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EP-01 Fitness Assessment, Exercise Training, and Performance of Athletes and Healthy People

Relationship Between Acute:Chronic Ratio And Injury In Women’s Collegiate Soccer Players


Schwab, Jake A.; Brown, Dale FACSM; Laurson, Kelly; Dodd, Daniel

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Medicine & Science in Sports & Exercise: August 2021 - Volume 53 - Issue 8S - p 47-48
doi: 10.1249/01.mss.0000759636.31938.97
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PURPOSE: The goal of this study was to further analyze the relationship between the acute:chronic ratio and injury within a women’s collegiate soccer team over the course of their pre-season and regular season and compare the results to other literature.

METHODS: Thirty female collegiate soccer players wore Polar Team Pro heart rate monitors over the course of their season with eight sustaining injury. Two injuries were season ending, four injuries kept athletes out multiple weeks, and two injuries kept athletes out less than one week. Training load and distance were tracked for all individual practices, team practices, and games. Data was extracted from the Polar Team Pro website and exported into Microsoft Excel. Total training load and distance was calculated for the current week and divided by the previous four weeks to calculate the acute:chronic ratio. For the current week, total training load and distance would be totaled for all athletes up to the day of injury.

RESULTS: Injuries that occurred on Sunday were classified as last day of the week, while injuries that occurred any other day were classified as middle of the week. Averages of all healthy athletes’ data were compared to the injured athlete’s data every week injury was recorded, with higher differences found in the middle of the week versus the end of the week.

CONCLUSION: Measuring the acute:chronic ratio as the past seven days divided by the 28 days prior may be better at minimizing injury during the week, as well as the end of the week. All acute:chronic ratios for injury at the end of the week except for one fell within zones considered healthy from past research, showing these injuries may have been caused from other factors.

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