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Trunk stiffness increases with steady-state effort.

M G Gardner-Morse1, I A Stokes

  • 1Department of Orthopaedics and Rehabilitation, University of Vermont, Burlington, VT 05405-0084, USA. gardnerm@med.uvm.edu

Journal of Biomechanics
|March 27, 2001
PubMed
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Increased muscle effort significantly enhances trunk stiffness in healthy adults. This study demonstrates that higher steady-state preload efforts lead to greater trunk stiffness, crucial for stability.

Area of Science:

  • Biomechanics
  • Human Physiology
  • Musculoskeletal System

Background:

  • Trunk stability is vital for daily activities and injury prevention.
  • Muscle coactivation is theorized to increase trunk stiffness and stability.
  • Understanding trunk stiffness dynamics is essential for rehabilitation and performance.

Purpose of the Study:

  • To investigate the relationship between steady-state preload effort and trunk stiffness in healthy humans.
  • To determine if increased muscle activation at higher efforts enhances trunk stiffness.
  • To quantify changes in trunk stiffness under varying loading conditions.

Main Methods:

  • Fourteen healthy subjects were subjected to horizontal force perturbations.
  • Trunk stiffness was measured using a second-order differential equation model.

Related Experiment Videos

  • Subjects were loaded at different horizontal directions and steady-state preload efforts (20% and 40% of maximum).

    • Main Results:

    • Trunk-driving point stiffness increased by an average of 36.8% when preload effort rose from 20% to 40%.
    • A significant relationship was found between increased steady-state effort and enhanced trunk stiffness (p<0.001).
    • Trunk stiffness showed minor but significant variations with different loading directions.

    Conclusions:

    • Higher steady-state preload efforts significantly increase trunk stiffness in healthy individuals.
    • The observed increase in stiffness is likely due to heightened muscle stiffness from increased muscle activation.
    • These findings have implications for understanding trunk stability and developing targeted interventions.