This study Guelen, I., et al. (2008). "Validation of brachial artery pressure reconstruction from finger arterial pressure." J Hypertens 26(7): 1321-1327. showed tha the return-to-flow calibration with the arm cuff should be avoided in the sitting position. Yet, the Finometer user's guide recommends to perform it without making any distinction depending on body position. Also the FMS support recommended me to perform this calibration by saying

"The use of the return to flow calibration will improve the accuracy of your data, the RTF calibration is used to correct any deviations caused by the way the fingercuff is applied. I would always advise to use this function."

I am confused and I do not know if I should perform the RTF calibration in my current study with young healthy participants! I do not want to add something that might increase the measurement error rather than reduce it.

Can anyone help?

Patrick