1. Introduction
The duration of training in a sport is also an influential factor in increasing the anomaly among athletes. In this regard, Grabra, in his research, has pointed out the relationship and the effect of training and competition on the curvature of the spine [1]. In this regard, Rajabi et al. Have reported that the degree of curvature of kyphosis of freestyle wrestlers was higher than that of Greco-Roman wrestlers and non-athletes [2].
There is scattered information about the prevalence of postural changes among wrestlers. The differences between the type of wrestlers’ styles of making postural changes are also not clear. Therefore, in this review study, an attempt has been made to collect all the studies examining the postural changes of wrestlers and draw a general conclusion about the prevalence of postural changes among wrestlers. Also, specify the type of changes and determine what kind of situational change each wrestling style makes the most.
2. Materials and Methods
This study performed a comprehensive survey of the prevalence of postural changes in freestyle and Greco-Roman wrestlers. Search databases were as follows: PubMed/MEDLINE, EBSCO, Web of Science, Science Direct, Cochrane Central Register of Controlled Clinical Trials, Google Scholar, and Scopus. 
The keywords were as follows: Wrestling or wrestler or freestyle wrestling or Greco-Roman wrestling or Athlete * and Musculoskeletal Abnormalities* or Deformity or posture distortion or Muscle imbalances or Postural.
Also, this work in Persian databases MAGIRAN, IRANDOC, IranMedex, MedLib, SID with the following keywords: freestyle wrestling, Greco-Roman wrestling, postural changes, postural disorders, spine alignment, lower limb alignment, wrestler, muscle imbalances, deformity from 2012 to April 2021 took place. In addition, a manual search and a complete review of article sources were performed.
After collecting the search results, the title and summary of the articles were read. If the reports comply with the inclusion and exclusion criteria, the results will be used in the review study and otherwise discarded. Based on the requirements and objectives of the research, 11 articles were selected after the evaluation process. The articles were provided in full text.
The inclusion criteria were as follows: In the first stage, screening the title and abstract of descriptive studies was performed, focusing on the prevalence of freestyle and Greco-Roman wrestlers and publication in Persian and English. One researcher was reviewing abstracts of articles. The second stage of screening the whole text was based on the publication of the index (prevalence of changes in the status of freestyle and Greco-Roman wrestler) and the specificity of the target population (wrestlers with status changes). A researcher performed the full-text screening. A senior researcher also checked the final list of selected papers to ensure that all documents aligned with the research objective. A researcher and a senior researcher reviewed the descriptive information summary. Exclusion criteria included articles that dealt with wrestlers’ sports injuries and articles not written in Persian and English.
3. Results
A search of electronic sources yielded 251 titles. By manually searching and reviewing the sources of the articles, 5 more titles were obtained. After removing duplicate titles, 187 abstracts were identified for review. After reviewing the titles and abstracts of the articles, 161 articles were deleted, and 26 papers were selected to read the full text. After reviewing the full text of the articles, 11 articles that examined the prevalence of changes in the status of freestyle and Greco-Roman wrestlers were selected, and their results were reported (Table 1). 





4. Conclusion
It can be concluded that wrestlers have more kyphosis, lordosis, forward shoulder, forward head, flat foot, and more Q angle. Compared to the two styles, freestyle wrestlers have a more kyphosis angle than Greco-Roman wrestlers, and Greco-Roman wrestlers have a higher lordosis angle than freestyle wrestlers. Also, the flatness of the foot and the high Q-angle can be seen in the foot of most freestyle wrestlers with a long history of sports. However, there have been conflicting reports about the head-forward and shoulder-forward angles between the two styles, and further studies are needed. Also, one of the essential factors that should be considered in more changes in wrestlers’ posture is having a long history of sports.
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 profit-non sectors.
Authors' contributions
All authors equally contributed to preparing this article.
Conflicts of interest
The authors declared no conflict of interest.

 

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