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Related Experiment Videos

The cortisol awakening response - normal values and confounds.

Stefan Wüst1, Jutta Wolf, Dirk H. Hellhammer

  • 1Center for Psychobiological and Psychosomatic Research, University of Trier, Dietrichstrasse 10-11, 54290 Trier, Germany,

Noise & Health
|April 12, 2003
PubMed
Summary

The cortisol awakening response is a reliable indicator of hypothalamus-pituitary-adrenal (HPA) axis activity, unaffected by most common factors. This non-invasive test provides normal values for assessing endocrine changes, particularly in response to environmental noise.

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Psychoneuroendocrinology

Background:

  • The free cortisol awakening response (CAR) is a key indicator of hypothalamus-pituitary-adrenal (HPA) axis activity.
  • Subtle HPA axis changes are linked to stress, pain, burnout, and potentially allostatic load from environmental noise.

Purpose of the Study:

  • To establish reliable normal values for the CAR by combining data from four studies.
  • To investigate factors influencing the CAR, including gender, age, and lifestyle.

Main Methods:

  • Analysis of data from 509 adult subjects across four separate studies.
  • Measurement of free cortisol levels with strict adherence to awakening time.
  • Statistical analysis to determine mean response, stability, consistency, and influencing factors.

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Main Results:

  • A mean cortisol increase of approximately 50% within 30 minutes post-awakening was observed.
  • High intraindividual stability (r=.63) and consistency (75% responders) of the CAR were confirmed.
  • Gender significantly impacted early morning cortisol levels, with women showing a delayed decrease; age, smoking, and sleep factors had minimal influence.

Conclusions:

  • The CAR is a stable and consistent endocrine marker, useful across various clinical and field settings.
  • Established normal values and identified key influencing factors (gender) facilitate research on HPA axis function.
  • The CAR's non-invasive nature makes it ideal for studying endocrine consequences of prolonged environmental noise exposure.