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The results suggest that HAVS is under-diagnosed in Malaysia, especially in the agricultural sectors. More information related to safety and health awareness programmes for HAVS exposure is required among hand-held grass-cutting workers.

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Abstract.A cross sectional study was conducted to evaluate whole body vibration (WBV) and back pain problem among light rail transit (LRT) driver. This study was carried out to determine exposure level of whole body vibration and identify back pain problem due to whole body vibration exposure among LRT driver. Standardized Nordic questionnaire was used for the analysis of musculoskeletal symptoms, to identify the prevalence of back pain, information about health history, working time duration, and working experiences was obtained from 52 drivers of light rail transit (LRT) train. HVM 100 Larson Davis was used to measure whole body vibration measurement of eight LRTs with different vehicle number. The measurement of whole body vibration was done during operation working time. The data collected from HVM 100 were transferred to the Blaze software for getting the vibration magnitude of the experiment while data collected from survey were analyzed by using Statistical Package for the Social Sciences (SPSS) for statistical analysis. The analysis of graph patterns and the differentiation of magnitude value from each LRT were studied to determine the exposure level of vibration. A high prevalence of back pain (82.7%) among LRT drivers was found and high daily exposure level was obtained. The finding showed that, there are relations between back pain and daily vibration exposure which resulted in a correlation coefficient of 0.709, with significant at α = 0.05. In conclusion, it was expected that the individuals subjected to the high vibration levels would tend to report back pain. Introduction.Back pain is one of the common disorders experienced by society, especially for the elderly. It is most common musculoskeletal problem among person 30 to 50 years old [1]. Back pain can occur in many occupations, for a variety of reasons. Some of the risk factors for developing back injury and pain are heavy and/or frequent lifting, static posture (usually seated), unexpected loading of the back, and whole body vibration. Professional drivers are subjected to at least two of these risk factors consistently working in long duration of time, and whole body vibration. Certainly the effects of exposure to these risk factors are felt in these occupations on an individual and industry level, as back aches and pains are considered to be a major cause of illness and sick leave among professional drivers [2]. This study was to determine exposure level of whole body vibration due to back pain problem among LRT driver.

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