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1

The anthropometric profile of adult swimmers from Poland compared to the corresponding data of swimmers from Norway

Rejman Marek, Mikołajewicz Aleksandra, Rudnik Rudnik, Siermontowski Piotr

Polish Hyperbaric Research

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2022

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nr 2(79)

65--84

EN

The purpose of the research is to compare the somatic parameters of people practicing swimming in different conditions of the geographical environment - in Poland and Norway. The research material was collected by performing anthropometric measurements in a 112 person group of professional swimmers living in Poland and group 21 swimmers from Norway. The mean of the age in the group of Poles was 19.97 years (SD=3.31) and in the group of Norwegians it was 17.11 years (SD=1.05). A series of anthropometric measurements was performed in both research groups. Statistical analyzes were made using the Statistica 13.1 (StatSoft, USA). In summary of the results of the conducted research, it must be emphasized that these indicate differences in the somatic structure of swimmers living and training in Poland and Norway.

PL

Celem badań jest porównanie parametrów somatycznych osób uprawiających pływanie w różnych warunkach środowiska geograficznego - w Polsce i w Norwegii. Materiał badawczy, zebrano wykonując pomiary antropometryczne w 112 osobowej grupie wyczynowo trenujących pływaków mieszkających w Polsce oraz w grupie 21 pływaków z Norwegii. Średnia wieku w grupie Polaków wyniosła 19,97 lat, (SD=3,31), a w grupie Norwegów 17,11 lat (SD=1,05). Seria pomiarów antropometrycznych została wykonana w obu grupach badawczych. Analiz statystycznych dokonano przy użyciu oprogramowania Statistica 13.1 (StatSoft, USA). Podsumowując wyniki przeprowadzonych badań, należy podkreślić, że wskazują one na występowanie różnic w budowie somatycznej pływaków zamieszkujących i trenujących w Polsce i w Norwegii.

2

Effectiveness of the power and speed dry-land training in female swimmers aged 15–16

Guzik-Kopyto Agata, Nowakowska-Lipiec Katarzyna, Nocoń Anna, Gzik Marek, Michnik Robert

Acta of Bioengineering and Biomechanics

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2021

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Vol. 23, no. 2

13--21

EN

Purpose: This work aimed to define the impact of the introduction of power and speed dry-land training in female swimmers aged 15–16 on the rise of time results at a distance of 200 m and on the increase of the strength level of the muscle groups in the elbow joint. Method: The investigations were conducted on a group of 28 junior female swimmers: group 1 (aged 13–14) with speed and endurance training based on “water” exercises; group 2 (aged 15–16) with extra power and speed dry-land training. The following parameters were analyzed: time results, the moments of muscle forces in the elbow joint at the extension and flexion movements in isokinetic conditions and the ratio of the values of moments of muscle forces of flexors in relation to extensors. Results: Statistically significant differences between groups were found for the following parameters: the time results from swimming 200 m with ( p < 0.001) and without using lower limbs ( p = 0.031), the ratio of the moments of muscle forces of flexors to extensors ( p < 0.05). Conclusions: The results of the correlation analysis show that the higher the moments of muscle forces of flexors and extensors of the elbow joint, the shorter the time obtained in swimming 200 m in the freestyle stroke.

3

Can concurrent teaching promote equal biomechanical adaptations at front crawl and backstroke swimming?

Costa M. J., Barbosa T. M., Morais J. E., Miranda S., Marinho D. A.

Acta of Bioengineering and Biomechanics

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2017

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Vol. 19, no. 1

81--88

EN

Purpose: The biomechanical adaptations in front crawl and backstroke swimming, as influenced by the implementation of a concurrent teaching programme were analysed. Methods: Sixteen participants (19.75 ± 1.13 years) underwent a 30 weeks intervention characterized by an increasing complexity to accomplish motor skills in the following order: (i) lower limbs propulsion; (ii) lower limbs propulsion synchronized with breathing cycle; (iii) lower limbs propulsion synchronized with one upper limb action; (iv) lower limbs propulsion synchronized with both breathing cycle and one upper limb action; (v) full swimming stroke; (vi) motor trajectory of the arms stroke. Performance and biomechanics were measured at front crawl and backstroke during three time points throughout the programme. Results: There were improvements in performance over time at front crawl (21.49 s to 19.99 s, p < 0.01) and backstroke (27.15 s to 24.60 s, p = 0.01). Significant improvements were found for velocity at front crawl (1.13 m/s to 1.22 m/s, p < 0.01) and backstroke (0.92 m/s to 1.00 m/s, p < 0.01). Stroke frequency increased at backstroke (0.64 to 0.73 Hz, p = 0.01), while the intra-cyclic variation of the velocity decreased at front crawl (0.13 to 0.12%, p = 0.02). There was also a moderate-high inter-subject variability in response to the programme. Conclusions: These findings prove that a programme of 30 weeks teaching concurrently front crawl and backstroke is effective to promote similar biomechanical adaptations in low-tier swimmers. However, each subject shows an individual response to better adapt the biomechanical actions and to reach a higher level of expertise.

4

Pomiar przepływu w korytach pływakami całkującymi

Dąbrowski W.

Instal

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2014

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nr 6

80--83

PL

Przedstawiono metodę zastosowania pływaka całkującego w postaci bąbelków powietrza. Opisano sposób doboru wielkości bąbelków, tak aby zminimalizować wpływ wysokości zagłębienia na ich prędkość wznoszenia.

EN

A method of using air bubbles as integrating floats has been presented. The choice of air bubbles volume has been described. The purpose of this choice is minimizing the impact of flow depth on velocity of bubble rising up.

5

Zastosowanie freeflowmetrii w ocenie parametrów oddechowych młodych pływaków

Podolec Z., Kozłowska D., Panek D.

Aktualne Problemy Biomechaniki

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2013

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z. 7

143--146

PL

Badanie freeflowmetryczne (FFM) pozwala na ocenę wpływu techniki wydechu na wartości parametrów oddechowych. W niniejszym projekcie wykorzystano badanie FFM w celu zbadania mechanizmów zmian zachodzących w układzie oddechowym na skutek treningu pływackiego. Stwierdzono, że zastosowanie wydechu przez zasznurowane usta i przez nos istotnie redukuje pułapkę powietrzną. Pozwala to przypuszczać, że przyczyną występowania pułapki powietrznej u pływaków może być wiotkość dróg oddechowych.

EN

Freeflowmetry allows to evaluate influence of exhalation technique on spirometric parameters. This project uses freeflowmetric examination to explore the changes occurring in respiratory tract of young swimmers. We found that pursed lips breathing and nose breathing significantly reduces air trapping. Therefore, it is possible that air trapping in swimmers may be caused by limpness of respiratory tract.

6

Tracking young talented swimmers : follow-up of performance and its biomechanical determinant factors

Morais J. E., Saavedra J. M., Costa M. J., Silva A. J., Marinho D. A., Barbosa T. M.

Acta of Bioengineering and Biomechanics

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2013

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Vol. 15, no. 3

129--138

EN

The aim of the study was to follow-up the stability of young talented swimmers’ performance and its biomechanical determinant factors (i.e., anthropometrics, kinematics, hydrodynamics and efficiency) during a competitive season. Thirty three (15 boys and 18 girls) young swimmers (overall: 11.81 ± 0.75 years old and Tanner stages 1–2 by self-evaluation) were evaluated. Performance, anthropometrics, hydrodynamics, kinematics and efficiency variables were assessed at three moments during a competitive season. Performance had a significant improvement (with minimum effect size) and a moderate-very high stability throughout the season. In the anthropometrics domain all variables increased significantly (ranging from without to minimum effect size) between moments and had a moderate-very high stability. Hydrodynamics presented no variations between all moments and had a low-very high stability throughout the season. In the kinematics domain, there were no variations between moment one and three, except for an increase in stroke frequency (without size effect). Speed fluctuation remained constant, with no significant variations. All kinematic variables had a low-very high stability. Efficiency variables did not present variations between moment one and three and had a low-moderate stability. Overall, young swimmers showed a minimum improvement in performance and in anthropometric factors; and a moderate stability of performance and its determinant factors (i.e., anthropometrics, hydrodynamics, kinematics and efficiency) during the competitive season.

7

Analysis of wall shear stress around a competitive swimmer using 3D Navier-Stokes equations in CFD

Popa C.V., Zaidi H., Arfaoui A., Polidori G., Taiar R., Fohanno S.

Acta of Bioengineering and Biomechanics

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2011

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Vol. 13, no. 1

3-11

EN

This paper deals with the flow dynamics around a competitive swimmer during underwater glide phases occurring at the start and at every turn. The influence of the head position, namely lifted up, aligned and lowered, on the wall shear stress and the static pressure distributions is analyzed. The problem is considered as 3D and in steady hydrodynamic state. Three velocities (1.4 m/s, 2.2 m/s and 3.1 m/s) that correspond to inter-regional, national and international swimming levels are studied. The flow around the swimmer is assumed turbulent. The Reynolds-averaged Navier-Stokes (RANS) equations are solved with the standard k-u turbulent model by using the CFD (computational fluid dynamics) numerical method based on a volume control approach. Numerical simulations are carried out with the ANSYS FLUENTŽ CFD code. The results show that the wall shear stress increases with the velocity and consequently the drag force opposing the movement of the swimmer increases as well. Also, high wall shear stresses are observed in the areas where the body shape, globally rigid in form, presents complex surface geometries such as the head, shoulders, buttocks, heel and chest.