The effect of actual and imaginary handgrip on postural stability during different balance conditions.
Identifieur interne : 000D66 ( Main/Merge ); précédent : 000D65; suivant : 000D67The effect of actual and imaginary handgrip on postural stability during different balance conditions.
Auteurs : M S Vanderhill [États-Unis] ; E E Wolf [États-Unis] ; J E Langenderfer [États-Unis] ; K I Ustinova [États-Unis]Source :
- Gait & posture [ 1879-2219 ] ; 2014.
English descriptors
- KwdEn :
- MESH :
- physiology : Hand Strength, Postural Balance, Psychomotor Performance.
- Attention, Female, Humans, Imagination, Male, Task Performance and Analysis, Young Adult.
Abstract
The stabilizing effect of holding an object on upright posture has been demonstrated in a variety of settings. The mechanism of this effect is unknown but could be attributed to either additional sensorimotor activity triggered by a hand contact or cognitive efforts related to performance of a supra-postural task. A potential mechanism was investigated by comparing postural stability in young healthy individuals while gripping a custom instrumented wooden stick with a 5N force and while imagining holding the same stick in the hand. Twenty subjects were tested during three standing balance conditions: on a stationary surface, on a freely moving rockerboard, and with an unexpected perturbation of 10° forward rockerboard tipping. Postural stability was evaluated as velocity of the center of mass (COM) and center of pressure (COP) compared across all experimental conditions. COM and COP velocities were equally reduced when subjects gripped the stick and imagined gripping while standing stationary and on the rockerboard. When perturbed, subjects failed to show any postural stability improvements regardless of handgrip task. Results indicate a stabilizing effect of focusing attention on motor task performance. This cognitive strategy does not appear to contribute any additional stabilization when subjects are perturbed. This study adds to the current understanding of postural stabilization strategies.
DOI: 10.1016/j.gaitpost.2014.07.015
PubMed: 25115647
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Pleasant, MI, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physical Therapy, Central Michigan University, Mt. Pleasant, MI</wicri:regionArea><placeName><region type="state">Michigan</region></placeName></affiliation></author><author><name sortKey="Wolf, E E" sort="Wolf, E E" uniqKey="Wolf E" first="E E" last="Wolf">E E Wolf</name><affiliation wicri:level="2"><nlm:affiliation>Neuroscience Program, Central Michigan University, Mt. Pleasant, MI, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Neuroscience Program, Central Michigan University, Mt. Pleasant, MI</wicri:regionArea><placeName><region type="state">Michigan</region></placeName></affiliation></author><author><name sortKey="Langenderfer, J E" sort="Langenderfer, J E" uniqKey="Langenderfer J" first="J E" last="Langenderfer">J E Langenderfer</name><affiliation wicri:level="2"><nlm:affiliation>School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI</wicri:regionArea><placeName><region type="state">Michigan</region></placeName></affiliation></author><author><name sortKey="Ustinova, K I" sort="Ustinova, K I" uniqKey="Ustinova K" first="K I" last="Ustinova">K I Ustinova</name><affiliation wicri:level="2"><nlm:affiliation>Department of Physical Therapy, Central Michigan University, Mt. Pleasant, MI, USA; Neuroscience Program, Central Michigan University, Mt. Pleasant, MI, USA. Electronic address: ustin1k@cmich.edu.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physical Therapy, Central Michigan University, Mt. Pleasant, MI, USA; Neuroscience Program, Central Michigan University, Mt. Pleasant, MI</wicri:regionArea><placeName><region type="state">Michigan</region></placeName></affiliation></author></analytic><series><title level="j">Gait & posture</title><idno type="eISSN">1879-2219</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Attention</term><term>Female</term><term>Hand Strength (physiology)</term><term>Humans</term><term>Imagination</term><term>Male</term><term>Postural Balance (physiology)</term><term>Psychomotor Performance (physiology)</term><term>Task Performance and Analysis</term><term>Young Adult</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Hand Strength</term><term>Postural Balance</term><term>Psychomotor Performance</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Attention</term><term>Female</term><term>Humans</term><term>Imagination</term><term>Male</term><term>Task Performance and Analysis</term><term>Young Adult</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The stabilizing effect of holding an object on upright posture has been demonstrated in a variety of settings. The mechanism of this effect is unknown but could be attributed to either additional sensorimotor activity triggered by a hand contact or cognitive efforts related to performance of a supra-postural task. A potential mechanism was investigated by comparing postural stability in young healthy individuals while gripping a custom instrumented wooden stick with a 5N force and while imagining holding the same stick in the hand. Twenty subjects were tested during three standing balance conditions: on a stationary surface, on a freely moving rockerboard, and with an unexpected perturbation of 10° forward rockerboard tipping. Postural stability was evaluated as velocity of the center of mass (COM) and center of pressure (COP) compared across all experimental conditions. COM and COP velocities were equally reduced when subjects gripped the stick and imagined gripping while standing stationary and on the rockerboard. When perturbed, subjects failed to show any postural stability improvements regardless of handgrip task. Results indicate a stabilizing effect of focusing attention on motor task performance. This cognitive strategy does not appear to contribute any additional stabilization when subjects are perturbed. This study adds to the current understanding of postural stabilization strategies.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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