التفاصيل البيبلوغرافية
| العنوان: |
Joint Contribution to Fingertip Movement During a Number Entry Task: An Application of Jacobian Matrix. |
| المؤلفون: |
Jin Qin, Trudeau, Matthew, Buchholz, Bryan, Katz, Jeffrey N., Xu Xu, Dennerlein, Jack T. |
| المصدر: |
Journal of Applied Biomechanics; Apr2014, Vol. 30 Issue 2, p338-342, 5p, 1 Diagram, 3 Charts, 1 Graph |
| مصطلحات موضوعية: |
ELBOW physiology, SHOULDER joint, WRIST physiology, METACARPOPHALANGEAL joint, KEYBOARDS (Electronics), KINEMATICS, LONGITUDINAL method, RESEARCH funding, MOTION capture (Human mechanics), DATA analysis software, PHYSIOLOGY |
| مستخلص: |
Upper extremity kinematics during keyboard use is associated with musculoskeletal health among computer users; however, specific kinematics patterns are unclear. This study aimed to determine the dynamic roles of the shoulder, elbow, wrist and metacarpophalangeal (MCP) joints during a number entry task. Six subjects typed in phone numbers using their right index finger on a stand-alone numeric keypad. The contribution of each joint of the upper extremity to the fingertip movement during the task was calculated from the joint angle trajectory and the Jacobian matrix of a nine-degree-of-freedom kinematic representation of the finger, hand, forearm and upper arm. The results indicated that in the vertical direction where the greatest fingertip movement occurred, the MCP, wrist, elbow (including forearm) and shoulder joint contributed 10.2%, 55.6%, 27.7% and 6.5%, respectively, to the downward motion of the index finger averaged across subjects. The results demonstrated that the wrist and elbow contribute the most to the fingertip vertical movement, indicating that they play a major role in the keying motion and have a dynamic load beyond maintaining posture. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Biomechanics is the property of Human Kinetics Publishers, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
