Person: AKALAN, NAZİF EKİN
Now showing 1 - 8 of 8
Publication Metadata onlyYürüme esnasındaki gövde-baş açısı ölçümü için kablosuz çift ivmeölçerli giyilebilir sistem(IEEE, 2018) AKALAN, NAZİF EKİN; GÜRKAN, GÜRAY; ÖNERGE, KÜBRA; 113297; 283338; 176320Literatürde, yere bakarak yürümenin yürüme parametrelerini ve ayak basıncını değiştirebileceği ile ilgili bilindik bir çalışma bulunmamaktadır. Bu çalışmada, yürüme esnasında gövde-baş açı değişimini ölçebilen bir sistem sunulmaktadır. Sistemin donanım kısmı, oksipital ve sırt bölgelerine yerleştirilen iki adet 3 eksenli sayısal ivmeölçer, mikroişlemci, Bluetooth modülü ve bataryadan oluşmaktadır. Mikroişlemcinin aldığı ivme verisi Bluetooth aracılığı ile alıcı bilgisayara gönderilmektedir. Verinin alınması, açı kestiriminin yapılması ve görselleştirilmesi, sistemin yazılım kısmını oluşturan ve Python dilinde geliştirilen kullanıcı arayüzü ile yapılmaktadır. Geliştirilen sistem hem iki serbestlik dereceli bir kol üzerinde hem de yürüme sırasında bir kullanıcı üzerinde test edilmiştir. Publication Metadata onlyPilot Study on Obstetric Brachial Plexus Paralysis: Docs Arm Swing Asymmetry Affect Foot Plantar Pressure Behavior?(2019-09) Kuchimov, Shavkat Nadir; AKALAN, NAZİF EKİN; 176320Introduction Brachial plexus palsy, as one of the most common congenital injuries affected by arm swing, is characterized by muscle weakness at different levels in the upper extremity (1). As the weakness of the upper extremity muscles can affect the trunk muscles and the postural development, these children may have some gait deviations (2,3). Previous studies have shown that walking parameters are also influenced by clinical conditions such as stroke and cerebral palsy (2-6). There is a lack of literature on determining the biomechanical influences of arm swing asymmetry on foot pressure behavior for OBBP children. Therefore, the aim of the study was determining arm-swing asymmetry related foot pressure behavioral alterations on OBBP. Research Question Does arm swing asymmetry affect foot plantar pressure behavior on OBBP patients? Methods Thirteen children with OBPP (7 females, 6 males) (mean age:9.37±2.68 years) participated in the study. For all individuals, a digital plantar-pressure analysis system (Win-track, Balma, France) was utilized to analyze the foot pressure behavior during standing and walking with self-selected velocity. The magnitude of the first and the second peak forces divided to an invidual’s weight (Fl, F2), total stance duration (Ts), time of Fl (Tl), time of min force between F1-F2 (T2), time o f F2 (T3), step length were calculated. Each stance phase was divided into five sub-phases: Loading response (Tl/Ts), mid-stance (T2-Tl/Ts), terminal stance (T3-T2/Ts) and pre-swing (Ts-T3/Ts), single limb support (T3-Tl/Ts) (7). In addition, arm swing ranges were recorded and analyzed using Kinovea software (8). Paired t-test was used for the compared between affected side and non-affected side (p < 0.05). Results Fl, pre-swing duration and step length were higher in affected side than in non-affected side(p<0.05). Single limb support duration lower in affected side than in non-affected side (p<0.05). The maximum arm flexion and extension angle and arm swing range were significantly reduced on the affected side (p<0.05). No significant difference was found in F2, loading response duration, mid-stance duration and terminal stance duration between affected side and non-affected side (Table 1). Discussion The reduced arm swing may alter the foot pressure behavior during walking on affected side as well as the non-affected side in children with OBBP. Reduced single limb support duration ((T3-Tl)/Ts) on the affected side indicate the stability problem in stance on affected side. Increase the first vertical peak force (Fl) on the affected side is probably related to the decreased arm extension range at the affected side, which absorbs the first peak of vertical force in early stance during walking. Increased step length on the affected side may due to the enhanced single limb duration on the non-affected side. Publication Metadata onlyFemoral Anteversiyon Artışı Olan Çocuklarda Hipermobilite, Kas Kuvveti ve 3 Boyutlu Yürüme Analizi Parametreleri Arasındaki İlişki(2019-10-18) EVRENDILEK, HALENUR; Karaca, Gülşah; Ertürk, Gamze; Bilgili, Fuat; AKALAN, NAZİF EKİN; ÖNERGE, KÜBRAAMAÇ Çalışmanın amacı; femoral anteversiyon artışı (FAA) olan çocuklarda hipermobilite, kas kuvveti ve 3 boyutlu yürüme analizi parametreleri arasındaki ilişkiyi araştırmaktır. YÖNTEM FAA olan 7 çocuk (14 bacak, ort.yaş:9.14 ± 0.3, trokanter prominens açı testi(TPAT):28 ± 6.2°) çalışmaya dahil edildi. Çocukların femoral anteversiyon açıları, eklem mobiliteleri ve maksimal izometrik kas kuvvetleri sırasıyla TPAT, Beighton testi ve el dinamometresiyle (Lafayette Instruments,USA) değerlendirildi. Tüm katılımcılara normal hızlarında yürürken 3 boyutlu yürüme analizleri yapılarak pelvis, kalça ve diz kinematik parametreleri incelendi. Parametreler arasındaki ilişkiler, verilerin normal dağılımlarına göre Pearson ve Spearman korelasyon testleri kullanılarak değerlendirildi. Verilerin istatistiksel olarak anlamlılık düzeyi (p<0.05) olarak kabul edildi ve sonuçlar Cohen sınıflamasına göre yorumlandı. BULGULAR Beighton testi skoru ile kalça ekstansör(r: -.70) ve diz ekstansör(r: -.91) kas kuvvetleri, minimum diz fleksiyon açısı(r: -.83) arasında yüksek korelasyon bulundu. TPAT değerleri ise kalça abduktör kas kuvveti(r: -.77) ve ortalama kalça rotasyon açısıyla yüksek korelasyon gösterdi(r: .60). TARTIŞMA Literatürde, FAA olan çocukların yürüme sırasında ortalama kalça iç rotasyon, pelvik oblikite ve duruş fazında diz ekstansiyon parametrelerinin arttığı gösterilmiştir. Bu çalışma, zayıf kalça ekstansör ve abduktür, diz fleksör ve ekstansör kaslarındaki zayıflığın kinematik değişimlerle ilişkili olabildiğini göstermiştir. Ayrıca, literatürle uyumlu olarak ortalama kalça internal rotasyon parametresiyle kalça abdüktör kas kuvvetinin TPAT açısıyla anlamlı olarak ilişkili olduğu bulumuştur. FAA olan çocuklarda sıkça görülebilen hipermobilitenin, kalça ve diz ekstansör kas zayıflığı ile duruş fazında hiperekstansiyon artışında rolü olabilir. Sonuç olarak, kalça abdüktör ve ekstansör, diz fleksör ve ekstansör kas kuvvetlerinin arttırılması, FAA olan hipermobil çocuklarda alt ekstremite fonksiyonun iyileştirilmesi için önemlidir. Publication Metadata onlyKinesiology of the Human Gait(Elsevier, 2020) AKALAN, NAZİF EKİN; Angın, SalihGait is one of the most complex functional activity which takes 7 years in average to learn and there are many factors such as music that is listened to, momentary psychogenic state, exhaustion, happiness, anger, etc. may affect the gait characteristics. Gait is a common activity in our daily lives. People who experience pain in only one phase of gait do not feel it only once a day. This situation is unacceptable for the human body and, thus, causes automatic, compensatory changes in a short time. In this section, the fundamentals of normal gait, its sub-phases, and the biomechanical events under these phases are explained. Publication Metadata onlyFunctional Bandaging in Children with Idiopathic Toe-Walking(NLM (Medline), 2023) Tuncer, Deniz; AKALAN, NAZİF EKİN; Çalışkan, M. Mine; Temelli, Yener; Yiğit, PakizeBackground: Idiopathic toe-walking (ITW) is a persistent gait pattern with no known etiology characterized as premature heel rise or no heel contact. We investigated the effects of functional bandaging in children with ITW on heel contact during stance phase and on gait quality. Methods: Nineteen children aged 4 to 16 years with ITW and ten age-matched healthy children were included in the study. Elastic adhesive bandages were applied to children with ITW to assist with dorsiflexion. Before bandaging (T0) and immediately (T1) and 1 week (T2) after initial bandaging, the initial contact, loading response, and midstance subphases of gait were analyzed using light pressure sensors and the Edinburgh Visual Gait Score (EVGS). Ten age-matched children with typical gait participated for comparison in T0. The data were analyzed with Friedman and Wilcoxon signed rank tests for within-group comparisons and Mann-Whitney U tests for between-group comparisons. Results: In T0, for the ITW group, no heel contact was observed during stance. In T1, all of the participants achieved heel contact at initial contact and loading response and 56.8% at midstance. In T2, all of the heels continued contact at initial contact and loading response and 54.3% at midstance. The EVGS significantly improved. The Friedman test showed that there were noteworthy improvements between T0-T1 and T0-T2 in video-based observational gait analysis and EVGSs (P < .001), although no difference was found between T1-T2 in video-based observational gait analysis (P = .913) and EVGSs (P = .450). Conclusions: In children with ITW, dorsiflexion assistive functional bandaging was an effective tool to help achieve heel contact on the ground and improve walking quality for a short period after application. Further studies with longer follow-up and larger sample sizes are required to confirm the long-term therapeutic effects of this promising functional bandaging. Publication Metadata onlyA novel dorsal trimline approach for passive-dynamic ankle-foot orthoses(Assoc Mechanical Engineers Technicians Slovenia, Po Box 197-Iv, Ljubljana 61001, Slovenia, 2018) Sürmen, Hasan Kemal; Fetvacı, Mahmut Cüneyt; Arslan, Yunus Ziya; AKALAN, NAZİF EKİN; 123435; 176320; 19199; 110120An ankle-foot orthosis (AFO) is an externally applied assistive device that encompasses the lower leg, ankle, and foot of the human body. In the current one-piece passive-dynamic AFO design, the trimming process is performed from lateral and medial parts of the ankle to ensure desired rotational displacement (hereafter referred to as Design I). In most cases, stress concentrations occurring over the trimmed regions during walking can cause permanent damage to the AFO. In this study, to reduce the stress concentration and ensure a homogeneous stress distribution, a new trimming approach is presented, in which the trim zones were transferred from lateral and medial to dorsal (hereafter referred to as Design II). Finite element analyses of the Designs I and II models were carried out. Displacement and von Mises stress values for both models under the same loading and boundary conditions were obtained. Maximum displacement values were 8.51 mm and 9.05 mm for Design I and Design II, respectively. Maximum stress values were 15.19 MPa and 6.70 MPa for Design I and Design II, respectively. For the similar range of motion of ankle joint, the novel design produced less stress and more homogeneous stress distribution than the currently used design, thus indicating that Design II would be more resistant to plastic deformation than Design I. Publication Metadata onlyGait analysis of patients subjected to the atrophic mandible augmentation with Iliac bone graft(HINDAWI LTD, ADAM HOUSE, 3RD FLR, 1 FITZROY SQ, LONDON, W1T 5HF, ENGLAND, 2019) Temelli, Yener; Arslan, Yunus Ziya; Cansız, Erol; Karabulut, Derya; Doğru, Suzan Cansel; AKALAN, NAZİF EKİN; 190878; 110120; 42880; 249199; 181247; 176320In this study, we aimed to quantitatively monitor and describe the gait functions of patients, who underwent iliac crest bone grafting in atrophic jaw augmentation operation, by taking into account the alterations of gait parameters and muscle forces in the early recovery course. To do so, temporospatial and kinematic gait parameters of ten patients during pre- and postoperative periods were recorded, and forces of the gluteus medius, gluteus maximus, and iliacus muscles were calculated. Three postoperative periods were specified as one week (post-op1), two weeks (post-op2), and three weeks (post-op3) after the surgery. Restoring process of the gait patterns was comparatively evaluated by analyzing the gait parameters and muscle forces for pre- and postoperative periods. Temporospatial and kinematic parameters of post-op3 were closer to those obtained in pre-op than those in post-op1 and post-op2 (p<0.05). Muscle forces calculated in post-op3 showed the best agreement with those in pre-op among the postoperative periods in terms of both magnitude and correlation (p<0.05). In conclusion, the patients began to regain their preoperative gait characteristics from the second week after surgery, but complete recovery in gait was observed three weeks after the surgery.