Related Experiment Video
Updated: Feb 12, 2026
06:21
Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings
Published on: July 26, 2022
3.1K
Consecutive postural adjustments (CPAs): A kinetic analysis of variable velocity during a pointing task
Paul Fourcade1, Simon Bouisset2, Serge Le Bozec1
1CIAMS, université Paris-Sud, université Paris-Saclay, 91405 Orsay cedex, France; CIAMS, université d'Orléans, Orléans, France.
Neurophysiologie Clinique = Clinical Neurophysiology
|April 3, 2018
Summary
Consecutive postural adjustments (CPAs) stabilize the body after voluntary movements. Their impulse and amplitude increase with movement velocity, suggesting programmed postural control, which may differ in motor impairments.
Area of Science:
- Biomechanics
- Motor Control
- Human Physiology
Background:
- Postural adjustments are crucial for maintaining balance during and after voluntary movements.
- Consecutive postural adjustments (CPAs) occur after movement cessation, but their precise role and programming are not fully understood.
- Anticipatory postural adjustments (APAs) precede voluntary movements, providing a contrast to CPAs.
Purpose of the Study:
- To investigate the role of CPAs in counterbalancing destabilizing effects of voluntary movements.
- To compare the characteristics of CPAs with APAs to gain insights into postural programming.
- To examine how movement velocity influences CPAs.
Main Methods:
- Nine healthy adults performed pointing movements at varying velocities in a sitting position.
- Measured antero-posterior ground reaction forces and upper limb kinematics.
- Analyzed linear impulses, peak amplitudes, and durations of CPAs and APAs.
Main Results:
- CPA impulse was negative, while APA impulse was positive, with similar absolute values.
- Increased movement velocity led to significant increases in CPA impulse and peak amplitude, but not duration.
- APA impulse, peak amplitude, and duration all increased with movement velocity.
Conclusions:
- Findings support the hypothesis that CPAs are essential for body stabilization.
- Postural chain kinetics appear to be programmed based on focal movement velocity.
- Understanding CPAs in healthy individuals can inform the study of motor impairments.
Related Concept Videos
03:07Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy
30.0K
The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
30.0K
01:11Variability: Analysis
527
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
The range is a simple measure of variability, indicating the difference between the highest and...
527
01:19Enzyme Kinetics
104.4K
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
104.4K
01:24Relative Motion Analysis - Velocity
759
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
759
01:25The Anchoring-and-Adjustment Heuristic
7.8K
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
7.8K
01:12Adjusting a Traverse
389
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
389