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Measurement of trunk muscle fatigue during dynamic lifting and lowering as recovery time changes

Title
Measurement of trunk muscle fatigue during dynamic lifting and lowering as recovery time changes
Author
김정룡
Keywords
lifting/lowering; trunk muscle; fatigue; recovery time; EMG
Issue Date
2007-06
Publisher
ELSEVIER SCIENCE BV
Citation
INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS, v. 37, No. 6, Page. 545-551
Abstract
The purpose of this study was to identify the relationship between the cumulative fatigue of trunk muscles and the recovery time during dynamic lifting and lowering in symmetric and asymmetric postures. Ten subjects participated in the experiment. Recovery times of 1. 2. 3. 4. or 5 min were applied, respectively, during a 9 min period of lifting and lowering. The lifting weight was set equal to 25% of the individual's maximum voluntary condition (MVC); a lifting frequency of 4 lifts/min was used. Electromyography (EMG) signals from 10 trunk muscles were collected and analyzed in terms of mean power frequency (NIPF) before and after the lifting/lowering tasks. Fatigue level was analyzed by using analysis of variance (ANOVA). As a result, a partial recovery was observed from 3 min recovery time during symmetric lifting. In 4 min, 70% of subjects experienced a recovery of at least two trunk muscles in symmetric lifting and 10% in asymmetric lifting. In 5 min recovery time, 90% of the subjects showed a recovery of at least two trunk muscles in symmetric lifting, and 50% in asymmetric lifting. It should be noted that not all subjects were recovered in 5 min. In conclusion, proper work/rest ratios based upon the level of individual muscle fatigue may be used as an early intervention to prevent muscle fatigue in the workplace. In addition, designing an ergonomic workplace would require incorporating data from this study with other factors.
URI
https://www.sciencedirect.com/science/article/pii/S016981410700056Xhttp://repository.hanyang.ac.kr/handle/20.500.11754/106502
ISSN
0169-8141; 1872-8219
DOI
10.1016/j.ergon.2007.03.006
Appears in Collections:
COLLEGE OF COMPUTING[E] > MEDIA, CULTURE, AND DESIGN TECHNOLOGY(ICT융합학부) > Articles
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