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Construct Validity, Test-Retest Reliability, and Repeatability of Performance Variables Using a Flywheel Resistance

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Flywheel resistance training devices offer valid measures of power, force, and work. However, test-retest reliability and repeatability vary across exercises, suggesting familiarization is key for accurate performance assessment.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Power production is crucial for athletic performance, yet quantifying it during resistance exercise remains challenging.
  • Flywheel resistance training devices offer a potential solution for measuring power output.
  • This study investigates the validity and reliability of a specific flywheel device.

Purpose of the Study:

  • To determine the construct validity of flywheel-based performance testing.
  • To assess the test-retest reliability and repeatability of performance variables measured by a flywheel device.
  • To evaluate the accuracy of power, force, and work measurements across different exercises and inertia levels.

Main Methods:

  • Twelve resistance-trained males performed exercises (bent-over row, Romanian deadlift, biceps curl) using a flywheel device (Exxentric kbox 4 Pro) with varying inertia.
  • Measurements included average power, peak power (concentric and eccentric), average force, average speed, and total work over 3 sets of 5 maximal repetitions.
  • Data were analyzed using regression, Pearson's correlation, Bland-Altman plots, and coefficient of repeatability.

Main Results:

  • Regression analysis showed a near-perfect relationship between measured and predicted power, force, and work.
  • Test-retest reliability was good to excellent (r ≥ 0.70) for most outcomes, except peak eccentric power in biceps curls (r = 0.69).
  • Bland-Altman analysis indicated statistically significant bias (5-15%) for some measures, and high coefficients of repeatability suggested poor trial-to-trial consistency.

Conclusions:

  • Flywheel-based performance testing demonstrates construct validity for measuring power, force, and work.
  • Reliability and repeatability vary significantly between different exercises and specific outcome measures.
  • Athletes unfamiliar with flywheel devices may need multiple testing sessions or a familiarization period for accurate results.