Title: Resting end-tidal CO2 and negative affectivity
Authors: Van Diest, Ilse ×
Vuerstaek, Sofie
Corne, Inge
De Peuter, Steven
Devriese, Stephan
Van de Woestijne, Karel P.
Van den Bergh, Omer #
Issue Date: 2003
Publisher: Lippincott Williams & Wilkins
Series Title: Psychosomatic Medicine vol:65 issue:6 pages:976-983
Abstract: OBJECTIVE: Dhokalia, Parsons, and Anderson (Psychosom Med 1998;60:33-37) found a positive correlation between a trait measure of negative affectivity (NA; neuroticism) and resting end-tidal fractional concentration of CO2 (FetCO2) (fractional-concentration of end-tidal carbon dioxide) in a nonclinical sample. This contrasts sharply with studies reporting a negative association of FetCO2 with state measures of NA and with studies reporting no or a negative relationship between FetCO2 and trait NA. In two studies we aimed to clarify this paradox. MATERIALS AND METHODS: In the first study, 110 participants (83 women) completed the PANAS and a Checklist for Psychosomatic Symptoms in daily life. FetCO2 was measured noninvasively during 5 minutes via a nose cannula connected to a capnograph. In the second study, FetCO2 of high (N= 20, 10 men) and low (N= 20, 10 men) NA participants was sampled once with a nasal cannula and once while breathing through a mouthpiece for 6 minutes each during rest, completion of the NEO-PI-R questionnaire, and completion of a verbal knowledge test. RESULTS: The first study found no association between trait NA and resting FetCO2 after partialling out the effects of gender, menstrual phase, and use of oral contraceptives. The second study showed that FetCO2 increased significantly in the high NA group only when the particpants filled out the questionnaires, regardless of its type. CONCLUSIONS: Overall, no association between dispositional NA and cross-situational FetCO2 was observed. Apparently inconsistent findings may be caused by lack of control for hormonal status and mental load during testing.
ISSN: 0033-3174
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Health Psychology
Faculty of Medicine - miscellaneous
× corresponding author
# (joint) last author

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