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Titolo:
Fatigue and endurance limits during intermittent overhead work
Autore:
Nussbaum, MA; Clark, LL; Lanza, MA; Rice, KM;
Indirizzi:
Virginia Polytech Inst & State Univ, Ind & Syst Engn, Blacksburg, VA 24061USA Virginia Polytech Inst & State Univ Blacksburg VA USA 24061 , VA 24061USA
Titolo Testata:
AIHAJ
fascicolo: 4, volume: 62, anno: 2001,
pagine: 446 - 456
SICI:
1529-8663(200107/08)62:4<446:FAELDI>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOCALIZED MUSCLE FATIGUE; SHOULDER-NECK REGION; INTRAMUSCULAR PRESSURE; MUSCULAR FATIGUE; DYNAMIC EXERCISE; MUSCULOSKELETAL DISORDERS; SURFACE ELECTROMYOGRAM; STATIC CONTRACTIONS; INDUSTRIAL-WORKERS; REPETITIVE WORK;
Keywords:
endurance; fatigue; gender differences; intermittent work; overhead work; perceived discomfort;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
90
Recensione:
Indirizzi per estratti:
Indirizzo: Nussbaum, MA Virginia Polytech Inst & State Univ, Ind & Syst Engn, 250 Durham Hall 0118, Blacksburg, VA 24061 USA Virginia Polytech Inst & State Univ250 Durham Hall 0118 Blacksburg VA USA 24061
Citazione:
M.A. Nussbaum et al., "Fatigue and endurance limits during intermittent overhead work", AIHAJ, 62(4), 2001, pp. 446-456

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 unsuitablefor the simulated overhead assembly efforts examined. Furthermore, such guidelines may fail to capture the substantial interindividual variability observed in this experiment.

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Documento generato il 28/01/20 alle ore 21:09:57