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cardiovascular load assessment of coal mine shovelers in west bengal, india: a comparison between middle age groups.cardiovascular load of underground shovelers was assessed in terms of heart rate changes at work in haulage coalmines. twenty underground shovelers of two different age groups (those of age 31-39 and those of age 40-49) served as subjects. working heart rate was significantly higher (p < 0.01) in the older group (138.2 beats/min) than in the younger group (130.4 beats/min). though the net cardiac cost did not differ significantly between the groups (64.8 beats/min and 69.4 beats/min in younger a ...200618516876
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