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Is the center of gravity controlled during upper trunk movements?
S Vernazza1, A Alexandrov, J Massion
1Laboratory of Neurobiology and Movement, CNRS, Marseille, France.
Neuroscience Letters
|March 15, 1996
Summary
This study investigated how the body controls equilibrium during trunk movements. Findings suggest the central nervous system evaluates segment weight, adjusting movement patterns to maintain center of gravity (CG) control.
Area of Science:
- Biomechanics
- Neuroscience
- Human Movement Science
Background:
- Maintaining balance during body movements is crucial for stability.
- Upper trunk movements involve complex coordination to control the body's center of gravity (CG).
Purpose of the Study:
- To determine if kinematic synergies for equilibrium control during trunk movements involve evaluating body segment weight.
- To investigate the role of sensory input in adapting movement strategies based on load.
Main Methods:
- Five adult subjects performed forward and backward trunk bending (approx. 35 degrees).
- Movements were performed without load and with a 10 kg load on the shoulders.
- The sagittal shift of the center of gravity (CG) was measured and compared between loaded and unloaded conditions.
Main Results:
- Two distinct patterns of CG shift were observed.
- In one pattern, CG shift was similar with and without load.
- In the second pattern, CG shift increased mechanically with the load, indicating adaptation.
Conclusions:
- The body appears to evaluate the actual weight of segments using sensory inputs.
- This evaluation influences kinematic synergies to maintain CG control during upper trunk movements.
- Adaptation of movement strategies suggests a sophisticated feedback system for balance control.