Biomechanical Factors Affecting the Peak Hand Reaction Force During the Bimanual Arrest of a Moving Mass

[+] Author and Article Information
Kurt M. DeGoede

Biomechanics Research Laboratory, Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109e-mail: degoedek@etown.edu

James A. Ashton-Miller, Albert B. Schultz

Biomechanics Research Laboratory, Department of Mechanical Engineering, Institute of Gerontology, University of Michigan, Ann Arbor, MI 48109

Neil B. Alexander

Geriatrics Section, Department of Internal Medicine, Institute of Gerontology, University of Michigan, Ann Arbor, MI 48109

J Biomech Eng 124(1), 107-112 (Oct 02, 2001) (6 pages) doi:10.1115/1.1427702 History: Received October 06, 1999; Revised October 02, 2001
Copyright © 2002 by ASME
Topics: Force , Biomechanics
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Experimental setup: Subjects were seated in a high-back, rigid, chair and arrested an oncoming-instrumented ballistic pendulum with both hands. Subjects were asked to use one of three different initial elbow angles (130 deg, 150 deg, and 170 deg) and the pendulum was dropped from one of three different heights to produce impact velocities of 1.8, 2.3, or 3.0 m/s.
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Forward dynamics model: The experimental protocol was modeled with a three degree-of-freedom model. The lumped mass, M, represented the effective half-mass of the pendulum acting on one arm, and XM indicated the position of that mass relative to the torso. This mass was constrained to move in the anterior-posterior direction only. The two arm segments were modeled as rigid links constrained to translate in the AP direction only at the equivalent wrist and shoulder joints. The position of the massless slider at the wrist relative to the lumped mass was described by XH. The meanings of the other symbols can be found in the text.
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Typical experimental (left, A–C) and corresponding model (right, D–F) simulation responses for an older male arresting an impact of 2.3 m/s
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Effect of elbow angle and impact velocity on peak hand impact force. The regression lines from each subject group are shown here: the lower black lines indicate the 1.8 m/s impact velocity trials; the gray lines-the 2.3 m/s impacts; and the upper black lines-the 3.0 m/s impact velocity trials.




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