concept

oxygen saturation

Also known as: SpO2, oxygen saturation levels

Facts (25)

Sources

Sex differences in cardiorespiratory control under hypoxia - Frontiers frontiersin.org Frontiers Jan 30, 2025 16 facts

claimMales achieve lower oxygen saturation levels compared to females under acute hypoxia, and even with tachycardia and higher tidal volume, males fail to maintain preserved oxygen saturation.

claimMultiple studies have observed that females exhibit higher oxygen saturation levels compared to males under hypoxic conditions.

claimBoos et al. observed that females experience a greater increase in heart rate than males under hypoxia, while also tending to maintain higher oxygen saturation levels.

claimAdult females may present with higher oxygen saturation than males in normoxia, though this difference is not evident in newborns or prepubertal children.

measurementIn the study by Botek et al. (21), the average oxygen saturation achieved by participants was near 70%.

referenceKrejčí et al. (2018) published a study in Clinical Physiology and Functional Imaging titled 'Dynamics of the heart rate variability and oxygen saturation response to acute normobaric hypoxia within the first 10 min of exposure', which focuses on the immediate physiological response to hypoxia.

measurementA power analysis for the study revealed large effect sizes (f) of 0.68 for oxygen saturation (SpO2), 0.61 for heart rate (HR), and 0.52 for tidal volume (Vt).

measurementCardiovascular autonomic responses to hypoxia were consistent in females, but were only observed in males when they exhibited lower oxygen saturation.

referenceFrimer, Goldberg, Joseph, and Picard (2021) published a study in The Clinical Respiratory Journal titled 'Are there gender differences in blood oxygen saturation in prepubertal children?', which investigates whether sex-based differences in blood oxygen saturation exist in children before puberty.

measurementUnder normoxia, males have a pulse oxygen saturation (SpO2) of 98 ± 1% and females have 98 ± 1%; under iso-saturation hypoxia, males have 91 ± 3% and females have 92 ± 2%.

referenceLevental et al. (2018) identified a sex-linked difference in blood oxygen saturation.

claimIn short-term normobaric hypoxia, females preserve oxygen saturation and counterbalance hypoxemia primarily through tachycardia.

measurementIn the current investigation, the iso-saturation analysis achieved an average oxygen saturation near SpO2 91%, and the iso-time analysis showed males reached an average saturation near 87%.

claimUnder iso-time hypoxic conditions, females defend oxygen saturation over time better than males, and while there are no sex differences in cardiovascular responses, males utilize ventilatory compensation through greater tidal volume, whereas females do not.

referenceBoos and colleagues found in a study of 14 individuals (seven females) that females tend to maintain higher oxygen saturation than males after 150 minutes of normobaric hypoxia.

claimIn the study, females were observed to counterbalance hypoxia primarily through systemic circulatory adjustments, which preserved oxygen saturation, while males relied on both circulatory and ventilatory adjustments but experienced greater oxygen desaturation.

Sex differences in respiratory and circulatory cost during hypoxic ... nature.com Nature Jul 2, 2019 9 facts

claimThere was no significant main effect for sex on oxygen saturation (SpO2) in either normoxia or hypoxia conditions.

measurementIn a study of physiological responses to hypoxia, multiple regression analysis showed that the change in heart rate (ΔHR) was a significant factor in predicting the change in oxygen saturation (ΔSpO2) for both men (t(8) = -6.54, P = 0.001) and women (t(8) = -4.04, P = 0.010).

measurementThe relative contributions of energy expenditure (EE), ventilation (VE), and heart rate (HR) to the change in oxygen saturation (ΔSpO2) under hypoxic conditions differ by sex: in women, the effects of EE (28.1% vs 15.8% in men) and VE (4.1% vs 1.7% in men) were greater, while in men, the contribution of HR was greater (82.5% vs 67.9% in women).

measurementThe study measured heart rate (HR) using a POLAR RC800X monitor (POLAR Electro, Tokyo, Japan) and monitored oxygen saturation (SpO2) using a TM-2564G pulse oximeter (A&D, Tokyo, Japan) on the left middle finger.

referenceBilo et al. (2012) published a study in PLOS ONE titled 'Effects of slow deep breathing at high altitude on oxygen saturation, pulmonary and systemic hemodynamics'.

measurementIn hypoxia, oxygen saturation (SpO2) decreased by approximately 10% in men and approximately 14% in women from resting baselines.

measurementIn normoxia, oxygen saturation (SpO2) decreased by approximately 3% from resting baselines in both men and women.

claimThe study hypothesized that women would experience greater arterial hypoxemia than men, and that the contribution rates of energy expenditure, ventilation, and heart rate in response to changes in oxygen saturation would differ between the sexes.

referenceBernardi et al. (1998) published a study in The Lancet titled 'Effect of breathing rate on oxygen saturation and exercise performance in chronic heart failure'.