HPA axis activation by a socially evaluated cold-pressor test

Area of Science:

• Psychophysiology
• Neuroendocrinology
• Stress Research

Background:

• The cold-pressor test (CPT) is a common laboratory stressor activating the sympathetic nervous system.
• However, CPT elicits only moderate to low cortisol responses, indicating limited hypothalamus-pituitary-adrenal (HPA) axis reactivity.

Purpose of the Study:

• To investigate if adding social-evaluative elements enhances cortisol responses to the CPT.
• To determine if social evaluation alone or combined with a physical challenge is necessary for HPA axis activation.

Main Methods:

• 70 healthy young men underwent either a standard CPT or a socially evaluated CPT (SECPT).
• Participants immersed their hand in ice or warm water, with or without being observed and videotaped by a woman.
• Saliva cortisol levels, blood pressure, and subjective stress were measured.

Main Results:

• Both CPT and SECPT increased blood pressure and subjective stress similarly.
• Saliva cortisol elevations and the proportion of responders were significantly higher in the SECPT group compared to the standard CPT.
• Social evaluation with warm water immersion did not increase cortisol, suggesting both challenge and social evaluation are needed.

Conclusions:

• Incorporating social-evaluative elements significantly increases HPA axis responses to the CPT.
• The SECPT is a valuable tool for enhancing stressor intensity and measuring HPA axis reactivity in research settings.