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    Diagnostic utility of deep tendon reflex responses in rectus femoris and triceps brachii in fibromyalgia: a clinical and electrophysiological study
    (Springer Heidelberg, 2025) Benlidayi, Ilke Coskun; Deniz, Volkan; Ornek, Ceren; Sariyildiz, Aylin
    The aim of this study was to evaluate deep tendon reflex responses and associated electrophysiological parameters of the muscles in patients with fibromyalgia. This cross-sectional study included 38 patients with fibromyalgia and 32 age- and sex-matched controls. Deep tendon reflexes of the rectus femoris and triceps brachii were tested using a reflex hammer. Electromyographic (amplitude and duration of activation), inertial measurement unit (angular velocity, acceleration), and electromechanical (delay) analyses were performed using a surface electromyography (sEMG) device. Comparative analyses were carried out between patients and controls. Additionally, Receiver Operating Characteristic (ROC) analysis was performed to evaluate the ability of hyperreflexia in distinguishing fibromyalgia patients from controls. Hyperactive deep tendon reflexes in the right/left rectus femoris and/or triceps brachii were observed in more than 85% (ranging from 86.8 to 94.7%) of the fibromyalgia group. Patients with fibromyalgia exhibited significantly increased deep tendon reflex responses compared to controls (p < 0.001). Patients revealed significantly higher amplitude, longer duration of muscle activation, greater sagittal acceleration and angular velocity, and shorter electromechanical delay. Normalized muscle activation (right and left rectus femoris and right triceps brachii) in response to deep tendon reflex test showed acceptable ability in differentiating fibromyalgia patients from controls (Area under curve (AUC) = 0.890, 0.784 and 0.782, respectively). For the right rectus femoris, values <= 28.3 (clinically corresponding to normoactive/hypoactive deep tendon reflexes) appeared to rule-out fibromyalgia with 94.1% sensitivity and 61.3% specificity. Patients with fibromyalgia exhibit increased deep tendon reflex responses. Normal or decreased deep tendon reflex responses may probably be used as a rule-out criterion for fibromyalgia.
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    The effect of balance exercises on central sensitization in patients with knee osteoarthritis
    (Springer Heidelberg, 2024) Tirasci, Emre; Sarpel, Tunay; Benlidayi, Ilke Coskun; Deniz, Volkan
    The aim of this study was to evaluate the effectiveness of balance exercises on functional status, pain, balance, and central sensitization in patients with knee osteoarthritis (OA). Patients diagnosed with bilateral Kellgren-Lawrence grade >= 2 primary knee OA and associated central sensitization were included in the study. Patients were randomized into two groups. Both groups were provided with verbal and written information on knee OA. In addition, the intervention group received a supervised balance exercise program for 6 weeks, 3 days a week on alternating days. The outcome measures were the changes in the Central Sensitization Inventory (CSI), Visual Analog Scale (VAS) pain, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), Berg Balance Scale, and Y Balance Test. Evaluations were performed at baseline, immediately after treatment (6th week) and at 12th week. The study included 40 patients, 20 patients in each group. At the end of the treatment period (6th week), the improvement in CSI score, WOMAC pain, WOMAC physical function, WOMAC total score, Y Balance Test scores, and VAS pain during activity was significantly greater in the intervention group than that in the control group (p < 0.001). Regarding the changes from baseline to the 12th week, the intervention group experienced greater improvement in most of the outcome measures. Yet, the change in WOMAC pain score, Berg Balance Scale score, and VAS pain at rest was similar between the study groups (p = 0.05, p = 0.257, and p = 0.385, respectively). A two-model multiple linear regression analysis revealed that the changes in VAS pain (during activity) after the treatment and at follow-up [(p = 0.004, adjusted R-2: 0.346) and (p = 0.002, adjusted R-2: 0.391), respectively], as well as changes in WOMAC pain from baseline to follow-up (p = 0.020, Delta R-2 = 0.245) significantly affected central sensitization. However, changes in Y Balance Test and WOMAC total scores did not appear to have a significant impact on the improvement in central sensitization (p > 0.05). Balance exercises may provide improvement in central sensitization, functional status, and dynamic balance among patients with knee OA. The improvement in central sensitization depends mostly on the pain relief effect of balance exercises