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Task-specific recruitment of motor units for vibration damping

Wakeling, James and Liphardt, Anna-Maria (2006) Task-specific recruitment of motor units for vibration damping. Journal of Biomechanics, 39, pp. 1342-1346.

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Abstract

Vibrations occur within the soft tissues of the lower extremities due to the heel-strike impact during walking. Increases in muscle activity in the lower extremities result in increased damping to reduce this vibration. The myoelectric intensity spectra were compared using principal component analysis from the tibialis anterior and lateral gastrocnemius of 40 subjects walking with different shoe conditions. The soft insert condition resulted in a significant, simultaneous increase in muscle activity with a shift to higher myoelectric frequencies in the period 0-60 ms after heel-strike which is the period when the greater vibration damping occurred. These increases in myoelectric frequency match the spectral patterns which indicate increases in recruitment of faster motor units. It is concluded that fast motor units are recruited during the task of damping the soft-tissue resonance that occurs following heel-strike.

Document Type:Article
Title:Task-specific recruitment of motor units for vibration damping
Authors:
AuthorsInstitution or Email of Authors
Wakeling, JamesUniversity of London
Liphardt, Anna-MariaUNSPECIFIED
Date:2006
Journal or Publication Title:Journal of Biomechanics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:39
Page Range:pp. 1342-1346
Status:Published
Keywords:Vibration, Motor control, Walking, Muscle Recruintment, Damping
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Space Physiology
Deposited By: Dr.rer.nat. Jochen Zange
Deposited On:19 Dec 2006
Last Modified:27 Apr 2009 13:22

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