The correlation of NIRS （near-infrared spectroscopy） and EEG （electro-cortical activity） in exercise studies has never been shown. Eight sport students performed an incremental bicycle exercise test under normoxic...The correlation of NIRS （near-infrared spectroscopy） and EEG （electro-cortical activity） in exercise studies has never been shown. Eight sport students performed an incremental bicycle exercise test under normoxic and hypoxic （12.7% 02） conditions respectively. EEG and NIRS recordings of the prefrontal cortex （PFC, Brodmarm area 10.46） were performed synchronously to shed light on their correlation. ANOVA revealed a higher absolute workload （231.3 ＋ 37.2 W）, and relative PFC oxygenation under normoxic conditions, whereas hypoxic conditions resulted in earlier exhaustion （200 ~ 26.7 W） and reduced PFC oxygenation. NIRS parameters increased remarkably with exercise intensity （P 〈 0.001） and differed between conditions （O2Hb： P 〈 0.001; HHb： P = 0.023; tHb： P = 0.016） and hemispheres （O2Hb： P = 0.023）. For EEG, higher prefrontal cortical current density during compared to pre and post exercise was revealed for both conditions （P 〈 0.001）. No difference between conditions and hemispheres were found. In conclusion, brain cortical activity is not impaired by hypoxia. No correlation between NIRS and EEG, but a moderate correlation between EEG and cardio-vascular parameters and a moderate to high correlation between NIRS and cardio-vascular parameters were found. The results emphasize that the transfer of EEG and NIRS results need to be done with caution.展开更多
文摘The correlation of NIRS （near-infrared spectroscopy） and EEG （electro-cortical activity） in exercise studies has never been shown. Eight sport students performed an incremental bicycle exercise test under normoxic and hypoxic （12.7% 02） conditions respectively. EEG and NIRS recordings of the prefrontal cortex （PFC, Brodmarm area 10.46） were performed synchronously to shed light on their correlation. ANOVA revealed a higher absolute workload （231.3 ＋ 37.2 W）, and relative PFC oxygenation under normoxic conditions, whereas hypoxic conditions resulted in earlier exhaustion （200 ~ 26.7 W） and reduced PFC oxygenation. NIRS parameters increased remarkably with exercise intensity （P 〈 0.001） and differed between conditions （O2Hb： P 〈 0.001; HHb： P = 0.023; tHb： P = 0.016） and hemispheres （O2Hb： P = 0.023）. For EEG, higher prefrontal cortical current density during compared to pre and post exercise was revealed for both conditions （P 〈 0.001）. No difference between conditions and hemispheres were found. In conclusion, brain cortical activity is not impaired by hypoxia. No correlation between NIRS and EEG, but a moderate correlation between EEG and cardio-vascular parameters and a moderate to high correlation between NIRS and cardio-vascular parameters were found. The results emphasize that the transfer of EEG and NIRS results need to be done with caution.
