New laboratory research links untreated obstructive sleep apnea to accelerated cardiovascular aging and an increased risk of early death. Using a long-term mouse model that recreated the intermittent drops in oxygen seen in human sleep apnea, researchers exposed mice to intermittent hypoxia during the hours that correspond to normal sleep behavior in mice and then followed their health across the animals' lifespan.
Mice exposed to prolonged intermittent hypoxia showed significantly higher mortality than animals kept under normal oxygen. The experimental model produced several clear signs of accelerated cardiovascular aging, including increased blood pressure, impaired heart function, reduced vascular flexibility, diminished coronary flow reserve, and abnormalities in cardiac electrical activity.
The authors conclude that chronic physiological stress from untreated sleep apnea alters cardiovascular structure and function in ways that can shorten lifespan. Mohammad Badran said the cumulative burden accelerates biological aging and raises mortality risk. David Gozal noted that the model removes other confounding factors and shows that untreated sleep apnea is a progressive, potentially fatal condition. The study appears in npj Aging and was reported by the University of Missouri.
Difficult words
- obstructive sleep apnea — sleep disorder with repeated airway blockage during sleep
- intermittent hypoxia — periodic drops in body oxygen levels
- mortality — number of deaths in a group
- accelerated — becoming faster than the normal rate
- cardiovascular — relating to the heart and blood vessels
- coronary flow reserve — heart artery ability to increase blood flow
- confounding factor — other influence that changes study resultsconfounding factors
- physiological stress — body response to long-term physical strain
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How might treating sleep apnea change long-term heart health for patients?
- What challenges could doctors face when trying to reduce the cumulative burden of sleep apnea?
- Do you think results from a mouse model can apply to humans? Why or why not?
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