Cardiac frequency throughout a working shift in coal miners

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      <subfield code="a">Despite the ever-increasing mechanization of industrial activities, coal mining still remains a physically demanding occupation as it is not always possible to extensively mechanize the extraction process. To estimate the physical effort necessary to sustain coal mining activities in a poorly-mechanized mine, cardiac frecquency was measured throughout the working shift with a Sport-Tester PE3000 in a representative sample of 73 asturian miners engaged in a full spectrum of underground work</subfield>
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      <subfield code="t">Ergonomics</subfield>
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      <subfield code="g">Vol. 38, nº 6, June 1995 ; p. 1250-1263</subfield>
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