Measuring Urinary 6-Sulphatoxymelatonin in Humans

Area of Science:

• Chronobiology
• Endocrinology
• Sleep Science

Background:

• The pineal melatonin rhythm is a key indicator of the human circadian system's timing.
• Plasma melatonin measurements are correlated with its urinary metabolite, 6-sulphatoxymelatonin (aMT6s).
• Urinary aMT6s provides a noninvasive method for assessing circadian phase, especially in field studies.

Purpose of the Study:

• To detail the protocol for collecting urinary aMT6s samples.
• To describe the method for calculating acrophase (peak time) of urinary aMT6s.
• To establish urinary aMT6s acrophase as a reliable circadian phase marker.

Main Methods:

• Collection of timed urine samples for aMT6s analysis.
• Quantification of 6-sulphatoxymelatonin (aMT6s) levels.
• Calculation of the acrophase (peak time) from the aMT6s rhythm data.

Main Results:

• The study outlines a validated protocol for urinary aMT6s collection.
• A method for calculating the aMT6s acrophase is presented.
• The aMT6s acrophase demonstrates a strong correlation with established circadian timing markers.

Conclusions:

• Urinary aMT6s is a practical and noninvasive biomarker for human circadian phase assessment.
• The described protocol and acrophase calculation method facilitate accurate circadian timing measurements.
• This approach is particularly valuable for field research and large-scale studies on circadian rhythms.