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    Wyświetlanie 1-6 z 6
    Tytuł:
    Evaluation of selected biomechanical parameters in female team sports players
    Autorzy:
    Pietraszewski, B.
    Struzik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307048.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    countermovement jump
    drop jump
    RSI
    torque
    vertical jump
    skoki
    trening
    biomechanika
    Opis:
    The aim of this research was to evaluate the biomechanical parameters of lower limbs and their influence on height of vertical jump. The research was conducted on a group of females practicing basketball and volleyball. The following equipment was used during the experiment: a force plate by Kistler, a Biometrics electrogoniometer and a specially designed chair to measure static torque by OPIW Opole. The results indicated that the jumping abilities of the examined athletes were poor. No statistically significant correlations were observed between knee static torque and heights of vertical jumps: CMJ and DJ. The authors suggest modification of the McClymont index (RSI) to evaluate the selection of platform height during plyometric training. Such modification would enable better choice of loads and better training control of the subject.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 4; 103-108
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clinical implications of Squat Jump and Countermovement Jump among Young Females of United Arab Emirates : Comparative Biomechanical Analysis
    Autorzy:
    Saad Salama, Tasnim Yahia
    Harb Abdelkawi Ali, Maryam Abdelkawi
    Kandakurti, Praveen Kumar
    Bose, Meruna
    Muthukrishnan, Ramprasad
    Hazari, Animesh
    Powiązania:
    https://bibliotekanauki.pl/articles/32443965.pdf
    Data publikacji:
    2024
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    squat jump
    countermovement jump
    young females
    biomechanical analysis
    United Arab Emirates
    Opis:
    Background: The countermovement jump (CMJ) and the squat jump (SJ) are two vertical jump (VJ) tests widely used to evaluate lower limb muscle strength and power, respectively. Biomechanical analysis of SJ and CMJ could help to predict the strength associated musculoskeletal clinical disorder which is most commonly seen among females such as patellofemoral pain syndrome, osteoarthritis etc. Therefore, the purpose of the study was to conduct and compare the biomechanical analysis of squat and countermovement jump using advanced motion analysis system and compare the changes among sedentary and active young females of the United Arab Emirates. Methodology: The experimental study was conducted at the Thumbay Physical Therapy and Rehabilitation Hospital, Gulf Medical University, Ajman, UAE. A total of 60 sedentary females, and 60 active females within age group 18-30 years were recruited under the convenience sampling method. The participants were randomly divided into two subgroups of 30 each for SJ and CMJ jump analysis respectively for sedentary and active group. Results: There was a statistically significant difference between the CMJ and SJ among the young females in UAE population (p < 0.05). The outcome variables such as jump height, and lower limb joint force were significantly reduced for SJ and CMJ in the sedentary group compared to active group. Majority of the variables showed moderate to severe effect size. Conclusion: Based on the study findings, it could be suggested that the “Sedentary Group” in the present study had poor muscle strength and ability to sustain the stress on the lower limb joints as also shown with lower mean total work. Since we have conducted the study on healthy non-athletes’ young females, the data could be used for further clinical correlation and comparison for lower limb muscle strength and power.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2024, 45; 65-74
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower extremity power in female soccer athletes : a pre-season and in-season comparison
    Autorzy:
    Pietraszewski, B.
    Siemieński, A.
    Bober, T.
    Struzik, A.
    Rutkowska-Kucharska, A.
    Nosal, J.
    Rokita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307077.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    skoki
    trening plyometryczny
    energia
    biomechanika
    countermovement jump
    drop jump
    plyometric training
    relative power
    Opis:
    Purpose: Lower extremity power is an important physical capacity of a soccer athlete. Power represents, and can be modified by, the training of strength and speed. Pre-season and in-season training differs in the relative emphasis on these two quantities. It is nevertheless desirable that the mechanical power remain the same or become higher during the in-season period. The purpose of this study was to identify changes in quantities related to “explosive strength” and to check whether, in collegiate female soccer players, pre- and inseason lower extremity power will remain unaltered. Methods: Twenty collegiate female soccer players, representing all field positions, participated. Lower extremity power was assessed by a series of drop jumps executed from four different heights (15, 30, 45, and 60 cm). Mechanical power was calculated using subject’s mass, jump height, and acceleration due to gravity. This value was further normalized by body mass of each athlete to obtain the relative (or normalized) mechanical power. Results: The normalized lower extremity mechanical power was highest when landing from the 30 cm height for both pre- and inseason periods. However, contrary to expectations, it turned out lower during the in-season than during the pre-season test, even though no significant differences were found between the corresponding jump heights. Conclusions: It is concluded that altered, perhaps inadequate, training strategies were employed during the in-season period. Besides, advantages of adding the relative mechanical power as a season readiness indicator are underlined compared with relying on the jump height alone.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 129-135
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of potential elastic energy during the countermovement phase of a vertical jump based on the force-displacement curve
    Autorzy:
    Struzik, Artur
    Zawadzki, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/306373.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    skoki
    elastyczność
    sztywność
    rozciąganie
    countermovement jump
    elasticity
    quasi-stiffness
    stretch-shortening cycle
    Opis:
    Purpose: One inconvenience in finding experimental evidence for the relationship between potential elastic energy and vertical jump height is the difficulty of estimating the value of the stored potential elastic energy. Therefore, the aim of this study is to present a simple method of estimating the potential elastic energy stored by lowering the center of mass during the countermovement phase of a vertical jump. Methods: The research was conducted on 30 able-bodied male university students (age: 20 years, body height: 183.1 ± 7.9 cm, body mass: 80.3 ± 10.4 kg). Each participant performed 10 single countermovement jumps with arms akimbo to maximal height. Measurements employed a Kistler force plate. The value of potential elastic energy was estimated based on the curve of dependence of the ground reaction force on the vertical displacement of the jumper’s center of mass. Results: The mean value (±SD) of potential elastic energy collected due to lowering of the center of mass during the countermovement phase of a vertical jump was 183 ± 69 J. 24.3% of this value can be considered the part of the potential elastic energy (44 ± 21 J) that comes from the transformation of kinetic energy. The total change in gravitational potential energy due to lowering the center of mass was 240 ± 58 J. Conclusions: This estimation of potential elastic energy is only general and rough. However, certain estimations of potential elastic energy may offer some insight into the phenomenon relating vertical quasi-stiffness and the ability to store potential elastic energy with vertical jump height.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 1; 153-160
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of force-length curve for determination of leg stiffness during a vertical jump
    Autorzy:
    Struzik, A.
    Zawadzki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306593.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    asymetria
    sprężystość
    kwazizerowa sztywność
    koszykówka
    asymmetry
    countermovement jump
    elasticity
    quasi-stiffness
    basketball players
    Opis:
    Purpose: The aim of this study was to present the methodology for estimation of a leg stiffness during a countermovement jump. The question was asked whether leg stiffness in the countermovement and take-off phases are similar to each other as demonstrated in previous reports. It was also examined whether the stiffness in left lower limb is similar to the one in right lower limb. Methods: The research was conducted on 35 basketball players. Each participant performed three countermovement jumps with arm swing to the maximum height. Measurements employed a Kistlerforce plate and a BTS SMART system for motion analysis. Leg stiffness (understood as an inclination of the curve of ground reaction forces vs. length) was computed for these parts of countermovement and take-off phases where its value was relatively constant and F(∆l) relationship was similar to linear. Results: Mean value (±SD) of total stiffness of both lower limbs in the countermovement phase was 7.1 ± 2.3 kN/m, whereas this value in the take-off phase was 7.5 ± 1 kN/m. No statistically significant differences were found between the leg stiffness in the countermovement and the take-off phases. No statistically significant differences were found during the comparison of the stiffness in the right and left lower limb. Conclusions: The calculation methodology allows us to estimate the value of leg stiffness based on the actual shape of F(∆l) curve rather than on extreme values of ∆F and ∆l. Despite different tasks of the countermovement and the take-off phases, leg stiffness in these phases is very similar. Leg stiffness during a single vertical jump maintains a relatively constant value in the parts with a small value of acceleration.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 163-171
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The reliability and minimal detectable change of various physical performance tests among youth basketball players
    Rzetelność i czułość baterii testów sprawności motorycznej koszykarzy w kategorii 'kadet'
    Autorzy:
    Krawczyk, Marcin
    Siedlik, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/2098308.pdf
    Data publikacji:
    2022-07-29
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    ¾ Court Test
    Lane Agility Test
    skok bez zamachu
    zeskok
    sprawność fizyczna
    koszykówka młodzieżowa
    Countermovement Jump
    Drop Jump
    physical performance
    youth basketball
    Opis:
    W trakcie meczu koszykówki główne czynności ruchowe, które wykonują zawodnicy to: bieg, skoki, bieg sprinterski oraz zmiany kierunku biegu. Wymienione czynności ruchowe powinny stanowić główną treść testów sprawności motorycznej w koszykówce. Rzetelność oraz zdolność do wykrywania minimalnej zmiany sprawności (Minimal-Detectable Change – MDC) w próbach stosowanych w koszykówce były rzadko raportowane. Celem opracowania jest wypełnienie tej luki i próba zaprezentowania wyników rzetelności i MDC często stosowanych testów sprawności motorycznej w badaniach, ale u koszykarzy w kategorii ‘kadet’. W tym celu przeprowadzono badania w grupie 14 koszykarzy w wieku 15,3 ±1,04 lat. Przeprowadzono próby skoczności, biegu po linii prostej oraz biegu ze zmianą kierunku. Na podstawie wyników tych prób obliczono wskaźnik siły reaktywnej, pędu sprintu oraz wskaźnika utylizacji cyklu rozciąganie–skurcz. Rezultaty badań własnych ujawniły, że najwyższe wyniki rzetelności osiągnięto dla uśrednionych wyników z próby drugiej oraz trzeciej. Dobrą możliwość wykrycia minimalnej zmiany sprawności odnotowano dla wszystkich prób, z wyjątkiem wskaźnika utylizacji cyklu rozciąganie–skurcz były na akceptowalnym poziomie. Zastosowanie procedury w niniejszym badaniu może stanowić praktyczne wskazówki w celu analizy zmian sprawności motorycznej koszykarzy.
    During a basketball game, the main motor activities performed by the players are running, jumping, sprinting and changing the direction of the run. These motor activities should constitute the main content of the battery of physical performance tests in basketball. Reliability and the minimal detectable change (MDC) in tests used in basketball are rarely reported in literature. The aim of the study was to fill this gap and an attempt to show the reliability and MDC of various tests among basketball players in the Cadet category. For this purpose, research was carried out in a group of 14 basketball players aged 15.3 years. Jumping tests, sprint test and a change of direction test were carried out. Based on the results of these tests, the index of reactive force, sprint momentum and the utilization index of the stretch-shortening cycle were calculated. The reliability and MDC of all tests, with the exception of the utilization rate of the stretch-shortening cycle, were at an acceptable level. In practical terms using of the procedure described in this study may provide valuable guidance in the analysis of changes in basketball players' physical performance.
    Źródło:
    Health Promotion & Physical Activity; 2022, 19, 2; 19-25
    2544-9117
    Pojawia się w:
    Health Promotion & Physical Activity
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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