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Acta of Bioengineering and Biomechanics

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https://www.readbyqxmd.com/read/29658534/the-influence-of-osteoporotic-bone-structures-of-the-pelvic-hip-complex-on-stress-distribution-under-impact-load
#1
Katarzyna Arkusz, Tomasz Klekiel, Niezgoda Niezgoda, Romuald Będziński
PURPOSE: The aim of this study was to determine the effect of bone mineral density (BMD) on the stress distribution in pelvic-hip complex (PHC) model which included bone structures and soft tissues. Bone mass changes in osteoporosis and osteopenia were considered in this analysis. In addition, the relations between force direction and stress distribution causing PHC fractures were determined. METHODS: This paper presents the development and validation of a detailed 3D finite element model with high anatomical fidelity of the PHC and BMD changes in trabecular and cortical bones, modelled based on CT scans...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658533/accelerometer-profile-of-motion-of-the-pelvic-girdle-in-butterfly-swimming
#2
Zbigniew Staniak, Krzysztof Buśko, Michał Górski, Anna Pastuszak
PURPOSE: The aim of the study was to develop a method to measure and analyse kinematics of movement of the pelvic girdle in butterfly swimming in order to support training of technical skills. METHODS: A device for recording triaxial accelerations and triaxial rotational angular velocities was mounted on the dorsal part of the pelvic girdle of athlete. The measurements were performed in ten elite butterfly swimmers (age: 23.1 ± 3.7 years, body height: 187.6 ± 4...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658532/changes-of-albumin-secondary-structure-after-palmitic-acid-binding-ft-ir-spectroscopic-study
#3
Adam Oleszko, Jadwiga Hartwich, Marlena Gąsior-Głogowska, Sylwia Olsztyńska-Janus
PURPOSE: Albumin is an universal transport protein. Plasma pool of free fatty acids arising from triglyceride hydrolysis, critical in energy metabolism and etiology of metabolic disorders is transported by albumin. According to various studies albumin has from seven to nine binding sites with diverse affinity to long chain fatty acids. X-ray diffraction crystallography measurements have provided data only for pure human serum albumin or albumin with fully saturated binding sites. These results have shown that amount of -helices is higher after fatty acids binding...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658531/preliminary-assessment-of-vibration-impacts-generated-by-the-public-transport-systems-on-pregnant-women-based-on-subjective-reactions
#4
Magdalena Kromka-Szydek, Zygmunt Dziechciowski, Paulina Tyrpin
PURPOSE: Research efforts summarised in this study were a part of preliminary investigation to evaluate the impact of pregnant women's exposure to vibrations generated by public transport system when using. METHODS: The assessment of the problem and discomfort for pregnant women, caused by the public transportation is based on a questionnaire including questions relating to the women's subjective feelings on well-being or discomfort when exposed to vibration during the ride in passenger cars or when using means of public transport...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658530/the-comparative-study-of-influence-of-lactic-and-glycolic-acids-copolymers-type-on-properties-of-daunorubicin-loaded-nanoparticles-and-drug-release
#5
Elena Nikolskaya, Mariya Sokol, Mariya Faustova, Olga Zhunina, Murad Mollaev, Nikita Yabbarov, Oksana Tereshchenko, Roman Popov, Eugen Severin
PURPOSE: The aim of this study was to compare the physico-chemical and biological properties of polymeric nanoparticles obtained from poly(DL-lactide-co-glycolide) (PLGA) with different ratios of monomers loaded with daunorubicin (DNR). METHODS: DNR-loaded nanoparticles (NPs) were prepared with use of modified simultaneous double-emulsion solvent evaporation/diffusion technique. NPs were characterized using dynamic light scattering, atomic force microscopy, transmission electron microscopy, scanning electron microscopy, and differential scanning calorimetry and Fourier transform infrared spectroscopy...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658529/the-effect-of-trabecular-bone-storage-method-on-its-elastic-properties
#6
Adam Mazurkiewicz
PURPOSE: The purpose of the study was to evaluate the effects of different methods of trabecular bone storage on changes in its elastic properties. METHODS: 186 porcine trabecular bone samples were divided into 6 groups, approximately 30 samples each. Five groups were stored using the following methods: in buffered 10% formalin solution at room temperature, frozen at -21 C, in the open air at room temperature, in 96% alcohol solution and in 50% alcohol solution at room temperature...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658528/gait-changes-in-patients-after-reconstruction-of-facial-bones-with-fibula-and-iliac-crest-free-vascularized-flaps
#7
Małgorzata Syczewska, Romuald Krajewski, Monika Kirwil, Ewa Szczerbik, Małgorzata Kalinowska
PURPOSE: Patients with malignant tumours of the oral cavity require its surgical removal and reconstruction of the bone and soft tissues. The grafts are obtained either from leg (fibula) or pelvis (iliac crest). The removal of grafts from the locomotor apparatus can impair the gait. The aim of this study was to find out how the localization of donor site influences the gait pattern. METHODS: Results obtained for 30 patients were analyzed (16 fibula graft, 14 iliac crest graft)...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658527/the-differences-between-overground-and-treadmill-walking-in-nonlinear-entropy-based-and-frequency-variables-derived-from-accelerometers-in-young-and-older-women-preliminary-report
#8
Lucia Bizovska, Zdenek Svoboda, Eliska Kubonova, Nicolas Vuillerme, Zuzana Hirjakova, Miroslav Janura
PURPOSE: The aim of this study was to compare gait stability and variability between walking conditions and age groups. METHODS: Twenty-six healthy younger and older females participated. Trunk acceleration in the vertical (V), medial-lateral (ML) and anteriorposterior (AP) directions during 5 minutes walking overground and 3 minutes walking on the treadmill at self-selected speed were recorded. Root mean square and standard deviations of acceleration, stride time and its variability, Lyapunov exponents (LE), multiscale entropy (MSE) and harmonic ratios (HR) were computed...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658526/curve-fitting-problem-torque-velocity-relationship-with-polynomials-and-boltzmann-sigmoid-functions
#9
Peter Milanov, Gergana Koroleova, Radoslav Mavrevski, Nevena Pencheva
PURPOSE: The aim of this study was to investigate the curve fitting and model selection problem of the torque-velocity relationship of elbow flexors and extensors in untrained females. The second goal was to determine the optimal models in different function classes and the best, among the optimal ones. Lastly, test the best models to predict the torque were tested. METHODS: Using the polynomials (second - fourth degree) and Boltzmann sigmoid functions, and a different presentation of data points (averages, a point cloud, etc...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658525/countermovement-depth-a-variable-which-clarifies-the-relationship-between-the-maximum-power-output-and-height-of-a-vertical-jump
#10
Jan Gajewski, Radosław Michalski, Krzysztof Buśko, Joanna Mazur-Różycka, Zbigniew Staniak
PURPOSE: The aim of this study was to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. METHODS: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861 ± 0.109 m, body weight 80.3 ± 9.2 kg). Each participant performed three jump tests: countermovement jump (CMJ), akimbo countermovement jump (ACMJ), and spike jump (SPJ)...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658524/reference-values-of-spatiotemporal-parameters-joint-angles-ground-reaction-forces-and-plantar-pressure-distribution-during-normal-gait-in-young-women
#11
Anna Fryzowicz, Michał Murawa, Jarosław Kabaciński, Agata Rzepnicka, Lechosław B Dworak
PURPOSE: The aim of this study was to establish the reference values of spatiotemporal parameters, joint angles, ground reaction forces and plantar pressure distribution collected simultaneously on the same measurement path during normal gait in a homogenous group of young, healthy women. METHODS: The studied group consisted of 28 healthy women aged 21 years on average. The motion capture system BTS Smart-D, 2 AMTI force platforms and Footscan pedobarographic platform were used in this research...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658523/determination-of-electrophysical-and-structural-properties-of-human-cancellous-bone-and-synthetic-bone-substitute-material-using-impedance-spectroscopy-and-x-ray-powder-diffraction
#12
Yvonne Haba, Martin Köckerling, Christoph Schick, Wolfram Mittelmeier, Rainer Bader
Electrophysical stimulation is used to support fracture healing and bone regeneration. For design optimization of electrostimulative implants, in combination with applied human donor bone or synthetic bone scaffolds, the knowledge of electrophysical properties is fundamental. Hence further investigations of the structural properties of native and synthetic bone is of high interest to improve biofunctionality of bone scaffolds and subsequent healing of the bone defect. The investigation of these properties was taken as an objective of this study...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658522/effects-of-anthropometric-factors-on-postural-stability-in-individuals-with-hearing-impairment
#13
Agnieszka Zdrodowska, Ida Wiszomirska, Katarzyna Kaczmarczyk, Andrzej Kosmol
PURPOSE: Identification of factors that affect postural stability may help to improve diagnostic accuracy and enhance the quality of treatment and rehabilitation. This study sought to assess the relationship between postural stability parameters and anthropometric factors of persons with hearing impairment (HI). METHODS: The study included 128 individuals - 42 subjects with HI and 86 without HI (healthy controls). Research methodology included an interview and a medical examination, anthropometric measurements and stabilometric tests on platforms with stable and unstable surfaces...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658521/ratios-of-torques-of-antagonist-muscle-groups-in-female-soccer-players
#14
Artur Struzik, Adam Siemieński, Tadeusz Bober, Bogdan Pietraszewski
PURPOSE: An increase in the value of the hamstring-to-quadriceps (H/Q) ratio with an increase in angular velocity may effectively prevent injuries of the back of the thigh. Previous studies have found that the conventional H/Q ratio was unaltered along with an increasing angular velocity in females. Therefore, this study aimed to investigate the relationships between the conventional H/Q ratio and angular velocity in a group of female soccer players. METHODS: The study was carried out on a group of 16 female soccer players (age: 20...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658520/biomechanical-characterization-of-slope-walking-using-musculoskeletal-model-simulation
#15
Masayuki Kawada, Kazutaka Hata, Ryoji Kiyama, Tetsuo Maeda, Kazunori Yone
PURPOSE: Upslope and downslope walking are basic activities necessary for normal daily living in community, and they impose greater joint load on the lower extremities than during level walking. Thus, the purpose of this study was to quantify the resultant and shear forces in the hip and knee joints during slope walking. METHODS: Twelve healthy volunteers were evaluated when walking under level and 10° up- and downslope conditions. Three-dimensional gait analysis was conducted using a 7-camera optoelectronic motion analysis system combined with a force plate to measure ground reactive force...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658519/biomechanical-evaluation-of-tendon-connection-with-novel-suture-techniques
#16
Zhe Chen, Jun Wang, Jia-Sen Wei, Zhao-Yang Hou, Min Li, Qi-Xin Chen
PURPOSE: Achilles tendon rupture is a severe injury with poor curative effect due to its anatomical characteristic and mechanical peculiarity. Internal fixation of limited loop (IFLL) with steel-wire has been applied on patients with tendon rupture to fix the broken ends before physical rehabilitation. The purpose of this study is to investigate the biomechanical property and radiological characteristic of such suture technique for the repairment of tendon rupture. METHODS: Tendons of pigs' hint feet were separated for the biomechanical study...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658518/stabilometric-indicators-as-an-element-of-verifying-rehabilitation-of-patients-before-and-after-reconstruction-of-anterior-cruciate-ligament
#17
Katarzyna Ogrodzka-Ciechanowicz, Dorota Czechowska, Wiesław Chwała, Jakub Ślusarski, Artur Gądek
PURPOSE: The aim of the study was to evaluate effectiveness of rehabilitation in patients before and after rACL, based on stabilographic indicators. METHODS: The research group was comprised of 31 men aged 20-57 with anterior cruciate ligament injury, qualified for reconstruction surgery. A measurement of static stabilometric indicators and muscle strength was taken twice for each patient - before surgery and after 6 months. To assess stabilographic indicators the stabilographic platform was used and to asses muscle strength a dynamometer was used...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658517/balance-disturbances-coefficient-as-a-new-value-to-assess-ability-to-maintain-balance-on-the-basis-of-fft-curves
#18
Jacek Jurkojć
PURPOSE: The aim of this study was to formulate a new balance disturbances coefficient enabling objective balance assessment on the basis of fast Fourier transform curves. The article presents the method of coefficient calculation and possible ways of its interpretation. METHODS: 11 healthy participants took part in the experiment. There were four measurements: two in real environment with eyes open and eyes closed as well as two in virtual environment with scenery (surroundings) oscillating with frequency 0...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658516/optimization-of-differentiation-time-of-mesenchymal-stem-cell-to-tenocyte-under-a-cyclic-stretching-with-a-microgrooved-culture-membrane-and-selected-measurement-cells
#19
Yasuyuki Morita, Takahiro Yamashita, Toku Toku, Yang Ju
PURPOSE: There is a need for efficient stem cell-to-tenocyte differentiation techniques for tendon tissue engineering. More than 1 week is required for tenogenic differentiation with chemical stimuli, including co-culturing. Research has begun to examine the utility of mechanical stimuli, which reduces the differentiation time to several days. However, the precise length of time required to differentiate human bone marrow-derived mesenchymal stem cells (hBMSCs) into tenocytes has not been clarified...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658515/assessment-of-corneal-and-fatty-tissues-biomechanical-response-in-dynamic-tonometry-tests-by-using-inverse-models
#20
Mohammad Jannesari, Mahmoud Kadkhodaei, Peiman Mosaddegh, Henryk Kasprzak, Mahmoud Jabbarvand Behrouz
PURPOSE: The assessment of corneal biomechanics is essential for studying ophthalmological operations, such as refractive surgeries, and for more accurate estimation of intraocular pressure. The chief aim of the current study is to characterize corneal and fatty tissues in order to construct a model to predict eye globe behavior during dynamic tonometry tests. METHODS: In the present study, images from corneal deformation, acquired from Corvis ST tonometer, were processed...
2018: Acta of Bioengineering and Biomechanics
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