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    Wyświetlanie 1-6 z 6
    Tytuł:
    Wprowadzenie do predykcji z wykorzystaniem sztucznych sieci neuronowych i metod statystycznych
    An introduction to prediction with the use of artificial neural networks and statistical methods
    Autorzy:
    Nawrocka, Monika
    Drozd, Miłosz
    Maszczyk, Adam
    Gołaś, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/459999.pdf
    Data publikacji:
    2015
    Wydawca:
    Fundacja Pro Scientia Publica
    Tematy:
    predykcja
    analiza statystyczna
    regresja
    optymalizacja
    szeregi czasowe
    sieci neuronowe
    prediction
    statistical analysis
    regression
    optimization
    time series
    neural networks
    Opis:
    Podejście statystyczne umożliwia prowadzenie prognoz zdarzeń lub procesów. Wyróżnia się modele regresyjne liniowe i nieliniowe, modele szeregów czasowych oraz modele neuronowe. Predykcja określa przewidywanie przyszłych cech statystycznych zdarzeń losowych, które można zmierzyć. Wyznacza prognozy dla maksymalizacji. Korzyści, jakie wynikają z prognozowania, to: porównywanie, grupowanie, analizowanie zmienności, określania trendów oraz wyznaczania prognoz uzyskanych wyników, z wykorzystaniem optymalnego wektora zmiennych niezależnych predyktorów do wyciągania sukcesywnych wniosków.
    The statistical approach allows the introduction of predictions of events or processes. Among these are linear and nonlinear regression models, time series models and neural models. Prediction is defined by the anticipation of future statistical characteristics of random events which can be measured, and designates forecasts for maximizing. The benefits which stem from prediction are comparison, grouping, analysis of variation, determinion of trends and setting forecasts of the results obtained with the use of an optimal vector of independent variables predictors for drawing successive conclusions.
    Źródło:
    Ogrody Nauk i Sztuk; 2015, 5; 203-211
    2084-1426
    Pojawia się w:
    Ogrody Nauk i Sztuk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the load for peak power and peak velocity development during resisted sprinting
    Autorzy:
    Matusiński, Aleksander
    Gołaś, Artur
    Zając, Adam
    Nitychoruk, Magdalena
    Maszczyk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1933035.pdf
    Data publikacji:
    2021-06-30
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    developing strength
    muscle power
    sprint training
    sprinting speed
    Opis:
    Introduction: Resistance towing is perhaps the most specific form of developing strength and power in muscles involved directly during the start, acceleration and at maximum speed. Resisted sprint training may involve towing a sled which provides an overload through the friction between the sled and ground surface or a modern advanced training device which uses drag technology to provide fully controlled resistance during the movement, such as the 1080 Sprint. The main objective of the study was to evaluate the optimal loading for the development of power in the engine assisted drag technology system SPRINT 1080. Material and methods: We evaluated the changes in running velocity and the generated force and power during resisted sprints over 30m with a load of 1, 3, 6, 9, 12 and 15 kg. Seven male sprinters with national and international experience participated in the study. Their average age, body mass and body height were 22.2 ± 2.4 years, 77.43 ± 4.63 kg, and 178.6 ± 3.2 cm, respectively. All athletes performed six 30 m sprints with 5 min rest intervals in between. The first sprint was performed without additional resistance, while the remaining 5 were performed in an random order with additional resistance of 3, 6, 9, 12 and 15 kg. After receiving a verbal signal, the participant started at will from a semi crouched position. During the resisted sprint trials, the time [s] and the following variables were recorded in peak values: power output [W], generated force [N], and sprinting velocity [m/s]. Results: Our results show that loading with 6 kg decreased sprinting velocity by 9.37% while the generated horizontal power increased by 31,32%. The 6 kg loading on the Sprint 1080device corresponded to 8% body mass, yet as mentioned before the baseline results were not fully free sprinting as the tested athletes reached velocities 0.5-0.6 m/s greater without the harness. Conclusion: Taking into account this fact, our results seem to confirm previous findings, that external loads between 8 and 13% may be optimal for improving power and sprinting speed at the same time.
    Źródło:
    Physical Activity Review; 2021, 1, 9; 128-134
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of bench press at a specified movement tempo on post-exercise testosterone and cortisol levels
    Autorzy:
    Studencki, Marcin
    Ignatjeva, Angelina
    Nitychoruk, Magdalena
    Gołaś, Artur
    Smółka, Wojciech
    Maszczyk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1933110.pdf
    Data publikacji:
    2021-11-03
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    testosterone
    cortisol
    movement tempo
    bench press
    Opis:
    Body response is a key element of the periodization of any training unit. The main control systems in the human body are the nervous and endocrine systems. The study aims to examine the effect of bench press at a specified movement tempo on post-exercise blood testosterone and cortisol levels. The study involved 16 men (experience in resistance training 5.5 ± 1.3 years, aged 24 ± 2 years, body weight 86.1 ± 7.2 kg, and 1RM 125 ± 17 kg). The first stage of the test focused on determining the maximum force based on a single bench press with the highest possible external load (1RM). The second stage included the main test, i.e. bench press. The participants were asked to perform 5 sets successively, with an external load of 70% of an individual 1RM and as many repetitions as possible. The tempo of the exercise was precisely specified. The metronome was used to set a bench press tempo. The movement tempo included time under tension (TUT) 2/0/2/0. TUT means the total time of muscle tension during one repetition. The tests showed significant changes in cortisol levels recorded 30 minutes after exercise, amounting to 13.75 (±4.60) at F=9.16 and p=0.006. and 60 minutes after exercise, amounting to 11.37 (±4.17) at F=19.46 and p=0.0002. No significant statistical values were found for testosterone levels. This study brings additional evidence of the importance of hormonal responses in muscle strength training.
    Źródło:
    Physical Activity Review; 2021, 2, 9; 111-119
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of power on agility, linear speed and change of direction deficit in female soccer players
    Autorzy:
    Fischerova, Patricia
    Krosta, Roksana
    Gołaś, Artur
    Terbalyan, Artur
    Nitychoruk, Magdalena
    Maszczyk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1933017.pdf
    Data publikacji:
    2021-06-23
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    COD deficit
    change of direction
    power
    strength
    agility
    straight linear speed
    soccer
    female
    peak power
    Opis:
    Introduction: The aim of the study was to examine relationships between power of the lower limb and agility, speed, and change of direction (COD) deficit in professional female soccer players. Material and methods: Thirty-three elite Polish Extraliga league soccer players (aged 22 ±5 years; body height 166 ± 4 cm; body weight 58 ± 8 kg) performed the following fitness tests: lower limb muscle power (Leg Press, Half Squat, Counter Movement Jump), straight linear speed (SLS 20 m), and COD speed ( Zig-Zag test, COD deficit). Using the median value as a reference, the players were subdivided into two groups (n=17; n=16) according to their LP, HS 60% 1RM, CMJ (High values below median = stronger group and Low = weaker group ). Results: The COD deficit was calculated as the difference between the 20m speed and the Zig-Zag test. The stronger group was better than the weaker group in SLS 20m (p<0.05; ES=1.23; 0.83; 0.93), but in the Zig-Zag agility test, the difference in the results was not statistically significant (p>0.05; ES=0.48; 0.34; 0.34) and this affected the COD deficit, which was higher (p<0.05; ES=0.9; 0.73; 0.72). The most important finding was that the stronger group had a higher COD deficit and its improvement (reduction) occurs only if the results of the agility test are improved (through agility training) [Ydeficit All groups=0.10+0.87* 20m - 0.83* Zig-Zag]. Increasing power (HS, LP) lead to the improvement in SLS p<0.05, not to COD abilities. Conclusion: This can be useful for coaches during agility training and to improve COD deficit in soccer players and women in general.
    Źródło:
    Physical Activity Review; 2021, 1, 9; 109-116
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in Bar Velocity and Muscular Activity During the Bench Press in Relation to the Load Lifted
    Autorzy:
    Gołaś, Artur
    Maszczyk, Adam
    Wilk, Michał
    Statsny, Petr
    Petr, Miroslav
    Wróbel, Grzegorz
    Król, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/1054723.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    EMG
    bar velocity
    sticking region
    Opis:
    The purpose of the study was to determine velocity changes in relation to the load lifted along with their muscular activity. Twenty athletes representing different sport disciplines, familiar with the flat bench press took part in the research project. The ANOVA analysis revealed a significantly higher effect on range of mean velocity (F = 128.34; η2 = 1.22 with p = 0.001) and maximal velocity (F = 7 3.31; η 2 = 0 .81 w ith p = 0 .001) t o m easured l oads ( 70÷100% 1-RM) i n a scending p hase. Tukey’s p ost-hoc t ests revealed a statistically significant difference between 70% and 100% 1-RM loads, in mean velocity with p = 0.001 and maximal velocity with p = 0.001. Similarly the results revealed a statistically significant difference between 80% and 100% 1-RM loads in mean velocity (p = 0,012) and maximal velocity (p = 0,021) during the ascending phase. Relationship between velocity and the muscles activity indicates that the anterior deltoid and latissimus dorsi muscles show synergy and a significant relationship for loads 90 and 100% 1-RM. The triceps brachii muscle shows a higher relationship with velocity of the barbell for loads 70% and 80%, then the relationship of the pectoralis major muscle with velocity only for 90% 1-RM.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2015, 11, 3; 95-101
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endocrine Responses to Physical Training and Tribulus Terrestris Supplememtation in Middle-Age Men
    Autorzy:
    Wilk, Michał
    Michalczyk, Małgorzata
    Chycki, Jakub
    Czuba, Miłosz
    Roczniok, Robert
    Gołaś, Artur
    Zając, Adam
    Maszczyk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1054899.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    growth hormone
    insulin-like growth factor
    steroidal saponins
    supplementation
    testosterone
    Opis:
    The aim of this study was to evaluate the effects of steroidal saponin supplementation on blood concentration of T, GH and IGF-1. The research involved 14 men between the age of 45 and 60 years. The duration of the experiment was 12 weeks. There were two series of laboratory tests. Independent tests were conducted at the beginning and after 12 weeks of the intervention. A two-way repeated measures ANOVA revealed a statistically significant effect of the intervention on the following variables: T-Ch (η2 = 0.542), HDL-Ch (η2 = 0.522), LDL-Ch (η2 = 0.587), T (η2 = 0.603), IGF-1 (η2 = 0.512) and GH (η2 = 0.621). Thus, FFM significantly increased while TBF and BM decreased in comparison to pre-intervention levels. The analyzed results indicate that treatment or supplementation of individual hormone deficiencies can be a successful form of counteracting the aging process. Nevertheless, the effects of TT supplementation on the concentration of T as well as GH and IGF-1, requires further studies, especially in middle-aged and older subjects, along with different exercise programs. The analyzed results indicate that treatment or supplementation of individual hormone deficiencies can be a major form of counteracting the aging process.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2016, 13, 1; 65-71
    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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