01. Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed
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Browsing 01. Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed by Author "Abasiyanik, Zuhal"
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Conference Object Comparative Analysis of Comorbidities in Neuromyelitis Optica Spectrum Disorders and Multiple Sclerosis: Insights Into Disease Pathogenesis and Management(Sage Publications Ltd, 2024) Ozakbas, Serkan; Kaya, Ergi; Simsek, Yasemin; Abasiyanik, ZuhalConference Object Determinants of Walking Capacity in People With MS: The Role of Balance Confidence and Cognitive Function(Sage Publications Ltd, 2025) Abasiyanik, Zuhal; Unal, Gozde Deniz; Kara, Irem; Ozakbas, SerkanConference Object Different Gait Dynamics and Distance Walking/Gait Quality Fatigability Manifestation During the 6-Minute Walking in People With Multiple Sclerosis(Sage Publications Ltd, 2024) Santinelli, Felipe Balistieri; Ramari, Cintia; Abasiyanik, Zuhal; Gysemberg, Griet; Kos, Daphne; Ozakbas, Serkan; Feys, PeterConference Object Enhancing Cognitive Impairment Detection in Multiple Sclerosis: Exploring the Symbol Digit Modalities Test(Sage Publications Ltd, 2024) Kara, Irem; Unal, Gozde Deniz; Yigit, Pinar; Abasiyanik, Zuhal; Ozakbas, SerkanConference Object Evaluating Cognitive Impairment Detection in Multiple Sclerosis: Advancements in the Brief Visuospatial Memory Test-Revised(Sage Publications Ltd, 2024) Kara, Irem; Unal, Gozde Deniz; Yigit, Pinar; Abasiyanik, Zuhal; Ozakbas, SerkanConference Object Factors Influencing Self-Reported and Measured Walking Disability in Early-Stage Multiple Sclerosis(Sage Publications Ltd, 2024) Abasiyanik, Zuhal; Unal, Gozde Deniz; Ozakbas, SerkanConference Object High Prevalence of Falls and Near-Falls in Mild Multiple Sclerosis: A Hidden Clinical Concern(Sage Publications Ltd, 2025) Abasiyanik, Zuhal; Unal, Gozde Deniz; Zengin, Ela; Ozakbas, SerkanConference Object Impact of Body Weight on Five-Year Progression in Multiple Sclerosis: a Longitudinal Study(Sage Publications Ltd, 2024) Unal, Gozde Deniz; Abasiyanik, Zuhal; Simsek, Yasemin; Zengin, Ela; Ozakbas, SerkanConference Object Improving Cognitive Impairment Detection in Multiple Sclerosis: a Focus on the California Verbal Learning Test-Second Edition(Sage Publications Ltd, 2024) Kara, Irem; Unal, Gozde Deniz; Yigit, Pinar; Abasiyanik, Zuhal; Zengin, Ela; Ozakbas, SerkanConference Object Is Cognitive Impairment a Predictor of Physical Disability Progression in Multiple Sclerosis Over a Five-Year Period(Sage Publications Ltd, 2024) Abasiyanik, Zuhal; Yigit, Pinar; Kara, Irem; Unal, Gozde Deniz; Ozakbas, SerkanConference Object Machine Learning-Based Prediction of Disability Progression in Multiple Sclerosis Using Clinical, Performance-Based, and Patient-Reported Outcomes(Sage Publications Ltd, 2025) Abasiyanik, Zuhal; Ozturk, Orhan; Ozakbas, SerkanConference Object Natalizumab Treatment Outcomes and Safety Profile in Women With Multiple Sclerosis: Insights From Real-World Data(Sage Publications Ltd, 2024) Simsek, Yasemin; Abasiyanik, Zuhal; Samadzade, Ulvi; Ozakbas, SerkanConference Object Perceived and Performed Dual-Task Ability in Persons With Multiple Sclerosis: an International Multi-Centered Study(Sage Publications Ltd, 2024) Abasiyanik, Zuhal; Pedulla, Ludovico; Soler, Bernardita; Santoyo-Medina, Carme; Kahraman, Turhan; D'Hooge, Mieke; Tacchino, Andrea[No abstract available]Conference Object Prevalence and Correlates of Fear of Falling in People with Multiple Sclerosis Exhibiting No to Mild Disability(Sage Publications Ltd, 2024) Abasiyanik, Zuhal; Ertekin, Ozge; Kara, Tugce; Kahraman, Turhan; Ozakbas, SerkanConference Object Prevalence and Magnitude of Distance Walking Fatigability in People With Multiple Sclerosis(Sage Publications Ltd, 2024) Santinelli, Felipe Balistieri; Abasiyanik, Zuhal; Dalgas, Ulrik; Ozakbas, Serkan; Severijns, Deborah; Gebara, Benoit; Maamagi, Heigo[No abstract available]Letter Prevalence of Distance Walking Fatigability in Multiple Sclerosis According to MS Phenotype, Disability Severity and Walking Speed(Elsevier France-Éditions Scientifiques Médicales Elsevier, 2025) Santinelli, Felipe Balistieri; Abasiyanik, Zuhal; Dalgas, Ulrik; Ozakbas, Serkan; Severijns, Deborah; Gebara, Benoit; Feys, PeterArticle Citation - WoS: 1Citation - Scopus: 3Reliability and Construct Validity of Three Self-Report Questionnaires Assessing Dual-Task Difficulties in People With Multiple Sclerosis: an International Study(W B Saunders Co-elsevier inc, 2025) Abasiyanik, Zuhal; Pedulla, Ludovico; Kahraman, Turhan; D'Hooge, Mieke; Santoyo-Medina, Carme; Soler, Bernardita; Feys, PeterObjective: To evaluate the reliability and validity of the dual-tasking questionnaire (DTQ), dual-task screening list (DTSL), and dual-task impact on daily life activities questionnaire (DIDA-Q). Design: Multicenter, cross-sectional study Setting: Persons with multiple sclerosis (pwMS) were recruited from 7 multiple sclerosis centers across 6 countries (Belgium, Chile, Italy, Israel, Spain, and Turkey). Participants: A total of 356 pwMS (mean age 47.5 +/- 11.5y, expanded disability status scale, 3.79 +/- 1.83) were enrolled. Interventions: Not applicable Main Outcome Measures: The reliability (internal consistency, test-retest, and measurement error) and construct validity (structural and convergent) were assessed. Results: The DTQ, DTSL, and DIDA-Q demonstrated excellent test-retest reliability (intraclass correlation coefficients [95% CI], 0.84 [0.80-0.87] to 0.90 [0.87-0.92]) and internal consistency (Cronbach a: 0.86-0.96). As hypothesized, the 3 questionnaires showed a strong correlation with each other, moderate-to-strong correlations with other self-report questionnaires (perceived walking difficulties, fatigue, and fear of falling), and low- to-moderate correlations with cognitive information processing speed, manual dexterity, and dual-task walking performance (walking with word list generation task), showing convergent validity. The DIDA-Q exhibited systematically superior properties. These results were also verified in subsets from 6 different countries. In the structural validity analysis, all questionnaires displayed 2 main factors, allocated as "motor-driven" and "cognitive-driven" subscales. Conclusions: The DTQ, DTSL, and DIDA-Q have good-to-excellent measurement properties, with the highest properties observed in DIDA-Q. The use of these self-reported questionnaires can be used in research and clinical practice to assess the effect of dual-task difficulties on the daily life of ambulatory pwMS. (c) 2024 by the American Congress of Rehabilitation Medicine.Article Six-Spot Step Test Under Three Different Task Conditions To Assess Dual-Task Ability in People With Multiple Sclerosis(Taylor & Francis Ltd, 2025) Ertekin, Ozge; Abasiyanik, Zuhal; Kahraman, Turhan; Dastan, Seda; Ozakbas, SerkanBackground: The Six-Spot Step Test (SSST) is a valid measure to assess the ability of people with multiple sclerosis (pwMS) to maintain balance whilst challenging stability during walking. This study aimed to compare the performance of three different SSST conditions in pwMS and healthy controls (HC) and to explore whether incorporating cognitive tasks into the SSST improves its discriminative capacity by increasing cognitive load. Methods: Fifty-two pwMS (median EDSS = 1.75) and 19 HC were recruited. Participants performed the SSST under three different task conditions: conventional SSST, SSST with word-list generation task (WLG), and SSST with the serial-7 backward task. The dual-task cost (DTC) was calculated for two cognitive task conditions. Results: There was a significant difference across different SSST conditions in both groups. There was also significant condition*group interaction [F (2,132) = 3.69, p = 0.028, eta(2) = 0.053]. PwMS completed all SSST conditions in a longer duration compared to HC. The DTC of SSST with backward and WLG tasks was greater in the MS group than in HC. However, there was no significant differences in the number of correct answers during the dual-task conditions between pwMS and HC. All three conditions showed excellent discriminative ability between pwMS and HC (Area Under Curve value > 0.8). Significance: The SSST had the ability to discriminate between pwMS and HC in both conventional method and with secondary cognitive task. The SSST could be used to evaluate early walking and dual-task deficits even in pwMS with mild disability for future research and clinical practice.Article Sustained Attention and Gait Pattern Changes During the 6-Minute Walk Test in Persons with Multiple Sclerosis(Lippincott Williams & Wilkins, 2025) Abasiyanik, Zuhal; Kahraman, Turhan; Veldkamp, Renee; Ertekin, Ozge; Kalron, Alon; Ozakbas, Serkan; Feys, PeterBackground and purpose: It is unknown whether persons with multiple sclerosis (pwMS) can retain sustained attention and gait quality during long-distance walking tests. This study aimed to investigate changes in sustained attention and gait parameters during prolonged walking in pwMS with different levels of disability and healthy controls (HCs) and correlations of these changes with self-reported daily life difficulties. Methods: The 6-Minute Walk Test was performed with an auditory sustained attention task while wearing inertial measurement sensors. Participants were asked to respond verbally as quickly as possible to randomly presented auditory stimuli during 6 minutes of walking. The accuracy of answers, average reaction time, and gait parameters per minute were determined. Results: Thirty pwMS with mild disability (Expanded Disease Status Scale [EDSS] < 4.0), 16 pwMS with moderate-to-severe disability (EDSS 4.0 to 6.5), and 27 age-gender matched HCs were included. A significant group-by-time interaction effect as found for reactions times, which increased in mild and moderate-to-severe disability groups but not in HCs. Gait parameters deteriorated over time in all groups, but no significant group-by-time interaction was found. The decrease in sustained attention was not related to changes in gait or clinical outcomes, while deterioration in gait parameters was associated with perceived walking disability and dual-task difficulties in daily life. Discussion and Conclusions: Sustained attention during walking declined over time in pwMS, but not in HCs. However, gait parameters deteriorated in all groups. Worsening gait during simultaneous cognitive task execution may contribute to walking and dual-task difficulties in pwMS.Conference Object Tracking Walking Capacity in People With Multiple Sclerosis Without Disability: 3-Year Follow-Up of Objective and Subjective Gait Measures(Sage Publications Ltd, 2025) Abasiyanik, Zuhal; Baba, Cavid; Yigit, Pinar; Samadzade, Ulvi; Kahraman, Turhan; Ozakbas, Serkan
