A Comparative Study on Changes in Cardiovascular Indices of Cobblestone Workers in Addis Ababa, Ethiopia

Hailemariam H. Mamo


Cobblestone projets have become good job opportunities for hundred thousands of citizens. However, workers are at risk of health problems due to physical injury and exposure to dust particles during work activities. The study was designed to determine acute and chronic changes in cardiovascular indices of cobblestone workers in Addis Ababa, Ethiopia. Comparative cross-sectional study method was applied. Cobblestone workers exposed for one and above years and proportional number of non exposed groups from Addis Ababa University summer non- smoking normal students within the same age range and sex proportion were participated. Acute exposure standard was established on an eight-hour exposure time frame. HR, %SPO2 and ABP were measured before and after a day work exposure, using pulse oxi-meter and sphygmomanometer. The study showed significant change in cardiovascular indices compared with controls. The mean value of %SPO2 was reduced significantly (p=0.03) in exposed groups compared to non exposed groups. The mean value±SD of HR in exposed groups showed very significant increment (p=0.001) and variability was reduced. Both sPB (p=0.006) and dBP (p=0.001) showed very significant increment. From this study, it could be concluded that dust emission during cobblestone work affects the cardiovascular function of cobblestone workers. Acute and chronic exposure to dust for some hours leads to very significant changes in cardiovascular indices. Regular inspection and further study is recommended together with full co-operation among the competent authority, researchers, workers and occupational health professionals.  


Cardiovascular indices; Cobblestone workers; Comparative study.

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