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• W4387369968 abstract "SignificanceCerebrovascular reactivity can be evaluated by prefrontal cortex (PFC) hemodynamic responses and oxygenation changes secondary to hypoxia using near-infrared spectroscopy (NIRS). However, whether there are hemispheric differences in these NIRS-determined PFC hemodynamic responses and oxygenation changes remains unknown.AimThis study was performed to determine whether there are differences in the PFC hemodynamic responses and oxygenation changes secondary to hypoxia between the left and right frontal poles (FPL and FPR, respectively).ApproachFifteen young men participated in the study. During conduction of an isocapnic hypoxia protocol with a 10-min hypoxic phase at partial pressure of end-tidal oxygen (PETO2) of 45 Torr, hemodynamic and oxygenation indices comprising oxygenated hemoglobin (oxy-Hb), deoxygenated Hb (deoxy-Hb), total Hb (total-Hb), and tissue oxygen saturation (StO2) over FPL and FPR were measured by NIRS. The heart rate (HR) was evaluated by electrocardiography.ResultsIn response to hypoxia, the HR increased, oxy-Hb decreased, deoxy-Hb increased, total-Hb increased above baseline, and StO2 decreased. There was no difference in the change in total-Hb between FPL and FPR. However, there were greater changes in oxy-Hb, deoxy-Hb, and StO2 over FPL than over FPR, indicating that PFC oxygenation asymmetry occurs in response to hypoxia. Moreover, the change in total-Hb over FPL was associated with the increase in HR.ConclusionsNIRS-determined hemodynamic responses and oxygenation changes secondary to hypoxia might not simply reflect the direct effect of hypoxia on cerebral vessels. Although there is no hemispheric difference in the PFC hemodynamic responses to hypoxia as in total-Hb, PFC oxygenation asymmetry occurs in young adults." @default.
• W4387369968 created "2023-10-06" @default.
• W4387369968 creator A5050080988 @default.
• W4387369968 date "2023-10-05" @default.
• W4387369968 modified "2023-10-11" @default.
• W4387369968 title "Acute hypoxia elicits prefrontal oxygenation asymmetry in young adults" @default.
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• W4387369968 doi "https://doi.org/10.1117/1.nph.10.4.045002" @default.
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• W4387369968 hasPublicationYear "2023" @default.
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