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Acute effects of augmented eccentric loading on jump squat performance.

Christopher A Moore1, Lawrence W Weiss, Brian K Schilling

  • 1Exercise Neuromechanics Laboratory, University of Memphis, Memphis, Tennessee 38152, USA. chrismoore57@mac.com

Journal of Strength and Conditioning Research
|May 29, 2007
PubMed
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Augmented eccentric loading (AEL) before jump squats did not enhance force, velocity, or power. This study found no acute performance benefits from varying AEL intensities in resistance-trained men.

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Augmented eccentric loading (AEL) is a training technique aimed at enhancing subsequent concentric performance.
  • The acute effects of varying AEL intensities on jump squat performance require further investigation.

Purpose of the Study:

  • To determine the acute effects of a spectrum of eccentric loads on force, velocity, and power during maximal-effort jump squats.
  • To investigate if different augmented eccentric loading (AEL) intensities influence concentric jump squat performance.

Main Methods:

  • Thirteen resistance-trained men performed jump squats under four conditions: 30% 1RM isoinertial load, and 30% 1RM concentric load preceded by 20%, 50%, or 80% 1RM AEL.
  • Measurements included peak force, velocity, and power, along with interval data during the concentric phase.

Related Experiment Videos

  • The study employed a repeated measures design with counter-balanced conditions and reliability testing.

    • Main Results:

    • No statistically significant differences were observed in peak force, velocity, or power across the experimental augmented eccentric loading (AEL) conditions.
    • Force and power outputs at 20-ms intervals during the initial 400 ms of the concentric phase also showed no significant differences.

    Conclusions:

    • Acute application of a load-spectrum of augmented eccentric loading (AEL) prior to a 30% 1RM jump squat does not acutely enhance force, velocity, or power.
    • Current findings suggest that AEL, under the tested conditions, may not be an effective acute strategy for improving jump squat performance in resistance-trained individuals.