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Can relative strength between the back and knees differentiate lifting strategy?

Authors
Li-K; Zhang-X
Source
Hum Factors 2009 Dec; 51(6):785-796
NIOSHTIC No.
20036766
Abstract
Objective: This study investigated whether relative strength between the back and knees can differentiate and predict lifting strategy and the effects of gender, load magnitude, and knowledge of strength on the strategy. Background: Although muscular strength is thought to play a vital role in the mechanics of lifting, how localized joint strengths and their relations influence lifting strategy remains unclear. Method: Thirty-two participants (16 men and 16 women) underwent isokinetic strength tests and were then divided into two groups: one provided with the knowledge of their strength test results and the other not. They subsequently performed the same set of simulated lifting tasks while their lifting kinematics were being recorded. Postural indices to quantify the lifting strategies were derived from the kinematic data. Results: The ratio of back strength versus total knee strength and gender had significant effects on measures quantifying the lifting strategy. A statistical model incorporating gender, strength, and anthropometry achieved an R 2 value of .64 and predicted correctly 76% of lifting strategies used by individual participants. Conclusion: Individuals with back strength greater than their total knee strength tended to use a back-preferred lift strategy, and vice versa, suggesting that muscular strength is a determining factor of lifting strategy. Application: An emphasis on additional knee strengthening in a training program may change the tendency of using and overstressing the back. Application of modeling and simulation technology for ergonomics design can be enhanced by more individually and accurately specified lifting strategies based on anthropometry and strength profiles.
Keywords
Biomechanical-modeling; Biomechanics; Ergonomics; Humans; Injury-prevention; Muscle-physiology; Musculoskeletal-system; Physical-capacity; Physical-stress; Physiological-factors; Physiological-function; Posture; Statistical-analysis; Worker-motivation; Work-performance; Manual-materials-handling; Author Keywords: isokinetic strength; back strength; total knee strength; manual materials handling; lifting strategy; knowledge feedback; gender differences; postural index; interventions; models and measures; biomechanics; anthropometry; work physiology
Contact
Xudong Zhang, 3820 S. Water Street, Pittsburgh, PA 15203
CODEN
HUFAA6
Publication Date
20091201
Document Type
Journal Article
Email Address
xuz9@pitt.edu
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-007838
Issue of Publication
6
ISSN
0018-7208
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Human Factors
State
IL; PA
Performing Organization
University of Illinois Urbana-Champaign
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