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Related Experiment Video

Updated: Jan 21, 2026

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies
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Muscular Pre-activation Can Boost the Maximal Explosive Eccentric Adaptive Force.

Laura V Schaefer1, Frank N Bittmann1

  • 1Regulatory Physiology and Prevention, Department of Sports and Health Sciences, University of Potsdam, Potsdam, Germany.

Frontiers in Physiology
|August 10, 2019
PubMed
Summary

Pre-activating the quadriceps femoris muscle significantly enhances maximal explosive eccentric adaptive force (xpAFeccmax). This finding suggests that controlled muscle activation before impact can improve athletic power output and may inform training strategies.

Keywords:
Adaptive Forceadaptation to external force impactmuscular activityneuromuscular pre-activationpower improvement

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Area of Science:

  • Sports Science
  • Biomechanics
  • Human Physiology

Background:

  • Improving athletic power is crucial for performance.
  • Understanding muscular activity mechanisms is key to developing effective training methods.
  • Eccentric muscle actions are vital in sports requiring rapid force adaptation.

Purpose of the Study:

  • To investigate the effect of pre-activation on maximal explosive eccentric Adaptive Force (xpAFeccmax).
  • To determine if pre-activation enhances power capabilities by combining various power-enhancing mechanisms.
  • To explore the relationship between pre-activation levels and xpAFeccmax in the quadriceps femoris muscle.

Main Methods:

  • Utilized an innovative pneumatic device to measure xpAFeccmax during an isometric hold transitioning to eccentric action.
  • Assessed 20 subjects across three randomized pre-activation levels (0.4, 0.8, 1.2 bar) of the quadriceps femoris.
  • Measured maximal voluntary isometric contraction (MVIC) and compared torque values of xpAFeccmax across pre-activation conditions.

Main Results:

  • A significant positive correlation was found between quadriceps femoris pre-activation and xpAFeccmax in both males and females (p < 0.001).
  • Average torque increase from MVIC to xpAFeccmax with pre-pressure level 1 was +28.15 ± 25.4%.
  • Higher pre-activation levels showed a significant increase in force outcome prior to eccentric load.

Conclusions:

  • Pre-activation of the quadriceps femoris muscle positively influences maximal explosive eccentric adaptive force.
  • Controlled muscular activation before an impulse-like eccentric load can lead to immediate increases in force production.
  • Findings suggest potential applications for pre-activation strategies in athletic training to enhance power and performance.