Title
The effects of horizontal load speed and lifting frequency on lifting technique and biomechanics
Campus Units
Industrial and Manufacturing Systems Engineering
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
2010
Journal or Book Title
Ergonomics
Volume
53
Issue
8
First Page
1024
Last Page
1032
Research Focus Area(s)
Ergonomics and Human Factors
DOI
10.1080/00140139.2010.493957
Abstract
Lifting loads that have a horizontal velocity (e.g. lifting from a conveyor) is often seen in industry and it was hypothesised that the inertial characteristics of these loads may influence lifting technique and low back stress. Seventeen male participants were asked to perform lifting tasks under conditions of four horizontal load speeds (0 m/s, 0.7 m/s, 1.3 m/s and 2.4 m/s) and two lifting frequencies (10 and 20 lifts/min) while trunk motions and trunk muscle activation levels were monitored. Results revealed that increasing horizontal load speed from 0 m/s to 2.4 m/s resulted in an increase in peak sagittal angle (73° vs. 81°) but lower levels of peak sagittal plane angular acceleration (480°/s2 vs. 4°/s2) and peak transverse plane angular acceleration (200°/s per s vs. 140°/s per s) and a consistent increase in trunk muscle co-activation. Participants used the inertia of the load to reduce the peak dynamics of the lifting motion at a cost of increased trunk flexion and higher muscle activity.
Copyright Owner
Taylor & Francis
Copyright Date
2010
Language
en
File Format
application/pdf
Recommended Citation
Dai, Boyi; Jin, Sangeun; Ning, Xiaopeng; and Mirka, Gary, "The effects of horizontal load speed and lifting frequency on lifting technique and biomechanics" (2010). Industrial and Manufacturing Systems Engineering Publications. 153.
https://lib.dr.iastate.edu/imse_pubs/153
Comments
This is a manuscript of an article published as Dai 1, Boyi, Sangeun Jin 1, Xiaopeng Ning, and Gary A. Mirka. "The effects of horizontal load speed and lifting frequency on lifting technique and biomechanics." Ergonomics 53, no. 8 (2010): 1024-1032. doi:10.1080/00140139.2010.493957. Posted with permission.