Correlation analysis of national elite Chinese male table tennis players’ shoulder proprioception and muscle strength

BACKGROUND Shoulder is the most injured part in table tennis players,and it takes multiple roles in transmitting power and striking the center of the ball during the stroke.Proprioception is strongly correlated with high level of athletic performance.It is customary to assume that there is a correlation between proprioception and muscle strength and therefore proprioceptive assessment and rehabilitation is often neglected.AIM To investigate the correlation between isokinetic muscle strength and proprioception in the internal and external rotation muscle groups of elite Chinese male table tennis players,to provide reference for physical training and rehabilitation of elite table tennis players.METHODS A total of 19 national elite table tennis players from the Chinese National Table Tennis Team were recruited in this research.All of them had more than 10 years training experience and had participated major competitions such as the National Games and World Youth Championships.IsoMed 2000 was used to test the peak torque of internal and external rotation isokinetic concentric contraction of the athletes'bilateral shoulder joints at low speed(60°/s)and high speed(180°/s)respectively;IsoMed 2000 was used to conduct the Joint Position Reproduction test to evaluate the athletes'proprioceptive ability capacity at low speed(60°/s)and high speed(180°/s)respectively.If the data satisfied the normal distribution,the correlation between the differences in peak torque s and angles in different directions was analyzed using a Pearson simple linear model;otherwise,Spearman correlation analysis was used.The comparison of proprioceptive ability between the table tennis racket-holding hand and non-racket-holding hands was performed using independent samples t-test if the data satisfied a normal distribution;otherwise,the Mann-Whitney U test was used.RESULTS There was no direct linear correlation between the strength and proprioceptive correlation analysis at slow speed(60°/s)and fast speed(180°/s)in the racket-holding hand;At the slow speed(60°/s)and fast speed(180°/s),there was no correlation between muscle strength and proprioception in the non-racket-holding hand except for the internal rotation variable error(VE)and external rotation relative peak torque,which showed a moderate positive correlation(r=0.477,P<0.05),(r=0.554,P<0.05).The internal rotation’s constant error(CE)and VE were 1.06±3.99 and 2.94±2.16,respectively,for the racket-holding hand,and-3.36±2.39 and 1.22±0.93,respectively,for the non-racket-holding hand;the internal rotation’s CE,VE of the racket-holding hand was lower than that of the non-racket-holding hand,and there was a highly significant difference(P<0.01).CONCLUSION There was no correlation between muscle strength and proprioceptive function in the internal and external rotation of the racket-holding hand’s shoulder in elite Chinese male table tennis players.These results may be useful for interventions for shoulder injuries and for the inclusion of proprioceptive training in rehabilitation programs.

Glycogen and amyloid-beta: key players in the shift from neuronal hyperactivity to hypoactivity observed in Alzheimer's disease?

Introduction：Alzheimer’s disease（AD）begins to develop decades prior to its clinical manifestation（Sperling et al.,2011）,and while it is the most common form of dementia,as of yet there is no cure.Two of the most researched pathological features contributing to disease development are the extracellular amyloid plaques composed of amyloid-beta proteins（Aβ）and neurofibrillary tangles of tau proteins.Another feature of AD is the progression of early neuronal excitability/hyperactivity to silencing/hypoactivity（Palop and Mucke,2010）,

The Distribution of Benefits for Players in Agricultural Industrial Chain

Players of the agricultural industrial chain pursue their own profit maximization,which can lead to conflicts of interest and affect the stability of the industrial chain. Therefore,fair and reasonable profit allocation mechanism is the key to guaranteeing the development and strengthening the strategic alliance relationship between participate members. Shapley model is an effective method to solve the profit distribution in cooperative relations. But it does not consider the three factors: risks faced by players during the operation of the agricultural industrial chain,technology innovation ability,and the degree of participating in the cooperation. So,correction factors are introduced to modify the Shapley value model,in order to make the distribution of benefits more equitable and reasonable,and effectively guide practice.

The Prevalence and Characteristics of Thoracic Outlet Syndrome in High School Baseball Players

Thoracic outlet syndrome (TOS) is one of the common neurovascular disorders of the upper extremities, and the compression or traction of the brachial plexus is the main pathology. We hypothesized that baseball players are more likely to be affected by TOS compared with other overhead-throwing athletes because of strenuous use of their throwing arm. The purpose of this study was to investigate the prevalence and clinical characteristics of TOS in high school baseball players. One thousand two hundred eighty-eight high school baseball players were included in this study. The prevalence of symptomatic TOS and its association to disorders of the upper extremities were investigated. The prevalence of symptomatic TOS was 32.8%. Age- and position-adjusted logistic regression analysis revealed that subjects with symptomatic TOS were at significantly higher risk of shoulder and/or elbow pain (odds ratio [OR]: 1.96, 95% confidence interval [CI]: 1.50 - 2.58) and a higher recurrence rate of shoulder and/or elbow pain during the previous season (OR: 2.38, 95% CI: 1.87 - 3.04). As for physical findings, subjects with symptomatic TOS were also at significantly higher risk of MUCL tenderness (OR: 2.53, 95% CI: 1.83 - 3.50), positive milking maneuver, (OR: 2.63, 95% CI: 1.78 - 3.91), positive subacromial impingement sign (OR: 1.92, 95% CI: 1.20 - 3.07), and positive posterior impingement sign (OR: 2.34, 95% CI: 1.67 - 3.28) compared to the subjects without symptomatic TOS. It is necessary to recognize that TOS is not a rare pathology in overhead-throwing athletes, especially baseball players, and that players with symptomatic TOS are at significantly higher risk of shoulder/elbow pain.

Differences in body components and electrical characteristics between youth soccer players and non-athletes

Many previous studies have focused on youth soccer player injuries without body component analysis compared to non-athletes. Only a few studies which have investigated body components of youth soccer players, and studies that look at electrical characteristics used by rheobase and chronaxie as well as body components are even scarcer. Therefore, we feel that there is a need for a study investigating objective clinical analysis of the body components (body structure and body composition) and electrical characteristics of both youth soccer players and non-athletes. Sixty subjects participated in our study, comprising of thirty youth soccer players and thirty non-athletes. The Inbody 520 was used to measure and analyze body composition and the Duo 500 was employed to measure electrical characteristics. It was observed that the soccer players showed markedly lower total impedance compared to the non-athletes. In both legs, it was particularly noted that there were significant differences between the right and left sides. The soccer players showed a higher skeletal muscle mass and lean/ideal lean × 100% compared to the non-athletes. Furthermore, the soccer players had a lower rheobase and higher chronaxie. A comparison of the genders showed a similar pattern. In this study, we were able to separate the differences in body components and electrical characteristics between the subject groups using a systemic approach. Future studies on diverse types of athletes would contribute further to the development of clinical physiotherapy and sports rehabilitation.

What factors are associated with premature death among professional baseball players in Japan?

The aim of this study is to clarify factors related to premature death among Japanese professional baseball players by a case-control analysis. The subjects are two matching groups of 622 Japan Professional Baseball (JPB) league players, those deceased and those surviving. Cases and controls are matched by birth year. All players debuted on the first string between 1934 and 2003, and are listed in The Official Baseball Encyclopedia of Japan. To compare means and frequencies of characteristics between deceased and surviving groups, t-tests and chi-square tests were used. A logistic regression analysis was assessed contributions of each independent variable on death. Significant differences between deceased and surviving players were observed in this study;deceased players had higher body mass indexes and longer careers. Furthermore, logistic regression analysis confirmed that body mass index and career length were statistically significant determinants of death for baseball players. This is the first report to examine factors of death for professional baseball players except employing data attained from Major League Baseball.

Association between Daily Living Walking Speed and Lifestyle and Physiological Factors in Older, Female Pokémon GO Players

Background: Walking speed is a reliable barometer of adverse health outcomes, particularly among older people. Few studies evaluated factors associated with daily actual walking speed, rather than that measured in a laboratory setting or self-reported data. Methods: In a joint effort with The Pokémon Company, we recruited study participants through a women’s magazine and analyzed data from 63 Pokémon GO players. We measured the true walking speed in daily life among older women using a data-gathering mobile application. Then, using questionnaire survey data collected on these participants in 2019, we estimated the relationship between walking speed and their lifestyle and physiological factors. In the analysis, we employed a bi-directional stepwise linear regression approach, with the Akaike information criterion (AIC) for variable selection. Results: The mean age of the 63 participants was 63.03 years (standard deviation, SD 7.46);the average walking speed was 4.56 km per hour (SD 1.54);and 52 (82.5%) and 55 (87.3%) participants answered that they had excellent/good health physically and mentally, respectively. After adjusted for covariates in a stepwise regression approach, we identified a significant association between −1.33 (95% confidence intervals −2.52 to −0.15) km/hour lower walking speed and the experience of outdoor falls within a year. We also demonstrated that the walking speed was 1.07 (0.33 to 1.81) km/hour faster for those who had played Pokémon GO before the study started. Conclusions: The true walking speed in daily life among older women was measured by a data-gathering mobile application. Although all participants were women recruited on a voluntary basis with an understanding of the purpose of the study, and the surveys were conducted at a cross-sectional setting, a significant relationship with the experience of outdoor falls was demonstrated. We also present evidence suggesting a possible relationship between Pokémon GO play and faster walking speed.

Minor Players, Major Drivers

If light is the way to dispel darkness,then Beijing-based Landsky Technology Group Co.,Ltd.narrates a bright and fascinating way of displaying optical technology.“Light is no longer just for illuminating objects.A well-designed lighting scheme can make people truly sense their surroundings,”Liang Ye,a senior manager at Landsky,said.Coming in from this perspective,the hi-tech enterprise in the field of lighting technology has focused its research and development(R&D)efforts on enriching the relationship between light and life,light and space,as well as that between light and nature.

Analysis on the Physical Characteristics of High-level Football Players

This article uses the literature data method and literature review method to review and collect relevant literature,and summarizes and analyzes the representative views on domestic physical fitness research.After summarizing and summarizing,it is considered that:physical energy is the basic athletic ability of the human body expressed through physical qualities such as strength,speed,endurance,coordination,flexibility,and sensitivity,and is an important component of athletes'athletic ability.The level of physical fitness is closely related to the morphological characteristics of the human body and the functional characteristics of the human body.The morphological characteristics of the human body are the structural basis of its physical fitness,and the functional characteristics of the human body are its biological functional basis.As the basic ability of athletes,physical fitness is an important factor of athletes'competitive ability.Each competitive sport has its own specific physical characteristics and training rules and methods.Grasping these laws has very important guiding significance for the improvement of athletes'sports level.

ZTE Co-organized Global WiMAX Operation Congress in Singapore with Leading Industry Players

ZTE Corporation was among the key participants in the recently concluded WiMAX Operation Congress,

On appraisal models of basketball players'athletics a-bilities

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An Intial Study On the Training Of Point Man In Young Basketball Players

To train young point man is an important link in raising China′s basketball level.It consists of selecting good successors and train them. Criteria for the selection include ideology and behaviour, figure, physical fitness, type of nerves and genetic factors. The selection is conducted among 8 10-year-old children to find good successors.

Carving out a Niche African football players feature prominently in the Chinese leagues

The Chinese Football Association Super League （CSL） has broken yet another record. Indeed, the league＇s record recruitment budget of 388 million euros （$342.76 million） yeas broken this season. In 2018, more than 470 million euros （$415.19 million） have been spent on retaining the best football stars that have come to China in recent years, as well as on attracting even more talented footballers.

Research on the Space Construction of the Novel Ready Player One

The novel Ready Player One shows Ernest Cline’s ability of space construction,and demonstrates charm and artistic value of the virtual fantasy space it depicts.It is a science fiction with perfect combination of ideological content and artistic form.This thesis aims to discuss the Ernest Cline’s construction of the virtual pace and the real space in Ready Player One and the function of their construction.In real space,the environment is awful and dilapidated,and people’s lives are depressed.While in the virtual space,the world is colorful and people have varied ways of entertainment to fulfill their mind.This Thesis summarizes the effects brought by both the real space and virtual space for Ready Player One.With such a strong contrast,the conflict between the two spaces promotes the narrative process and also highlights the theme of the novel.

CBA内线外援运动员选择分析

篮球运动员的竞技水平直接影响球队的比赛成绩与运营,因此选择什么样的运动员对球队至关重要。在CBA中,外援运动员的选择,尤其是内线外援运动员的选择是一直困扰CBA球队的问题。本文采用文献资料法、主成分分析法与K-均值聚类法等研究方法,从CBA某队备选的25名内线外援运动员中选择2名运动员(2号、18号)进行更进一步的考查(试训),然后运用t检验、方差分析等方法对2号和18号运动员的试训数据进行分析和预测,最终选择2号运动员作为球队主力内线(中锋)外援运动员。

世界优秀足球运动员跨国流动及其影响因素探析

世界优秀足球运动员的跨国流动不仅是一种社会现象,也是体育学术界关注的热点。为对这一体育现象有更确切的了解和认识,同时为中国足球未来发展方略制定提供参考,研究通过文献资料法、数理统计法,首次以近4届世界杯参赛运动员的跨国流动为研究对象,即对第18—21届世界杯足球赛决赛阶段参赛运动员工作属地的数据进行分析。研究发现,在第18—21届世界杯足球赛决赛阶段,总计有1835名球员实现了跨国流动,其中在英格兰、德国、意大利、西班牙、法国这5个国家(地区)的球员数量最多,共计1159人,占实现跨国流动球员总数的63.16%,世界足球人才“欧洲聚集”尤其是“欧洲五大联赛聚集”的马太效应十分明显。研究结论认为,影响世界优秀足球运动员跨国流动的因素主要有经济因素、历史文化因素、政策因素、个人因素等,但本质上是经济因素在发挥主导作用。

国家队运动员身份混同引发的商业代言法律争议

近年来,随着社会经济的不断发展,国家队运动员身份发生了重大变化,产生了身份混同这一复杂的问题,进而可能导致对身份法律性质的认识谬误、多重身份规范适用冲突等诸多法律问题。运用文献分析法,结合国家队队员参与商业代言活动所引发的相关法律争议,提出相关治理建议,以期为完善我国体育纠纷解决机制和落实保障运动员合法身份权益建言献策。具体来说,应坚持确立身份规则这一出发点和落脚点,在此基础上明确国家队运动员身份权利的内容与边界,以及试行运动员商业开发活动招标制度。