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Researchers look to the brain to explain gender differences in sleep apnea

The neural pathways between two areas of the brain that control the tongue -- and their interactions with each other -- may hold the key as to why men suffer sleep apnea much more than women.

A University of Wisconsin research team has theorized that either the caudal raphe or the hypoglossal nucleus -- or both together -- play roles in sleep apnea. The researchers have turned their attention to these two areas of the brain because of the roles they play in controlling the tongue. Diminished tongue control is a major cause of obstructive sleep apnea, a serious condition which strikes men much more frequently than pre-menopausal women, said lead researcher Jessica R. Barker.

*Paper presentation: "Sexual dimorphism in serotonergic input to the hypoglossal nucleus," by Jessica R. Barker and Mary Behan of the University of Wisconsin-Madison School of Veterinary Medicine, will be presented 12:45 p.m.-3 p.m. Monday April 3, Control of Breathing: Central Connectivity and Neurotransmission, 479.8 /board # C566 in the Convention Center Exhibit Hall. Poster is on view 7:30 a.m. to 6 p.m.

Sleep apnea affects millions of Americans, produces loud snoring and may interfere with the sleep of other family members. It leaves sufferers drowsy during the day and places them at greater risk of getting into an automobile accident and of developing serious illnesses such as hypertension and heart disease.

Estrogen, serotonin play roles

Previous research from Behan's lab has found evidence that estrogen plays a role in respiratory control and may provide protection against hypoxia. Other research shows that post-menopausal women on hormone replacement therapy suffer less from sleep apnea than post-menopausal women not on hormones, further strengthening the theory that estrogen plays a protective role.

The unique theory could explain why men and post-menopausal women not on hormone therapy are much more likely to suffer from the condition
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Contact: Christine Guilfoy
cguilfoy@the-aps.org
301-634-7253
American Physiological Society
4-Apr-2006


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