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Related Experiment Videos

Upright posture influences salivary cortisol.

J Hennig1, J Friebe, I Ryl

  • 1Institute for Psychobiology and Behavioral Medicine, University of Giessen, Germany. juergen.hennig@psychol.uni-giessen.de

Psychoneuroendocrinology
|January 14, 2000
PubMed
Summary

Body posture significantly impacts salivary cortisol levels in healthy individuals. Upright positions increase cortisol, while sitting and lying positions show normal circadian decreases, highlighting the need to control posture in research.

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Area of Science:

  • Endocrinology
  • Psychoneuroendocrinology
  • Human Physiology

Background:

  • Salivary cortisol is a key biomarker for stress and circadian rhythms.
  • Autonomic nervous system activity influences hormonal responses.
  • The effect of body posture on cortisol dynamics is not fully understood.

Purpose of the Study:

  • To investigate the influence of different body postures on salivary cortisol concentrations.
  • To examine the relationship between cardiovascular responses and cortisol changes.
  • To assess the impact of posture on emotional states.

Main Methods:

  • Balanced cross-over design with 24 healthy volunteers.
  • Exposure to sitting, lying, and upright positions for 20 minutes.
  • Measurement of blood pressure, heart rate, and salivary cortisol; emotional state questionnaires.

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Main Results:

  • Upright posture led to a significant increase in salivary cortisol, unlike sitting and lying positions.
  • Upright posture induced heart rate acceleration and reduced systolic blood pressure.
  • Positive correlations were found between systolic blood pressure changes and cortisol increases in upright and lying positions.

Conclusions:

  • Body posture significantly affects salivary cortisol concentrations, independent of emotional state.
  • Non-specific hormonal increases due to posture can interfere with state/trait dependent responses.
  • Controlling for posture is crucial in both field and experimental studies to ensure accurate hormonal measurements.