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Alternatives to lifting concrete masonry blocks onto rebar: biomechanical and perceptual evaluations.

Authors
Hess-JA; Mizner-RL; Kincl-L; Anton-D
Source
Ergonomics 2012 Oct; 55(10):1229-1242
NIOSHTIC No.
20042307
Abstract
This study examined the use of and barriers to H-block and high lift grouting, two alternatives to lifting concrete masonry blocks onto vertical rebar. Peak and cumulative shoulder motions were evaluated, as well as adoption barriers: H-block cost and stakeholder perceptions. Results indicated that using the alternatives significantly decreased peak shoulder flexion (p < 0.001). A case study indicated that building cost was higher with H-block, but the difference was less than 2% of the total cost. Contractors and specifiers reported important differences in perceptions, work norms, and material use and practices. For example, 48% of specifiers reported that use of high lift grouting was the contractor's choice, while 28% of contractors thought it must be specified. Use of H-block or high-lift grouting should be considered as methods to reduce awkward upper extremity postures. Cost and stakeholders' other perceptions present barriers that are important considerations when developing diffusion strategies for these alternatives. PRACTITIONER SUMMARY: This study provides information from several perspectives about ergonomic controls for a high risk bricklaying task, which will benefit occupational safety experts, health professionals and ergonomists. It adds to the understanding of shoulder stresses, material cost and stakeholder perceptions that will contribute to developing effective diffusion strategies.
Keywords
Biomechanics; Masons; Musculoskeletal-system; Musculoskeletal-system-disorders; Muscles; Muscle-function; Muscle-stress; Muscle-tension; Ergonomics; Diffusion-analysis; Analytical-processes; Humans; Men; Age-groups; Epidemiology; Statistical-analysis; Posture; Physiology; Physiological-factors; Physiological-effects; Physiological-function; Etiology; Author Keywords: ergonomics; bricklaying; shoulder injury; stakeholder perceptions; biomechanics; diffusion of innovation
CODEN
ERGOAX
Publication Date
20121001
Document Type
Journal Article
Email Address
jhess@uoregion.edu
Funding Type
Cooperative Agreement; Construction
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U54-OH-008307
Issue of Publication
10
ISSN
0014-0139
Priority Area
Construction
Source Name
Ergonomics
State
OR; MT; WA; MD
Performing Organization
CPWR-The Center for Construction Research and Training, Silver Spring, Maryland
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