22 September 2014 (Monday) - Cortisol Levels

When I was a lad cortisol samples were only tested if the sample was collected at 9am because of the diurnal variation of the hormone. These days they are tested on samples collected at any time *but* the time of the sample is a "must-have" because of the known and calculable diurnal variation of the hormone.
This made me think. What about shift workers? Is the hormone level related to activity, sleep patterns or to daylight?

I found this article about cortisol leels in astronauts.
http://www.ncbi.nlm.nih.gov/pubmed/7562371
It would seem that cortisol levels are related to light, not diurnal rhythms. Question answered.

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