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Prediction of TTS for hand intermittent vibration
Y Yonekawa1, S Maeda, M Morioka
1Division of Human Engineering, National Institute of Industrial Health, Kawasaki, Japan.
Industrial Health
|May 16, 1998
Summary
This study investigated Temporary Threshold Shift (TTS) from hand-transmitted vibration. Findings suggest extending rest periods for low-level vibration tools to 10 minutes after 30 minutes of exposure.
Area of Science:
- Occupational health
- Vibration toxicology
- Human physiology
Background:
- Hand-transmitted vibration (HTV) poses risks to workers.
- Temporary Threshold Shift (TTS) is a key indicator of HTV effects.
- Understanding vibration exposure is crucial for workplace safety.
Purpose of the Study:
- To predict Temporary Threshold Shift (TTS) under intermittent vibration exposure.
- To evaluate the exposure equivalent rule for vibration.
- To examine equations for TTS growth and recovery.
Main Methods:
- Conducted experiments to measure TTS.
- Developed and validated predictive models for TTS.
- Compared experimental predictions with Japanese labor regulations.
Main Results:
- Predicted TTS showed good agreement with measured TTS.
- The study validated predictive models for vibration-induced TTS.
- Identified a need to revise current rest time recommendations.
Conclusions:
- The developed TTS prediction procedure is reliable.
- Current Japanese regulations for rest time may be insufficient.
- Extending rest periods to 10 minutes is recommended for 30-minute exposures to low-level vibration tools.