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Psychosomatic Medicine, Vol 60, Issue 1 33-37, Copyright © 1998 by American Psychosomatic Society

ORIGINAL ARTICLES

Resting end-tidal CO2 association with age, gender, and personality

A Dhokalia, DJ Parsons and DE Anderson
Behavioral Hypertension Section, National Institute on Aging, Baltimore, Maryland, USA.

OBJECTIVES: A previous study found that individuals with blood pressure sensitivity to high sodium intake tend to have a high resting partial pressure of end-tidal CO2 (PetCO2). The present study analyzed the test-retest reliability of individual PetCO2 over 6 months, and the association of individual PetCO2 with age, gender, and personality characteristics. METHODS: PetCO2 of 104 men and women (mean ages 42.1+/-1.5 years) was monitored via a respiratory gas monitor for 25 minutes during each of three sessions over an 11-day interval, and 59 subjects also participated in a 25-minute follow-up session 261+/-10 days later. Each subject completed the NEO Personality Inventory. RESULTS: PetCO2 remained stable within and between monitoring sessions over a 6-month period. PetCO2 was higher in men than in women, and decreased progressively over the life span. PetCO2 was not correlated with the Extraversion, Openness, Agreeableness, or Conscientiousness Scales of the NEO Personality Inventory, but was highly positively associated with the Neuroticism Scale of the NEO Personality Inventory, and with its subscales. CONCLUSIONS: High resting end-tidal CO2 tends to be a stable individual characteristic that is accompanied by a tendency to worry and experience negative emotions.


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