Document Detail

Kinetic analysis of the thumb in jar-opening activity among female adults.
MedLine Citation:
PMID:  18484399     Owner:  NLM     Status:  MEDLINE    
Jar opening is commonly viewed as a challenging task for female adults in daily living. The thumb plays a particular role in grasping the jar lid and leading the turning activity through opposition to the other digits. This study measured and compared the force, torque and torque contribution of the thumb in the activity under ordinary grasp patterns and jar-holding positions. A steel jar-like cylinder was custom made to measure the force and torque generated simultaneously by thumb and wrist. Sixteen young females without a history of hand injury were recruited as subjects. The force and torque of the thumb were found to be influenced significantly only by the grasp pattern but its torque contribution was significantly affected only by the jar-holding position. However, overall torque was influenced by both the grasp pattern and the jar-holding position. The torque contribution of the thumb under the four different grasp patterns and jar-holding positions was found to range from 17.4% to 23.9%. The contribution ratios suggest that the thumb may offer a force equivalent to the other digits rather than just a counter force in this activity.
Jer-Hao Chang; Kun-Yueh Ho; Fong-Chin Su
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ergonomics     Volume:  51     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-19     Completed Date:  2008-09-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  England    
Other Details:
Languages:  eng     Pagination:  843-57     Citation Subset:  IM; S    
Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.
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MeSH Terms
Hand Strength / physiology
Human Engineering
Product Packaging*
Task Performance and Analysis
Thumb / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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