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The Cumulative Trunk Muscle Fatigue Depending on The Length of Recovery Time  

Shin, Hyun-Joo (Ergomechanics Lab, Department of Industrial Engineering, Hanyang University)
Kim, Jung-Yong (Ergomechanics Lab, Department of Industrial Engineering, Hanyang University)
Publication Information
Journal of Korean Institute of Industrial Engineers / v.33, no.1, 2007 , pp. 44-51 More about this Journal
Abstract
The purpose of this study was to identify the relationship between the cumulative fatigue of trunk muscles andthe period of recovery time during repetitive lifting and lowering tasks with symmetric and asymmetric postures.Ten subjects participated in the experiment. Subjects had 1, 2, 3, 4 and 5 minutes recovery time respectivelywhile they were performing the lifting and lowering task repeatedly for 3 minutes with the weight equivalent to25% level of MVC. EMG signals from ten trunk muscles were collected and the fatigue level was analyzedquantitatively. In results, the local muscle fatigue was no longer accumulated when 5 minutes recovery time wasgiven in symmetric position. For asymmetric position, it took longer minutes to prevent the fatigue accumul-ation. Different trunk muscles indicated slightly different recovery patterns in terms of MPF (Mean Powerfrequency) value.This result would help ergonomist design the length of recovery time to control the cumulative fatigue of trunkmuscles in industry with repetitive lifting and lowering task.
Keywords
Lifting/Lowering; Muscle Fatigue; Recovery Time; EMG;
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