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Early Versus Late Rapid Force Production During Single-Joint Isometric Hamstring Assessment Using Force Plates.

Nicholas J Ripley1, Ritchie Barber1, Jack T Fahey1

  • 1School of Health and Society, University of Salford, Salford, United Kingdom ; and.

Journal of Strength and Conditioning Research
|August 23, 2024
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Summary

Elite female soccer players exhibit significantly greater early rapid force (ERF) production than late rapid force (LRF) during isometric hamstring assessments. This finding aids in streamlining performance evaluations and informing targeted interventions for athletes.

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Exercise Physiology

Background:

  • Assessing hamstring strength is crucial for injury prevention and performance in athletes.
  • Understanding the nuances of rapid force (RF) development can refine assessment protocols.
  • Previous research has not fully differentiated early versus late RF production in isometric hamstring assessments.

Purpose of the Study:

  • To compare time-matched early rapid force (ERF) and late rapid force (LRF) development during a 90-90 isometric hamstring assessment.
  • To investigate these differences in elite female soccer players.
  • To determine the practical implications for performance assessment and athlete management.

Main Methods:

  • Twenty-one elite female soccer players performed maximal isometric unilateral hamstring contractions.
  • Assessments were conducted in a 90-90 hip and knee flexion position using force plates.
  • Data analyzed for peak force, ERF (0-100 ms), and LRF (100-200 ms).

Main Results:

  • Significant and large differences were found between ERF and LRF for both left and right limbs (p < 0.001, g = 2.13-3.06).
  • ERF represented a substantially higher percentage of peak force (52.85-54.99%) compared to LRF (15.25-15.82%).

Conclusions:

  • Practitioners can utilize the distinct ERF and LRF contributions to optimize hamstring assessment efficiency.
  • Regular monitoring of ERF may guide interventions, load management, and return-to-play decisions.
  • These findings highlight the importance of analyzing different phases of force production in athletic assessments.