Wyniki wyszukiwania - BazTech

1

The meaning of physical activity in the quality of life management aspect

Rosak-Szyrocka Joanna, Clark Cain C. T., Abbas Ali Abdulhassan, Ullah Irfan

Quality Production Improvement - QPI

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2020

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Vol. 2, Iss. 1

69--76

EN

Quality of life is an ambiguous concept with a medical, sociological and economic dimension, as well as psychological, the most subjective one. Physical activity is considered one of the most important elements of a healthy lifestyle and a factor that determines the physical and mental health of an individual. The article presents the issue of physical activity in the aspect of quality of life management. It was found that respondents notice a very large relationship between sport and quality of life. The authors showed that it is very important in the quality of life management aspect not only to promote physical culture, but also to develop the habit of practicing it.

2

Approximate solutions and numerical analysis of a spring-mass running model

Wróblewska Zofia

Mathematica Applicanda

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2020

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Vol. 48, no. 1

25--48

EN

The paper refers to the classic spring-mass model of running, which was created on the basis of an inverted elastic pendulum. A new approximate solution of the boundary value problem relayed to the governing system based on two nonlinear ordinary differential equations is introduced, which we get in this model in a natural way. We give theoretical support by deriving asymptotic behaviour of obtained approximations. Simulations show that new solutions turn out very well. Our results are illustrated with some practical examples.

PL

W pracy rozważamy klasyczny model masy sprężynowej dla biegania oparty na odwróconym elastycznym wahadle. Przedstawiamy nowe przybliżone rozwiązanie interesującego zagadnienia brzegowego dla układu dwóch nieliniowych równań różniczkowych, które w naturalny sposób uzyskujemy w tym modelu. Badamy asymptotyczne zachowanie uzyskanych aproksymacji i podajemy asymptotyczną postać współczynnika spężystości nogi dla małych kątów ataku. Symulacje pokazują, że nowe rozwiązanie wypadło bardzo dobrze i wykazało dużą zgodność przybliżenia z rozwiązaniem dokładnym. Nasze wyniki zostały zilustrowane kilkoma praktycznymi przykładami pokazując, że pomiary parametrów biegu lekkoatletów są bliskie wartościom uzyskanym z modelu.

3

Quality of life improvement in Kaizen aspect

Rosak-Szyrocka Joanna

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

528--536

EN

The aim of the research is to analyze the quality of life improvement (Kaizen) in the running aspect in Poland. Until now, issues related to the running analysis of the quality life in terms were not the subject of broader, comprehensive scientific considerations. The research was taken in 2019 year and covered a group of 396 runners. The respondents are women posing 67,9% and men posing 32,1% residing in different areas of Poland. The research was based on a questionnaire (CAWI - Computer Assisted Web Interview). Although for most respondents the result is not the most important, they try to improve their running attitude and time. Runners use different ways to be motivated to work on themselves. An example of motivators can be a medal, obtained at the finish line or sharing success with participation in competition on social networks (Facebook).

4

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

Sinclair Jonathan, Ingram Jane, Taylor Paul John, Chockalingam Nachiappan

Acta of Bioengineering and Biomechanics

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2019

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Vol. 21, nr 4

13--25

EN

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). Kinematics of the lower extremities were collected using an eight-camera motion capture system and lower extremity joint loading also explored using a musculoskeletal simulation approach. Differences between orthoses conditions were examined using 2  2 mixed ANOVA. Results: External instantaneous load rate was significantly reduced in the off the shelf orthoses (male = 1290.60 and female = 1567.10 N/kg/s), compared to the medial (male = 1480.45 and female = 1767.05 N/kg/s) and semi-custom (male = 1552.99 and female = 1704.37 N/kg/s) conditions. In addition, peak patellofemoral stress was significantly lower in the off the shelf orthoses (male = 68.55 and female = 94.91 KPa/kg) compared to the lateral condition (male = 70.49 and female = 103.22 KPa/kg). Finally, peak eversion angles were significantly attenuated in the medial orthoses (male = –6.61 and female = –7.72 deg) compared to the lateral (male = –9.61 and female = –10.32 deg), no-orthoses (male = –8.22 and female = –10.10 deg), semi-custom (male = –8.25 and female = –9.49 deg) and off the shelf (male = –7.54 and female = –8.85 deg) conditions. Conclusions: The current investigation shows that different orthotic devices/ configurations may provide distinct benefits in terms of their effectiveness in attenuating the biomechanical parameters linked to the aetiology of chronic running injuries.

5

The influence of minimalist and conventional sports shoes and lower limbs dominance on running gait

Jandova S., Volf P., Vaverka F.

Acta of Bioengineering and Biomechanics

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2018

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Vol. 20, nr 3

3--9

EN

Purpose: The aim of this study was to determine how minimalist running shoes (MRS), conventional running shoes (CRS) and the dominance of lower limbs influence the running gait. Methods: Trained recreational runners (N = 13) who have been engaged in regulary running for more than one year were participants in this study. They were experienced with using MRS and CRS for more than half year and they used both types of shoes. An in-shoe pressure measuring system (Pedar-X®, Novel, Munich, Germany) was used to monitor plantar pressure and vertical force and the temporal parameters when running in MRS and CRS during the stance phase, the swing phase and over one stride. Results: Running in CRS significantly prolonged stance, swing and stride phases by 2–11% compared to MRS. In contrast, when running in MRS significantly larger values of maximum pressure (9–14%) and maximum vertical force (3–7%) than in CRS were found. Conclusions: For this reason, running in MRS could be recommended to recreational runners only with care. The effect of limb dominance on temporal characteristics was detected when running in CRS. Significantly longer stance phase for dominant limb is associated with a shorter swing. The kinematics variables were significantly higher for dominant limb than for non-dominat limb when running in MRS and CRS (by 12–23%).

6

Relationship between lower limbs kinematic variables and effectiveness of sprint during maximum velocity phase

Struzik A., Konieczny G., Grzesik K., Stawarz M., Winiarski S., Rokita A.

Acta of Bioengineering and Biomechanics

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2015

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Vol. 17, nr 4

131--138

EN

Purpose: The aim of the study was to determine the relationships between time of running over a 15–25 m section of a 30-meter run along a straight line and changes in the angle and angular velocity observed in ankle, knee and hip joints. Therefore, the authors attempted to answer the question of whether a technique of lower limbs movement during the phase of sprint maximum velocity significantly correlates with the time of running over this section. Methods: A group of 14 young people from the Lower Silesia Voivodeship Team participated in the experiment. A Fusion Smart Speed System was employed for running time measurements. The kinematic data were recorded using Noraxon MyoMotion system. Results: There were observed statistically significant relationships between sprint time over a section from 15 to 25 m and left hip rotation (positive) and between this time and left and right ankle joint dorsi-plantar flexion (negative). Conclusions: During the maximum velocity phase of a 30 m sprint, the effect of dorsi-plantar flexion performed in the whole range of motion was found to be beneficial. This can be attributed to the use of elastic energy released in the stride cycle. Further, hip rotation should be minimized, which makes the stride aligned more along a line of running (a straight line) instead of from side to side.

7

Kinematic and kinetic analyses of novice running in dress shoes and running shoes

Lee Y., Kim Y. K., Kim Y. H., Kong S., Lee K. K.

Acta of Bioengineering and Biomechanics

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2011

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Vol. 13, nr 3

55-61

EN

The purpose of the study was to investigate how novice runners adjust their lower extremities in heel-toe running while they wear dress shoes and running shoes. Ten novice male runners repeatedly ran across a force plate at 4 m/s in each type of shoes. Joint kinematics and kinetics, vertical ground reaction force, and utilized coefficient of friction during the stance phase were quantified. The results obtained showed no differences in impact peaks, stance time, stride length and joint kinematics. However, dorsiflexion moment was significantly greater with dress shoes (407 Nm) compared to that with running shoes (304 Nm; p < 0.05). Compared to the runners in running shoes (0.23), the runners in dress shoes (0.20) achieved a significantly lower utilized coefficient of friction ( p < 0.05). When running in dress shoes, novice runners tended to use better a dorsiflexion moment than when running in running shoes. This adaptation appears to minimize the chances of slipping at the moment of heel strike.

8

Analyze of vertical acceleration of the body mass center during running on treadmill

Staniak Z., Buśko K., Karpiłowski B., Nosarzewski Z., Witek K.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

339-344

EN

The work presents analyze of vertical acceleration curve of the body mass center (VACM characteristic) obtained by eleven athletes during on treadmill running with gradual rise velocity. The measurements are made by uniaxial accelerometer placed in loins part of trunk near the center of body mass. The chosen value of characteristics was calculated for every single run with applied velocity of treadmill The velocity of treadmill of every run was significantly correlated to mean values of VACM characteristics calculated for all subjects. For every athletes analyzed mean values of characteristics calculated separately for left and right steps were significantly different.

9

Analiza zachowań hamulców elektromagnetycznych ciernych w warunkach nieustalonych

Igielski J.

Przegląd Elektrotechniczny

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2006

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R. 82, nr 10

29-33

PL

W artykule przedstawiono zachowania elektromagnetycznych hamulców ciernych proszkowych i płytkowych przeznaczonych do zadawania obciążenia w badaniach układów napędowych małej mocy. Wykazano, że na przebieg rozwijanego przez takie hamulce momentu będą miały wpływ zmiany wartości obrotowej oraz charakter narastania prądu wzbudzenia. Szybszą reakcją na pobudzenie charakteryzowały się hamulce płytkowe.

EN

The article presents the behavior of plate and powder electromagnetic friction brakes that are meant to introduce load in the research on low-power mechatronic devices. It has been showed that the course of torque developed in these kinds of brakes will influence the rotational speed value. It will be also significant in the increase of the field current. The plate brakes have reacted much faster on the stimulation reaction than the powder brakes.