I am wondering whether it is preferred to assess salivary DHEA or DHEA-S or both in research on the response to psychosocial stressors such as public speaking. Thus, I am interested in reactivity not on tonic levels. Do they provide different pieces of information about stress reactivity? Are there maybe practical considerations to prefer one over the other?
Some studies talk about the 2 like they were virtually the same but I have found a couple of studies suggesting that DHEA and DHEA-S do not (always?) behave identically: DHEA was correlated with cortisol whereas DHEA-S was not at all.
Any insights or reading suggestions are welcome!
Patrick