by adding a single EOT session per week, highlighting the usefulness of this low-volume/high-intensity training when aiming at optimizing dynamic athletic performance.     

ACTN3 R577X genotype and athletic performance in a large cohort of Japanese athletes

Aim: Recent meta-analyses of the literature confirmed the association between the RR+RX genotype of the ACTN3 R577X polymorphism and elite sprint/power athletic status in Europeans but not in Asians and Africans, while the association between the R577X genotype and elite endurance athlete status is less convincing. The aim of the present study was to investigate the association between the ACTN3 R577X genotype and elite athlete status in a large Asian (Japanese) cohort of track and field athletes. Methods: One-thousand fifty-seven Japanese track and field athletes (627 sprint/power athletes and 430 endurance athletes) and 810 Japanese controls were genotyped for the ACTN3 R577X polymorphism (rs1815739) by using the TaqMan® SNP Genotyping Assay. Results: Elite sprint/power athletes had a higher frequency of the RR+RX genotype than the controls (OR: 1.59, 95% CI: 1.16–2.18; P?=?.003). A significant linear correlation was found between the RR?+?RX genotype and athlete status (i.e. regional?P?=?.001 for trend) and long-distance runners (regional: 65%, national: 72%, international: 82%; P?=?.030 for trend). Conclusions: The data obtained for this large Asian (Japanese) cohort of track and field athletes served to confirm the association between the RR?+?RX genotype of the ACTN3 R577X polymorphism and elite sprint/power athlete status and also the association between the ACTN3 RR?+?RX genotype and long-distance running athletic status.     

Collegiate baseball players with more optimal functional movement patterns demonstrate better athletic performance in speed and agility

Sports injuries are common among baseball players and may result in abnormal movement patterns, increased risks of future injury, and unsatisfactory performance. The Functional Movement Screen (FMS?) has been developed to detect abnormal functional movement patterns and can be used for predicting risks of sports injury. However, whether FMS? scores are associated with athletic performance remains unclear. The goal of this study was to determine the association between functional movements and athletic performance in elite baseball players. Core stability, muscular strength and flexibility of the lower extremities, and FMS?, as well as athletic performance in sprinting, agility, and balance tests were assessed in 52 male collegiate Division I baseball players placed into two groups based on FMS? scores. The high-scoring group demonstrated better athletic performance than the low-scoring group, with a shorter duration of the agility test. No group differences were found in core stability, muscular strength, or muscle flexibility, except for rectus femoris flexibility. Thus, the FMS? score is associated with sprinting and agility performance in elite baseball players. These findings indicate that the FMS? may have a role in predicting athletic performance and thereby help determine the goals of training regimens or return-to-play strategies.     

Contribution of the lower extremity joints to mechanical energy in running vertical jumps and running long jumps

The energy contribution of the lower extremity joints to vertical jumping and long jumping from a standing position has previously been investigated. However, the resultant joint moment contributions to vertical and long jumps performed with a running approach are unknown. metatarsophalangeal joint to these activities has not been investigated. The objective of this study was to determine the mechanical energy contributions of the hip, knee, ankle and metatarsophalangeal joints to running long jumps and running vertical jumps. A sagittal plane analysis was performed on five male university basketball players while performing running vertical jumps and four male long jumpers while performing running long jumps. The resultant joint moment and power patterns at the ankle, knee and hip were similar to those reported in the literature for standing jumps. It appears that the movement pattern of the jumps is not influenced by an increase in horizontal velocity before take-off. The metatarsophalangeal joint was a large energy absorber and generated only a minimal amount of energy at take-off. The ankle joint was the largest energy generator and absorber for both jumps; however, it played a smaller relative role during long jumping as the energy contribution of the hip increased.     

浅析篮球比赛中大前锋的进攻手段和特点

通过查阅文献资料,以及对NBA现役球员加内特、邓肯、巴蒂尔的比赛录像进行观察和分析,阐述了大前锋在篮球比赛中有球进攻和无球进攻时的特点及在进攻中的作用。分析了大前锋在进攻中经常运用的突破、远投、中投、篮下单打、二次进攻、快攻和挡拆等手段,为培养和提高大前锋进攻能力的训练提供理论依据。     

男子健美运动员Heath-Carter体型特征及与肌力的相关性

目的:计算健美运动员Heath-Carter体型三因子值,统计三因子与肌肉力矩及输出功率的相关性,并分析影响因素。方法:确定60名男子健美运动员的体型类型;测量上、下肢及躯干肌的峰值屈、伸力矩;分别以2.5、5、7.5、10、12.5、15%体重比递增负荷完成自行车蹬车运动,记录每种负荷下的最大输出功率。结果:健美运动员体型三因子平均值为4.40-7.21-1.31(0.31-1.07-0.12),坐标值为(-3.11,8.61),属于远离外因子、偏内胚层的中胚层类型。肌肉力矩和输出功率均与内因子不相关,与中因子呈正相关,与外因子呈负相关。结论:中、外因子影响肌肉力矩和功率输出,对肌肉造型起主要作用。由于内因子值较高且与肌肉收缩能力并不相关,提示不宜将健美训练作为减脂的主要手段。     

实施农民体育健身工程与体育强国战略的关系研究

实施农民体育健身工程,大力推进农村体育场地设施建设是构建农村全民健身服务体系的重要内容。建设体育强国要深入开展全民健身运动;提高运动技术水平;大力发展体育产业;深化体育国际交流。实施农民体育健身工程对我国迈向体育强国有着密切关联的影响作用。     

童话世界中的性别与权力--普希金《渔夫和金鱼的故事》解读

《渔夫和金鱼的故事》在其表层的寓意之下,还有性别与权力的象征。童话也是意识形态控制的机器,它将维持和再生产在社会中占支配地位的信念、价值观和规范当作自己的主要任务。童话所生产的知识和审美规范经过了意识形态的反复过滤,把儿童的自然的本能反抗漂柒成顺从。