Constant angular velocity of the wrist during the lifting of a sphere

The primary objective of the experiments was to investigate the wrist motion of a person while they were carrying out a prehensile task from a clinical hand function test. A six-camera movement system was used to observe the wrist motion of 10 participants. A very light sphere and a heavy sphere wer...

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Bibliographic Details
Published in:Journal of medical engineering & technology 2010-05, Vol.34 (4), p.274-284
Main Authors: Chappell, P. H., Metcalf, C. D., Burridge, J. H., Yule, V. T., Pickering, R. M.
Format: Article
Language:English
Subjects:
Adult
Biomechanical Phenomena
Constant velocity
Humans
Lifting
Models, Theoretical
Movement
Movement - physiology
Projectile
SHAP
Wrist
Wrist - physiology
Young Adult
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Summary:The primary objective of the experiments was to investigate the wrist motion of a person while they were carrying out a prehensile task from a clinical hand function test. A six-camera movement system was used to observe the wrist motion of 10 participants. A very light sphere and a heavy sphere were used in the experiments to study any mass effects. While seated at a table, a participant moved a sphere over a small obstacle using their dominant hand. The participants were observed to move their wrist at a constant angular velocity. This phenomenon has not been reported previously. Theoretically, the muscles of the wrist provide an impulse of force at the start of the rotation while the forearm maintains a constant vertical force on a sphere. Light-heavy mean differences for the velocities, absolute velocities, angles and times taken showed no significant differences (p = 0.05).
ISSN:0309-1902
1464-522X
DOI:10.3109/03091901003663844