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    Wyświetlanie 1-5 z 5
    Tytuł:
    Concurrent validity and reliability of proprietary and open-source jump mat systems for the assessment of vertical jumps in sport sciences
    Autorzy:
    Pueo, B.
    Jimeney-Olmedo, J. M.
    Lipińska, P.
    Buśko, K.
    Penichet-Tomas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307394.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sportowiec
    skoki
    sport
    test
    athlete
    jump
    open-hardware
    sports
    switch
    Opis:
    Vertical jump tests are used to assess lower-limb power of athletes in sport sciences. Flight time measurement with jump-mat systems is the most common procedure for this purpose. The aim of this study was to analyze the concurrent validity and reliability of two proprietary systems (Globus and Axon) and an open-source system (Chronojump). Methods: A conditioning electric circuit governed by a controlled wave generator is designed to substitute athletes jumping on a physical mat. In order to look for possible differences associated to timekeeping by each microcontroller device, all three systems are fed by the circuit simultaneously. Results: Concurrent validity was high for the three systems. Standarized typical error of estimate (TEE) was trivial, according to MBI interpretation, as well as perfect Pearson correlation coefficient. Reliability was assessed using coefficient of variation of flight time measure, resulting in 0.17–0.63% (0.05–0.12 cm) for Globus, 0.01% (0.09 cm) for Chronojump and 5.65–9.38% (2.15–3.53 cm) for Axon. These results show that all jump-mat system produced nearly identical measures of flight time so they can be considered valid and reliable for practical purposes. In comparison, Chronojump showed the best performance whereas Axon showed enough variability and disagreement to pose a problem in testing elite athletes. Conclusions: These experiments show that open-source jump mats are as valid and reliable as their proprietary counterparts at a lower cost. Therefore, practitioners can be confident in using Globus or Chronojump systems to test athletes’ jump height because of their negligible errors and Axon system to monitor general population.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 3; 51-57
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leg stiffness during phases of countermovement and take-off in vertical jump
    Autorzy:
    Struzik, A.
    Zawadzki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306980.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    basketball players
    counter-movement jump
    quasi-stiffness
    koszykówka
    ruch
    sportowiec
    Opis:
    With respect to cyclic movements such as human gait, running or hopping, leg stiffness is a little variable parameter. The aim of this study was to investigate changes in leg stiffness during the phase of countermovement and take-off when performing a single maximum counter-movement jump. Kistler force plates and a BTS SMART system for comprehensive motion analysis were employed in the study. The study covered a group of 12 athletes from university basketball teams. Leg stiffness was calculated in those parts of countermovement and take-off phases where its level is relatively constant and the relationship F(Δl) is similar to linear one. Mean total stiffness (±SD) in both legs in the countermovement phase amounted to 6.5 ± 1.5 kN/m, whereas during the take-off phase this value was 6.9 ± 1 kN/m. No statistically significant differences were found between leg stiffness during the countermovement phase and takeoff phase in the study group at the level of significance set at α = 0.05. This suggests that the leg stiffness in phase of countermovement and phase of take-off are much similar to each other, despite different function of both phases. Similar to cyclic movements, leg stiffness turned out relatively constant when performing a single vertical jump. There are also reported statistically significant correlations between body mass, body height, length of lower limbs and leg stiffness. The stiffness analysed by the authors should be understood as quasi-stiffness because the measurements of ΔF(Δl) were made during transient states where inertia and dumping forces are likely to affect the final result.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 2; 113-118
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Dilemma of Spiritual and Moral Personal Development of Modern Student-Athletes
    Dylemat duchowego i moralnego rozwoju osobistego współczesnego studenta-sportowca
    Autorzy:
    Zakolodnaya, Elena
    Powiązania:
    https://bibliotekanauki.pl/articles/565495.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
    Tematy:
    spirituality
    morality
    personal development
    athlete
    student
    religion
    culture
    duchowość
    moralność
    kształtowanie osobowości
    sportowiec
    religia
    kultura
    Opis:
    The practice of doing sports during adolescent years abounds in situations which may cause unacceptable behavior, such as rudeness, selfishness, vanity, etc. Observations of coaches’ work reveal that athletes’ planned and systematic spiritual and moral education is often neglected in the training process. However, preventing and combating negative manifestations in sport is possible primarily with the help of spiritual and moral education and one of its most important missions, i.e. building beautiful human relationships. The most helpful tool in education seems to be a proper analysis of parenting situations that form the basis for metaphorical work.
    W praktyce uprawiania sportu zdarzają się sytuacje, które mogą wywołać nieakceptowane zachowania (grubiaństwo, egoizm, próżność i inne). Obserwacje badawcze pracy trenerów wskazują, iż w procesie treningowym nie poświęca się należytej uwagi planowemu i systematycznemu wychowaniu sportowców. W działaniach profilaktycznych w zwalczaniu negatywnych zachowań w sporcie powinno się stosować przede wszystkim duchowo-moralne wychowanie, którego jednym z ważniejszych celów jest pielęgnowanie pozytywnych relacji interpersonalnych. Ponadto, ważnym środkiem wychowawczym jest dokonanie analizy sytuacji pedagogicznych, które mogą być oparte na uniwersalnym przesłaniu wielu utworów literackich. Umiejętność zastosowania w wychowaniu sportowym dydaktycznych funkcji przypowieści może wpłynąć na osiągnięcie większej efektywności w procesach edukacyjno-wychowawczych i treningowych, wypracowanie odporności na niestandardowe sytuacje wychowawcze (często konfliktowe), które są tak charakterystyczne dla aktywności sportowej i związanych z nią ciągłych przeciążeń i stresów.
    Źródło:
    Rozprawy Społeczne; 2015, 9, 2; 14-18
    2081-6081
    Pojawia się w:
    Rozprawy Społeczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between lower limbs kinematic variables and effectiveness of sprint during maximum velocity phase
    Autorzy:
    Struzik, A.
    Konieczny, G.
    Grzesik, K.
    Stawarz, M.
    Winiarski, S.
    Rokita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307199.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    prędkość kątowa
    czujniki inercjalne
    docieranie
    sportowiec
    angular velocity
    inertial sensors
    motion pattern
    running
    young athletes
    Opis:
    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.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 131-138
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of maximal isometric torque and muscle fatigue index of the knee muscles in male athletes
    Autorzy:
    Danek, Janusz
    Wojtasik, Wojciech
    Szulc, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/306497.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sportowiec
    wskaźnik zmęczenia
    mięśnie
    staw kolanowy
    male athletes
    maximal isometric torque
    fatigue index
    knee joint
    muscles
    Opis:
    The aim of the paper was to analyse variables related to the force and fatigue of knee muscles in the right and left lower limbs among 17 male athletes. Methods: For both muscle groups, maximal isometric torque (Fmax) was determined with the use of Biodex System 4 Pro and the values of muscle fatigue index (FATI1–3) were calculated. Results: A significant difference was observed between the groups of short- and long-distance runners in the values of all fatigue indices of knee joint extensor muscles in the right limb. In turn, between the groups of athletes who had trained for 2–4 years or for 4.5–7 years and the group who had trained for 7.5–13 years, significant differences were observed in the values of all fatigue indices of knee joint flexor muscles in the right limb. The group training for 3–12 hours per week and the group training for 12.5–18.0 hours per week in the sports club differed significantly in the value of the maximal isometric torque of knee joint flexor muscles in the right limb and in the values of some fatigue indices (FAT1, FAT3) for knee joint flexor muscles in the right limb. The study reported numerous positive correlations between the assumed characteristics and the investigated variables of knee joint extensor and flexor muscles in the right and left lower limbs. Conclusions: Athletes present certain changes in variable values and positive correlations between some characteristics and investigated variables of selected knee muscles.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 31-37
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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