Transdermal Optical Imaging (TOI) as a Non-invasive Measure to Detect Changes in Hydration Status in Healthy Adults and Athletes

Unrestricted fluid intake.

In the 24 hours between the first and last face scan, reduce fluid intake by approximately 75% (equating to approximately 700 ml (women) and 800 ml (men)).

No restriction on fluid intake

Not permitted to drink during training session.