NDLI: Effects of environmental instabilities on endpoint stiffness during the maintenance of human arm posture

Content Provider	IEEE Xplore Digital Library
Author	Krutky, M.A. Trumbower, R.D. Perreault, E.J.
Copyright Year	2009
Description	Author affiliation: Sensory Motor Performance Program at The Rehabilitation Institute of Chicago and Department of Biomedical Engineering at Northwestern University, Evanston, IL 60611 (Krutky, M.A.) \|\| Sensory Motor Performance Program at The Rehabilitation Institute of Chicago, Chicago, IL 60611 (Trumbower, R.D.) \|\| Sensory Motor Performance Program at The Rehabilitation Institute of Chicago and Departments of Biomedical Engineering and Physical Medicine & Rehabilitation at Northwestern University, Chicago, IL 60611 (Perreault, E.J.)
Abstract	Using the upper limb to manipulate objects or tools requires maintenance of stable arm posture. The ability to maintain stable postures is dependent on the mechanical properties of the arm, which can be characterized by estimates of endpoint stiffness. In this study we quantified the endpoint stiffness of the human arm during postural interactions with mechanically imposed unstable loads. The purpose was to determine the extent to which arm stiffness is adapted according to the mechanical properties of the environment during postural tasks. We estimated the endpoint stiffness of the right arms of eight subjects as they interacted with four haptic environments: rigid, unstable along the direction of maximal endpoint stiffness and orthogonal to this direction, and a high-strength unstable environment also aligned to the orientation of maximal endpoint stiffness. The size and orientation of endpoint stiffness were quantified for each haptic condition. Stiffness size was increased along the directions of the destabilizing environments (p<0.003). However, the environments had no significant effect on stiffness orientation (p>0.26). These findings suggest that at a fixed posture interactions with unstable environments can induce moderate, task-appropriate changes in limb mechanics that are tuned to the environment. However, these changes are small relative to those that can be obtained by changing limb posture.
Starting Page	5938
Ending Page	5941
File Size	872275
Page Count	4
File Format	PDF
ISBN	9781424432967
ISSN	1557170X
DOI	10.1109/IEMBS.2009.5334751
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humans Robots Mechanical factors Haptic interfaces Arm Motion analysis USA Councils Position measurement History Orthopedic surgery
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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