Abstract:
This reseach was a quasi-experimental study designed for one sampling group.The experimental reseach was repeated before-after measured. The aims to compared hand and arm vibration acceleration, hand grip strength, hand and arm symptoms on before-after use insulated handle and satisfaction study. Research instrument were hand and arm vibration meter (accelerometer), hand grip dynamometer, Nordic musculoskelelal questionnaire and satisfaction questionnaire. Design had insulated handle for reduced vibration acceletion include anti-vibration rubber and nitrile rubber. Those meterials broungth to wrap on handle of tamping rammer machines. The data collection among tamping rammer operators for soil levering work in ten samples of three construction industry in rayong. The data analysis with Wilcoxon Signed-Ranks Test by SPSS program. The results showed that compared vibration acceleration before experimental was 7.153 m/ s 2 and after was 6.509 m/ s 2 . The vibration acceleration was statistically significantly different 0.05 (p-value < 0.005). The compared grip strength was statistically significantly different 0.05 (p-value < 0.002). The compared hand and arm symptoms was statistically significantly different 0.05 (p-value < 0.006) and had high satisfaction when used the insulated handle to reduce ,the average scale was 4.00. Such as the use insulation handle to reduce hand and arm vibration the effectiveness of acceleration vibration reduction but exposure that the direct receiving the vibration from tamping rammer. In parts of muscle strength test the results revealed that higher grip strength and satisfaction with insulation handle to reduce hand and arm vibration at a high level.