CUED Publications database

Measuring stiffness during arm movements in various dynamic environments

Burdet, E and Osu, R and Franklin, D and Milner, TE and Kawato, M (1999) Measuring stiffness during arm movements in various dynamic environments. In: UNSPECIFIED pp. 421-428..

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The technique presented in this paper enables a simple, accurate and unbiased measurement of hand stiffness during human arm movements. Using a computer-controlled mechanical interface, the hand is shifted relative to a prediction of the undisturbed trajectory. Stiffness is then computed as the restoring force divided by the position amplitude of the perturbation. A precise prediction algorithm insures the measurement quality. We used this technique to measure stiffness in free movements and after adaptation to a linear velocity dependent force field. The subjects compensated for the external force by co-contracting muscles selectively. The stiffness geometry changed with learning and stiffness tended to increase in the direction of the external force.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:42
Last Modified: 07 Mar 2019 14:18