Objective The reliability of the RUS-CHN of The Standards of Skeletal Maturity of Hand and Wrist for Chinese-China 05 and the TW_3-C Carpal methods was studied and the effects of readers' experience on the measured skeletal age were determined.Methods Under the conditions that readers were blinded to the age and sex of the children,the hand and wrist radiographs of 75 children(skeletal age from 3 to 18 years) were independently read by 11 readers using RUS-CHN method and the radiographs of 46 children(skeletal age from 3 to 13.5 years) were analyzed by 6 readers using TW_3-C Carpal method.The radiographs were re-read by the same readers 20 days later.The percentage agreement in the ratings and the differences of skeletal age in the rereading were used to evaluate the reliability.Results It was found that(a) intraobserver percentage agreement of ratings were 63.4% to 82.2% for RUS-CHN and 65.6% to 83.2% for TW_3-C Carpal respectively,the intraobserver 95% confidence limits for a single reading were ?0.40 year to ?0.76 year for RUS-CHN and ?0.38 year to(?0.71) year for TW_3-C Carpal respectively;(b) interobserver percentage agreement of ratings were 61.3% to 77.3% for RUS-CHN and 77.4% to 88.0% for TW_3-C Carpal respectively;interobserver 95% confidence limits for a single reading were ?0.42 year to ?0.96 year for RUS-CHN and ?0.42 year to ?0.78 year for TW_3-C Carpal respectively.Conclusion The present findings suggest that the reliability of skeletal age assessment between readers is significantly different and that the reliability levels of the experienced and relative experienced readers is higher,which can be obtained for few nonexperienced readers through training of assessment of skeletal age.The assessments of skeletal age are unreliability for the majority of non-experienced readers,so that the further training for them is needed.

Objective The determination of skeletal maturity is an important measure for selecting sports talent. The characteristics of skeletal development of hand and wrist in Chinese children were investigated in order to compare with overseas experiences. Methods The subjects were 16035 children, aged 2～18 years. The skeletal maturity of hand and wrist of the subjects was estimated by TW3 method and was compared with that of European, European North American and Japanese children. Results In comparison with European and American children, Chinese and Japanese children showed a similar patterns of skeletal maturation. The TW3-RUS skeletal maturity of Chinese children was retarded by 0.3～0.6 year in boys at the age of 8～12 and was very close to European and American in girls at the age of 5～10. Older than 12 years of age in boys and 10 years of age in girls, the TW3-RUS skeletal maturity of Chinese children accelerated and became advanced by 1.1～1.6 years in boys, by 1.2 years in girls. As compared with European and American children, the TW3-carpal maturity delayed by 0.3～0.6 year in Chinese boys at the age of 3～10 and by 0.2～0.4 year in Chinese girls at the age of 2～5. The TW3-carpal maturation accelerated after age of 10 in boys and age of 5 in girls. The age of complete maturity in all carpals was advanced by 1.4 year in boys and girls. Conclusion As compared with European and American children in 1970s-1990s, the delay of skeletal development of hand and wrist in Chinese children was not obvious in childhood, and the extent of advanced skeletal maturity and the age of advanced complete maturity of Chinese children are more evidently.

0.05). The average and maximal heart rates of subjects in bench stepping during exercise were higher than those in home stepping (P 0.05), however, the correlation between the direct calculation and home stepping was high (r=0.46, P 0.05).③The correlation between two step experiments for male students was high (r=0.73, P 0.05), however, the difference for female students was significant (P 0.05). CONCLUSION: Two indirect test protocols need further improvements, but home step is more appropriate for a large sample of constitution assessment by comparison of measurement efficiency and precision.

BACKGROUND:Human has a high level heritability in physical performance. With the development of technology and test method in molecular biology, the researchers of sport science are concerned with the influence of gene variation on the elite athlete performance. They begin to know the important value of gene on predicting the physical performance.
OBJECTIVE:To review the research results in the field of gene polymorphisms and elite athlete performance and to expatiate the problems in these researches, thereby offering some proposals.
METHODS:A computer-based online research of PubMed and CNKI databases was performed to col ect articles published from 1998 to 2013 with the key words“elite athlete performance, gene polymorphisms, endurance, power, training response”in Chinese and English. There were 150 articles after the initial survey. A total of 80 articles were included according inclusion and exclusion criteria.
RESULTS AND CONCLUSION:The researches of this field are mainly focused on the three aspects:elite endurance performance, elite power performance, and training response, which are associated with gene polymorphisms. The main genes related to elite endurance performance are ACE, mtDNA, PPAR, ADR, GNB3, NRF2, etc. The main genes related to elite power performance are ACTN3, ACE, GDF-8, IL-6, HIF-1, etc. The main genes related to training response are HBB, TFAM, NRF2, AR, FECH, etc. Several gaps in the current researches have been identified including smal sample size of most athletic cohorts, lack of corroboration with replication cohorts of different ethnic backgrounds. The numerous research findings can be applied to the gene selection of athletes by creating some kinds of algorithms and models.