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    Jaw Movement During Sleep

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    Jaw_Movement_During_Sleep_Thesis.pdf (2.451Mb)
    Date
    2008-09-04
    Author
    Le Huquet, Ariel
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    Abstract
    Objective: We aim to improve our understanding of sleep physiology by describing the

    changes in mandibular position during sleep in normal subjects. Methods: We developed

    a novel method for mapping mandibular position simultaneously in three dimensions

    (anteroposterior, vertical and lateral) using magneto-resistive sensors strategically placed

    around 3 different moving joints on an external apparatus attached to the head and

    mandible. Spherical coordinates derived from these sensors provided information of jaw

    position in each of the three measurement planes. We assessed changes in jaw position in

    twelve healthy subjects (6 male, 6 female) aged (mean ± SD) 23 ± 7 years, Body Mass

    Index 22.5 ± 3.4 kg/m2, and with nasal resistance 3.24 ± 0.67 cmH2O/L/s by recording

    mandibular position simultaneously with overnight sleep polysomnography. Results: Jaw

    position was significantly influenced by sleep stage (p<0.001). The transition from wake

    to light sleep (stage one) was accompanied by significant jaw closure and jaw protrusion

    (p<0.05). As non-rapid-eye-movement (NREM) sleep deepened from stages 1 through

    slow wave sleep (SWS), vertical jaw opening (p<0.05) and posterior jaw movement

    progressively increased (p<0.05). REM sleep was associated with the greatest degree of

    jaw opening of all sleep stages (p<0.05). Lateral jaw position was not significantly

    different between sleep stages. Conclusion: This study describes, for the first time, an

    accurate method of measuring changes in mandibular position during sleep in all three

    dimensions. The observed changes during sleep in healthy subjects suggest a

    simultaneous modulation of upper airway muscular tone, which may be important in the

    understanding of upper airway occlusion in Obstructive Sleep Apnea.
    URI for this record
    http://hdl.handle.net/1974/1403
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    • Physiology Graduate Theses (July 2007 - Sept 2016)
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