108
H. J. Schmitt
Fig. 6.3 PPG left earlobe a breathing b in time low frequency spectra c and d during YOGA.
Strong 0.12 Hz rhythm in PPG signal
to redden face and ears. These are all indications of a very effective and ubiquitous
autoregulation system to adapt to different tasks and loads.
6.2 Concept of Potential Origin
The most obvious feature concerns the rather fixed frequency of the observed ”relaxation rhythm”. Any explanation would have to call for phenomena with relevant time
duration in the order of several seconds. One such phenomenon is the time delay
incurred for blood flow in the capillary system, associated with metabolic processes,
H. J. Schmitt
Fig. 6.3 PPG left earlobe a breathing b in time low frequency spectra c and d during YOGA.
Strong 0.12 Hz rhythm in PPG signal
to redden face and ears. These are all indications of a very effective and ubiquitous
autoregulation system to adapt to different tasks and loads.
6.2 Concept of Potential Origin
The most obvious feature concerns the rather fixed frequency of the observed ”relaxation rhythm”. Any explanation would have to call for phenomena with relevant time
duration in the order of several seconds. One such phenomenon is the time delay
incurred for blood flow in the capillary system, associated with metabolic processes,