Electrocortical and Hemodynamic Changes within the Brain during Incremental Bicycle Exercise in Normoxia and Hypoxia—A Combined EEG/NIRS Study

Vera Abeln; Stefan Schneider; Axel Knicker; Thorsten Schiffer; Wildor Hollmann; Heiko Klaus Struder

doi:10.17265/2332-7839/2015.03.001

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Electrocortical and Hemodynamic Changes within the Brain during Incremental Bicycle Exercise in Normoxia and Hypoxia—A Combined EEG/NIRS Study

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Electrocortical and Hemodynamic Changes within the Brain during Incremental Bicycle Exercise in Normoxia and Hypoxia—A Combined EEG/NIRS Study

Vera Abeln, Stefan Schneider, Axel Knicker, Thorsten Schiffer, Wildor Hollmann and Heiko Klaus Struder

Journal of Sports Science, Vol.3, pp.105-116

2015

DOI: https://doi.org/10.17265/2332-7839/2015.03.001

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Abstract

Biochemistry and Cell Biology

Oncology and Carcinogenesis

cerebral oxygenation

central fatigue

cortical current density

prefrontal cortex

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% O2) conditions respectively. EEG and NIRS recordings of the prefrontal cortex (PFC, Brodmann 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.

Details

Title: Electrocortical and Hemodynamic Changes within the Brain during Incremental Bicycle Exercise in Normoxia and Hypoxia—A Combined EEG/NIRS Study
Authors: Vera Abeln (Author) - German Sport University, Germany
Stefan Schneider (Author) - German Sport University, Germany
Axel Knicker (Author) - German Sport University, Germany
Thorsten Schiffer (Author) - German Sport University, Germany
Wildor Hollmann (Author) - German Sport University, Germany
Heiko Klaus Struder (Author) - German Sport University, Germany
Publication details: Journal of Sports Science, Vol.3, pp.105-116
Publisher: David Publishing Co., Inc.
Date published: 2015
DOI: 10.17265/2332-7839/2015.03.001
ISSN: 2332-7839
Organisation Unit: University of the Sunshine Coast, Queensland; School of Health and Sport Sciences - Legacy
Language: English
Record Identifier: 99449944802621
Output Type: Journal article

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