Document Detail

Lifting strategy and stability in strength-impaired elders.
MedLine Citation:
PMID:  11295889     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: Ninety-six subjects underwent biomechanical analysis of freestyle box lifting. OBJECTIVES: To relate lifting strategy to lower extremity muscle strength and postural stability in functionally limited elders. SUMMARY OF BACKGROUND DATA: Back pain and postural instability in elders is rampant and poorly understood. Much of the literature on lifting relates to young subjects. METHODS: Lifting strategy for 91 functionally limited elders was classified by timing of peak power in the back and knee joints. Isometric hip and knee extensor strength and postural stability were compared among strategy classifications. Postural stability was analyzed by measuring center of gravity (CG) displacement during lifting. RESULTS: Three lift strategy groups were established: back-lift, or back dominant strategy (BDS); leg-lift, or leg dominant strategy (LDS); and leg-dominant back-first mixed strategy (LDB). Subjects with relatively strong hip and knee extensors used leg dominant strategy; subjects with relatively strong knee, but weak hip, extensors used leg-dominant back-first mixed strategy; and subjects with weak hip and knee extensors used back dominant strategy. Leg dominant strategy and leg-dominant back-first mixed strategy engendered less center of gravity displacement and thus were posturally more stable than the back dominant strategy. CONCLUSION: Subjects apparently chose their lift strategy based on their hip and knee extensor strength. Weaker elders using a less stable back dominant strategy could be susceptible to falls and subsequent long bone and vertebral body fractures. Clinicians could identify at-risk elders by muscle testing. Beyond emphasizing strength and endurance exercise in elderly patients, weak elders should be taught to use a leg dominant lifting strategy, or if they are not physically able, to use a combined back/leg strategy.
M S Puniello; C A McGibbon; D E Krebs
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Spine     Volume:  26     ISSN:  0362-2436     ISO Abbreviation:  Spine     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-04-11     Completed Date:  2001-07-19     Revised Date:  2009-07-09    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  731-7     Citation Subset:  IM; S    
Massachusetts General Hospital Biomotion Laboratory and the MGH Institute of Health Professions, Boston 02114-4719, USA.
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MeSH Terms
Aged, 80 and over
Back / physiology
Frail Elderly*
Joints / physiology
Leg / physiology
Middle Aged
Comment In:
Spine (Phila Pa 1976). 2002 Feb 1;27(3):330-1   [PMID:  11805704 ]

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