methods inspiratory oral airway resistance to airflow (ro) was measured in 13 awake patients with osa in both the upright and supine positions (neck position constant). subjects were studied first in the upright (seated) position and then supine. there was a significant negative correlation between the total rdi and the percentage of total sleep time in the supine position (p<0.007). in most of the patients ro increased from the upright to the supine posture but there is considerable variability in the magnitude of the change.
the increase in ro found with change in body position in patients with osa is in contrast to results obtained in normal subjects using the same technique.13 in this latter study there was no significant difference in ro when upright and supine in a group of 17 normal men. a feature of our findings was the negative relationship between the change in ro when in the supine position and the severity of osa as measured by rdi. in contrast to our previous study in normal subjects,12values for the a constant of the fitted power function in the present study also increased significantly when patients moved from the upright to the supine position. you will be able to get a quick price and instant permission to reuse the content in many different ways.
overweight and obese people may make up as much as 70% of those with osa, and weight loss reliably eases the symptoms of the disorder and sometimes resolves the problem altogether, according to a 2006 study. now, researchers think most of this improvement can be attributed to a reduction in tongue fat, specifically. to find out how fat buildup in the tongue relates to sleep apnea symptoms, schwab and his co-authors gathered 67 people with osa and bmis greater than 30.0, which is considered obese. the team also evaluated the severity of the participants’ sleep apnea before and after their weight loss by observing each person in a sleep study.
the tongue appears to be the primary driver of the disorder, at least in this study’s participants. understanding the role of tongue fat in osa could pave the way for new treatments, schwab added. she holds degrees in neuroscience and dance from the university of florida and a graduate certificate in science communication from the university of california, santa cruz. live science is part of future us inc, an international media group and leading digital publisher.
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