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Related Experiment Video

Updated: May 26, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Reaching while standing in microgravity: a new postural solution to oversimplify movement control.

Claudia Casellato1, Michele Tagliabue, Alessandra Pedrocchi

  • 1Bioengineering Department, NearLab, Politecnico di Milano, P.za Leonardo Da Vinci 32, 20133 Milan, Italy. claudia.casellato@mail.polimi.it

Experimental Brain Research
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Gravity significantly impacts the coordination between arm movements and postural control. While the hand trajectory adapts, balance strategies change in microgravity, weakening movement-posture coupling.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Human Physiology

Background:

  • Arm movements and postural control exhibit strong invariants and are coordinated during tasks requiring both.
  • Focal and postural invariants are linked to gravity, but its role in their coordination is less understood.
  • It remains unclear if gravity's influence on movement components maintains coordination across different gravitational conditions.

Purpose of the Study:

  • To analyze the coordination between arm movements and postural control in microgravity.
  • To investigate the role of gravity in maintaining motor synergism between focal and postural systems.
  • To determine if movement-posture coupling is hardwired or adaptable to altered gravitational environments.

Main Methods:

  • Eleven standing subjects performed reaching tasks in normal gravity and microgravity.
  • Kinematic and dynamic analyses were used to assess hand trajectory and postural control.
  • Movement-posture coordination was evaluated under different gravitational conditions.

Main Results:

  • Subjects adapted quickly to microgravity, successfully completing the reaching task.
  • Microgravity significantly altered postural strategies, making them incompatible with normal gravity balance constraints.
  • The distinct effects of gravity on focal and postural components led to a significant decrease in their coordination.

Conclusions:

  • Movement-posture coupling is influenced by gravity and is not a hardwired, invariant control mode.
  • Altered gravitational conditions necessitate new motor strategies, potentially involving global oversimplification of control.
  • The findings highlight the adaptability of the motor system to mechanical and sensory changes in different gravitational environments.