Fearful responding to repeated CO2 inhalation: A preliminary investigation

Authors

J. Gayle Beck, University at Buffalo, The State University of New YorkFollow
Jillian C. Shipherd, University at Buffalo, The State University of New York
Barbara J. Zebb, University at Buffalo, The State University of New YorkFollow

Abstract

In an effort to explore factors which maintain fear of physical sensations, repeated administration of 35% C02 was used with college students scoring high and low on the Anxiety Sensitivity Index. Half of each group was administered 12 CO2 trials, while the other half received 9 CO2 trials, followed by a dishabituation trial (Trial 10) and 2 more CO2 administrations (Trials 11 and 12). Measures included subjective anxiety, heart rate, skin conductance, and number of panic symptoms reported. Results indicated a nonsignificant trend for the High ASI group to show increased pre-inhalation anxiety across trials, while the Low ASI group showed a rapid reduction in pre-inhalation anxiety. Post-inhalation skin conductance mirrored this pattern, although rapid reduction in post-inhalation heart rate was observed. Overall, the High ASI participants showed a notable lack of fear reduction across trials. Results are discussed in light of sensitization as a factor contributing to anticipatory anxiety, with implications for understanding the etiology and maintenance of Panic Disorder.

Publication Title

Behaviour Research and Therapy

Recommended Citation

Gayle Beck, J., Shipherd, J., & Zebb, B. (1996). Fearful responding to repeated CO2 inhalation: A preliminary investigation. Behaviour Research and Therapy, 34 (8), 609-620. https://doi.org/10.1016/0005-7967(96)00039-3