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Special considerations while measuring oxygen saturation

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Arterial Oxygen Desaturation Hinders Gamified Working Memory Performance.

Jason M Keeler¹, Jennifer B Listman², M Jo Hite¹

¹H.H. Morris Human Performance Laboratories, Department of Kinesiology, Indiana University School of Public Health, Bloomington, IN 47405, USA.

Military Medicine

|August 5, 2024

Summary

This summary is machine-generated.

Moderate hypoxia, or low oxygen levels, impairs cognitive function, specifically working memory performance in a gamified assessment. This study shows decreased oxygen saturation negatively impacts recall accuracy and reaction time, highlighting the need for monitoring in high-risk environments.

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Area of Science:

Aerospace Medicine
Environmental Physiology
Cognitive Neuroscience

Background:

Hypoxia poses a significant challenge to Warfighters in aviation and subterranean operations, reducing cognitive function.
Moderate hypoxia (FiO2 0.11-0.14) can impair complex tasks like working memory, with individualistic symptom recognition difficulties.
Gamified cognitive assessments may offer objective feedback for safety protocols during hypoxia, but their sensitivity is unproven.

Purpose of the Study:

To investigate whether gamified working memory assessments are sensitive to moderate normobaric hypoxia.
To test the hypothesis that moderate hypoxia decreases gamified working memory performance, considering individual arterial oxygen saturation responses.

Main Methods:

30 healthy adults completed a gamified working memory task (Backtracker) under moderate hypoxia (FiO2=0.138) and normoxia.
Assessments were conducted at baseline, 60, and 90 minutes post-exposure, with arterial oxyhemoglobin saturation (SpO2) monitored via pulse oximetry.
Data were analyzed using linear mixed effects modeling to account for individual responses.

Main Results:

Hypoxia significantly reduced SpO2 compared to normoxia.
Decreased SpO2 was associated with significant reductions in recalling the correct location and order of tiles.
Reduced SpO2 correlated with decreased median time to first tap and median time between taps, indicating faster, less planned movements.

Conclusions:

Moderate hypoxic exposure significantly hinders performance on a gamified working memory task.
Decreased SpO2 during hypoxia negatively impacts the accuracy of spatial and temporal memory recall.
Faster movement execution times under hypoxia may contribute to memory errors, underscoring the need for monitoring cognitive function.