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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effects of creatine hydrochloride supplementation on physical performance and hormonal changes in soldiers
    Autorzy:
    Tayebi, Mohammad Milad
    Yousefpour, Mitra
    Ghahari, Laya
    Powiązania:
    https://bibliotekanauki.pl/articles/1932984.pdf
    Data publikacji:
    2021-05-19
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    creatine
    performance
    HCl
    hormones
    Opis:
    Purpose: The aim of this study was to examine the effects of 2 weeks of creatine hydrochloride (CrHCl) supplementation on physical performance and hormonal changes in army soldiers. Materials: Eighteen male army soldiers were randomly assigned in a double-blind fashion to either a CrHCl (n=9) or placebo (Pl) (n=9) groups. CrHCl group costumed 3g of creatine per day, whereas Pl group was given dextrose. Before and after supplementation period, the subjects performed a battery of performance tests including one repletion maximum (1RM) of bench press and back squat, vertical jump (VJ) and Wingate anaerobic test. In addition, blood samples were obtained to determine changes in testosterone and cortisol concentrations per and post supplementation. Results: There were significant increases in VJ, peak and mean power, and 1RM back squat test following the 2 weeks of CrHCl supplementation (p < 0.05) without any significant change for the Pl group. In addition significant changes were observed in testosterone and cortisol concentrations from before to after supplementation in CrHCl group (p < 0.05) and compared with Pl group (p=0.001). Conclusions: In conclusion, the present study indicates that CrHCl supplementation can improve VJ, power performance, 1RM back squat and hormonal changes in army soldiers.
    Źródło:
    Physical Activity Review; 2021, 1, 9; 93-99
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationships between the components of physical fitness and athletic performance in youth pole vaulters: a prospective study in a tunisian secondary school setting
    Autorzy:
    Derbali, Chawki
    Powiązania:
    https://bibliotekanauki.pl/articles/1901387.pdf
    Data publikacji:
    2020-12-31
    Wydawca:
    Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
    Tematy:
    adolescents
    physical fitness
    performance
    pole vault
    Opis:
    This study examined relationships between the components of physical fitness and athletic performance in youth pole-vaulters in a secondary school setting. Twenty-five adolescents of both genders, between the ages of 15 and 18, participated in the study. This case study was grounded on qualitative and quantitative approaches of data analysis, measuring physical abilities self-assessment based on the questionnaire developed by Borg et al. [11] and measuring high-performance effect linking age and gender with the levels of the pole vault performance. The results indicate that, overall, the six dimensions of fitness (coordination, strength, flexibility, speed, endurance, and body self-image) are correlated with physical fitness (r varies between 0.29 and 0.65, p<0.05). The significance is very high in teenage boys for perceived strength and perceived endurance respectively (r=0.61, p <0.001 and r=0.65, p<0.001), whereas in teenage girls global physical fitness is highly correlated with endurance (r=0.63, p<0.001). Moreover, while endurance and flexibility have become a determinant of performance in the girl group in the perceived physical fitness category, strength and perceived speed are the most important components in the boy group. An effect of age was only considered for strength, endurance and perceived fitness. No effect of body self-image on pole vault performance was identified, with non-significant correlation in the two genders, girls and boys respectively (r=0.11, r=0.16). The significant role of physical fitness levels in determining motor exercise performance in adolescence may have further implications for gender roles and talent prospecting as well as potential physical condition benefits for exploring new sports.
    Źródło:
    Journal of Physical Education & Health - Social Perspective; 2020, 9, 16; 48-55
    2084-7971
    Pojawia się w:
    Journal of Physical Education & Health - Social Perspective
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perceived difficulties in sports exercises: typical assessment of specific physical abilities
    Autorzy:
    Derbali, Chawki
    Matoussi, Fathi
    Elloumi, Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/1902578.pdf
    Data publikacji:
    2019-12-31
    Wydawca:
    Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
    Tematy:
    perceived difficulty
    assessment
    physical abilities
    performance
    Opis:
    We have investigated the relationship between performance in sports exercises and perceived difficulties inphysical ability tasks for boys and girls. In order to assess physical abilities in sport, we conducted experimentsconcerning methods for self-evaluating the difficulty of physical ability required in sports exercises throughimplementation of creative vaulting tasks in addition to Eurofit and Evareg tests. Based on a hypothesis thatspecific physical abilities could predict performance in physical education for boys and girls, we distinguishedthe relationship between genders concerning perceived difficulty for varied ability tasks. Although sportingexercises performance was high among boys rather than girls, there was no significant difference in perceiveddifficulties of physical tasks between genders. We highlight how perceived difficulties among students appears tohave resulted in higher student motivation levels, and increased desire to improve performance for more effectivelearning and teaching experience. We recommend that methods of perceiving difficulties in sport exercises needmore exploration for better practices
    Źródło:
    Journal of Physical Education & Health - Social Perspective; 2019, 8, 14; 11-17
    2084-7971
    Pojawia się w:
    Journal of Physical Education & Health - Social Perspective
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie wydajności emulatora i fizycznego urządzenia z systemem Android w oparciu o algorytm szachowy
    Performance comparison of an emulator and physical Android mobile device based on chess algorithm
    Autorzy:
    Litkowski, Kamil
    Smołka, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/98048.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Lubelska. Instytut Informatyki
    Tematy:
    emulator
    Android
    wydajność
    performance
    Opis:
    W artykule omówione zostały zagadnienia dotyczące różnic wydajności między emulatorami Android Emulator w wersji 26.1.4 i BlueStacks App Player 3 oraz fizycznymi urządzeniami mobilnymi z systemem Android. Wydajność zostaje mierzona poprzez pomiar czasu wykonywania algorytmu szachowego. W artykule opisane zostały dotychczasowe badania związane z daną tematyką. Przedstawiona została także metoda badań, wyniki badań bazujących na algorytmach szachowych oraz wnioski z nich płynące.
    Article discusses performance differences of emulators Android Emulator version 26.1.4 and BlueStacks App Player 3 and physical devices with Android platform. Performance is measured by the chess algorithm execution time. Article also describes previous research related to this subject. The article also presents the used research methods, results of research based on chess algorithms and conclusions.
    Źródło:
    Journal of Computer Sciences Institute; 2018, 6; 77-81
    2544-0764
    Pojawia się w:
    Journal of Computer Sciences Institute
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Classification System for Characterization of Physical and Non-Physical Work Factors
    Autorzy:
    Genaidy, A.
    Karwowski, W.
    Succop, P.
    Kwon, Y. G.
    Alhemoud, A.
    Goyal, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/89768.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    performance
    work-factor system
    classification
    klasyfikacja
    system pracy
    wydajność
    Opis:
    A comprehensive evaluation of work-related perfomance factors is a prerequisite to developing integrated and long-term solutions to workplace performance improvement. This paper describes a work-factor classification system that categorizes the entire domain of workplace factors impacting performance. A questionnaire-based instrument was developed to implement this classification system in industry. Fifty jobs were evaluated in 4 different service and manufacturing companies using the proposed questionnaire-based instrument. The reliability coefficients obtained from the analyzed jobs were considered good (.589 to .862). In general, the physical work factors resulted in higher reliability coefficients (.847 to .862) than non-physical work factors (.589 to .768).
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 535-555
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Pilot Study on Italian Eventing Prospective Olympic Horse Riders Physiological, Anthropometrical, Functional and Asymmetry Assessment
    Autorzy:
    Demarie, Sabrina Demarie
    Galvani, Christel
    Donatucci, Bruno
    Gianfelici, Antonio
    Powiązania:
    https://bibliotekanauki.pl/articles/2026873.pdf
    Data publikacji:
    2022-03-31
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    elite athletes
    physical evaluation
    asymmetry
    performance
    Opis:
    The purpose of the study was to measure anthropometry, isometric force, balance, functional movement quality and asymmetries and peak oxygen uptake of prospective Rio 2016 Olympic Games Eventing horse riders (five males and two females: age 26-41 years, height 173.0 ± 8.9 cm, weight 66.4 ± 11.1 kg, BMI 22.0 ± 1.8, FEI ranking 33-409). Mean and maximal isometric of the hands were approximately 45 kg, and 50 kg, respectively. Total maximal isometric force of the lower limb resulted 372.6 kg for the extensor muscles, and approximately 58 kg for the adductor muscles. Mean composite functional movement score was 14.1, mean Bunkie score 3.4. Y-balance score 93.1 ± for the left side and 90.9 for the right one. V̇O2peak values ranged between 2.4 and 4.2 l·min-1 and 46.8 and 59.7 ml·kg-1·min-1. The oldest and more experienced athletes had a greater postural control on the anterior direction. The athletes with a superior FEI ranking had a greater postural control. Subjects had high maximal isometric strength of the hands and lower limbs, good physical functions parameters, balance and maximal aerobic power and few muscular strength and balance asymmetries.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2022, 37; 77-88
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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