A single exposure to 100% normo-baric oxygen therapy appears to improve sequence learning processes by increasing...

Area of Science:

• Neuroscience
• Human Physiology
• Cognitive Science

Background:

• Previous research demonstrated that normo-baric 100% oxygen treatment (NbOxTr) enhances motor learning, including visuomotor adaptation and sequence learning (SL).
• The physiological mechanisms underlying these behavioral improvements, particularly the role of brain oxygenation, remained unidentified.

Purpose of the Study:

• To investigate the effect of NbOxTr on the oxygen tissue saturation index (TSI) in the prefrontal cortex (PFC) during SL task performance.
• To determine if improvements in SL are correlated with increased TSI levels in the PFC.

Main Methods:

• Twenty-four healthy young adults were randomized into a NbOxTr group or a control group receiving normal air.
• Near-infrared spectroscopy (NIRS) measured oxygen TSI in the PFC during baseline, training, and testing phases of an SL task.
• Participants received their assigned treatment via nasal cannula throughout the experiment.

Main Results:

• NbOxTr significantly increased PFC TSI during the training phase (p < 0.01).
• NbOxTr positively influenced SL retention during the testing phase (p < 0.05).
• A positive correlation was observed between increased right PFC TSI and improved response time (RT) in SL training and retention (p < 0.05).

Conclusions:

• Normo-baric 100% oxygen treatment increases oxygenated hemoglobin availability in the PFC.
• This enhanced oxygenation appears to mediate the retention of sequence learning improvements in healthy young adults.
• Further research is warranted to explore oxygenation changes in other brain areas and in neurologically impaired populations.