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Reactive strength index-modified: reliability, between group comparison, and relationship between its associated

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Summary

Reactive strength index-modified (RSImod) is a reliable measure for combat athletes and physically active men. Combat athletes showed better jump height reliability and performance, suggesting superior stretch-shortening cycle utilization.

Keywords:
Combat fightersCountermovement jumpJump performanceStretch-shortening cycleTest-retest reliability

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Area of Science:

  • Sports Science
  • Biomechanics
  • Human Performance

Background:

  • The reactive strength index-modified (RSImod) is a key metric for assessing explosive power.
  • Understanding the reliability and performance differences of RSImod between combat athletes and physically active men is crucial for training optimization.

Purpose of the Study:

  • To compare the test-retest reliability of RSImod, jump height (JH), and time to take-off (TTT) in combat athletes and physically active men.
  • To investigate performance differences in these metrics between the two groups.
  • To examine the correlations between RSImod, JH, and TTT.

Main Methods:

  • Twenty combat fighters and 18 physically active men participated in three laboratory visits.
  • Familiarization session followed by two test-retest sessions spaced 2–7 days apart.
  • Measurements included RSImod, JH, and TTT during countermovement jumps.

Main Results:

  • Both groups exhibited trivial to small between-day performance changes (≤ 1.1%).
  • Combat athletes demonstrated lower test-retest variation for RSImod and JH compared to non-athletes.
  • Combat athletes achieved significantly greater JH, but RSImod and TTT differences were non-significant.
  • RSImod showed strong positive correlations with JH and moderate negative correlations with TTT, particularly in athletes.

Conclusions:

  • RSImod is a reliable measure for countermovement jump testing in both combat athletes and physically active individuals.
  • Combat athletes exhibit superior jump height and reliability in RSImod and JH compared to physically active men.
  • The stronger relationship between RSImod and JH in athletes suggests enhanced utilization of the stretch-shortening cycle and motor unit recruitment for improved explosive performance.