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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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.
|Title:||Task-specific recruitment of motor units for vibration damping|
|Journal or Publication Title:||Journal of Biomechanics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1342-1346|
|Keywords:||Vibration, Motor control, Walking, Muscle Recruintment, Damping|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|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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