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Task Dependency of Grip Stiffness—A Study of Human Grip Force and Grip Stiffness Dependency during Two Different Tasks with Same Grip Forces

Höppner, Hannes und McIntyre, Joseph und van der Smagt, Patrick (2013) Task Dependency of Grip Stiffness—A Study of Human Grip Force and Grip Stiffness Dependency during Two Different Tasks with Same Grip Forces. PLoS One, 8 (12), e80889. Public Library of Science. DOI: [10.1371/journal.pone.0080889]. ISSN 1932-6203.

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Offizielle URL: http://dx.doi.org/10.1371%2Fjournal.pone.0080889

Kurzfassung

It is widely known that the pinch-grip forces of the human hand are linearly related to the weight of the grasped object. Less is known about the relationship between grip force and grip <italic>stiffness</italic>. We set out to determine variations to these dependencies in different tasks with and without visual feedback. In two different settings, subjects were asked to (a) grasp and hold a stiffness-measuring manipulandum with a predefined grip force, differing from experiment to experiment, or (b) grasp and hold this manipulandum of which we varied the weight between trials in a more natural task. Both situations led to grip forces in comparable ranges. As the measured grip stiffness is the result of muscle and tendon properties, and since muscle/tendon stiffness increases more-or-less linearly as a function of muscle force, we found, as might be predicted, a linear relationship between grip force and grip stiffness. However, the measured stiffness ranges and the increase of stiffness with grip force varied significantly between the two tasks. Furthermore, we found a strong correlation between regression slope and mean stiffness for the force task which we ascribe to a force stiffness curve going through the origin. Based on a biomechanical model, we attributed the difference between both tasks to changes in wrist configuration, rather than to changes in cocontraction. In a new set of experiments where we prevent the wrist from moving by fixing it and resting it on a pedestal, we found subjects exhibiting similar stiffness/force characteristics in both tasks.</p>

Dokumentart:Zeitschriftenbeitrag
Titel:Task Dependency of Grip Stiffness—A Study of Human Grip Force and Grip Stiffness Dependency during Two Different Tasks with Same Grip Forces
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Höppner, Hanneshannes.hoeppner@dlr.deNICHT SPEZIFIZIERT
McIntyre, JosephNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
van der Smagt, PatrickNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Dezember 2013
Erschienen in:PLoS One
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:8
DOI :[10.1371/journal.pone.0080889]
Seitenbereich:e80889
Verlag:Public Library of Science
ISSN:1932-6203
Status:veröffentlicht
Stichwörter:Grip Stiffness; Finger Stiffness; Grasp Perturbator; Force Task; Weight Task; Wrist/Finger Configuration; Cocontraction; Human Stiffness; Human Impedance
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Technik für Raumfahrtsysteme
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R SY - Technik für Raumfahrtsysteme
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Weiterentwicklung Robotik - Mechatronik und Dynamik
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Robotik und Mechatronik > Mechatronische Komponenten und Systeme
Hinterlegt von: Höppner, Hannes
Hinterlegt am:20 Aug 2014 14:57
Letzte Änderung:20 Aug 2014 14:57

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