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The Association Between Injury Occurrence, the Acute:Chronic Workload Ratio and Other Correlates in Division I Collegiate Soccer Athletes: A Retrospective Study

O'Neill, Carson (2020) The Association Between Injury Occurrence, the Acute:Chronic Workload Ratio and Other Correlates in Division I Collegiate Soccer Athletes: A Retrospective Study. Master's Thesis, University of Pittsburgh. (Unpublished)

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External workloads derived from global position systems (GPS) have recently become a common objective measurement tool for injury and monitoring. While there are many variables related to injury, their relationship with the acute:chronic workload ratio (ACWR) and injury has not been examined in the collegiate soccer population. The purpose of this study was to examine the association between injury occurrence, the ACWR and other correlates such as phase of season and player position throughout two competitive seasons in Division I collegiate soccer athletes. Thirty-three collegiate men’s soccer players participated in the study (age: 19.67  1.53 years, height: 69.94  2.50 in, weight: 73.21  5.30 kg). Separate statistical analyses were conducted to identify the relationships between injury occurrence, the ACWR, and the other respective correlates (α=0.05). No significant associations were observed when investigating ACWRs with both phase of season and player position. No significant findings were noted between injury occurrence and phases of the season. Although no significance was seen between injury occurrence of any/all injuries among all 5 player positions, a statistically significant association was displayed between player position and non-contact injuries, p = 0.002, as well as practice injuries, p < 0.001 during the 2018 season. When assessing the effect of ACWR values on injury, a significant association was noted for any/all injuries, χ2(1) = -1.494, p = 0.034, as well as non-contact injuries (χ2(1) = -1.983, p = 0.041) and practice injuries (χ2(1) = -2.877, p = 0.006). The results suggest that the ACWR does not seem to be significantly influenced by phase of season and player position, however, a negative ‘U’-shaped association may be seen with injury occurrence where both low and high ACWRs increase the occurrence of injury. Furthermore, the lack of subjects in each player position may have contributed to the presence of a relationship with injury occurrence during only one season. Future studies should consider various subject populations and demographics, standardize the method of ACWR generation, and investigate injury as patterns of relationships among variables to better understand of the multifactorial nature injury.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
O'Neill, Carsoncdo11@pitt.educdo11
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAllison,
Committee MemberLovalekar,
Committee MemberMurray,
Date: 8 September 2020
Date Type: Publication
Defense Date: 15 July 2020
Approval Date: 8 September 2020
Submission Date: 31 July 2020
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 70
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Sports Medicine and Nutrition
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Injury, injury occurrence, external workloads, acute:chronic workload ratio, phase of season, player position, soccer
Date Deposited: 08 Sep 2020 14:28
Last Modified: 08 Sep 2020 14:28


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