The purpose of the present article is to design indicators and variables that represent the value of VOLLEYBALL PLAYERS. This research method is applied, which was done in a quantitative and qualitative way. The research tool was a semi-structured interview with experts in the field of player valuation. In this research, the statistical population included all the experts and specialists in human resources and financial management issues in sports, and also VOLLEYBALL experts. The sample size included a number of VOLLEYBALL sports experts who expressed their ideas to determine the variables. A total of 60 variables were extracted, of which 40 are quantitative indicators and 20 are qualitative indicators. These indicators are not only effective in the selection of PLAYERS, but can also determine the price and final value of the PLAYERS.

VOLLEYBALL is one of the most popular sports among the female athletes. Although VOLLEYBALL is considered as a non-contact game, high incidence of injuries are reported for VOLLEYBALL PLAYERS. Knee injuries are one of the most common types of injuries in VOLLEYBALL. This study aimed to review the literature regarding the anterior cruciate ligament (ACL) injuries focused on the VOLLEYBALL PLAYERS. A review literature was conducted via searches in Google Scholar, Scopus, PubMed, EBSCO host (Medline Database, Sport Discus), and Science Direct (2011 to march 2021) using various key terms such as "anterior cruciate ligament" and "knee injury". Based on the evidences, although the internal and external risk factors for ACL injury have been extensively studied, the biomechanical factors that expose athletes to this injury are still unclear. To answer the specific question of the present study, different factors associated with ACL injury especially in female’, s athletes, a comprehensive review of basic and applied studies is necessary. In this paper, after explaining about ACL injuries extracted from articles, the role and application of ACL, its mechanics and patho-mechanics have been discussed. Also, occurrences of ACL injury in VOLLEYBALL ranks among the other sports, athlete/non-athletes, gender and age of PLAYERS, is divided as well. It is believed that biomechanical and neuromuscular differences in the trunk and lower limbs are the most likely reason for the significant difference in the high prevalence of non-collision ACL injury in female compared to men.

Background: Excessive repetitions of the landing and jumping task are a key risk factor for lower extremity injury (specially ACL) in female VOLLEYBALL PLAYERS. Aim: this study investigates the effect of Sports-Metrics VOLLEYBALL Training (SMVT) on landing technique in female VOLLEYBALL PLAYERS. Materials and Methods: The participants of this study were 25 female young VOLLEYBALL PLAYERS and randomly divided into training (TG, n=13) and control groups (CG, n=12). The TG performed SMVT for 18 sessions, and the CG performed their regular training. Landing error scoring system (LESS) test were used for assessing landing errors. SPSS (version 25) was used to analyze the statistical data (P<0. 05). Results: The results of the data analysis showed a significant improvement (P=0. 01) in LESS in TG (from 8. 62 to 5. 54), but no significant changes in CG the LESS (P=0. 62, from 8. 00 to 8. 23). Eighteen sessions SMVT reduced the landing error by 35. 73% in the TG. Conclusion: Base on previous research the SMVT reduces lower extremity injuries and the results of this study showed that SMVT significant improvement the landing technique. Therefore, performing SMVT is recommended for female VOLLEYBALL PLAYERS because it is effective in both preventing injuries and improving landing technique.

Introduction: Kinetics parameters are known as some of the main reasons of VOLLEYBALL injuries resulting from landing during performing various skills. Information about lower extremity kinetics in landing will help to understand characteristics of various injuries and develop injury prevention programs. So the aim of the present study was kinetical analysis of predictive injuries parameters during landing in VOLLEYBALL PLAYERS. Materials and Methods: Eighteen junior male VOLLEYBALL PLAYERS (Age: 17. 78±, 0. 94yrs) were asked to perform three maximal blockjump on a force platform. The data of force (Fmax, Fmin), impulse (I), loading rates (LRmax, LRmax-min), time to stabilization (TS), time to peak forces (TPF) and time to maximum to minimum force (TFmax-min) variables were extracted andanalyzed. Pearson correlation coefficient (r) was employed to investigate possible relationship between kinetics and temporal landing parameters of block jump in participants. Results: The results showed significant correlations between some variables including Fmax with LRmax, LRmax-min and TPF, Fmin with TS, LRmax with Fmax, LRmax-min and TPF, LRmax-min with Fmax, LRmax, TPF and TFmax-min, TS with Fmin, TPF with Fmax, LRmax, and LRmax-min, TFmax-min with LRmax-minduring landing in VOLLEYBALL PLAYERS. Conclusion: Biomechanists and sports injury expertise should monitor both of temporal and kinetic variables with respect to performance optimization as well as decreasing injury prevalence.