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Controlling the Ground Reaction Force During Lifting.

H. M. Toussaint1, D. A. C. M. Commissaris, J. H. Van Dieeumlant;n

  • 1Department of Health Science, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands. h_m_toussaint@fbw.vu.nl

Journal of Motor Behavior
|September 1, 1995
PubMed
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During dynamic back-lifting, the ground reaction force (Fsubg;) vector is controlled away from the center of gravity (CoG) to manage the body's angular momentum. This differs from static tasks where Fsubg; aligns with the CoG.

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Kinesiology

Background:

  • Understanding how the body controls movement is crucial for injury prevention and performance enhancement.
  • Previous research often focused on static postures, leaving dynamic control mechanisms less understood.

Purpose of the Study:

  • To investigate the control strategy of the ground reaction force (Fsubg;) vector relative to the center of gravity (CoG) during a dynamic back-lifting task.
  • To determine if multisegment body movements in dynamic tasks involve angular momentum control.

Main Methods:

  • Six male subjects performed repetitive barbell back-lifting.
  • A biomechanical analysis using a linked segment model was employed.
  • The rate of change of the whole body's angular momentum was calculated.

Related Experiment Videos

Main Results:

  • Summed rotations of body segments generated a specific rate of change in angular momentum.
  • This change in angular momentum was found to equal the external moment provided by the Fsubg; relative to the CoG.
  • The Fsubg; vector was directed away from the CoG during the dynamic lifting task.

Conclusions:

  • Multisegment movements in dynamic tasks are controlled by managing the entire body's angular momentum.
  • The Fsubg; vector is intentionally directed away from the CoG during dynamic lifting, unlike in static tasks.
  • This finding highlights a key difference in motor control strategies between static and dynamic activities.