Elevating understanding: Linking high-altitude hypoxia to brain aging through EEG functional connectivity and
Carlos Coronel-Oliveros1,2,3, Vicente Medel1,4,5, Grace Alma Whitaker6,7
1Latin American Brain Health Institute (BrainLat), Universidad Adolfo Ibáñez, Santiago, Chile.
Network Neuroscience (Cambridge, Mass.)
|April 2, 2024
Summary
High-altitude hypoxia alters brain activity, mimicking aging and Alzheimer's disease effects. This research validates high-altitude hypoxia as a model for studying brain function changes in aging and neurodegeneration.
Area of Science:
- Neuroscience
- Human Physiology
Background:
- High-altitude hypoxia induces cognitive and executive function deficits.
- These changes resemble those observed in healthy aging and Alzheimer's disease.
Purpose of the Study:
- To validate high-altitude hypoxia as a model for studying brain activity disruptions.
- To investigate the effects of hypoxia on electroencephalogram (EEG) power spectrum and functional connectivity.
Main Methods:
- Collected EEG data from 16 healthy volunteers at sea level and 4,000 masl.
- Analyzed relative power changes, aperiodic slope (1/f), and weighted phase lag index (wPLI).
- Applied graph theory to assess functional segregation and integration.
Main Results:
- Hypoxia caused slower brain oscillations (increased delta, decreased alpha power) and a flattened aperiodic slope, indicating increased electrophysiological noise.
- Functional integration in the theta band strengthened, with specific topographical patterns observed.
- Age correlated with aperiodic slope and theta band integration; hypoxia effects remained significant after age adjustment.
Conclusions:
- High-altitude hypoxia induces brain activity patterns similar to aging and neurodegenerative conditions.
- This validates high-altitude hypoxia as a valuable model for understanding brain function in health and disease.
- Findings highlight the impact of reduced oxygen on neural network dynamics.
