Document Detail

End-tidal PCO2 as an index of psychophysiological activity during VDT data-entry work and relaxation.
MedLine Citation:
PMID:  8119258     Owner:  NLM     Status:  MEDLINE    
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 psychophysiological 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: (a) during a self-relaxation baseline period; (b) during an abbreviated progressive muscle relaxation period; and (c) during a period of computer-based data-entry work. End-tidal PCO2, respiration frequency, and cardiac inter-beat interval (a measure of heart rate and its variability) were monitored continuously during the three conditions of the study. Self-ratings of relaxation and tension were also monitored at periodic intervals. Consistent with a decrease in psychophysiological arousal, end-tidal PCO2 and self-ratings of relaxation were significantly higher during progressive muscle relaxation than during baseline relaxation. Consistent with an increase in psychophysiological arousal, end-tidal PCO2, cardiac inter-beat interval, and relaxation ratings during data-entry work were significantly lower than during either baseline relaxation or progressive muscle relaxation, while respiration frequency and tension ratings were higher. The findings indicate that end-tidal PCO2 discriminates among different psychophysiological states, and that end-tidal PCO2 may be useful in indexing the stress-health effects of human-computer interactions.
L M Schleifer; R Ley
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ergonomics     Volume:  37     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1994 Feb 
Date Detail:
Created Date:  1994-04-04     Completed Date:  1994-04-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  245-54     Citation Subset:  IM; S    
Division of Biomedical and Behavioral Science, National Institute for Occupational Safety and Health, Cincinnati, OH 45226.
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MeSH Terms
Carbon Dioxide / blood*
Computer Terminals*
Monitoring, Physiologic
Relaxation / physiology*
Stress, Physiological / blood,  physiopathology,  psychology*
Task Performance and Analysis*
Tidal Volume / physiology
User-Computer Interface
Work / physiology*
Reg. No./Substance:
124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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