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- Combined Effect of Vibration Intensity, Grip Temperature, Noise and Pushing Power on Grip Forces and Skin Temperatures of Fingers.
- Kyungsim Koh, B Griefahn, M Fritz, P Brode
- Korean J Prev Med. 1994;27(4):763-776.
- 1,911 View
- 21 Download
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Abstract
PDF - Recent studies reveal that grip forces during the hand-arm vibration are most significant for the genesis of vibration-induced white finger syndrome. Therefore, exerted grip forces and skin temperatures or fingers were regarded as dependent variables in experiments and the effects of grip temperature, noise, pushing force, vibration and the combined effect of vibration and pushing force were studied. The objectives or the present study were, first, to varify and compare the changes of grip force affected by grip temperature, noise, pushing force, vibration and the combined effect of vibration and pushing force and, second, to observe the reaction of finger skin temperature affected by above factors. Forty-six healthy male students(25.07+/-2.85) participated in five systematically permuted trials, which endured 4 minutes each other. Experiments were executed in a special chamber with an air temperature of 21 C. In each experiments, the subjects were exposed to five experiment types: (l) grip force of 25 N only, (2) pushing force of 50 N, (3) acceleration of vibration 7.1m/sec2(z-direction), (4) pink noise or 95 dB(A) and (5) combination of pushing force 50 N and acceleration of vibration 7.1m/sec2. A repeated-measures analysis of variance(ANOVA) was performed on the grip force to test whether it was affected by noise, pushing force, vibration and pushing force. The present results show that vibration was significantly related to the increase of grip force, but the other factors, such as pushing force, noise and grip temperature had no significant influence on the increase of grip force and that the reaction of finger skin temperature were significantly affected by the skin temperature at start of experiment and grip temperature, not grip force and other experimental conditions. Therefore, we suggest that the management for decreasing the grip force is meaningful to prevent the occurrence of Hand-arm vibration syndrome (HAVS).
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Summary
- A Study on Experiments the Environmental Conditions and the Adaptation of the Human Body in the Vinyl House.
- Bu Ja Shim
- Korean J Prev Med. 1994;27(1):59-73.
- 1,974 View
- 18 Download
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Abstract
PDF
- The purpose of this study is to experiments the environmental conditions and the adaption of the human body in the vinyl house. The study was done in spring and winter and experimental clothes were used working clothes in the vinyl house. The results are as follows. 1. Environmental conditions; In the spring season, the indoor air temperature was 27.4+/-3.7 degrees C and the outdoor air temperature was 14.4+/-2.7 degrees C. In the winter season, the indoor air temperature was 18.3+/-4.8 degrees C and the outdoor air temperature was 7.6+/-2.5 degrees C on the average. 2. Skin Temperature; In the spring season, the mean skin temperatures indoor and outdoor were 33.81+/-0.7 degrees C and 31.57+/-0.8 degrees C respectively, a difference of 2.24 degrees C. In the winter season, they were 31.95+/-1.93 degrees C and 29.86+/-0.55 degrees C respectively, a difference of 2.09 degrees C. 3. Clothing climate; In the spring season, the temperature and humidity in the inner layer of clothing were 34.77+/-0.80 degrees C and 70.75+/-1.65% and indoor, 31.9+/-0.52 degrees C and 51.9+/-3.70% outdoor respectively. In the winter season, those were 32.52+/-1.04 degrees C and 64.65+/-3.68% indoor, 30.27+/-0.96 degrees C and 45.07+/-2.68% outdoor respectively. 4. Physiological Factors; Body temperature increased slightly and the pulse rate also rises, but blood pressure decreased a little with the rise of environmental temperature both in the spring and winter seasons. 5. Psychological Factors; Thermal sensation in the spring season was expressed as "slightly larm" or "warm" indoor and as "neutral" in the open air, while in the winter it was expressed as "neutral" or "slightly warm" outdoor the house and as "cold" in the open air. Comfort sensation was characterized as "uncomfortable" or "slightly uncomfortable" indoor both in the spring and winter seasons, but in the open air it was characterized as "comfortable" in the spring and as "slightly uncomfortable" in the winter.
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Summary
- Change of Skin Temperature of Workers Using Vibrating Tools in Anthracite Mines.
- Jaehoon Roh, Young Hahn Moon, Dongchun Shin, Bong Suk Cha, Soo Nam Cho
- Korean J Prev Med. 1988;21(2):357-364.
- 1,952 View
- 21 Download
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Abstract
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- By implementing epoch-making policies for industrial promotion, the national economy has made a remarkable development. As a result of such economic growth, industrial accidents and occupational diseases have become a serious problem in Korean society. In the presidential order for the execution of the Korean Labor Standard Law, neuritis and other diseases stemming from health impairments due to vibrations in industrial processes are designated to be dealt with as vibration diseases. In the case of vibration disease, industrial accident compensation is not effectively paid. In order to investigate the vibration hazards of rock-drill operation, the authors studied the subjective symptoms and performed physical function tests on a total of 79 persons (vibration exposed group) who used rock-drills, and 39 persons (control group) who did not use rock-drills at anthracite mines. The results of the physical function test were as follows : 1. The right hand was more affected by white finger than the left hand. 2. Independent variables such as duration of rock-drill operation, age, drinking and smoking were identified as statistically significant factors for the occurrence of white finger. 3. In the pain sense threshold, the group with Raynaud's phenomenon showed a statistically higher level than that of the control group. 4. The skin temperature of the group with Raynaud's phenomenon was lower than that of the control group. The recovery time of skin temperature after cooling was delayed compared with the value of the control group.
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Summary
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