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Is the Force-Velocity Profile for Free Jumping a Sound Basis for Individualized Jump Training Prescriptions?

Maarten F Bobbert1, Kolbjørn Lindberg2, Gøran Paulsen3

  • 1Faculty of Behavioural and Movement Sciences, Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, THE NETHERLANDS.

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Individualized jump training may not improve athletic performance as claimed. The study suggests that apparent improvements in the force-velocity profile are likely due to skill acquisition, not actual changes in muscle properties.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement

Background:

  • Individualized optimized jump training prescriptions based on the force-velocity profile are popular but their effectiveness is debated.
  • These programs reportedly have opposing effects on maximal average force and maximal average shortening velocity.

Purpose of the Study:

  • To investigate training-induced neuromuscular changes that could explain the contested effects of individualized optimized jump training.
  • To determine if simulated improvements in muscle properties or initial postures can replicate reported force-velocity profile changes.

Main Methods:

  • A musculoskeletal simulation model with four body segments and six muscle-tendon actuators was used to simulate vertical squat jumps under various loads.
  • Muscle stimulation over time was independently controlled and optimized for maximal jump height.
  • The force-velocity profile was determined for a reference model and analyzed for changes based on modified muscle properties and initial postures.

Main Results:

  • Reported training effects could not be reproduced by realistically improving muscle properties or modifying initial postures.
  • The force-velocity profile demonstrated high sensitivity to jump height gains at low loads versus high loads, or vice versa.
  • Maximal jump height requires skill, and submaximal performance due to lack of skill may cause pre-training profile imbalances.

Conclusions:

  • If individualized optimized training success stems from selective skill improvements, training effects may not generalize to other tasks.
  • Individualized optimized training may not offer superior benefits compared to other training methodologies.