Extended Abstract
1.    Introduction
Most coaches and athletes have turned to pre-season screening in competitive and professional sports. This screening is done in order to prevent injuries and also to improve implementation strategies. The results of functional screening tests can be used to personalize training programs and potentially improve sports performance and reduce the risk of sports injuries. The functional screening test will be able to identify, evaluate and classify asymmetries and movement limitations. It seems that the asymmetry and limitation of the basic movement patterns can reduce the benefits of functional training and physical preparation. On the other hand, the factor of fatigue can be considered as one of the important factors in the occurrence and increase of the risk of injury, and that is why screening tools have been used to identify the risks of possible injuries in sports. Volleyball is a complex sport with high technical and tactical movements, where speed and power movements are often seen, and a lot of pressure is placed on the players during training and matches, which is likely to cause injuries during pre-season matches and exercises. The prevalence of injuries in volleyball players has been reported between 1.7 and 2.4 injuries per 1000 hours of play. Therefore, the aim of the present study was to investigate the effects of the functional fatigue protocol on the overall score of the volleyball-specific functional movements screening tool in professional female volleyball players.
2.    Methods
The current research reflects a semi-experimenta designl. The samples of the current research were 40 active volleyball players of the Premier League with at least 3 years of volleyball playing experience, with an age range of 16-20 years, who were selected through convenience sampling based on availability and who were placed in a group. The subjects had no history of hearing, vestibular, vision, fracture and surgery in the lower limbs (in the past year), neurological problems and concussions, and any musculoskeletal injuries, and they had no history of serious injuries. Individual information, sports medical records and consent form were collected through a questionnaire that was distributed among the subjects. Then, in a meeting, the subjects were familiarized with the tool and how to implement the fatigue protocol and the points that they had to consider during this research, in written and oral form. In order to prevent injuries, the subjects performed stretching and warming up for 10 minutes. Then a screening test was taken from the subject. All the subjects' movements were observed and scored by the researcher. Immediately after the test, the subjects performed the functional fatigue protocol defined by Sasco and Wilkins (2004). Immediately after performing the fatigue protocol, the functional screening test for volleyball was taken again. The RPE scale was used to determine the level of fatigue.
3.    Results
According to the previous literature in the field of injury prevention tools in different fields, the test used in this research, which was developed by Tabatabaei (2018), had acceptable validity and reliability reports based on statistical analyses, and therefore fitted well with the purpose of the study, which aimed at reducing the risk of possible injuries in the field of volleyball. Based on this, using the Wilcoxon test (non-normal distribution of data), the significance of the effect of volleyball-specific functional fatigue on the research variables was investigated. The results showed that carrying out the specific fatigue protocol in volleyball on Deep squat, Hexagon, Inline lunge, push up with trunk stability, Rotary stability, Squat jump, closed kinetic chain upper extremity, Triple jump for distance, Triple hop for distance, Lateral lunge, Sidearm medicine ball throw would have a significant effect on the functional screening test scores, and the performance of all these variables would be weakened (p ≤ 0.05).
4.    Conclusion
The findings of this study show that in order to identify changes in the movement patterns, it is necessary to screen of volleyball athletes in the state of fatigue. Identifying changes in the quality of movements in volleyball athletes in a fatigue state shows that screening should also be done in a fatigued state, so that it will be possible to identify movement patterns that may lead to injury.

Ethical Considerations
Compliance with ethical guidelines
There were no ethical considerations to be considered in this research.
Funding
This research did not receive any grant from funding agencies in the public, commercial, or non-profit sectors.
Authors' contributions
All authors equally contributed to preparing article.
Conflicts of interest
The authors declared no conflict of interest.