Smartwatch Tool Identifies Moderate to Severe Sleep Apnea Risk

Validation Study Measures Smartwatch Sleep Apnea Detection

A consumer smartwatch can accurately screen adults for moderate-to-severe obstructive sleep apnea (OSA).

In a clinical validation study published in the Journal of Clinical Sleep Medicine, researchers evaluated the Sleep Apnea Feature on the Samsung Galaxy Watch 6. The trial involved 147 adult participants with an average age of 54 years.

Each participant had a prior diagnosis of moderate-to-severe OSA or a high pretest likelihood of having the condition.

Detection Accuracy Across Multi-Night Sleep Testing

The smartwatch correctly distinguished participants with moderate-to-severe sleep apnea 94 percent of the time at its default setting.

Testing showed a 94 percent sensitivity and a 67 percent specificity in the study cohort. Among individuals with high hypoxic burden, which marks low blood oxygen saturation, the tool achieved 100 percent sensitivity and 100 percent specificity.

Participants wore the device across multiple nights, including two nights at the Stanford Health Care Sleep Medicine Center and three nights at home.

Health Risks Associated With Untreated Airway Obstruction

Obstructive sleep apnea causes breathing to repeatedly stop or become restricted during sleep due to upper airway blockage.

According to the American Academy of Sleep Medicine (AASM), untreated sleep apnea increases the risk of stroke, heart attacks, depression, and motor vehicle accidents.

Repeated nighttime oxygen drops disrupt physical recovery and place ongoing stress on cardiovascular function.

Clinical Screening Distinctions and Study Limitations

Wearable screening features serve as risk flags rather than formal medical diagnoses.

Lead author Arash Alavi and principal investigator Dr. Robson Capasso noted that smartwatches cannot replace clinical polysomnography. The study also evaluated a group that already had confirmed OSA or high pretest risk, which limits how the 67 percent specificity rate applies to the general population.

A negative smartwatch reading does not eliminate the possibility of mild sleep-disordered breathing or other sleep issues.

Next Steps for People Showing Sleep Symptoms

Identifying nighttime breathing disruptions allows individuals to seek timely medical evaluation and standard therapies.

Clinical interventions for confirmed moderate-to-severe OSA include positive airway pressure (PAP) therapy and weight management strategies.

Anyone who notices habitual snoring, gasping, or choking during sleep can talk to a doctor or an AASM-accredited sleep center to schedule formal diagnostic testing.