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Comparison of ground reaction forces during the Basic Step on the Core Board platform at various levels of stability

Karczewska M., Madej A., Sadowska A., Mastalerz A., Urbanik Cz.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 4

63--70

EN

Purpose: The aim of this paper was to examine and compare the changes of ground reaction forces observed during the Basic Step on the Core Board fitness device at various levels of stability. Material and method: The study involved 10 female students. Participants stepped on and off the Core Board 10 times at 3 levels of stability. After completing a series of steps, the Core Board’s stability was modified and the participant repeated the whole series. The measurement platform to examine three components of the reaction force (horizontal in the sagittal and frontal planes, and vertical) was used. Results: The ground reaction force (GRF) observed on the Core Board, in the vertical and horizontal components is higher at all three levels of stability than on the platform without the device. Significant differences in GRF were observed in the horizontal component in the frontal plane (Fz) at all three levels of mobility as well as in impulse, measured on platforms with the device. Conclusion: The results on the Core Board training device present highest horizontal ground reaction forces in frontal plane at the highest level of Core Board mobility and this showing little medio-lateral stability and a more reactive way of movement regulation of the participants. As a consequence of the force patterns found it may be suggested that fitness training concepts should focus more possibly higher strains on the locomotor system most likely caused by changed ground reaction force patterns, an idea that has to be further analyzed with more complex measurement approaches.

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Wybrane zagadnienia magazynowania w przedsiębiorstwie z branży spożywczej

Rudawska A., Karczewska M.

TTS Technika Transportu Szynowego

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2015

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R. 22, nr 12

2848--2852

PL

W związku z określonym czasem przydatności produktów spożywczych oraz surowców potrzebnych do wyprodukowania tych produktów, jednym z najważniejszych zagadnień związanych z zarządzaniem w zakładzie branży spożywczej jest magazynowanie surowców oraz produktów gotowych. Magazyny te muszą być funkcjonalne oraz dostosowane do wielu wymagań, jakie są związane z charakterystyką produkcji spożywczej. W artykule scharakteryzowano wybrane elementy wyposażenia oraz transportu znajdujące się w magazynach analizowanego zakładu. Ponadto opisano wybrane warunki składowania surowców najczęściej stosowanych w zakładzie produkującym wyroby cukiernicze.

EN

In connection with the specified time the usefulness of food products and raw materials needed to manufacture these products, one of the most important issues related to the management of the plant the food industry is the storage of raw materials and finished products. These magazines need to be functional and adapted to many of the requirements are linked to characteristics of food production. The article described the selected items of equipment and transportation located in the analysis. In addition, describes the selected storage conditions of raw materials most commonly used in a plant producing confectionery.

3

Symmetry of proprioceptive sense in female soccer players

Iwańska D., Karczewska M., Madej A., Urbanik Cz.

Acta of Bioengineering and Biomechanics

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2015

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Vol. 17, no. 2

155--163

EN

Purpose: The purpose of the study was to assess the symmetry of proprioceptive sense among female soccer players when trying to reproduce isometric knee extensions (right and left) and to analyze the impact of a given level of muscle force on proprioception. Methods: The study involved 12 soccer players aged 19.5 ± 2.65 years. Soccer players performed a control measurement of a maximum 3s (knee at the 90°) position in the joint. Subsequently, 70%, 50%, and 30% of the maximum voluntary contraction (MVC) were all calculated and then reproduced by each subject with feedback. Next, the players reproduced the predefined muscle contraction values in three sequences: A – 50%, 70%, 30%; B – 50%, 30%, 70%; C – 70%, 30%, 50% of MVC without visual control. Results: In every sequence, the participants found obtaining the value of 30% of MVC the most difficult. The value they reproduced most accurately was 70% of MVC. Both trial II and trial III demonstrated that the symmetry index SI significantly differed from values considered acceptable (SIRa). In each successive sequence the largest asymmetry occurred while reproducing the lowest values of MVC (30%) (p < 0.05). Conclusion: High level of prioprioceptive sense is important to soccer players due to the extensive overload associated with dynamics stops or changes in direction while running. Special attention should be paid to develop skills in sensing force of varying levels. It was much harder to reproduce the predefined values if there was no feedback.

4

Komputerowy model mechanicznego zespolenia ścian żołądka

Karczewska M.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

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2015

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Vol. 21, nr 4

191--200

PL

Celem pracy jest zoptymalizowanie połączenia szytego ścian żołądka. Optymalizacja ma obejmować zmianę konfiguracji zszywek, co wpłynie na poprawę szczelności zespolenia. W niniejszej pracy omówiony został sposób tworzenia modelu elementów skończonych MES tkanki miękkiej. Przedstawione założenia będą stanowić bazę do dalszych modyfikacji, opartych na danych materiałowych, zebranych w trakcie badań elastyczności próbek tkanki żołądka. Działania te mają na celu znalezienie modelu hipersprężystego, najlepiej opisującego charakter badanego materiału.

EN

The main goal of this work is optimization of the surgical connection (sutures) of stomach walls. The staples’ configuration changes should be reflected in the improved anastomotic tightness. In this paper it is explained how to create the FEM model of soft tissue. It will be a base for further modifications based on the material data collected during the study of flexibility of stomach tissue samples. The main goal is determine the hyperelastic model optimally describing the nature of the tested material.

5

Evaluation of the effectiveness of training on a machine with a variable-cam

Urbanik C., Staniszewski M., Mastalerz A., Karczewska M., Lutosławska G., Iwańska D., Madej A., Ostrowska E., Gwarek L., Tkaczyk J.

Acta of Bioengineering and Biomechanics

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2013

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Vol. 15, no. 4

93--102

EN

The aim of the study was to assess the effectiveness of the training of elbow flexors through the use of 2 machines, one of which was equipped with a disc plate of constant radius, the other one with a variable-cam having a radius adjustable to muscle strength. The experiment included 45 men divided into 3 equal groups: training group A (variable-cam), training group B (circle), and control group C. The training lasted for 8 weeks, 3 times a week. In order to control the effects, the values of peak torque and power of the flexor muscles of the elbow were isokinetically measured for the angular velocities of 30°/s and 60°/s. Also taken were anthropometric measurements of the arm and the creatine kinase (CK) activity in the blood plasma. As a result of the training, significant increases of biomechanical values were noted only in group A: power increased over 20%, the peak torque over 14%. After the training, significant increases of arm circumference in the relaxed position were noted in group A (17 mm), as well as in group B (11 mm). Also, some changes in CK activity were observed between Monday and Friday in a training week. On the basis of the experimental measurements, it may be ascertained that training elbow flexor muscles on a machine with a variable-cam is more efficient for increases in strength and power, as well as for some anthropometric parameters, than training on a machine with a disc plate.

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Influence of time of rest on the power decrease during exercising on the inclined plane

Witkowska I., Urbanik Cz., Karczewska M.

Acta of Bioengineering and Biomechanics

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2012

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Vol. 14, no. 3

17-22

EN

The aim of this paper is to investigate the influence of the time of rest on the change of maximal and average power as a function of time during training on an inclined plane. The values of power, developed during 7 series of 10 bounces with a 0.5 and 1 minute break, were analyzed. The research was conducted on 10 female students from the second year of master studies with a major of physical education. Taking into account the results obtained, which were compared to data from other sources, it is possible to conclude that the value of maximal power for the whole group examined during the training with a 0.5 minute break decreased by 22%, and for the training with a 1 minute break by 12%. One can assume that the training with a 0.5 minute break was more tiring, and for that reason students were not able to regenerate fully so as to bounce in the subsequent series. That is why one should say that the second method of training is more efficient for the evaluation of the maximal power of the contestant.