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Fatigue and endurance limits during intermittent overhead work.

Authors
Nussbaum-MA; Clark-L; Kirst-M; Rice-K
Source
Am Ind Hyg Assoc J 2001 Jul/Aug; 62(4):446-456
NIOSHTIC No.
20031284
Abstract
Shoulder problems are prevalent in industrial work, particularly when tasks require the hands to be used at or above shoulder level. Although extensive research has been conducted on prolonged static exertions, and several guidelines for such efforts exist, there is insufficient information for ergonomic evaluation of tasks that are intermittent and/or dynamic. A laboratory simulation was conducted of overhead assembly work that was both intermittent and dynamic, and which varied the duty cycle (work/rest ratio), arm reach, and hand orientation of a tapping task. Results consisted of endurance times and also the times of fatigue onset as indicated by perceived discomfort and declines in muscle strength. Females exhibited longer (22%) endurance times, delayed reports of discomfort, and slower declines in strength. Significant influences of duty cycle were found on both endurance and fatigue times, yet arm reach and hand orientation did not have consistent effects. Distributions of endurance and fatigue times are presented as criteria for preliminary evaluation of overhead work. Endurance times could be predicted with only moderate accuracy from earlier indicators of fatigue onset. Existing guidelines, albeit developed for static tasks, appeared unsuitable for the simulated overhead assembly efforts examined. Furthermore, such guidelines may fail to capture the substantial interindividual variability observed in this experiment.
Keywords
Fatigue; Fatigue-properties; Ergonomics; Laboratory-testing; Simulation-methods; Endurance-tests; Demographic-characteristics; Sex-factors; Occupational-health; Muscles; Physical-properties
Contact
Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, 250 Durham Hall (0118), Blacksburg, VA, 24061
CODEN
AIHAAP
Publication Date
20010701
Document Type
Journal Article
Email Address
nussbaum@vt.edu
Funding Type
Grant
Fiscal Year
2001
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T01-OH-008613
Issue of Publication
4
ISSN
0002-8894
Source Name
American Industrial Hygiene Association Journal
State
VA
Performing Organization
Department of Industrial and Systems Engineering, Virginia Tech University, Blacksburg, Virginia
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