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Six men and three women, asymptomatic light snorers ranging in age from 25-34 years, were studied during sleep to determine the prevalence of snoring in the different sleep stages, the associated changes in oxygen saturation (SaO2), heart rate (HR), and breathing frequency (f), and the associated breathing arrhythmias. Snoring was defined as a 1-minute epoch with more than 80% of the breaths associated with snores. Most of the snoring epochs as well as the apneas and hypopneas occurred during stage 2, mainly because it is the most prolonged sleep stage. The prevalence of snoring, however, normalized for differences in length of sleep stages, was highest in stages 3 and 4 but low in REM, whereas the converse was true for apneas and hypopneas. Snoring caused no change in the mean SaO2, mean HR, or f, as compared with nonsnoring periods in the same sleep stage. Continuous snoring in normal subjects can occur without significant O2 desaturation or breathing arrhythmia. Continuous snoring and breathing arrhythmia tended to occur together in a given subject but were unrelated in time, suggesting a different pathogenesis.

Snoring in Normal Young Adults: Prevalence in Sleep Stages and Associated Changes in Oxygen Saturation, Heart Rate, and Breathing Pattern