Influence of posture variation on maximal acceptable work pace in a repetitive manual task
2016 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126Article in journal (Refereed) Submitted
We investigated the effect of upper arm posture variation in a repetitive pick-and-place task on maximal acceptable work pace (MAWP), muscle activity, heart rate and perceived exertion. Thirteen healthy subjects performed the task in three experimental conditions with an average upper arm elevation of 30° where the hand was moved either horizontal (H30/30), diagonal (D20/40), or vertical (V10/50). In a fourth condition, the hand was moved horizontally at 50° average arm elevation (H50/50). As intended, posture variation differed between H30/30, D20/40, and V10/50, but MAWP (10.7 cycles/min; determined in a psychophysical approach), average upper trapezius activity (54% RVE), and heart rate (69 bpm) did not. In H50/50, MAWP was lower (9.3 cycles/min), while trapezius activity (78% RVE) and perceived exertion tended to be higher. Our results indicate that biomechanical variation to the extent obtained in the current experiment leads to less effects on MAWP than a change in working height.
Place, publisher, year, edition, pages
maximal acceptable work pace; exposure variation; arm elevation; repetitive work; muscle activity
Environmental Health and Occupational Health
IdentifiersURN: urn:nbn:se:hig:diva-21295OAI: oai:DiVA.org:hig-21295DiVA: diva2:909089