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Precision Grip Control while Walking Down a Stair Step

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Ebner Karestinos, Daniela Silvia [UCL] Thonnard, Jean-Louis [UCL] Bleyenheuft, Yannick [UCL]

The aim of this study was to determine whether the internal model regulating grip force (GF)/load force (LF) coordination during a brisk load increase is preserved when the lower extremities produce a perturbation during a single step-down task. We observed the coordination of the vertical ground reaction force (vGRF), GF and LF while holding a handheld object during a single step-down task. The 3 forces (vGRF, GF and LF) decreased during the start of the task. While the subject was descending, LF and GF became dissociated from vGRF and increased in value, probably to anticipate the first foot contact. Coordination of LF and GF was maintained until the maximal vGRF (knee extension). LF peaked in the same time window as vGRF, whereas GF peaked about 70 ms later. This desynchronization, which was previously observed in direct load increase on a handheld object, was interpreted to be a predictive action to ensure the smooth management of the brisk increase in load induced by the lower extremities. Incidentally, in this group, kinematic and dynamic differences were observed between men and women, which may highlight a gender-specific strategy to perform the step-down task. In conclusion, these results suggest that the internal model of precision grip is able to integrate a brisk load change, whatever its origin, and regulate the forces to provide an ideal GF to dampen a brisk load increase and secure the object.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2016
Language Anglais
Journal information "PLoS One" - Vol. 11, no. 11, p. e0165549 [1-13] (2016)
Peer reviewed yes
Publisher Public Library of Science ((United States) Philadelphia, PA)
issn 1932-6203
e-issn 1932-6203
Publication status Publié
Affiliations UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience
UCL - (SLuc) Service de médecine physique et de réadaptation motrice
Louvain Bionics - Center of Interdisciplinary Expertise
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Bibliographic reference Ebner Karestinos, Daniela Silvia ; Thonnard, Jean-Louis ; Bleyenheuft, Yannick. Precision Grip Control while Walking Down a Stair Step. In: PLoS One, Vol. 11, no. 11, p. e0165549 [1-13] (2016)
Permanent URL http://hdl.handle.net/2078.1/178887