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.

National football promotion in China: Opportunities and challenges in public health

Dear editor, In 2015, a national reform plan was implemented by the central government that covers not only professional clubs and leagues but also campus and grassroots football, to develop football （soccer） in China.r According to the plan of China＇s Ministry of Education （MOE）,2 football will be nationally pro- moted among school students and youth. Furthermore, MOE plans to select 20,000 primary or middle schools in which the sport would have been promoted by 2020. Then, this number would be increased to 50,000 by 2025.

A Survey of Medication Taken by Chinese Athletes

Objective To make a survey of medication taken by Chinese athletes and a comparison between Chinese athletes and athletes from other countries in order to get information about how to improve Chinese athletes’ performance. Method The information came from the forms"Doping Control Sample Collection" in which athletes answered the question: "What medications have you taken in the past 3 days?" The medicines taken by athletes were classified and statistically analyzed.Results 2,330 athletes and 25 kinds of sports were involved in. Medicines were statistically analyzed with 4 classes: profiling of declaration, vitamins and minerals, medicines for treatments, alternative medicine. Conclusion The survey recorded the types of supplements and medications taken by athletes in China in 1999. Chinese athletes took less vitamins and more alternative medicines than athletes from other countries.

Scapular bone grafting with allograft pin fixation for repair of bony Bankart lesions: A biomechanical study

BACKGROUND Severe bony Bankart lesions are a difficult challenge in clinical treatment and research.The current treatment methods consist mostly of Latarjet-Bristow surgery and its modified procedures.While good results have been achieved,there are also complications such as coracoid fracture,bone graft displacement,and vascular and nerve injury.AIM To analyze the techniques and biomechanical properties of transversely fixing a bone block from the scapular spine using bone allograft pins with suture threads to repair bony Bankart lesions.METHODS Fresh human shoulder joint specimens and a cadaver specimen model for scapular bone grafting with allograft pin fixation for repair of bony Bankart lesions were used.When the humeral rotation angles were 0°,30°,60°and 90°,and the axial loads were 30 N,40 N,and 50 N,the humerus displacement was studied by biomechanical experiments.RESULTS When the angle of external rotation of the humerus was 0°,30°,60°,and 90°,with axial loads of 30 N,40 N,and 50 N,the data of the normal control group,allograft pin repair group,and titanium alloy hollow screw repair group were compared with each other by the q-test,which showed that there were no statistically differences among the three groups(P>0.05).CONCLUSION The joints repaired with bone block from the scapular spine transversely fixed with allograft bony pins to repair bony Bankart lesions show good mechanical stability.The bone block has similar properties to normal glenohumeral joints in terms of biomechanical stability.

Physical activity guidelines for Chinese children and adolescents:The next essential step

1.Introduction Because of the joint efforts of Active Healthy Kids Global Alliance,the results from the Global Matrix 2.0,involving 38countries,provide a timely insight into physical activity(PA)in children and adolescents worldwide.1All the 38 countries,including China,published a report card on 9 PA indicators.1,2Surprisingly,92%of the countries had average grades of C or

COVID-19 countermeasures of Chinese national athletes:Prevention,treatment,and return to play

Under the condition of normalized epidemic,how athletes train and compete well has been in the spotlight.This article reported the symptom,hospitalization and training situation of seven confirmed cases of coronavirusdisease-2019(COVID-19)among Chinese national teams.Moreover,the paper summarized the experience of Chinese national teams in terms of epidemic prevention and control,treatment of infection,and safe return to play.Through a scientific combination of medication and non-medical treatment,seven athletes were all discharged from the hospital.These discharged athletes underwent strict isolation and scientific training before returning to sports teams.Before returning to play,continuous monitoring of physical and mental condition was required.All seven athletes returned to play safely and performed excellently.As for hosting large-scale sporting events,the entire enclosed-loop management from immigration to competition was proposed in this paper.This study could serve as a standard of epidemic prevention and control,treatment for infection and safe return to play during competition and training around the world.

PM_(2.5):A barrier to fitness and health promotion in China

1.Introduction Physical inactivity has been identified as the fourth leading risk factor for global mortality.~1Globally,it accounts for about6%of deaths,21%–25%of breast and colon cancers,27%of diabetes,and 30%of ischemic heart disease.~1In China,the economic costs of health diseases due to physical inactivity had reached 6.7 billion US dollars in 2007,which accounted

Consensus statement of Chinese experts on exercise prescription(2023)

Exercise prescriptions play a vital role in the prevention and treatment of chronic diseases.A consensus regarding exercise prescription is important for physical health.The“Consensus statement of Chinese experts on exercise prescription”(hereinafter referred to as“Expert Consensus”)divides exercise prescription into two categories:fitness exercise prescription and medical exercise prescription.Traditional Chinese fitness exercises,exercise risk,exercise prescription,and basic precautions for exercise prescription are explained.