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Updated: Jul 31, 2025

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Individual Muscle Force Differences During Loaded Hexbar Jumps: A Statistical Parametric Mapping Analysis.

Abigail K Salvadore1,2, Adam E Jagodinsky3, Michael R Torry3

  • 1Biomechanics Laboratory, Illinois State University, Normal, IL, USA. asalvadore@umass.edu.

Annals of Biomedical Engineering
|May 1, 2023
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Summary
This summary is machine-generated.

Understanding muscle force in hexbar jumps reveals how training loads impact performance. Increased load, especially at 20% 1-repetition maximum (1RM), proportionally boosts muscle output and absolute force in key leg muscles.

Keywords:
BiomechanicsMusculoskeletal modelingWeightlifting

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Computational Modeling

Background:

  • Individual muscle force knowledge is crucial for optimizing strength and conditioning.
  • Understanding muscle recruitment patterns informs training program design for specific outcomes.

Purpose of the Study:

  • To estimate individual muscle forces during hexbar jumps under varying external loads (0-60% of 1-repetition maximum).
  • To analyze how external load affects muscle force production during the concentric phase of the movement.

Main Methods:

  • Utilized in vivo motion capture and computational modeling for male participants.
  • Estimated muscle forces (gluteus maximus, biceps femoris, rectus femoris, vastus intermedius, gastrocnemius, soleus) using static optimization.
  • Analyzed changes in muscle forces across loading conditions using statistical parametric mapping (SPM), impulse, and peak values.

Main Results:

  • Different analysis methods (SPM, impulse, peaks) yielded varying conclusions on load effects.
  • Peak force values may be insufficient for assessing muscle force differences in dynamic movements.
  • Combined SPM and impulse analysis revealed increased total muscle output, proportionally highest at 20% 1RM, and greater absolute force in vasti and plantarflexors with increased load.

Conclusions:

  • Careful selection of analysis methods is essential for accurate interpretation of muscle force data.
  • Statistical parametric mapping combined with impulse provides a comprehensive assessment of muscle force responses to load.
  • Increased external load during hexbar jumps, particularly at lower percentages of 1RM, enhances muscle output and absolute force in specific lower limb muscles.