WFRF:(Rose Linda 1963 )
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Endurance and fatigue in eye-level work with low loads
-
- Rose, Linda, 1963- (författare)
- KTH,Skolan för industriell teknik och management (ITM),Ergonomi,Dept. of Human Factors Engineering, Chalmers University of Technology, Göteborg, Sweden
- (creator_code:org_t)
- 2001
- 2001
- Engelska.
- Ingår i: Advances in Occupational Ergonomics and Safety - 4. ; , s. 377-384
- Konferensbidrag (refereegranskat)
Abstract
Ämnesord
Stäng
- The aim of this study was to investigate fatigue reactions in eye-level work with low loads. It consisted of two parts, each with eight men participating. A handle, placed at eye-level 0.5 m in front of the body, was pushed at three different loading levels, varying between 1 and 20 % of maximum voluntary contraction (MVC). Sustained contractions were performed a) until exhaustion at endurance time Tend during registra-tion of subjective ratings of discomfort/pain and resumption time Tres, and b) for two minutes during registration of mean power frequency, MPF, of the myoelectric signals (EMG) from the biceps brachii (BB), triceps brachii (TB), trapezius (TZ) and deltoideus (DD) muscles and subjective ratings of discomfort/pain. These parameters were also studied during the following recovery period.The higher the load, the shorter were the Tend and the following recovery period. Also, the Tres decreased with increasing load. The MPF increased in some cases and de-creased in others during the sustained contractions. The levels of decrease/increase in MPF differed for the different loading levels and the different muscles. The largest fa-tigue indications in MPF were in BB while the discomfort/pain originated from TB. TZ showed the smallest fatigue reactions.The results indicate that caution should be taken when developing and using models for estimating physical strain and fatigue based on EMG indications in low loading situations.
Nyckelord
- Fatigue reactions
- EMG
- endurance time
- low external loads
- work at eye-level
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