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Correlations of jump height and lower limb power during jump tests with biomechanical parameters of dolphin kick in swimming

Hołub Maciej, Głyk Wojciech, Baron Jakub, Stanula Arkadiusz

Acta of Bioengineering and Biomechanics

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2022

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Vol. 24, no. 3

33--39

EN

The aim of this study was to investigate the correlations of lower limb power and jump height in the SJ, CMJ, ACMJ and CJ30s tests with time, speed, force, power, and work done during dolphin kick. Methods: Seventeen female swimmers and seventeen male swimmers of an elite swimming sports school in Poland participated in the study. The parameters being recorded and used in the analysis were the jump height and lower limb power in jump tests. In the test of 25 meters of dolphin kick in swimming at maximum pace, the results used in the analysis were the mean values of time, velocity, power, force and work. Results were expressed as means ± standard deviations. Descriptive statistics of the groups were then compiled to finally perform Pearson correlation calculations. Results: The highest correlations occurred between lower limb power during jumps and swimming speed, especially for men in the ACMJ (r = 0.5468, p = 0.023) and SJ (r = 0.5411, r = 0.025) tests. Jump height was not as often and strongly correlated with swimming time and speed as lower limb power. An important observation is that no statistically significant correlations were found for power, force and work during dolphin kick with lower limb power and jump height. Conclusions: The present study showed strong correlations between the performance variables of swimmers on dry land and in water. The most important finding is that the power during all the jumps (ACMJ, SJ, CJ30s and CMJ) was strongly correlated with the time and speed of swimming using dolphin kick.

2

Modern porous polymer and carbon materials based on polyurethanes for applications in medical diagnostics

Swinarew Andrzej S., Kubik Klaudia, Gabor Jadwiga, Paluch Jarosław, Popczyk Magdalena, Stanula Arkadiusz, Okła Hubert, Świerczyński Adam

Engineering of Biomaterials

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2021

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Vol. 24, no. 163

33

3

Symulacja oraz badania wytrzymałości struktur przestrzennych modeli otrzymanych metodą druku 3D-FDM

Swinarew Andrzej S., Gabor Jadwiga, Kubik Klaudia, Popczyk Magdalena, Swinarew Beata, Okła Hubert, Żarnowski Mirosław, Stanula Arkadiusz

Przemysł Chemiczny

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2020

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T. 99, nr 3

373--377

PL

Dokonano oceny metody doboru najkorzystniejszej struktury wewnętrznej dla elementów pracujących w warunkach przenoszenia naprężeń. Przedstawiono czynności związane z zaprojektowaniem modeli do druku 3D, a także opisano ich zachowanie podczas badań wytrzymałościowych.

EN

Six geometric models with different internal structures were designed by using a computer-aided procedure (shape program) and 3-dimensionally printed by incremental technol. A polyol-modified and SiO2 nanoparticles-filled polycarbonate was used as the filament. The model with the large hexagon structure showed the highest compressive strength and with the circular structure showed the lowest one. A large discrepancy between the simulated and actual values of compressive strength was obsd.

4

Organic bacteriostatic material

Flak Tomasz, Paluch Jarosław, Gabor Jadwiga, Okła Hubert, Stanula Arkadiusz, Markowski Jarosław, Plich Jan, Swinarew Andrzej S.

Engineering of Biomaterials

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2020

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Vol. 23, no. 155

17--21

EN

The use of antibiotics to treat bacterial infections is becoming less and less effective year by year due to the increasing resistance of bacteria. The microbial evolutionarily acquired resistance to antibiotics increases the threat to man’s life due to difficulties regarding effective therapies to fight infections. Therefore, apart from treatment, it is necessary to introduce appropriate prophylaxis which limits the multiplication of bacterial colonies on everyday use objects. Due to the antibiotic resistance phenomenon, it is important to find a new material with antibacterial properties for FDM 3D printing in medical applications. The work contains research on a new chemical compound used as an additive to thermoplastics. The rhodamine derivative was synthesized via the 4-diphenylaminobenzaldehyde reaction with 1.3-indendione in a boiling mixture of EtOH/H2SO4. The obtained chemical compound was used as a bacteriostatic modifier of the polycarbonate (PC) properties, as such a modification enables application e.g. for medical device housings or for surfaces frequently touched by people. The modifier and the commercially available polymer were compounded with a high-temperature screw extruder and a filament for FDM 3D printer was created. The modified polymer revealed antibacterial properties relative to Escherichia coli and good thermal stability during the processing.

5

Body composition and specific and general strength indices as predictors of 100-m front crawl performance

Strzała Marek, Stanula Arkadiusz, Krężałek Piotr, Sadowski Wojciech, Wilk Robert, Pałka Tomasz, Sokołowski Kamil, Radecki-Pawlik Artur

Acta of Bioengineering and Biomechanics

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2020

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Vol. 22, no. 4

51--60

EN

The purpose of this research was to examine the impact of body composition on the anaerobic ability to generate strength and power produced separately by upper and lower limbs during dry-land and in-water (propulsion force) tests. Further examination included the influence of all gathered anaerobic strength indices on the results of 100-m front crawl race. Methods: The study involved 26 male swimmers (age: 19.8 ± 2.48 years). Fat-free mass, total body water and muscle mass of arms, legs, and trunk were measured. Dry-land average work, maximal power generated in 40-second arm-cranking test, and work generated in 20 countermovement jumps were evaluated. The forces generated separately by arms and legs were assessed during 40-second tethered swimming. All indices of body composition were found strongly correlated with indices of average work and maximal power generated by arms and legs in dryland tests. Results: Muscle mass of arms and trunk moderately and strongly (r = 0.44–0.64) influenced the force generated by arms in tethered swimming. There was no significance in the relationship of leg muscle mass and force generated by legs in tethered swimming. Significant relationships were observed between the results of the 100-m front crawl and the muscle mass of the arms, trunk, legs, as well as the average work and maximal power in the arm-cranking test (r: 0.39–0.54). The average impulse of arm force and maximal leg force in tethered swimming moderately and significantly correlated with 100-m swimming results. Conclusions: The study concludes the relevance of developing muscle mass balanced to the body size, which is involved in propulsion force production in sprint front crawl swimming.

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Porowate materiały poliuretanowe do zastosowań w diagnostyce medycznej

Swinarew Andrzej S., Muskus Maciej, Gabor Jadwiga, Paluch Jarosław, Popczyk Magdalena, Swinarew Beata, Stanula Arkadiusz, Kubik Klaudia K., Okła Hubert, Liszka Barbara

Przemysł Chemiczny

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2019

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T. 98, nr 2

251--256

PL

Opracowano proces wytwarzania pianek węglowych (synteza, karbonizacja), a także dokonano ich szerokiej charakterystyki, wykorzystując mikroskopię świetlną, skaningową mikroskopię elektronową SEM, mikrotomografię komputerową μCT, spektroskopię w podczerwieni FT-IR i chromatografię gazową sprzężoną z detektorem mas GC-MS. Wyniki przeprowadzonych badań umożliwiły wyselekcjonowanie pianek o najlepszych właściwościach sorpcyjnych, które mogą znaleźć zastosowanie w diagnostycznych badaniach fazy oddechowej.

EN

Polyurethane (PUR) foams were synthetized from polyols and methylene diphenyl diisocyanate polymers at mass ratios 1:1, 1:3 and 3:1 without any catalyst or in its presence. The porous structure of the PUR foams was detd. by using scanning electron microscopy and high-resolution 3D computed tomog. The PUR foams showed a good sorbability and could be used in the human diagnostic (respiratory phase).