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Hamstring Strain Injury Risk Factors in Australian Football Change over the Course of the Season.

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Hamstring strain injury risk factors differ throughout the Australian Football season. Nonmodifiable factors predict preseason injuries, while biceps femoris muscle architecture predicts early in-season injuries.

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Injury Prevention

Background:

  • Hamstring strain injuries (HSI) are common in professional Australian Football.
  • Understanding injury risk factors across the competitive season is crucial for prevention.

Purpose of the Study:

  • To identify predictive factors for hamstring strain injuries (HSI) at different stages of the Australian Football season.
  • To differentiate risk factors for preseason, early in-season, and late in-season HSIs.

Main Methods:

  • Assessed eccentric knee flexor strength and biceps femoris long head architecture in 311 Australian Football players over two seasons.
  • Collected prospective HSI data and analyzed risk factors using multivariate logistic regression and recursive feature selection.

Main Results:

  • Risk factors varied significantly by injury timing: preseason (previous HSI, age, height, muscle thickness), early in-season (pennation angle, fascicle length).
  • No input variables predicted late in-season HSIs.
  • Assessing changes in data across preseason did not improve in-season HSI prediction.

Conclusions:

  • Predictive factors for HSI differ across the Australian Football season.
  • Nonmodifiable factors (previous HSI, age, height) are key for preseason injuries.
  • Modifiable biceps femoris muscle architectural measures are associated with early in-season injuries.