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Zbigniew Staniak, Krzysztof Buśko, Michał Górski, Anna Pastuszak
PURPOSE: The aim of the study was to develop a method to measure and analyse kinematics of movement of the pelvic girdle in butterfly swimming in order to support training of technical skills. METHODS: A device for recording triaxial accelerations and triaxial rotational angular velocities was mounted on the dorsal part of the pelvic girdle of athlete. The measurements were performed in ten elite butterfly swimmers (age: 23.1 ± 3.7 years, body height: 187.6 ± 4...
2018: Acta of Bioengineering and Biomechanics
Celia Seguin, Gilles Blaquière, Anderson Loundou, Pierre Michelet, Thibaut Markarian
BACKGROUND: Drowning literature have highlighted the submersion time as the most powerful predictor in assessing the prognosis. Reducing the time taken to provide a flotation device and prevent submersion appears of paramount importance. Unmanned aerial vehicles (UAVs) can provide the location of the swimmer and a flotation device. OBJECTIVE: The objective of this simulation study was to evaluate the efficiency of a UAV in providing a flotation device in different sea conditions, and to compare the times taken by rescue operations with and without a UAV (standard vs UAV intervention)...
April 10, 2018: Resuscitation
Eva Piatrikova, Ana C Sousa, Javier T Gonzalez, Sean Williams
PURPOSE: To assess the concurrent and predictive validity of the 3-min all-out test (3MT) against conventional methods (CM) of determining critical speed (CS) and curvature constant (D'), and to examine the test-retest reliability of the 3MT in highly-trained swimmers. METHODS: Thirteen highly-trained swimmers (age: 16 ± 2 y, weight: 64.7 ± 8.5 kg, height: 1.76 ± 0.07 m) completed four time trials, and two 3MT over 2 weeks. The distance-time (DT) and speed-1/time (1/T) models were used to determine CS and D' from four time trials...
April 13, 2018: International Journal of Sports Physiology and Performance
Neha Sunger, Kerry A Hamilton, Paula M Morgan, Charles N Haas
Typical recreational water risk to swimmers is assessed using epidemiologically derived correlations by means of fecal indicator bacteria (FIB). It has been documented that concentrations of FIB do not necessarily correlate well with protozoa and viral pathogens, which pose an actual threat of illness and thus sometimes may not adequately assess the overall microbial risks from water resources. Many of the known pathogens have dose-response relationships; however, measuring water quality for all possible pathogens is impossible...
April 11, 2018: Environmental Science and Pollution Research International
Denis Vinnikov, Zhanna Romanova, Anar Dushpanova, Karashash Absatarova, Zhazira Utepbergenova
Background: Little is known about the supplements use and recreational sport practices in Kazakhstan university students. Therefore, the aim of this study was to ascertain supplements use prevalence and their predictors in this population. Methods: Cross-sectional survey of both undergraduate and graduate level students was completed in 2017 et al.-Farabi Kazakh National University, the largest higher institution in the country, from almost all Schools. A 45-item questionnaire was used to record physical activity, supplements use, lifestyle attributes (smoking, alcohol, sleep, etc...
2018: Journal of the International Society of Sports Nutrition
Brendan Burkett, Carl Payton, Peter Van de Vliet, Hannah Jarvis, Daniel Daly, Christiane Mehrkuehler, Marvin Kilian, Luke Hogarth
Swimming is one of the inaugural sports within the Olympic and Paralympic Games, the key difference between the Olympic and Paralympic games being the classification system. The aim of this study was to investigate how effective the current classification system creates clearly differentiated Paralympic competition classes, based on performance time for all swimming strokes and events. Based on the performance characteristics of swimmers within the current classification system, the relationship between impairment and swimming performance is inconsistent, potentially disadvantaging some athletes...
May 2018: Physical Medicine and Rehabilitation Clinics of North America
Abdallah Daddi-Moussa-Ider, Maciej Lisicki, Christian Hoell, Hartmut Löwen
The hydrodynamic flow field generated by self-propelled active particles and swimming microorganisms is strongly altered by the presence of nearby boundaries in a viscous flow. Using a simple model three-linked sphere swimmer, we show that the swimming trajectories near a no-slip wall reveal various scenarios of motion depending on the initial orientation and the distance separating the swimmer from the wall. We find that the swimmer can either be trapped by the wall, completely escape, or perform an oscillatory gliding motion at a constant mean height above the wall...
April 7, 2018: Journal of Chemical Physics
Alejandro Gómez-Bruton, Alejandro González-Agüero, Angel Matute-Llorente, Cristina Julián, Gabriel Lozano-Berges, Alba Gómez-Cabello, Nuria Garatachea, Jose A Casajús, German Vicente-Rodríguez
BACKGROUND: Swimming has no effect on bone mass or structure. Therefore, adolescent swimmers present similar bone strength values when compared to normo-active controls, and lower values when compared to weight-bearing athletes. It thus seems necessary to try to improve bone structure and strength of adolescent swimmers through a weight-bearing intervention in order to reduce the risk of suffering osteoporosis later in life. OBJECTIVE: To evaluate the effects of a 6-month WBV intervention on bone strength and structure of adolescent swimmers...
April 4, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
Sabina Škrgat, Peter Korošec, Izidor Kern, Mira Šilar, Julij Šelb, Matjaž Fležar, Robert Marčun
No abstract text is available yet for this article.
April 3, 2018: Respiratory Medicine
Yuval Harduf, Dongdong Jin, Yizhar Or, Li Zhang
Microscopic artificial swimmers have recently become highly attractive due to their promising potential for biomedical microrobotic applications. Previous pioneering work has demonstrated the motion of a robotic microswimmer with a flexible chain of superparamagnetic beads, which is actuated by applying an oscillating external magnetic field. Interestingly, they have shown that the microswimmer's orientation undergoes a 90°-transition when the magnetic field's oscillation amplitude is increased above a critical value...
April 5, 2018: Soft Robotics
Markus Selmke, Utsab Khadka, Andreas P Bregulla, Frank Cichos, Haw Yang
Photon nudging allows the manipulation and confinement of individual self-propelled micro-swimmers in 2D and 3D environments using feedback controls. Presented in this second part of a two-part contribution are theoretical models that afford the characterization for the positioning distribution associated with active localization. A derivation for the optimal nudging speed and acceptance angle is given for minimal placement uncertainty. The analytical solutions allow for a discussion on the physical underpinning that underlies controllability and optimality...
April 5, 2018: Physical Chemistry Chemical Physics: PCCP
J M van der Hoop, M L Byron, K Ozolina, D L Miller, J L Johansen, P Domenici, J F Steffensen
Fish swimming energetics are often measured in laboratory environments which attempt to minimize turbulence, though turbulent flows are common in the natural environment. To test whether the swimming energetics and kinematics of shiner perch Cymatogaster aggregata (a labriform swimmer) were affected by turbulence, two flow conditions were constructed in a swim-tunnel respirometer. A low-turbulence flow was created using a common swim-tunnel respirometry setup with a flow straightener and fine-mesh grid to minimize velocity fluctuations...
April 3, 2018: Journal of Experimental Biology
Yuji Matsuda, Yoshihisa Sakurai, Keita Akashi, Yasuyuki Kubo
Center of mass (CoM) velocity variation in swimming direction is related to swimming performance and efficiency. However, it is difficult to calculate the CoM velocity during swimming. Therefore, we aimed to establish a practical estimation method for the CoM velocity in swimming direction during front-crawl swimming with underwater cameras. Ten swimmers were recorded during front-crawl swimming (25 m, maximal effort) using a motion capture system with 18 underwater and 9 land cameras. Three CoM velocity estimation methods were constructed (single-hip velocity, both-hips velocity, and both-hips velocity with simulated arm velocity correction)...
April 3, 2018: Journal of Applied Biomechanics
Thiruppathiraja Chinnasamy, James L Kingsley, Fatih Inci, Paul J Turek, Mitchell P Rosen, Barry Behr, Erkan Tüzel, Utkan Demirci
Male infertility is a reproductive disease, and existing clinical solutions for this condition often involve long and cumbersome sperm sorting methods, including preprocessing and centrifugation-based steps. These methods also fall short when sorting for sperm free of reactive oxygen species, DNA damage, and epigenetic aberrations. Although several microfluidic platforms exist, they suffer from structural complexities, i.e., pumps or chemoattractants, setting insurmountable barriers to clinical adoption. Inspired by the natural filter-like capabilities of the female reproductive tract for sperm selection, a model-driven design, featuring pillar arrays that efficiently and noninvasively isolate highly motile and morphologically normal sperm, with lower epigenetic global methylation, from raw semen, is presented...
February 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Sabina Škrgat, Robert Marčun, Izidor Kern, Mira Šilar, Julij Šelb, Matjaž Fležar, Peter Korošec
BACKGROUND: The environment in swimming pools, which contain chlorine, might interact with the airway epithelium, resulting in oxidative stress and/or inflammation during high intensity training periods. METHODS: We evaluated pulmonary functional (metacholine challenge test, FEV1 and VC), cellular (eosinophils and neutrophils), inflammatory (FeNo, IL-5, IL-6, IL-8 and TNF-α), oxidative (8-isoprostanes) and angiogenesis factors (VEGF) in induced sputum and peripheral blood of 41 healthy non-asthmatic elite swimmers (median 16 years) during the period of high intensity training before a national championship...
April 2018: Respiratory Medicine
Karla de Jesus, Helon V H Ayala, Kelly de Jesus, Leandro Dos S Coelho, Alexandre I A Medeiros, José A Abraldes, Mário A P Vaz, Ricardo J Fernandes, João Paulo Vilas-Boas
Our aim was to compare non-linear and linear mathematical model responses for backstroke start performance prediction. Ten swimmers randomly completed eight 15 m backstroke starts with feet over the wedge, four with hands on the highest horizontal and four on the vertical handgrip. Swimmers were videotaped using a dual media camera set-up, with the starts being performed over an instrumented block with four force plates. Artificial neural networks were applied to predict 5 m start time using kinematic and kinetic variables and to determine the accuracy of the mean absolute percentage error...
March 2018: Journal of Human Kinetics
Zaiyi Shen, Alois Würger, Juho S Lintuvuori
Using lattice Boltzmann simulations we study the hydrodynamics of an active spherical particle near a no-slip wall. We develop a computational model for an active Janus particle, by considering different and independent mobilities on the two hemispheres and compare the behaviour to a standard squirmer model. We show that the topology of the far-field hydrodynamic nature of the active Janus particle is similar to the standard squirmer model, but in the near-field the hydrodynamics differ. In order to study how the near-field effects affect the interaction between the particle and a flat wall, we compare the behaviour of a Janus swimmer and a squirmer near a no-slip surface via extensive numerical simulations...
March 27, 2018: European Physical Journal. E, Soft Matter
Jacopo Preziosi Standoli, Francesco Fratalocchi, Vittorio Candela, Tiziano Preziosi Standoli, Giuseppe Giannicola, Marco Bonifazi, Stefano Gumina
Background: Overhead athletes are at a greater risk of developing scapular dyskinesis (SD). Although swimming is considered an overhead sport, information regarding SD in these athletes is scarce. Purpose: To determine the prevalence of SD in young, asymptomatic elite swimmers. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 661 asymptomatic elite swimmers were enrolled in this study (344 male, 317 female; mean age, 15...
January 2018: Orthopaedic Journal of Sports Medicine
Timothy J Wade, Swinburne A J Augustine, Shannon M Griffin, Elizabeth A Sams, Kevin H Oshima, Andrey I Egorov, Kaneatra J Simmons, Tarsha N Eason, Alfred P Dufour
BACKGROUND: Swimming in fecally-contaminated waterbodies can result in gastrointestinal infections. However, the pathogenic microorganisms responsible are not well understood because sporadic cases of illness are not reported completely, exposure information is often not collected, and epidemiology studies rely on self-reported symptoms. Noroviruses are considered a likely cause because they are found in high densities in sewage, resistant to wastewater treatment and survive in the environment...
2018: PloS One
Zhengjia Wang, Yen-Fu Chen, Hsuan-Yi Chen, Yu-Jane Sheng, Heng-Kwong Tsao
The mechanical pressure, surface excess, and polar order of a dilute rod-like nanoswimmer suspension confined by two parallel plates are explored by dissipative particle dynamics. The accumulation and preferred orientation of swimmers near the walls are distinctly shown through the density and polar order distributions for various active force, Fa, values and rod lengths. As Fa is increased, it is interesting to observe that there exists a maximum of the polar order, revealing that the dominant mechanism of the swimmer behavior can be altered by the coupling between the active force and the rod-wall interaction...
March 28, 2018: Soft Matter
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