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Endurance time and physiological responses to prolonged arm lifting
S S Asfour1, M Tritar, A M Genaidy
1Department of Industrial Engineering, University of Miami, Coral Gables, FL 33124.
Ergonomics
|March 1, 1991
Summary
Prolonged arm lifting tasks reduce endurance time as load and frequency increase. Physiological responses like oxygen consumption and heart rate during arm work are generally lower than during leg lifting tasks.
Area of Science:
- Ergonomics
- Occupational Physiology
- Biomechanics
Background:
- Prolonged arm lifting tasks are common in various occupations.
- Understanding the physiological strain is crucial for preventing injuries and optimizing work capacity.
Purpose of the Study:
- To investigate the impact of prolonged arm lifting on endurance and physiological responses.
- To analyze the effects of load frequency and weight on these parameters.
Main Methods:
- Ten male college students performed prolonged arm lifting tasks.
- Independent variables included handling frequency and load weight.
- Dependent variables measured: endurance time, oxygen consumption, minute ventilation, heart rate, and perceived exertion.
Main Results:
- Endurance time decreased significantly with increased frequency or load.
- Oxygen consumption and heart rate limits showed an interaction effect between frequency and load.
- Physiological limits for arm lifting were generally lower compared to leg lifting tasks.
- No significant difference in average physiological responses between short and long durations for arm work.
Conclusions:
- Increased load and frequency negatively impact arm lifting endurance.
- Physiological responses during arm lifting are sensitive to load and frequency interactions.
- Arm lifting tasks impose different physiological demands compared to leg lifting.