Intermittent hypoxia training effectively protects against cognitive decline caused by acute hypoxia exposure

Area of Science:

• Altitude Physiology
• Neuroscience
• Sports Science

Background:

• Intermittent hypoxia training (IHT) aids acclimatization and reduces acute mountain sickness (AMS) risk.
• The impact of IHT on cognitive and cerebrovascular function post-hypoxia is not well understood.

Purpose of the Study:

• To assess the efficacy of a simplified IHT paradigm in mitigating AMS.
• To investigate the effects of IHT on cognitive and neural functions during acute hypoxia.
• To evaluate IHT's influence on brain swelling and cerebral blood flow (CBF) after hypoxia.

Main Methods:

• A simplified intermittent hypoxia training (IHT) protocol was administered.
• Participants underwent acute hypoxia exposure at 4300m.
• Cognitive functions, neural alterations, brain swelling (MRI), and cerebral blood flow (CBF) were assessed.

Main Results:

• The IHT paradigm effectively relieved AMS symptoms at 4300m.
• IHT significantly improved cognitive functions, including working memory, conflict control, and cognitive control, while reducing mental fatigue.
• Magnetic resonance imaging showed a reversal of hypoxia-induced brain swelling in the IHT group.
• Increased cerebral blood flow (CBF) was observed in multiple brain regions in the IHT group post-hypoxia.

Conclusions:

• Simplified intermittent hypoxia training (IHT) facilitates acclimatization and alleviates AMS.
• IHT enhances cognitive performance and neural function under hypoxic conditions.
• IHT may ameliorate brain swelling and cognitive dysfunction by increasing cerebral blood flow.