737 results match your criteria Acta Of Bioengineering And Biomechanics[Journal]


Comparative biomechanical characteristics of one-arm hang in climbing for beginners and qualified athletes.

Acta Bioeng Biomech 2020 ;22(1):57-66

Department of Theoretical and Methodological Foundations of Physical Education and Rehabilitation, Donbas State Pedagogical University, Slavyansk, Ukraine.

Purpose: The aim of the study was to identify the basic kinematic characteristics of the one-arm hang in climbing for beginners and qualified climbers.

Material And Methods: Technique of the one-arm hang in climbing among 20 leading climbers of the World and Ukraine and 20 beginner male amateur climbers was analyzed. A qualified athlete participated in the demonstration of various models of the one-arm hang performance. Read More

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January 2020

Asymmetry of lower limb strength and jumping ability of young soccer players.

Acta Bioeng Biomech 2020 ;22(1):79-85

University School of Physical Education in Wrocław, Department of Biomechanics, Wrocław, Poland.

Purpose: The aim of this study was to evaluate the potential correlation between asymmetry of lower limb muscle torque, asymmetry of vertical ground reaction force during take-off in young soccer players and their jumping abilities.

Methods: Twenty-three young soccer player (16.9 ± 0. Read More

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January 2020

Impact of footwear fitting on foot shape in primary schoolgirls.

Acta Bioeng Biomech 2020 ;22(1):119-126

University of Presov, Faculty of Health Care, Department of Physiotherapy, Slovakia.

Purpose: The study aimed to analyze the footwear fitting and its impact on foot construction features in primary schoolgirls.

Methods: The study group was comprised of 100 girls aged 9 years. The study relied on the CQ-ST podoscope and the Clevermess device for pertinent measurements. Read More

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January 2020

Muscle torque production and kinematic properties in post-stroke patients: a pilot cross-sectional study.

Acta Bioeng Biomech 2020 ;22(1):11-20

Department of Physiotherapy, Faculty of Health Sciences, Wroclaw Medical University, Wrocław, Poland.

Purpose: Stroke-related hemiplegia is an important factor influencing parameters of gait. So far, limited papers have assessed temporo- spatial capabilities and their correlations with gait parameters in the early post-stroke stage. This pilot study evaluated the temporospatial parameters of gait and assessed the maximal isometric and isokinetic torque production of the plantar flexor and dorsiflexor muscles. Read More

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January 2020

Postural stability and functional disorders in patients with loosened hip prosthesis.

Acta Bioeng Biomech 2020 ;22(1):41-46

Faculty of Psychology, University of Warsaw, Warsaw, Poland.

Purpose: The number of primary hip arthroplasties is growing every year. One of the most common long complications is the aseptic loosening of the prosthesis leading to serious complications in patients life, pain and following surgeries. In the literature, there is a lack of studies regarding balance impairment in this group of patients, which is why there was a need to conduct the study in order to find possible falling risk factors and simple functional, diagnostic test. Read More

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January 2020

The interaction of laser radiation with tissue in the aspect of generating the process of decellularization in the preparation of animal origin autologous tissue.

Acta Bioeng Biomech 2020 ;22(1):67-77

Jagiellonian University Medical College, Department of Medicine, Kraków, Poland.

Purpose: The aim of the work was to create an appropriate substrate for organ transplantation using bioactive tissue-based scaffold populated by cells of the graft recipient. The purpose of the modeling was to investigate the mechanical effects of wave loading of aortic and pulmonary tissue material.

Methods: The biological properties of tissues of aortic and pulmonary valves were modified by the process of decellularization. Read More

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January 2020

The relationship between sagittal spinal curvatures and isokinetic trunk muscle endurance after aquatic exercise training in survivors of breast cancer.

Acta Bioeng Biomech 2020 ;22(1):21-30

Department of Rehabilitation in Internal Diseases, Faculty of Physiotherapy, University School of Physical Education in Wrocław, Wrocław, Poland.

Purpose: Assessment of the impact of aquatic exercises on the relationship between sagittal spinal curvatures and isokinetic trunk muscle endurance against standard land exercises in women after breast cancer treatment.

Methods: 40 women post breast cancer divided into two groups: a study group (n = 20) participated in the aquatic exercises and a control group (n = 20) performed the land exercises. Data collection occurred both before and after the 8 week intervention. Read More

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January 2020

Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties.

Acta Bioeng Biomech 2020 ;22(1):165-177

Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.

Purpose: In this paper, electrochemical properties of the as-formed and thermally treated titanium dioxide (TiO2) nanotubes with diameter in the range of 20-100 nm and height in the range of 100-1000 nm were presented. In addition, the effects of annealing temperature (450-550 °C) on the electrochemical characteristics of these structures, as well as the influence of diameter and height of TiO2 nanotubes on these properties were examined. The results were referred to a compact TiO2 layer (100 nm thick). Read More

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January 2020

Assessment of gait stability and preferred walking speed in virtual reality.

Acta Bioeng Biomech 2020 ;22(1):127-134

Silesian University of Technology, Faculty of Biomedical Engineering, Department of Biomechatronics, Gliwice, Poland.

Purpose: Analysis of human gait as well as diagnosis of human locomotion organ should always be conducted with velocity of gait equal to Preferred Walking Speed (PWS). The literature review shows that the PWS value is not the same in real and virtual environment. The aim of this study was to determine PWS values in both environments and to specify values of parameters used in equations enabling PWS calculations on the basis of lower limb length. Read More

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January 2020

Assessment of dynamic balance during step initiation in Parkinson's disease patients and elderly - a validity study.

Acta Bioeng Biomech 2020 ;22(1):3-10

Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, Poland.

Purpose: The aim of this study was to evaluate the reliability of the novel posturographic procedure and to investigate the relationships between parameters of this procedure and clinical tests. We hypothesised the proposed step initiation procedure to be reliable method of balance and motor disability assessment, especially in patients with neurological deficits. Also, we assumed high significant correlation between parameters of step initiation procedures and clinical tests. Read More

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January 2020

Changes in the mechanical properties of femoral cartilage tissue in advanced osteoarthritis.

Acta Bioeng Biomech 2020 ;22(1):143-152

Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Wrocław, Poland.

Purpose: The main goal of this article was the analysis of the changes of mechanical properties, thickness and histology of the cartilage in different regions of the femur head in advanced stage of the osteoarthritis.

Methods: The study material consisted of cylindrical specimens (9.7 mm) prepared form proximal epiphysis of the human femur bone after hip arthroplasty. Read More

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January 2020

Hybrid nanobiocomposites based on poly(3-hydroxybutyrate) - characterization, thermal and mechanical properties.

Acta Bioeng Biomech 2020 ;22(1):97-110

Centre of Polymer Systems, Tomas Bata University in Zlin, Czech Republic.

Poly(3-hydroxybutyrate) is a biopolymer used to production of implants in the human body. On the other hand, the physical and mechanical properties of poly(3-hydroxybutyrate) are compared to the properties of isotactic polypropylene what makes poly(3-hydroxybutyrate) possible substitute for polypropylene. Unfortunately, the melting point of poly(3-hydroxybutyrate) is almost equal to its degradation temperature what gives very narrow window of its processing conditions. Read More

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January 2020

Rib kinematics analysis in oblique and lateral impact tests.

Acta Bioeng Biomech 2020 ;22(1):135-141

Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Warsaw, Poland.

Purpose: Understanding thorax kinematics and rib breaking mechanisms in conditions of oblique and lateral impact is crucial in safety systems development. To increase knowledge level on this subject, simulation and experimental tests are necessary. The purpose of this study was to obtain single rib kinematics in the case of oblique and lateral impact conditions using numerical simulation approach. Read More

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January 2020

Evaluation of stabilization of intra-articular fracture of distal humerus - finite element study.

Acta Bioeng Biomech 2020 ;22(1):153-163

Department of Traumatology and Orthopaedics, Military Institute of Medicine, Warsaw, Poland.

Purpose: The treatment of comminuted fractures of distal humerus poses a challenge for orthopaedics. Previous studies assessing the global stiffness of the bone - stabilizer system - made it impossible to explicitly indicate an optimal configuration of the locking plates in the treatment of this kind of fractures. The aim of the present research was to comparatively analyze the stabilization conditions of intraarticular fractures of distal humerus with the use of various configurations of the stabilizer. Read More

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January 2020

Body balance a few years after total hip replacement.

Acta Bioeng Biomech 2020 ;22(1):87-96

Department of Rehabilitation, Poznan University of Medical Sciences, Poznań, Poland.

Purpose: These aim of the study was to conduct a long-term evaluation of whether total hip replacement permanently affects the dynamic body balance.

Methods: Twenty-five patients after the unilateral total hip replacement (mean age: 69.9 ± 6. Read More

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January 2020

Investigation of mechanical and physicochemical properties of clinically retrieved titanium-niobium orthodontic archwires.

Acta Bioeng Biomech 2020 ;22(1):31-39

Institute of Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Purpose: Most of the orthodontic archwires used in the clinical practice nowadays contain nickel (Ni), however, many patients, especially kids, are allergic to Ni. One possible Ni-free alternative is the Titanium-Niobium (Ti-Nb) archwire. Unfortunately, there is not enough information about its mechanical properties in the literature, especially after clinical usage. Read More

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January 2020

Biomechanical evaluation of swing-through crutch gait in patients with lower extremity injury.

Acta Bioeng Biomech 2020 ;22(1):111-117

The President Stanisław Wojciechowski State University of Applied Sciences in Kalisz, Kalisz, Poland.

Purpose: The main purpose was to determine the values of spatio-temporal parameters and ground reaction forces during the swingthrough crutch gait.

Methods: Eighteen male patients with unilateral injury within the foot, ankle or shank (age: 25.4 ± 7. Read More

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January 2020

Comparative study on physicochemical properties of alpha-TCP / calcium sulphate dihydrate biomicroconcretes containing chitosan, sodium alginate or methylcellulose.

Acta Bioeng Biomech 2020 ;22(1):47-56

Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Krakow, Poland.

Purpose: Recently, the attention has been drawn to complex systems - biomicroconcretes composed of a bone cement matrix and resorbable granules or microspheres. This paper presents novel bone substitutes composed of α-tricalcium phosphate (α-TCP; cement matrix), calcium sulphate dihydrate granules (GCSD; aggregates in biomicroconcrete) and various polymers (chitosan, sodium alginate, methylcellulose) used for the improvement of material properties. The aim of this work was to study α-TCP-GCSD-polymer interactions and to compare the impact of organic additives on the physicochemical properties of biomicroconcretes. Read More

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January 2020

Is it possible to reduce loads of the locomotor system during the landing phase of dance figures? Biomechanical analysis of the landing phase in Grand Jeté, Entrelacé and Ballonné.

Acta Bioeng Biomech 2019 ;21(4):111-121

Department of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, Zabrze, Poland.

Purpose: The objective of the work was to determine biomechanical parameters influencing loads affecting the musculoskeletal system and shock absorption during the landing phase in Grand Jeté, Entrelacé and Ballonné.

Methods: Motion kinematics measurements of the landing phase in GrandJeté, Entrelacé and Ballonné were carried out using the optical APAS system, and measurements of the GRF components - using Kistler platform. The research was carried out for three professional dancers. Read More

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Alteration of the multi-segment foot motion during gait in individuals with plantar fasciitis: a matched case-control study.

Acta Bioeng Biomech 2019 ;21(4):73-82

Discipline of Exercise and Sport Science, Faculty of Health Science, The University of Sydney, Australia.

Purpose: The objective of this study was to compare the ground reaction forces (GRFs) and the multi-segment foot motion between individuals with plantar fasciitis (PF) and healthy controls.

Methods: Twenty-one individuals with PF and 21 matched-case healthy controls who passed the criteria participated in the study. Gait data were assessed during their self-selected comfortable speeds by the 3D motion analysis system. Read More

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Comparison of static and dynamic methods based on knee kinematics to determine optimal saddle height in cycling.

Acta Bioeng Biomech 2019 ;21(4):93-99

Laboratory of Performance, Health, Metrology, and Society, University of Reims Champagne-Ardenne, Reims, France.

Purpose: Bike-fitting methods based on knee kinematics have been proposed to determine optimal saddle height. The Holmes method recommends that knee angle be between 25° and 35° when the pedal is at bottom dead centre in static. Other authors advocate knee angle of 30-40° during maximum knee extension while pedalling. Read More

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The relationship between body composition and foot posture index in Special Olympics athletes.

Acta Bioeng Biomech 2019 ;21(4):47-52

Faculty of Sports Studies, Masaryk University, Brno, Czech Republic.

Purpose: In Special Olympics, athletes' foot deformities, abnormal postural patterns and overweight and obesity were observed to be more common than in the general population. Therefore, the purpose of this study was to analyze the relationship between body composition and foot posture index. Additionally, the effect of gender and other factors on the body composition and foot posture index in athletes with intellectual disability (ID) were analyzed. Read More

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Do different muscle strength levels affect stability during unplanned gait termination?

Acta Bioeng Biomech 2019 ;21(4):27-35

Faculty of Sports Science, Ningbo University, Ningbo, China.

Purpose: Unplanned gait termination (UGT) widely occurs in various sports and daily life as a kind of stress response to unexpected stimulus. However, the body stability may be greatly affected when the body completely stops. The purpose of this study was to examine the association between muscle strength levels and body stability during UGT through comparing the plantar pressure. Read More

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Anthropometric and strength profiles of professional handball players in relation to their playing position - multivariate analysis.

Acta Bioeng Biomech 2019 ;21(4):147-155

University School of Physical Education in Wrocław, Faculty of Sports Science, Physical Anthropology Unit Wrocław, Poland.

Purpose: In team sports, the varied levels of physical demand associated with different field positions are reflected in the morphofunctional features of the players. The aim of this work was to recognize how the playing position in the team depends on the anthropometric profiles and the strength level of professional handball players.

Methods: A body mass, stature, lower and upper extremity length, circumferences and skinfolds were measured in the male professional athletes. Read More

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Acute effects of different orthoses on lower extremity kinetics and kinematics during running; a musculoskeletal simulation analysis.

Acta Bioeng Biomech 2019 ;21(4):13-25

School of Life Science and Education, Staffordshire University.

Purpose: The current investigation aimed to examine the effects of different orthotic conditions on the biomechanical mechanisms linked to the aetiology of chronic pathologies using musculoskeletal simulation.

Methods: 16 male and 20 females ran over an embedded force plate at 4.0 m/s, in five different conditions (medial, lateral, no-orthoses, semi-custom and off the shelf). Read More

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Gender effect on underwater undulatory swimming technique of young competitive swimmers.

Acta Bioeng Biomech 2019 ;21(4):3-11

Department of Anthropology, Institute of Biomedical Sciences, University of Physical Education in Kraków, Poland.

Purpose: The study aim was determining gender-related differences of underwater undulatory swimming (UUS) kinematic indicators and their impact on UUS velocity.

Methods: The study included 18 girls (F: age 16.71 ± 0. Read More

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3D printed Polylactid Acid based porous scaffold for bone tissue engineering: an in vitro study.

Acta Bioeng Biomech 2019 ;21(4):101-110

Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University in Bratislava, Slovakia.

Purpose: The objective of this study was to fabricate PLA-based porous scaffold by 3D printing technology and to evaluate their cytotoxicity and biocompatibility under in vitro conditions in respect to bone tissue engineering.

Material And Methods: Pure PLA in filamentous form was processed via 3D printing technology of fused filament fabrication into porous scaffolds. The structure and porosity of scaffolds were measured by metrotomography. Read More

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Age-related differences in the symmetry of electromyographic activity and muscle force in lower limbs.

Authors:
Agnieszka Szpala

Acta Bioeng Biomech 2019 ;21(4):139-146

Department of Biomechanics, University School of Physical Education in Wrocław, Poland.

Purpose: Increased reaction time and asymmetrical force generation in muscles may elevate the risk of falling among seniors. Therefore, it seems useful to analyze the symmetry of strength and amplitude parameters that evaluate neuromuscular control. The aim of the study was to evaluate force parameters for the quadriceps and biceps femoris muscles in young and older women performing maximal voluntary contraction. Read More

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Biodegradable polymer coatings on Ti6Al7Nb alloy.

Acta Bioeng Biomech 2019 ;21(4):83-92

Centre of Polymer and Carbon Materials of the Polish Academy of Sciences Zabrze, Poland.

The aim of the study was to determine the influence of long term exposure to Ringer's solution of biodegradable polymer coatings containing an active substance on the Ti6Al7Nb alloy substrate on the physical and chemical properties of the coatings and the degradation process of the metal substrate. The studies used poly(L-lactide-co-trimethylene carbonate) P(L/TMC), poly(L-lactide-co-trimethylene carbonate-glycolide) P(L/TMC/G) and poly(D,L-lactide-glycolide) (PLGA) coatings applied to the anodically oxidized Ti6Al7Nb alloy by means of dipping method (1, 2 and 3 dips). The polymer coatings contained ciprofloxacin. Read More

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Bilateral dentoalveolar asymmetries in female patients with adolescent idiopathic scoliosis.

Acta Bioeng Biomech 2019 ;21(4):53-62

Department of General Orthopedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznań, Poland.

Purpose: The aim of this cross-sectional research was to quantify left-right dentoalveolar fluctuating (FA) and directional asymmetries (DA) in patients with adolescent idiopathic scoliosis and to assess the relationship between these asymmetries and the side, location, and severity of scoliosis.

Materials And Methods: The study group comprised of 60 females aged 12-16 years, with idiopathic scoliosis, and 54 healthy controls. Measurements were made with the use of digital caliper on full-mouth dental casts. Read More

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Development of manufacturing method of the MAP21 magnesium alloy prepared by selective laser melting (SLM).

Acta Bioeng Biomech 2019 ;21(4):157-168

Centre for Advanced Manufacturing Technologies - Fraunhofer Project Center, Wrocław University of Science and Technology, Wrocław, Poland.

Magnesium alloys are well known for their biocompatibility and biodegradable properties [9], [27] owing to the fact that magnesium is a mineral crucial for human body, especially for bone tissue. There are studies [17] on using WE43 additively manufactured magnesium scaffolds for full bone and soft tissue regeneration. Moreover, magnesium implants in bones were investigated as having higher bone-implant interface strength than titanium ones [3]. Read More

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The effect of decontamination procedures on elastic polymeric materials used in dental mouthguards fabrication.

Acta Bioeng Biomech 2019 ;21(4):63-71

Department of Prosthodontics, Medical University of Warsaw, Warsaw, Poland.

Purpose: Mouthguards are commonly used in the prevention of head and mouth injuries in many sport disciplines. Elastic polymeric materials used in their fabrication absorb the energy of impact. However, decontamination procedures may cause damage to their surface causing deterioration of their properties and favouring pathogen colonization. Read More

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Analysis of the electrolytically polished skeletal dentures surfaces using various nano- and microscopic technologies.

Acta Bioeng Biomech 2019 ;21(4):123-129

Faculty of Microsystem Electronics and Photonics, Wrocław University of Science and Technology, Wrocław, Poland.

Purpose: The surface roughness of the dental restorations is significant to the denture plaque adhesion.

Methods: In this work, we present the complex analysis of the electropolished CoCrW alloy remanium® star (Dentaurum, Germany) samples with laserengraved fiducial marks performed using complementary set of micro- and nanoscopic techniques: optical profilometry (OP), atomic force microscopy (AFM), scanning electron microscopy (SEM) and focused ion beam (FIB) milling.

Results: Both mean and RMS roughness of the samples were reduced by electopolishing process, however, the results obtained using OP and AFM exhibited some discrepancies. Read More

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Movement variability response to change in the rate of hopping.

Acta Bioeng Biomech 2019 ;21(4):37-45

Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA.

Movement variability is often considered undesirable, but growing evidence demonstrates positive aspects of variability. During unipedal hopping, control of limb stiffness and limb length are paramount.

Purpose: The purpose of this study was to compare two methods of measuring movement variability that provide information at the task level, and their capacities to illuminate the neuromotor control system's response to change in hopping rate. Read More

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Temporal and dynamic changes in plantar pressure distribution, as well as in posture during slow walking in flat and high-heel shoes.

Acta Bioeng Biomech 2019 ;21(4):131-138

University of Prešov in Prešov, Faculty of Health Care, Department of Physiotherapy, Prešov, Slovakia.

Purpose: The aim of the study was to assess the differences in plantar pressure distribution and in posture during slow and very slow walking on the treadmill in flat and high-heeled shoes.

Methods: The Pedar-X® (Novel, Munich, Germany) measuring insoles were used to measure the plantar pressure distribution and to assess temporal parameters during walking on the treadmill with the speed v1 = 0.97 ms-1 and v2 = 0. Read More

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Sensitivity study on seat belt system key factors in terms of disabled driver behavior during frontal crash.

Acta Bioeng Biomech 2019 ;21(4):169-180

Military University of Technology, Faculty of Mechanical Engineering, Warsaw, Poland.

Purpose: Each year, many cars (in Poland approximately three hundred) are adopted for disabled driver, to enable them to drive the car independently. The purpose of the paper is to assess the key factors which significantly influence the disabled driver behavior during a frontal crash and have the biggest impact on the safety factors.

Methods: To achieve the purpose of the paper, the finite element method was used. Read More

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Mechanical guidelines on the properties of human healthy arteries in the design and fabrication of vascular grafts: experimental tests and quasi-linear viscoelastic model.

Acta Bioeng Biomech 2019 ;21(3):13-21

Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

Purpose: Knowledge of mechanical behavior of healthy human arteries as the guidelines to target properties of vascular grafts deserves special attention. There is a lack of mathematical model to characterize mechanical behavior of biomaterial while many mathematical models to reflect mechanics of human arteries have been proposed. The objective of this paper was set to measure mechanical properties of healthy human arteries including Common Carotid Artery (CCA), Abdominal Aorta Artery (AAA), Subclavian Artery (SA), Common Iliac Artery (CIA) and Right and Left Iliac Artery (RIA and LIA) and compare them to those of commercial ePTFE and Dacron®. Read More

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Disbalance and fatigue of the spinal extensors as one of the causes of the overload disease of the lumbar spine.

Acta Bioeng Biomech 2019 ;21(3):119-125

Department of Physiotherapy, Faculty of Health Sciences, Jagiellonian University Medical College, Kraków, Poland.

Purpose: The aim of the study was to find out whether among young active people - the future healthcare professionals - there is a risk of developing lumbar spine overload disease depending on the occurrence of the disbalance of paravertebral muscles and to assess the fatigue of the examined muscles depending on the body position during the work.

Methods: The study involved 50 randomly selected students of physiotherapy and emergency medical services of a mean age of 21 years. The surface electromyography (sEMG) was used to measure the activity level of spinal extensors of the cervical and lumbar spine. Read More

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Measurement of maximal isometric torque and muscle fatigue index of the knee muscles in male athletes.

Acta Bioeng Biomech 2019 ;21(3):31-37

Institute of Physical Education, Kazimierz Wielki University, Bydgoszcz, Poland.

Purpose: The aim of the paper was to analyse variables related to the force and fatigue of knee muscles in the right and left lower limbs among 17 male athletes.

Methods: For both muscle groups, maximal isometric torque (Fmax) was determined with the use of Biodex System 4 Pro and the values of muscle fatigue index (FATI1-3) were calculated.

Results: A significant difference was observed between the groups of short- and long-distance runners in the values of all fatigue indices of knee joint extensor muscles in the right limb. Read More

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Electron beam sterilization of implantable rods with risperidone and with 17-β-estradiol: a structural, thermal and morphology study.

Acta Bioeng Biomech 2019 ;21(3):39-47

School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Chair and Department of Biopharmacy, Sosnowiec, Poland.

Purpose: Poly(L-lactide-co-glycolide-co-trimethylene carbonate) rods with risperidone and 17-β-estradiol were sterilized by electron beam irradiation. The aim of the study was to assess electron beam irradiation impact on terpolymer composition, chain microstructure, glass transition temperature, molecular weight and the morphological features of rods.

Methods: Hot melt extrusion in the formulation of rods was applied. Read More

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Analysis of fatigue loads of the knee joint during gait.

Acta Bioeng Biomech 2019 ;21(3):159-167

University of Life Sciences in Lublin, Poland.

Purpose: The aim of the work was to show that the fatigue load of bone tissue causes permanent structural changes in it.

Methods: On the basis of the movie recording of gait, the time courses of angular changes in the joints of the lower limb were determined. Using the method of transforming Denavit-Hartenberg coordinate systems, the course of force loading the hip joint and, after that, the course of normal contact reaction of the femoral head of the knee joint during gait for the support phase were determined. Read More

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Assessment of distribution of plantar pressures and foot characteristics during walking in pregnant women.

Acta Bioeng Biomech 2019 ;21(3):49-56

Faculty of Sports Studies, Masaryk University, Brno, Czech Republic.

Purpose: The main purpose of this research was to analyse the distribution of plantar pressures and foot characteristics during walking between weeks 27 and 36 of pregnancy. The secondary purpose was to test the effect of the customized orthopaedic shoes that were worn by the experimental group.

Methods: Pregnant women (n = 73) were divided into 2 groups, control group (n = 38) and experimental group (n = 35) which completed 5 gait trials on a walkway (1. Read More

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Bone conduction stimulation of the otic capsule: a finite element model of the temporal bone.

Acta Bioeng Biomech 2019 ;21(3):75-86

Lazarski University, Medical Faculty, Warsaw, Poland.

Purpose: Bone conduction stimulation applied on the otic capsule may be used in a conductive hearing loss treatment as an alternative to the bone conduction implants in clinical practice. A finite element study was used to evaluate the force amplitude and direction needed for the stimulation.

Methods: A finite element model of a female temporal bone with a precisely reconstructed cochlea was subjected to a harmonic analysis assuming two types of stimulation. Read More

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Effect of sound on standing postural stability in the elderly with and without knee osteoarthritis.

Acta Bioeng Biomech 2019 ;21(3):99-108

Faculty of Physical Therapy, Mahidol University, Nakhon Pathom, Thailand.

Purpose: The aim of the study was to investigate the influence of sound on standing postural control in the elderly with and without knee osteoarthritis (knee-OA).

Methods: Twenty-six elderly with knee-OA and 26 elderly without knee-OA who matched the age and height participated in this study. The standing postural stability was assessed by the 3D motion analysis system. Read More

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Inferring material properties in robotic bone drilling processes.

Acta Bioeng Biomech 2019 ;21(3):109-118

CEIT, Materials and Manufacturing Division, San Sebastián, Spain.

Purpose: Recent innovations in robotics have enabled the development of automatic bone drilling tools which allows surgeons to improve the precision of their surgical operations. However, these tools still lack valuable tactile information about the material properties of the bone, preventing surgeons from making decisions while operating. The aim of this work is to explore whether robotic drilling tools can infer bone condition on the basis of certain key measures, particularly thrust force. Read More

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A prospective longitudinal comparison of the sacral inclination angle in women between their early and advanced pregnancy and 6-month postpartum follow-up.

Acta Bioeng Biomech 2019 ;21(3):127-134

Motion Analysis Laboratory, Department of Physiotherapy, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland.

Purpose: The impact of pregnancy on the anterior-posterior sacral orientation and its relation to lumbopelvic pain and weight gain has not been fully recognized. This longitudinal study aimed to compare the sacral inclination angle in women between their early and advanced pregnancy and at 6 months postpartum. The authors also searched for a correlation between the sacral inclination and lumbopelvic pain, BMI and change in body mass. Read More

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Variability of shoulder girdle temperature in the initial phase of the snatch in weightlifting.

Acta Bioeng Biomech 2019 ;21(3):143-148

Józef Piłsudski University of Physical Education, Faculty of Physical Education and Sport, Department of Theory and Technology of Sports Training, Biała Podlaska, Poland.

Purpose: The identification of activation, synchronization and work of individual muscles in the subsequent stages of lifting weights is interesting for researchers and trainers. Unfortunately, the existing methods of research do not provide such possibilities. Such information could be gathered from infrared measurements as they are non-invasive and can be carried out without the direct involvement of the weightlifter. Read More

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Thermographic evaluation of experimental pleurisy induced by carrageenan and modified by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).

Acta Bioeng Biomech 2019 ;21(3):23-29

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland.

Purpose: The use of a thermal imaging camera may improve the detection of changes during inflammation process propagation in animals and humans that could be caused by numerous factors like 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).

Methods: Rats were randomised and divided into two groups, C group, in which experimental pleural inflammatory reaction was evoked and TCDD group, in which a single dose was applied 21 days before administration of 1% carrageenan solution. Infrared thermograms were taken with a microbolometer thermal imaging camera MobIR M8. Read More

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Photogrammetric evaluation of body posture of 6-year-old boys training judo, in three repeated assessments.

Acta Bioeng Biomech 2019 ;21(3):149-157

University of Physical Education, Kraków, Poland.

Purpose: The purpose of this work was to assess changes in body posture in a group of 6-year-old boys training judo, compared to a control group, in three repeated examinations.

Methods: The study included 88 boys aged 6. Fifty-one of them started judo training in sports clubs at the beginning of the school year (JU). Read More

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Physiological parameters analysis of transfemoral amputees with different prosthetic knees.

Acta Bioeng Biomech 2019 ;21(3):135-142

Rehabilitation Engineering and Technology Institute, University of Shanghai for Science and Technology, Shanghai, China.

Purposeː Physiological parameters analysis allows for a precise quantification of energy expenditure of transfemoral amputees with different prosthetic knees. Comparative physiological parameters analysis that indicate the functional characteristics of knee joints is essential to the choice of transfemoral amputee. The aim of this study was to propose a microprocessor-controlled prosthetic knee (i-KNEE) and conducted physiological parameters (energy cost, gait efficiency and relative exercise intensity) comparison of transfemoral amputees with C-leg, Rheo Knee and Mauch under different walking speeds. Read More

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