Frontal Cerebral Oxygenation in Humans at Rest: A Mirror Symmetry in the Correlation with Cardiorespiratory Activity.

Scholkmann, Felix; Zohdi, Hamoon; Wolf, Martin; Wolf, Ursula (2022). Frontal Cerebral Oxygenation in Humans at Rest: A Mirror Symmetry in the Correlation with Cardiorespiratory Activity. In: Oxygen Transport to Tissue XLIII. Advances in Experimental Medicine and Biology: Vol. 1395 (pp. 45-51). New York: Springer 10.1007/978-3-031-14190-4_8

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Although several studies published reference values for frontal cerebral tissue oxygen saturation (StO2) measured with near-infrared spectroscopy (NIRS) based cerebral oximetry, a detailed investigation, whether and which factors from systemic physiology are related to the individual StO2 values, is missing.


We investigated how the state of the cardiorespiratory system is linked to StO2 values at rest.


Absolute StO2 values (median over a 5 min resting-phase while sitting) were obtained from 126 healthy subjects (age: 24.0 ± 0.2 years, 45 males, 81 females) over the left and right prefrontal cortex (PFC) by employing frequency-domain NIRS as part of a systemic physiology augmented functional near-infrared spectroscopy (SPA-fNIRS) study. In addition, heart rate (HR) and respiration rate (RR) were measured, and the pulse respiration quotient (PRQ) was determined (PRQ = HR/RR). General additive models (GAM) were used to analyse the data.


The GAM analysis revealed a specific relationship between the overall PFC StO2 values (mean over right and left PFC) and the variables HR and RR: HR was positively correlated with mean StO2, while RR showed no correlation. In the mirror case, RR was negatively linearly correlated with the frontal cerebral oxygenation asymmetry (FCOA), which was not correlated with HR. The right PFC StO2 was not linked to the RR, whereas the left PFC StO2 was. Positive correlations of the PRQ with the mean PFC StO2 as well as the FCOA were also found. GAM modelling revealed that the individual FCOA values are explained to a large extent (deviance explained: 88.8%) by the individual mean PFC StO2 and PRQ. We conclude that (i) the state of the cardiorespiratory system is significantly correlated with StO2 values and (ii) there is a mirror symmetry with regard to the impact of cardiorespiratory parameters on the mean PFC StO2 and FCOA.

Item Type:

Book Section (Book Chapter)


04 Faculty of Medicine > Medical Education > Institute of Complementary and Integrative Medicine (IKIM)

UniBE Contributor:

Scholkmann, Felix Vishnu, Wolf, Ursula


600 Technology > 610 Medicine & health




Advances in Experimental Medicine and Biology






Pubmed Import

Date Deposited:

20 Dec 2022 13:39

Last Modified:

02 Mar 2023 23:37

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Uncontrolled Keywords:

Cardiorespiratory activity Frontal cerebral tissue oxygen saturation NIRS SPA-fNIRS




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