Citation

Gregory DE, Narula S, Howarth SJ, Russell C, Callaghan JP. Ergonomics 2008; 51(7): 1032-1041.

Affiliation

Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada.

Copyright

(Copyright © 2008, Informa - Taylor and Francis Group)

DOI

10.1080/00140130701813178

PMID

18568962

Abstract

The purpose of this study was to determine the effect of a fatiguing task (3 min intense stair climbing) on the adopted spinal postures and trunk muscular activation patterns during three highly physically demanding simulated firefighting tasks. Following the fatigue protocol, it was observed that individuals adopted significantly greater spinal flexion (16.3 degrees maximum prior to fatigue as compared to 20.1 degrees post fatigue) and displayed reduced abdominal muscle activation as compared to before the fatigue protocol (mean ranging from 16.6% maximum voluntary contraction (MVC) to 30.6% MVC prior to fatigue as compared to ranging from 14.6% MVC to 25.2% MVC post fatigue). The reduced abdominal activation may be due to a reduction in co-contraction during these tasks, which may compromise spinal stability. Reduced co-contraction combined with the increased spinal flexion may increase the risk of sustaining an injury to the low back.

Language: en