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The effect of a lower extremity kinematic constraint on lifting biomechanics.

Authors
Jin-S; Mirka-GA
Source
Appl Ergon 2011 Nov; 42(6):867-872
NIOSHTIC No.
20040118
Abstract
Leaning against a stationary barrier during manual materials handling tasks is observed in many industrial environments, but the effects of this kinematic constraint on low back mechanics are unknown. Thirteen participants performed two-handed lifting tasks using both a leaning posture and no leaning posture while trunk kinematics, muscle activity and ground reaction force were monitored. Results revealed that lifting with the leaning posture required significantly less activity in erector spinae (26% vs. 36% MVC) and latissimus dorsi (8% vs. 14% MVC), and less passive tissue moment compared with the no leaning posture. Peak sagittal accelerations were lower when leaning, but the leaning posture also had significantly higher slip potential as measured by required coefficient of friction (0.05 vs. 0.36). The results suggested that the leaning lifting strategy provides reduced low back stress, but does so at the cost of increased slip potential.
Keywords
Humans; Men; Women; Physical-reactions; Materials-handling; Manual-materials-handling; Back-injuries; Physiological-effects; Physiological-factors; Physiological-function; Physiological-response; Physiology; Muscle-function; Muscle-physiology; Muscles; Musculoskeletal-system; Posture; Skeletal-system; Biomechanics; Body-mechanics; Body-distribution; Author Keywords: Manual materials handling; Kinematic constraints; Low back
Contact
Sangeun Jin, 3004 Black Engineering BLDG, Iowa State University, Ames, IA, 50011
CODEN
AERGBW
Publication Date
20111101
Document Type
Journal Article
Email Address
sjin@iastate.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008249; B01182012
Issue of Publication
6
ISSN
0003-6870
Source Name
Applied Ergonomics
State
IA
Performing Organization
Iowa State University
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