Are amplitude and duration of anticipatory postural adjustments identically scaled to focal movement parameters in humans?

Anticipatory postural adjustments (APA), are known to precede the onset of voluntary movement. The aim of this study was to determine whether APA amplitude and duration are programmed identically according to the voluntary movement parameters. Subjects performed shoulder flexions at maximal and sub-...

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Bibliographic Details
Published inNeuroscience letters Vol. 278; no. 3; pp. 153 - 156
Main Authors Bouisset, Simon, Richardson, James, Zattara, Maurice
Format Journal Article
LanguageEnglish
Published Shannon Elsevier Ireland Ltd 14.01.2000
Elsevier
Subjects
Adult
Anticipatory postural adjustments
Arm - physiology
Biological and medical sciences
Biomechanical parameters
Biomechanical Phenomena
Female
Fundamental and applied biological sciences. Psychology
Humans
Kinetics
Male
Motor program
Movement - physiology
Movement control
Posture - physiology
Shoulder - physiology
Time Factors
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Weight Lifting - physiology
Biomechanical parameters
Anticipatory postural adjustments
Movement control
Motor program
Amplitude
Biomechanics
Human
Duration
Postural fitting
Motor control
Posture
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ISSN0304-3940
1872-7972
DOI10.1016/S0304-3940(99)00912-X

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Summary:Anticipatory postural adjustments (APA), are known to precede the onset of voluntary movement. The aim of this study was to determine whether APA amplitude and duration are programmed identically according to the voluntary movement parameters. Subjects performed shoulder flexions at maximal and sub-maximal velocities, with and without an additional inertial load. APA amplitude and duration were plotted against kinetic energy and work of the forthcoming voluntary limb movement and showed a significant linear relation. When APA duration was plotted against mechanical work, two distinct APA duration values corresponded to a given value of work depending on the weight of the load, but this was not the case for APA amplitude. It is suggested that the APA amplitude and duration are scaled according to the same movement parameters, but not in the same way, APA duration being additionally sensitive to the postural effect which results from an additional weight.
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ISSN:0304-3940
1872-7972
DOI:10.1016/S0304-3940(99)00912-X