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    Wyświetlanie 1-9 z 9
    Tytuł:
    Influence of different types of surfaces on the results of running speed tests in young soccer players
    Autorzy:
    Jastrzębski, Zbigniew
    Bichowska, Marta
    Rompa, Paweł
    Radzimiński, Łukasz
    Dargiewicz, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/1055148.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Sprint tests
    exercise test
    football
    physical performance
    sport physiology
    Opis:
    The main purpose of this study was to determine the influence of different types of surfaces on the sprint test results. 33 male football players from two age categories - U15 and U18 - performed sprint tests (7 distances between 5 and 30m) and a 150m shuttle run test on three types of surfaces: natural grass [n], a synthetic surface [s] and a rubber surface [r]. The longer distance a player covers, the more likely it is that the importance of the type of running surface will be noticed. The rubber surface diminishes the negative effects of changeable factors on the reliability of the tests and therefore, in our opinion, is recommended for control tests and especially for longitudinal tests. Comparing the results of running speed tests performed on different surfaces and especially in different weather conditions is unjustified.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2014, 5, 1; 5-14
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time motion differences between Romanian and Polish high level young soccer players during 6 vs. 6 small sided games as an effect of training program
    Autorzy:
    Jastrzębski, Zbigniew
    Radzimiński, Łukasz
    Stefaniak, Arkadiusz
    Dragos, Paul
    Dumitrescu, Gheorghe
    Stępień, Piotr
    Mrozik, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1054944.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    heart rate response
    small-sided games
    time-motion analysis
    Opis:
    The purpose of this study was to present a time motion differences between Romanian and Polish young soccer players during 6 vs 6 small sided games. Young male football players from Schools of Sports Masters in Oradea (Romania) and Łódź (Poland) participated in the study. During the training session the players participated in four small-sided games 6 vs. 6 with goalkeepers (4 × 4 min, 3 min of active recovery). Heart rate responses and distance covered during small-sided games were compared. There were significant differences in the distance covered by both nationality players and age groups in reference to each intensity zone. Polish players coverd significantly longer distance compared with romanian soccer players. The results of motion abilities of young players from two countries with different training systems show that training programs can have a significant effect on adoptive abilities of the players.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2015, 10, 2; 55-61
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in blood morphology and chosen biochemical parameters in ultra-marathon runners during a 100-km run in relation to the age and speed of runners
    Autorzy:
    Jastrzębski, Zbigniew
    Żychowska, Małgorzata
    Jastrzębska, Maria
    Prusik, Krzysztof
    Prusik, Katarzyna
    Kortas, Jakub
    Ratkowski, Wojciech
    Konieczna, Anna
    Radzimiński, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2168346.pdf
    Data publikacji:
    2016-07-22
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    liver damage
    muscle fatigue
    long distance running
    age and speed differences
    total antioxidant status
    ultra-marathon
    Opis:
    Objectives The objective of the study was to reveal morphology, electrolyte and chosen biochemical parameters in terms of health risk in runners in reference to their age and running speed in the case of running a distance of 100 km, which occur after 12 h or 24 h of recovery. Material and Methods Fourteen experienced, male, amateur, ultra-marathon runners, divided into two age and two speed groups took part in the 100-km run. Blood samples for analyses indexes were collected from the ulnar vein just before the run, after 25 km, 50 km, 75 km and 100 km, as well as 12 h and 24 h after termination of the run. Results The sustained ultramarathon run along with the distance covered (p < 0.05) caused an increase in myoglobin (max 90-fold), bilirubin (max 2.8-fold) and total antioxidant status (max 1.15-fold), which also continued during the recovery. Significant changes in the number of white blood cells were observed with each sequential course and could be associated with muscle damage. The electrolyte showed changes towards slight hyperkalemia, but no changes in natrium and calcium concentrations. There were no significant differences between the age and speed groups for all the parameters after completing the 100-km run as well as after 12 h and 24 h of recovery. Conclusions Considering changes in blood morphology and chosen biochemical parameters in ultra-marathon runners during a 100-km run it can be stated that such an exhausting effort may be dangerous for human health due to metabolic changes and large damage to the organs. Negative metabolic changes are independent of age of an ultramarathon runner and occur both in younger (32±5.33 years) and older participants (50.56±9.7 years). It can be concluded that organ damage and negative metabolic changes during a 100-km run occur similarly in participants less experienced as well as in well trained runners. Int J Occup Med Environ Health 2016;29(5):801–814
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 5; 801-814
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CADASIL spowodowany stereotypową mutacją p.Arg207Cys w genie NOTCH3
    CADASIL caused by stereotyped p.Arg207Cys mutation of NOTCH3 gene
    Autorzy:
    Jastrzębski, Karol
    Obrembska, Magdalena
    Kępczyński, Łukasz
    Turoboś, Katarzyna
    Sobczyńska-Tomaszewska, Agnieszka
    Miller, Elżbieta
    Głąbiński, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1029714.pdf
    Data publikacji:
    2018
    Wydawca:
    Medical Communications
    Tematy:
    CADASIL
    NOTCH3
    choroba małych naczyń
    mózgowa autosomalna dominująca arteriopatia z podkorowymi zawałami i leukoencefalopatią
    p.Arg207Cys
    udar
    Opis:
    The most common hereditary cerebral small vessel disease, associated with strokes and vascular dementia, is known as cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL). CADASIL is caused by mutations of the NOTCH3 gene. Since most pathogenic mutations at the protein level result with cysteine being replaced with another amino acid or another amino acid being replaced with cysteine, they are referred to as stereotyped mutations. A 55-year-old male patient, suddenly affected by speech disturbances, was diagnosed with a sporadic case of CADASIL on the basis of radiological imaging, particularly an magnetic resonance imaging scan. The diagnosis was conclusively confirmed by genetic testing, which revealed one of the rarer mutations, located in one allele of the NOTCH3 gene, namely p.Arg207Cys, reflecting at the DNA level a transition changing cytosine to thymine in position 619. In magnetic resonance imaging, classical radiological changes were seen, along with the presence of microhaemorrhages in subcortical nuclei, which is an atypical clinical manifestation of the disease. Despite the advanced cerebral changes, the patient continued to be professionally active. Currently, no effective treatment for the condition is available.
    Najczęstszą genetycznie uwarunkowaną chorobą małych naczyń związaną z udarami i naczyniopochodnym otępieniem jest mózgowa autosomalna dominująca arteriopatia z podkorowymi zawałami i leukoencefalopatią (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy, CADASIL). Za CADASIL odpowiedzialne są mutacje genu NOTCH3. Większość patogennych mutacji na poziomie białka skutkuje zastąpieniem cysteiny innym aminokwasem bądź innego aminokwasu cysteiną, dlatego mutacje te nazywa się stereotypowymi. U 55-letniego pacjenta, u którego nagle wystąpiły zaburzenia mowy, zdiagnozowano sporadyczny przypadek CADASIL-u. Podstawą podejrzenia choroby był obraz radiologiczny, a zwłaszcza obraz uzyskany w badaniu rezonansem magnetycznym. Badanie genetyczne potwierdziło diagnozę. Ujawniono jedną z rzadszych mutacji – w jednym allelu genu NOTCH3 p.Arg207Cys, odpowiadającą na poziomie DNA tranzycji cytozyny w tyminę w pozycji 619. W badaniu rezonansem magnetycznym odnotowano klasyczne zmiany radiologiczne i obecność mikrokrwawień w jądrach podkorowych, co nie jest częstą manifestacją choroby. Mimo tak zaawansowanych zmian pacjent kontynuował pracę zawodową. W chwili obecnej nie jest znane skuteczne leczenie.
    Źródło:
    Aktualności Neurologiczne; 2018, 18, 1; 47-51
    1641-9227
    2451-0696
    Pojawia się w:
    Aktualności Neurologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automotive mr shock absorber behaviour considering temperature changes: experimental testing and analysis
    Autorzy:
    Jastrzębski, Łukasz
    Sapiński, Bogdan
    Kozieł, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/970615.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MR shock absorber
    temperature
    current
    coil resistance
    force
    energy
    Opis:
    This study investigates the automotive magnetorheological (MR) shock absorber behaviour in conditions of changing temperature. Its temperature-dependent behaviour was quantified between ambient and maximal operating temperatures of the device. Aspects addressed include the temperature dependence of the control coil resistance in the absorber, the influence of operating current level on control coil temperature and the temperature dependence of the absorber force response and energy dissipation in the system. The results of experiments enabled us to evaluate the mechanical performance of the absorber at varied temperatures.
    Źródło:
    Acta Mechanica et Automatica; 2020, 14, 1; 22-28
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ideal rectifier bridge converting the harvested energy of vibrations into electric energy to power an mr damper
    Autorzy:
    Sapiński, Bogdan
    Jastrzębski, Łukasz
    Kozieł, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1837924.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    energy harvesting
    rectifier bridge
    voltage
    current
    MR damper
    Opis:
    The newly developed ideal rectifier bridge equipped with four N-type MOSFETs and two rail-to-rail operational amplifiers is a part of a typical energy harvesting conditioning circuit responsible for the rectification stage in the system of converting the energy harvested from vibrations into electrical energy to power the MR damper. The only energy loss in the bridge is caused by the voltage loss in transistors’ channels. The first sections of the work summarises the structural design of the bridge, the simulation procedure under the RL load and by sine voltage inputs with predetermined frequency and amplitude range, and benchmarks the results against those obtained for the conventional bridge based on Schottky diodes. In the second section, the PCB prototype of the bridge is analysed, and measurement data are compiled. The third section reports on the laboratory testing of the developed bridge converting the harvested energy in an MR damper-based vibration reduction system.
    Źródło:
    Acta Mechanica et Automatica; 2020, 14, 4; 198-205
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An experimental device for evaluation of hydrogen sorption
    Autorzy:
    Leyko, Jacek
    Surmiński, Krzysztof
    Batory, Damian
    Jastrzębski, Krzysztof
    Kaczmarek, Łukasz
    Kaczorowski, Witold
    Kula, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27311742.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    demonstrator
    experimental device
    hydrogen storage
    sorption capacity
    bed sorption
    Opis:
    Hydrogen storage for the purposes of the automotive industry in a form other than under high pressure or cryo conditions has been under careful investigation by researchers over past decades. One of the arising methods is the usage of powdered/granulated beds that contain metal hydrides and/or carbon materials to take advantage of the “spillover” phenomenon. Handling and characterization of such material can be troublesome, which is why the experimental setup needs careful investigation. The apparatus for the analysis of hydrogen sorption/desorption characteristics has been successfully designed and described based on the constructed unit within the scope of this article. The full functionality of that setup covered fuelling the bed as well as the examination of sorption/desorption potential. Moreover, the proposed experimental device can clarify many uncertainties about further development and optimization of hydrogen storage materials.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 2; 367--376
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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