Abstract
The effects of manual materials handling (MMH) task conditions on the activity and fatigue of the trunk musculature were investigated. Electromyographic (EMG) signals from eight major trunk muscles were analyzed during 120 minutes of repetitive dynamic lifting tasks. Two independent task variables were the work strategy of weight and lifting frequency combination and the body posture. The dependent variables were the amplitude of EMG and the amount of median power frequency (MPF) decrease over time for the eight trunk muscles. The decreasing trends of MPF were found in some activated muscles, and they were more pronounced for the asymmetric posture than for the symmetric posture. It was also seen that muscles became fatigued faster for light load-high frequency conditions than for heavy load-low frequency conditions.
Original language | English |
---|---|
Pages (from-to) | 649-653 |
Number of pages | 5 |
Journal | Proceedings of the Human Factors and Ergonomics Society |
Volume | 1 |
State | Published - 1994 |
Externally published | Yes |
Event | Proceedings of the 38th Annual Meeting of the Human Factors and Ergonomics Society. Part 2 (of 2) - Nashville, TN, USA Duration: Oct 24 1994 → Oct 28 1994 |