Document Detail

Biomechanical analyses of rising from a chair.
MedLine Citation:
PMID:  1491016     Owner:  NLM     Status:  MEDLINE    
Quantification of the biomechanical factors that underlie the inability to rise from a chair can help explain why this disability occurs and can aid in the design of chairs and of therapeutic intervention programs. Experimental data collected earlier from 17 young adult and two groups of elderly subjects, 23 healthy and 11 impaired, rising from a standard chair under controlled conditions were analyzed using a planar biomechanical model. The joint torque strength requirements and the location of the floor reaction force at liftoff from the seat in the different groups and under several conditions were calculated. Analyses were also made of how body configurations and the use of hand force affect these joint torques and reaction locations. In all three groups, the required torques at liftoff were modest compared to literature data on voluntary strengths. Among the three groups rising with the use of hands, at the time of liftoff from the seat, the impaired old subjects, on an average, placed the reaction force the most anterior, the healthy old subjects placed it intermediately and the young subjects placed it the least anterior, within the foot support area. Moreover, the results suggest that, at liftoff, all subjects placed more importance on locating the floor reaction force to achieve acceptable postural stability than on diminishing the magnitudes of the needed joint muscle strengths.
A B Schultz; N B Alexander; J A Ashton-Miller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of biomechanics     Volume:  25     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  1992 Dec 
Date Detail:
Created Date:  1993-02-26     Completed Date:  1993-02-26     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1383-91     Citation Subset:  IM; S    
Department of Mechanical Engineering and Applied Mechanics. University of Michigan, Ann Arbor 48109-2125.
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MeSH Terms
Ankle Joint / physiology
Foot / physiology
Hand / physiology
Hip Joint / physiology
Interior Design and Furnishings
Joints / physiology*
Knee Joint / physiology
Leg / physiology
Models, Biological
Posture / physiology*
Shoulder Joint / physiology
Stress, Mechanical
Grant Support

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