Circadian and ultradian rhythms: Clinical implications

Area of Science:

• Endocrinology
• Neuroscience
• Chronobiology

Background:

• The hypothalamic-pituitary-adrenal (HPA) axis operates with complex circadian and ultradian rhythms.
• These oscillations are vital for maintaining homeostasis and responding to environmental changes.
• Glucocorticoids (GCs) play a critical role in regulating brain and liver functions, including synaptic plasticity, memory, appetite, and metabolism.

Purpose of the Study:

• To review the significance of GC oscillations in physiological regulation.
• To highlight the impact of abnormal GC patterns on mood, appetite, and metabolism.
• To introduce advancements in measuring 24-hour cortisol profiles for improved patient care.

Main Methods:

• Review of existing literature on HPA axis dynamics and GC hormone functions.
• Discussion of the implications of GC therapy on metabolic and mood regulation.
• Introduction of novel wearable technologies for continuous 24-hour cortisol monitoring.

Main Results:

• GC oscillations are fundamental for GC-dependent gene activation in the brain and liver.
• Disruptions in GC patterns are linked to mood, appetite, and metabolic dysregulation.
• Wearable technology facilitates the measurement of 24-hour cortisol profiles, including during sleep.

Conclusions:

• Understanding cortisol rhythms is essential for endocrinologists and the pharmaceutical industry.
• Improved diagnostics and personalized hormone replacement therapy are achievable with new monitoring techniques.
• Defining physiological normality through continuous monitoring will enhance patient treatment strategies.