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A major new study has found a notable connection between untreated sleep apnea and an increased risk of Parkinson's disease.
A team of researchers from Oregon Health and Science University (OHSU) studied more than 11 million veterans aged 40 and older who did not already have Parkinson's disease.
Some of them had been diagnosed with obstructive sleep apnea, a condition in which breathing repeatedly stops and starts during sleep. The researchers then tracked who went on to develop Parkinson's over an average of nearly five years.
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They also examined veterans who began continuous positive airway pressure (CPAP) therapy within two years of their sleep apnea diagnosis, searching for any difference in Parkinson's outcomes compared with those who delayed or never started CPAP.
Dr. Greg Scott, an Oregon-based pathologist and co-author of the study, called the findings "surprising" in a press release.
"People who still got Parkinson's but had been on CPAP had fewer fractures, fewer falls and lower mortality. We tested this rigorously and the result kept happening," he said.
The research, published in JAMA Neurology, draws on records from U.S. veterans who were treated through the Department of Veterans Affairs between 1999 and 2022. Data were adjusted for age, sex, race, smoking and other health factors.
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Veterans with untreated sleep apnea were almost twice as likely to develop Parkinson's as those without apnea, the study found. Over about five years, this translated into roughly one to two additional Parkinson's cases per 1,000 people.
Among veterans who began CPAP therapy early, the risk was about 30% lower.
That reduction amounted to approximately 2.3 fewer Parkinson's cases per 1,000 people, meaning that early CPAP treatment could prevent one case for every 439 individuals treated over five years.
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"The best strategy for a neurodegenerative disease is prevention and catching risk factors early, before the damage is done," said Scott.
The researchers propose several potential reasons for this link. Repeated drops in oxygen during sleep can damage neurons, increase inflammation and and interfere with the brain's ability to clear out waste, allowing toxic proteins to accumulate.
"If you stop breathing several times an hour and your oxygen levels are dropping … you're essentially stunning those brain cells every time that is happening," said Dr. Lee Neilson, OHSU neurologist and lead author of the study, in the same press release.
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By stabilizing oxygen and improving sleep continuity, scientists believe CPAP may reduce those stresses and protect brain tissue over time.
The study's authors emphasized, however, that their findings only show an association between the sleep disorder and neurological disease.
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Because this was an observational analysis, it cannot definitively prove that sleep apnea causes Parkinson's.
The team also lacked detailed data on how consistently participants used their CPAP devices. Also, most veterans in the study were older men, which means the results may not be generalized to other populations.
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Additionally, the researchers noted that early signs of Parkinson's, including sleep disturbances, might have led some individuals to be diagnosed with apnea in the first place.
