Read by QxMD icon Read

Acta of Bioengineering and Biomechanics

Sarah Hensley, Mackenzie Christensen, Scott Small, Derek Archer, Emily Lakes, Renee Rogge
PURPOSE: Previous biomechanical studies have estimated the strains of bone and bone substitutes using strain gages. However, applying strain gages to biological samples can be difficult, and data collection is limited to a small area under the strain gage. The purpose of this study was to compare digital image correlation (DIC) strain measurements to those obtained from strain gages in order to assess the applicability of DIC technology to common biomechanical testing scenarios. METHODS: Compression and bending tests were conducted on aluminum alloy, polyurethane foam, and laminated polyurethane foam specimens...
2017: Acta of Bioengineering and Biomechanics
Joseph Bascou, Christophe Sauret, Francois Lavaste, Hélène Pillet
PURPOSE: Among the different resistances occurring during wheelchair locomotion and that limit the user autonomy, bearing resistance is generally neglected, based on a few studies carried out in static conditions and by manufacturer's assertion. Therefore, no special attention is generally paid to the mounting and the maintenance of manual wheelchair bearings. However, the effect of inadequate mounting or maintenance on wheelchair bearing resistance has still to be clarified. This study aimed at filling this gap by developing and validating a specific device allowing the measurement of wheelchair bearing friction, characterized by low speed velocities, with an accuracy lower than 0...
2017: Acta of Bioengineering and Biomechanics
Adam Czaplicki, Wiesława Kuniszyk-Jóźkowiak, Janusz Jaszczuk, Marta Jarocka, Jacek Walawski
PURPOSE: The purpose of the current study was to assess the effectiveness of rehabilitation in patients after anterior cruciate ligament reconstruction (ACLR) using a wavelet analysis of the torque-time curve patterns of the extensors of the affected knee. The analysis aimed at the quantitative evaluation of irregularities in these torque-time patterns. METHODS: The study involved a group of 22 men who had had ACL reconstruction. The torque-time characteristics were recorded 3, 6 and 12 months after the surgery by an isokinetic dynamometer...
2017: Acta of Bioengineering and Biomechanics
Jacek Jurkojć, Piotr Wodarski, Andrzej Bieniek, Marek Gzik, Robert Michnik
PURPOSE: The aim of the study was to examine the influence of different types of virtual sceneries and frequencies of movement of visual disturbances on stabilometric values as well as whether individual sceneries and changing frequency can minimize effect of adaptation of tested person to applied disturbances. METHODS: There were 23 healthy participants. A person has been standing on a Zebris stabilometric platform. Virtual 3D environment was displayed by means of HMD Oculus Rift system...
2017: Acta of Bioengineering and Biomechanics
Sen Xiao, Jikuang Yang, Jeff R Crandall
PURPOSE: The purpose of this quantitative study is to investigate the differences of the injury mechanism caused by two different types of seatbelt loads on the occupant's chest. METHODS: The finite element analysis is employed to compare the different responses of the human body model, including comparison of kinematics, chest accelerations, seatbelt forces and chest injury outcomes regarding chest deflections and rib fractures. RESULTS: The calculated rib strain-stress response from simulations in force-limiting seatbelt are higher than that in the regular seatbelt...
2017: Acta of Bioengineering and Biomechanics
Adam Mazurkiewicz, Tomasz Topoliński
PURPOSE: The study aimed to investigate a relationship between the mineral content of human trabecular bone and parameters determined from compression fatigue tests at stepwise-increasing amplitude. METHODS: Mineral content of trabecular bone was estimated comparing density and bone mineral density values. The relationship between the ash density, bone mineral density and factors obtained from fatigue test: fatigue life, cumulative elastic energy and cumulative energy of dissipation was determined...
2017: Acta of Bioengineering and Biomechanics
Alexey Smoluk, Leonid Smoluk, Ruslan Lisin, Yuri Protsenko
Our work involved experimental study of the influence of actomyosin complexes and the main structural components of the myocardial tissue - connective tissue collagen framework and cardiomyocytes - on the characteristics of viscoelastic hysteresis at different frequencies. In this paper a new method was introduced for the analysis of the viscoelastic characteristics of the force hysteresis in the isolated myocardial preparation for the assessment of mechanical energy expenditure in the tension-compression cycle...
2017: Acta of Bioengineering and Biomechanics
Justyna Ogrodnik, Szczepan Piszczatowski
PURPOSE: The aim of the present study was to evaluate the influence of modified morphological parameters of the muscle model and excitation pattern on the results of musculoskeletal system numerical simulation in a cerebral palsy patient. METHODS: The modelling of the musculoskeletal system was performed in the AnyBody Modelling System. The standard model (MoCap) was subjected to modifications consisting of changes in morphological parameters and excitation patterns of selected muscles...
2017: Acta of Bioengineering and Biomechanics
Danny Vogel, Andreas Rathay, Stephanie Teufel, Martin Ellenrieder, Carmen Zietz, Manuela Sander, Rainer Bader
PURPOSE: In THA a sufficient primary implant stability is the precondition for successful secondary stability. Industrial foams of different densities have been used for primary stability investigations. The aim of this study was to analyse and compare the insertion behaviour of threaded and press-fit cups in vivo and ex vivo using bone substitutes with various densities. METHODS: Two threaded (Bicon Plus®, Trident® TC) and one press-fit cup (Trident PSL®) were inserted by orthopaedic surgeons (S1, S2) into 10, 20 and 31 pcf blocks, using modified surgical instruments allowing measurements of the insertion forces and torques...
2017: Acta of Bioengineering and Biomechanics
Luciana S Moreira, Leonardo A Elias, Adriane B Gomide, Marcus F Vieira, Waldemar N DO Amaral
PURPOSE: The present study aimed at investigating the control of upright quiet standing in pregnant women throughout pregnancy, and whether low-back pain exerts influence on this motor task. METHODS: Myoelectric signals from postural muscles and stabilometric data were collected from 15 non-pregnant and 15 pregnant women during upright quiet standing. Electromyogram envelopes and center of pressure metrics were evaluated in the control group, as well as in pregnant women in their first and third trimester of pregnancy...
2017: Acta of Bioengineering and Biomechanics
Michał Starosta, Joanna Kostka, Justyna Redlicka, Elżbieta Miller
PURPOSE: The aim of this study was to determine the muscles with the lowest strength in non-affected (non-A) and affected upper limb (A), to assess differences between men and women and to correlate these values with age in patients after stroke. METHODS: Sixty patients (40 male, 20 female), hospitalized in Neurorehabilitation Ward, 1-2 weeks after stroke, were included in the study. Their age ranged from 50 to 80 years with a mean (sd) of 65.5 (18.7) years. Muscle force values from upper limb muscles were measured using the MicroFet 2 hand-held dynamometer...
2017: Acta of Bioengineering and Biomechanics
Abas Ramiar, Morsal Momenti Larimi, Ali Akbar Ranjbar
PURPOSE: Hemodynamic factors, such as Wall Shear Stress (WSS), play a substantial role in arterial diseases. In the larger arteries, such as the carotid artery, interaction between the vessel wall and blood flow affects the distribution of hemodynamic factors. The fluid is considered to be non-Newtonian, whose flow is governed by the equation of a second-grade viscoelastic fluid and the effects of viscoelastic on blood flow in carotid artery is investigated. METHODS: Pulsatile flow studies were carried out in a 3D model of carotid artery...
2017: Acta of Bioengineering and Biomechanics
Jacek Stodółka, Małgorzata Sobera
PURPOSE: The purpose of the research was twofold: (1) to describe the normal asymmetry in lower limb loading during a normal stance and during a stance with visual and vestibular disturbance relating to the lower limb dominance, (2) to assess relations of loading of both lower limbs with body weight and height (BMI) and leg functional dominance. METHODS: The subjects of this study were 95 students. Settings of the two Kistler platforms were used to register the time series of the vertical component of the ground reaction force while the subject was standing (45 seconds) in a normal position and next with eyes covered with a band and head tilted back position with one leg placed on one platform and the other on the second platform...
2017: Acta of Bioengineering and Biomechanics
Luís Faria, Bárbara Campos, Renato Natal Jorge
PURPOSE: The shoulder girdle is a complex system, comprised by a kinematic chain and stabilizers. Due to the delicate equilibrium and synchronism between mobility and stability, high external loads may compromise its physiology, increasing the risk of injuries. Thus, this study intends to fully characterize the effects of a rugby tackle on the shoulder's anatomy and physiology. METHODS: For the experimental procedures, a matrix of pressure sensors was used, based on the Teckscan® pressure in-soles, force plates, an isokinetic dynamometer and sEMG (surface electromyography)...
2017: Acta of Bioengineering and Biomechanics
Lorenzo Zanelli, Silvia Todros, Emanuele L Carniel, Piero G Pavan, Piero G Pavan
PURPOSE: In this work, the mechanical behavior of two block copolymers for biomedical applications is studied with particular regard to the effects induced by a steam sterilization treatment that biomedical devices usually undergo in healthcare facilities. This investigation is aimed at describing the elasto-plastic behavior of the stress-strain response, determining a functional dependence between material constitutive parameters, to obtain an optimal constitutive model. METHODS: The mechanical properties of these polymers are analyzed through uniaxial tensile tests, before and after the sterilization process...
2017: Acta of Bioengineering and Biomechanics
Antoni Kopyt, Krystyna Zużewicz, Paweł Bartuzi
In engineering the human is considered as one of the system elements. In most studies, his/her model remains unchanged due to the external factors. The present study shows that a relation between the mental stress and human dynamics cannot be neglected. The dynamic characteristics of the operator model change due to external stimuli, i.e., mental stress. The aim of this study was to present identification of a mathematical human model and measurement methodology of the mental stress level. To determine the level of human response to external stimuli, the electrocardiography (ECG) and electromyography (EMG) methods were applied...
2017: Acta of Bioengineering and Biomechanics
Maria Vittoria Caruso, Raffaele Serra, Paolo Perri, Gianluca Buffone, Francesco Giuseppe Caliò, Stefano DE Franciscis, Fragomeni Fragomeni
PURPOSE: Hemodynamics has a key role in atheropathogenesis. Indeed, atherosclerotic phenomena occur in vessels characterized by complex geometry and flow pattern, like the carotid bifurcation. Moreover, lifestyle is a significant risk factor. The aim of this study is to evaluate the hemodynamic effects due to two sedentary lifestyles - sitting and standing positions - in the carotid bifurcation in order to identify the worst condition and to investigate the atherosclerosis incidence. METHODS: The computational fluid dynamics (CFD) was chosen to carry out the analysis, in which in vivo non-invasive measurements were used as boundary conditions...
2017: Acta of Bioengineering and Biomechanics
Katarzyna Kaczmarczyk, Michalina Błażkiewicz, Andrzej Wit, Michał Wychowański
PURPOSE: The purpose of this study was to derive reference values for a four-level scale intended to evaluate variation in free gait asymmetry measurements in healthy subjects. METHODS: This evaluation is based on kinetic values for the left and right lower limbs during gait, registered with advanced measurement systems and assessed using the symmetry index (SI) developed by Robinson. RESULTS: For the majority of parameters, the SI does not follow normal distribution...
2017: Acta of Bioengineering and Biomechanics
Sławomir Winiarski, Alicja Rutkowska-Kucharska, Paweł Zostawa, Natalia Uścinowicz-Zostawa, Sebastian Klich
PURPOSE: Nowadays, fashion has caused that many young women are wearing high-heeled shoes. Therefore, the aim of this study was to examine the effects of long-term walking in high-heeled shoes on the foot mechanics during barefoot gait. METHODS: Forty-three young women (22 ± 2.1 years) divided into two groups participated in this retrospective cohort study. The first group was composed of women who frequently wear high-heeled footwear. The second, infrequent wearers group, consisted of women who preferred flat-heeled shoes...
2017: Acta of Bioengineering and Biomechanics
Agnieszka Guzik, Mariusz Drużbicki, Grzegorz Przysada, Andrzej Kwolek, Agnieszka Brzozowska-Magoń, Marek Sobolewski
PURPOSE: Subjects with post-stroke hemiparesis frequently present with asymmetric gait patterns. Symmetry, reflecting similarities in temporospatial, kinematic parameters, is an important measure of gait assessment. The study was designed to examine the relationships between asymmetry of temporal, spatial and kinematic gait parameters and walking velocity and distance. METHODS: Temporospatial and kinematic gait parameters were examined in a group of 50 chronic post-stroke subjects and in a group of 25 healthy controls...
2017: Acta of Bioengineering and Biomechanics
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"