Browsing by Author "Gundogdu, Nevhiz"

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Investigation of the Relationship Between the Viscoelastic Properties and Muscle Strength of Accessory Respiratory Muscles in Obstructive Sleep Apnea
(W B Saunders Co Ltd, 2026) Ramazanoglu, Engin; Yildiz, Guldeste; Sahin, Gulsum Eda; Kara, Emine; Yaprak, Feride; Bagci, Burcu; Gundogdu, Nevhiz
Background: The link between respiratory muscle strength and viscoelastic properties of accessory muscles offers a perspective for individualized treatment in Obstructive Sleep Apnea Syndrome (OSAS). Purpose: This study investigated associations between respiratory muscle strength and viscoelastic properties of the sternocleidomastoid (SCM) and rectus abdominis (RA) in OSAS. Methods: Patients with moderate (n = 33) and severe OSAS (n = 45) diagnosed by polysomnography were included. Muscle viscoelasticity was assessed using Myoton (R) PRO, and respiratory strength (maximal inspiratory (MIP), maximal expiratory pressure (MEP)) was measured by spirometer at rest and during maximal efforts. Results: In moderate OSAS, MEP-best correlated negatively with left SCM elasticity at rest (r =-0.622, p < 0.001), elasticity during inspiration (r =-0.401, p = 0.021), and stiffness (r =-0.357, p = 0.041). In severe OSAS, MEP-best correlated negatively with left SCM stiffness (r =-0.380), right SCM elasticity at rest (r =-0.393) and inspiration (r =-0.495), and left SCM elasticity during expiration (r =-0.323). MIP-best correlated negatively with right SCM elasticity during inspiration (r =-0.301) and left SCM elasticity during expiration (r =-0.323). Age correlated positively with SCM and RA parameters, while AHI correlated negatively with SCM and RA stiffness/elasticity, especially left RA elasticity during expiration (r =-0.544, p < 0.001). Side-specific differences were noted. Conclusion: Both inspiratory (SCM) and expiratory (RA) muscles are important in OSAS. With greater severity, viscoelastic properties shift from active support to passive adaptation, with RA contributing alongside SCM to functional changes.
Respiratory Function and Facial Muscle Mechanics in Chronic Obstructive Pulmonary Disease: The Role of Pursed-Lip Breathing
(Springer, 2025) Bagci, Burcu; Ramazanoglu, Engin; Maden, Cagtay; Gundogdu, Nevhiz
Background Pursed-lip breathing (PLB) is common in chronic obstructive pulmonary disease (COPD) as both a compensatory pattern and a rehabilitation technique, yet the biomechanical properties of the orbicularis oris and buccinator muscles remain underexplored. Aims The aim of this study was to compare the tone and viscoelastic properties of the orbicularis oris and buccinator muscles among COPD patients with PLB, COPD patients without PLB, and healthy controls, and to examine the relationship of these parameters with pulmonary function. Subjects and methods This prospective observational study included 67 participants: COPD with PLB (n = 21), COPD without PLB (n = 22), and healthy controls (n = 24). Inclusion criteria were age 40-65 years, body mass index 18.5-29.9 kg/m(2), and clinically stable COPD (GOLD stage 1-3). Muscle biomechanics were assessed using the Myoton (R) PRO device, and pulmonary function was evaluated by spirometry in accordance with ATS/ERS standards. Results In the COPD group with PLB, FVC, FEV1, and FEV1/FVC values were significantly lower compared to the non-PLB group (p < 0.05). Both COPD groups demonstrated higher tone and stiffness but lower elasticity in the orbicularis oris and buccinator muscles compared with healthy controls (p < 0.05). No significant differences were observed between COPD subgroups. In the PLB group, orbicularis oris elasticity showed a negative correlation with FVC (r = - 0.547) and FEV1 (r = - 0.614). Conclusion In COPD, PLB is both a compensatory pattern and a marker of disease severity. Reduced orbicularis oris elasticity relates to impaired lung function, and facial muscle biomechanics may serve as a non-invasive biomarker, supporting the inclusion of orofacial muscles in rehabilitation.