Before revision:  Results show that the amplitude of the 0.1 Hz oscillations is higher in POTS patients and that the phase response between the two signals is faster . POTS is associated with an increase in 0.1 Hz oscillations in SBP and HR . The best disease indicator is the phase response between the two signals significant both at rest and HUT . The 0.1 Hz phase response and oscillation amplitude metrics provide new markers that can improve POTS diagnostic , eliminating the need for postural change , which often is associated with dizziness or fainting .
After revision:  Results show that the amplitude of the 0.1 Hz oscillations is higher in POTS patients and that the phase response between the two signals is faster . POTS is associated with an increase in 0.1 Hz oscillations in SBP and HR . The best disease indicator is the phase response between the two signals significant both at rest and HUT . The 0.1 Hz phase response and oscillation amplitude metrics provide new markers that can improve POTS diagnostic augmenting the existing diagnosis protocol only analyzing the change in heart rate .