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Zdjęcie profilowe: dr hab. inż. Wiktoria Wojnicz

dr hab. inż. Wiktoria Wojnicz

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Rok 2024
  • Enhancing rheological muscle models with stochastic processes
    Publikacja

    - Acta of Bioengineering and Biomechanics - Rok 2024

    Purpose: Biological musculoskeletal systems operate under variable conditions. Muscle stiffness, activation signals, and loads change during each movement. The presence of noise and different harmonic components in force production significantly influences the behaviour of the muscular system. Therefore, it is essential to consider these factors in numerical simulations. Methods: This study aims to develop a rheological mathematical...

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  • Modeling and Strength Calculations of Parts Made Using 3D Printing Technology and Mounted in a Custom-Made Lower Limb Exoskeleton
    Publikacja
    • S. Śpiewak
    • W. Wojnicz
    • J. Awrejcewicz
    • M. Mazur
    • M. Ludwicki
    • B. Stańczyk
    • B. Zagrodny

    - Materials - Rok 2024

    This study is focused on the application of 3D-printed elements and conventional elements to create a prototype of a custom-made exoskeleton for lower limb rehabilitation. The 3D-printed elements were produced by using Fused Deposition Modeling technology and acrylonitrile butadiene styrene (ABS) material. The scope of this work involved the design and construction of an exoskeleton, experimental testing of the ABS material and...

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  • Timed rolling and rising tests in Duchenne muscular dystrophy ambulant boys: a feasibility study
    Publikacja
    • A. Sobierajska-Rek
    • J. Jabłońska-Brudło
    • A. Dąbrowska
    • W. Wojnicz
    • J. Meyer-Szary
    • J. Wierzba

    - MINERVA PEDIATRICA - Rok 2024

    BACKGROUND: Functional activities are extensively used in motor assessments of patients with Duchenne muscular dystrophy. The role of timed items has been reported as an early prognostic factor for disease progression. However, there are two functional activities that are not widely assessed in clinical practice among Duchenne muscular dystrophy patients: rolling and bed rising. This study aimed to investigate whether the 360-degree...

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  • Towards hand grip force assessment by using EMG estimators
    Publikacja
    • R. Barański
    • W. Wojnicz
    • B. Zagrodny
    • M. Ludwicki
    • A. Sobierajska-Rek

    - MEASUREMENT - Rok 2024

    The purpose of this study was to propose a method to assess individual regression (calibration) curves to establish a relationship between an isometric grip force and surface electromyography (EMG) estimator. In this study 18 healthy volunteers (12 male (23.0 ± 2.0 years) and 6 female (23.2 ± 0.7 years)) had been examined. Ten EMG estimators (mean absolute value, root mean square, entropy, energy, turns per second, mean of zero...

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  • Unsupervised Learning for Biomechanical Data Using Self-organising Maps, an Approach for Temporomandibular Joint Analysis

    We proposed to apply a specific machine learning technique called Self-Organising Maps (SOM) to identify similarities in the performance of muscles around human temporomandibular joint (TMJ). The performance was assessed by measuring muscle activation with the use of surface electromyography (sEMG). SOM algorithm used in the study was able to find clusters of data in sEMG test results. The SOM analysis was based on processed sEMG...

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Rok 2023
Rok 2022
Rok 2021
Rok 2020
  • Could thermal imaging supplement surface electromyography measurements for skeletal muscles?
    Publikacja
    • B. Zagrodny
    • W. Wojnicz
    • M. Ludwicki
    • J. Awrejcewicz

    - IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT - Rok 2020

    Abstract—(1) Background: The aim of this study is to present the results of experiments in which surface electromyography (sEMG) and thermal imaging were used to assess muscle activation during gait and to verify the hypothesis that there is a relationship in the case of low fatigue level between sEMG measured muscle activation, assessed in the frequency domain, and thermal factors calculated as minimum, maximum, kurtosis, mean,...

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  • Mechaniczne Metody Badań Materiałów
    Publikacja

    W podręczniku zawarto opis Laboratorium Wytrzymałości Materiałów znajdującego się w Katedrze Mechaniki i Mechatroniki na Wydziale Mechanicznym Politechniki Gdańskiej oraz instrukcje do szesnastu ćwiczeń laboratoryjnych dla studentów wszystkich kierunków studiów oferowanych na Wydziale. Ćwiczenia dotyczą zagadnień związanych ze statycznymi i dynamicznymi próbami niszczącymi, badań materiałów na ściskanie i rozciąganie, badań twardości,...

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  • Perceptual and Motor Effects of Muscle Co-activation in a Force Production Task
    Publikacja

    - NEUROSCIENCE - Rok 2020

    We tested several predictions of the theory of motor control with spatial referent coordinates related to effects of muscle coactivation on force production and perception. In particular, we predicted that subjects would produce unintentional force increase by finger flexors and be unaware of this force increase. Healthy subjects performed steady force production task in isometric conditions with visual feedback on the force level....

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Rok 2019
  • Influence of the shoe type on the ground reaction forces
    Publikacja
    • M. Klepczyńska
    • B. Zagrodny
    • W. Wojnicz
    • M. Ludwicki
    • J. Awrejcewicz

    - Rok 2019

    The aim of this work was to estimate a relationship between the type of the footwear and ground reactions. Differences in medio-lateral, anterior-posterior and vertical reactions are compared for different shoe-types for male and female volunteers. Each of the participants gait was recorded in case of different shoes and without them, also stabilograms were analyzed. Results revealed differences in ground reaction forces for different...

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  • Jaw biomechanics: Estimation of activity of muscles acting at the temporomandibular joint

    The aim of this study was to elaborate a method of estimation of activity of surface muscles acting at the temporomandibular joint of the healthy subjects by using a surface electromyography (EMG). The scope of this study involved testing chosen jaw motions (open, close, lateral deviation) and process of mastication occurring during eating food with different toughness (chewing gum, cereal and carrot) by using mixed sides, right...

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  • Multibody models for gait analysis
    Publikacja

    - Rok 2019

    The aim of this study was to create multibody biomechanical models to analyze a normal gait of the human. Proposed models can be used to identify joint moments of the lower limbs during normal gait in the single and double support phases. Applying Newton-Euler formulation, following planar models were developed: 1) a mathematical 6DOF model describing a gait in the sagittal plane of the body for single support phase and double...

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Rok 2018
  • Approach for Determination of Functioning of Lower Limb Muscles
    Publikacja
    • W. Wojnicz
    • B. Zagrodny
    • M. Ludwicki
    • M. Syczewska
    • J. Mrozowski
    • J. Awrejcewicz

    - Rok 2018

    The purpose of the study is elaboration of approach for determination of functioning of chosen muscles that are essential for gait performance (Tibialis Anterior, Rectus Femoris, Gastrocnemius Medialis, Biceps Femoris). The scope of the study involves the analysis of the symmetric planar motion performing in the sagittal plane of the body by applying planar multibody model and electromyography signals (EMG) registered over normal...

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  • Biomechaniczne modele układu mięśniowo-szkieletowego człowieka
    Publikacja

    - Rok 2018

    Niniejsza monografia jest poświęcona problemom modelowania zachowania układu mięśniowo-szkieletowego człowieka. Publikacja zawiera opis badań rozwijanych w zakresie: biomechaniki mięśni, biomechaniki zespołów mięśniowych, biomechaniki układu szkieletowego, biomechaniki narządu ruchu, a także zastosowania sygnałów fizjologicznych (elektromiograficznych) oraz projektowania urządzeń do rehabilitacji na podstawie zasad sterowania...

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  • Cooperation of mono- and bi-articular muscles: human lower limb
    Publikacja
    • B. Zagrodny
    • M. Ludwicki
    • W. Wojnicz
    • J. Mrozowski
    • J. Awrejcewicz

    - JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS - Rok 2018

    Objectives: The aim of this study was to create and analyze a Pareto-optimal problem that would describe cooperation between mono- and bi-articulate lower limb muscles in sagittal plane. Methods: Equations describing the problem were derived and analyzed, additional constrains were introduced and experimental verification based on gait video analysis was performed. Results: Uncertainty of Pareto-optimal solution is shown for the...

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  • FEM approach to modeling of an irregular trabecular structure
    Publikacja

    The aim of the study is elaboration of a method for creating irregular scaffolds that can be used to model the behaviour of trabecular bone placed in the proximal epiphysis of the femur. The scope of the study encompasses creating six numerical models of irregular scaffolds (two solid irregular scaffolds, two shell irregular scaffolds and two shell irregular scaffolds with fortification) and performing numerical analysis of the...

  • Numerical analysis of mechanical properties of an infill structure used in 3D printings

    The paper presents results of a numerical analysis focused on an identification of mechanical properties of an element created by using Fused Deposition Modelling additive manufacturing technique (FDM). There is presented a description of technology of the 3D printing, numerical model created by using the finite element method (FEM), as well as some problems referred to estimation of the mechanical properties of the printout. The...

Rok 2017
  • A two dimensional approach for modelling of pennate muscle behaviour
    Publikacja

    - Biocybernetics and Biomedical Engineering - Rok 2017

    The purpose of this study was to elaborate a two-dimensional approach for unipennate and bipennate striated skeletal muscle modelling. Behavior of chosen flat pennate muscle is modelled as a rheological system composed of serially linked passive and active fragments having different mechanical properties. Each fragment is composed of three elements: mass element, elastic element and viscous element. Each active fragment furthermore...

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  • Modele biomechaniczne układów mięśniowo-szkieletowych
    Publikacja

    - Rok 2017

    Zakres niniejszej pracy obejmuje: 1) przedstawienie podstawowych cech fizjologicznych będących podstawą do zamodelowania zachowania pojedynczego mięśnia szkieletowego (biomechanika mięśnia szkieletowego) oraz zespołu mięśni (biomechanika zespołu mięśni szkieletowych); 2) zaprezentowanie sposobu modelowania zachowania mięśnia szkieletowego obłego (wrzecionowatego) i pierzastego oraz układu mięśni jednostawowych i dwustawowych;...

  • Numerical modelling of 3D printout using line (1D) elements
    Publikacja

    A proposition of some numerical modelling of the 3D printout is presented in the paper. The proposed model is composed of some 1D elements. The resulting numerical model of the infill consist of beam, spring and rigid elements. Obtained results confirm correctness of the proposed modelling method. Two methods of estimation of the spring parameters are proposed in the paper. In the first method, mechanical properties of the connecting...

Rok 2016
  • Influence of Additional Loads on Chosen Gait Parameters and Muscles Activity
    Publikacja
    • M. Ludwicki
    • B. Zagrodny
    • W. Wojnicz
    • J. Mrozowski
    • J. Awrejcewicz

    - Vibrations in Physical Systems - Rok 2016

    This paper is devoted to human motion analysis and comparison of chosen kinematics parameters during normal gait with and without additional load in a form of backpack. A stability in both cases were compared in both frontal and sagittal planes, by applying a video tracking system. Experimental tests performed on treadmill, passive markers, placed on volunteers bare skin were used. Additionally, an infra-red camera was employed...

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  • Numerical Model of Femur Part

    The aim of the study is to create a new more accurate method of femur part modelling by using the finite element method. According to this new method, a femur part is treated as a complex structure composed of trabecular bone (internal part) and cortical bone (external part). The internal part is modelled as a scaffold, thus the external part is modelled as a coat (i.e. covering). Applying the programme ABAQUS, there were created...

  • Zastosowanie EMG do analizy wybranych ruchów kończyny górnej

    Celem badań było przeprowadzenie pomiarów sygnału mioelektrycznego czterech mięśni powierzchniowych lewej kończyny górnej, biorących udział w ruchach zginania-prostowania w stawie łokciowym w płaszczyźnie strzałkowej. Rejestrację elektromiogramów (EMG) odprowadzono z: głowy długiej oraz bocznej mięśnia trójgłowego ramienia, głowy długiej mięśnia dwugłowego ramienia i mięśnia ramienno-promieniowego. Wykazano, iż metoda może zostać...

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Rok 2015
  • Mathematical model of pennate muscle
    Publikacja

    - Rok 2015

    The purpose of this study is to create a new mathematical model of pennate striated skeletal muscle. This new model describes behaviour of isolated flat pennate muscle in two dimensions (2D) by taking into account that rheological properties of muscle fibres depend on their planar arrangement. A new mathematical model is implemented in two types: 1) numerical model of unipennate muscle (unipennate model); 2) numerical model of...

  • Modelowanie zachowania układu mięśni
    Publikacja

    W rozdziale są opisane podejścia do zamodelowania zachowania zespołu mięśni, które są oparte o zasady mechaniki. Zgodnie z tymi zasadami problem zamodelowania zachowania zespołu mięśni należy rozwiązać jako odwrotne lub proste zadanie dynamiki. Odwrotne zadanie dynamiki pozwala na wyznaczenie sił/momentów generowanych przez poszczególne mięśnie na podstawie danych kinematycznych, tzn. trajektorii ruchu oraz jej pochodnych (prędkości...

Rok 2014
Rok 2013
  • Method of Skeletal System Modelling

    An original method of skeletal system modelling is presented in detail. Using DICOM images obtained from CT and PET tests, shell models of nine bones were created (humerus, radius, ulna, scapula, clavicle, femur, tibia, fibula, pelvis). Two methods of bone behaviour are also proposed, the first method treating the bone as a solid structure and the second method treating the bone as a complex porous structure. The behaviour of model...

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  • Modelling of planar movement dynamics of upper limb
    Publikacja

    The original model describing planar movement dynamics of upper limb is presented. The upper limb is modelled as two-joints system loaded by external forces and internal forces of striated skeletal muscles. A behaviour of each muscle is modelled as a system composed of serially linked rheologic fragments that have different mechanical properties. These muscle models allow us to simulate a behaviour of short fusiform muscle (3DOF...

Rok 2012
  • Application of muscle model to the musculoskeletal modeling

    The purpose of this paper is to investigate new fusiform muscle models. Each of these models treats a muscle as a system composedof parts characterized by different mechanical properties. These models explain the influence of differences in the stiffness of lateral parts and the degree of muscle model discretization. Each muscle model is described by a system of differential equations and a single integro-differential equation....

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Rok 2011
  • Chosen aspects of muscle biomechanics
    Publikacja

    Considering a striated skeletal muscle as a different properties mechanical system, one can understand series of important phenomena happening in a real muscle phenomenon of muscle: 1) force delivery to skeletal apparatus through tendons; 2) changing of exerted muscle belly mass distribution with regards to skeletal apparatus; 3) beginning drop of muscle force. A disregard of first phenomenon causes an impossibility to explain...

Rok 2010
Rok 2009
  • Analysis of muscles behaviour : The computational model of muscle. -Part I

    W artykule zaproponowano model obliczeniowy mięśnia szkieletowego, który potraktowano jako strukturę o złożonych i zróżnicowanych właściwościach mechanicznych. Szczegółowo opisano metodę identyfikacji tych właściwości. Ponadto określono sposób przeprowadzenia weryfikacji ilościowej i jakościowej zaproponowanego modelu. Za pomocą takiego obliczeniowego modelu mięśnia można łatwo określać siły w mięśniach, które należą do zespołu...

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  • Modelowanie i symulacja zachowania zespołu mięśni szkieletowych układu ramię-przedramię
    Publikacja

    - Rok 2009

    Praca jest poświęcona modelowaniu zachowania zespołu mięśni szkieletowych poprzecznie prążkowanych, które działają w układzie ramię-przedramię. W pracy zaproponowano dwa nowe modele obliczeniowe: model zachowania mięśnia (model mięśnia) oraz model zachowania zespołu mięśni układu ramię-przedramię (model zespołu mięśni). Wykonano badania numeryczne modelu mięśnia i modelu zespołu mięśni oraz uzyskano zadowalające wyniki weryfikacji...

Rok 2008
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Rok 2005
Rok 2004
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