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The countermovement jump (CMJ) is a valid and reliable tool for assessing dynamic eccentric strength. This test correlates with the one-repetition maximum back squat (1RM-BS) eccentric measures, offering an alternative assessment method.

Keywords:
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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Assessing dynamic eccentric strength is crucial for athletic performance and injury prevention.
  • The countermovement jump (CMJ) is a common performance test, but its utility for eccentric strength assessment requires validation.
  • Existing methods for eccentric strength testing can be time-consuming or require specialized equipment.

Purpose of the Study:

  • To determine the validity and reliability of the countermovement jump (CMJ) as a dynamic eccentric (Ecc) strength test.
  • To compare CMJ eccentric phase kinetics with established one-repetition maximum back squat (1RM-BS) eccentric measures.
  • To evaluate the CMJ's potential as an alternative tool for eccentric dynamic strength assessment.

Main Methods:

  • Thirty-three college male student-athletes participated.
  • Participants performed countermovement jumps (CMJs) and one-repetition maximum back squats (1RM-BS).
  • Both CMJ and 1RM-BS tests were conducted on twin force plates to capture kinetic data.

Main Results:

  • The CMJ demonstrated significant correlations with one-repetition maximum back squat eccentric peak force (EccPF) and eccentric mean force (EccMF) (r = 0.61–0.69).
  • All measured parameters exhibited a coefficient of variation (CV) below 10%, indicating good reliability.
  • Intraclass correlation coefficient (ICC) values for CMJ metrics ranged from 0.94 to 0.97, signifying moderate to excellent reliability.

Conclusions:

  • Countermovement jump eccentric phase kinetics are associated with one-repetition maximum back squat eccentric peak force and mean force.
  • The CMJ proves to be a valid and reliable alternative for assessing dynamic eccentric strength.
  • This study supports the use of CMJ as a practical tool in sports science and training settings.