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Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings

Published on: July 26, 2022

Are simultaneous postural adjustments (SPA) programmed as a function of pointing velocity?

Paul Fourcade¹, Serge Le Bozec², Simon Bouisset³

¹UFR STAPS, Université Paris-Sud, 91405, Orsay, France. paul.fourcade@u-psud.fr.

Experimental Brain Research

|May 26, 2016

Summary

Movement velocity influences how the body stabilizes during voluntary actions. Faster movements require quicker postural adjustments, suggesting coordinated programming between the limb and body for efficiency.

Keywords:

Pointing movement Postural kinetics Simultaneous postural adjustments (SPA)Task velocity

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Area of Science:

Biomechanics
Human Movement Science
Motor Control

Background:

Voluntary movements involve complex interactions between limb motion and body stabilization.
Simultaneous postural adjustments (SPA) are crucial for maintaining balance during dynamic tasks.

Purpose of the Study:

To investigate the influence of movement velocity on simultaneous postural adjustments (SPA).
To understand the relationship between focal limb movement and postural chain kinetics at varying speeds.

Main Methods:

A pointing task was performed at different velocities, recording upper limb kinematics and body kinetics.
A 2-degree-of-freedom (DOF) model divided the body into focal (upper limb) and postural (rest of body) chains.
Kinetics of both subsystems (shoulder action and reaction) were calculated and analyzed.

Main Results:

Both shoulder action (AoSh) and reaction (RoSh) exhibited similar diphasic profiles that varied with movement velocity.
RoSh consistently preceded AoSh, with this phase advance decreasing as focal movement velocity increased.
SPA demonstrated a dual role: propulsion during acceleration and stabilization during deceleration.

Conclusions:

Postural adjustments are programmed based on task velocity, similar to the focal movement.
The focal and postural chains coordinate their actions to enhance task efficiency.
Movement velocity is a key factor modulating the timing and role of simultaneous postural adjustments.