End-tidal PCO2 as an index of psychophysiological activitiy during VDT data-entry work and relaxation

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      <subfield code="a">End-tidal PCO2 as an index of psychophysiological activitiy during VDT data-entry work and relaxation</subfield>
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      <subfield code="a">The present study was designed to assess the utility of end-tidal PCO2 (peak concentration of carbon dioxide in a single breath of exhaled air) as an index of psycholphysiological activity during performance of a computer-based task and during relaxation. Eleven data-entry operators were monitored continuously for three consecutive, 6 hour work days under the following conditions: during a self-relaxation baseline period; during an abbreviated progressive muscle relaxation period; and during a period of computer-based data-entry work. End-tidal PCO2, respiration frequency, and cardiac inter-beat interval were monitored continuously during the three conditions of the study</subfield>
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      <subfield code="t">Ergonomics</subfield>
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      <subfield code="g">Vol. 37, nº 2, February 1994 ; p. 245-254</subfield>
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