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https://www.readbyqxmd.com/read/29330962/skin-conformal-polymer-electrodes-for-clinical-ecg-and-eeg-recordings
#1
Flurin Stauffer, Moritz Thielen, Christina Sauter, Séverine Chardonnens, Simon Bachmann, Klas Tybrandt, Christian Peters, Christofer Hierold, Janos Vörös
Preparation-free and skin compliant biopotential electrodes with high recording quality enable wearables for future healthcare and the Internet of Humans. Here, super-soft and self-adhesive electrodes are presented for use on dry and hairy skin without skin preparation or attachment pressure. The electrodes show a skin-contact impedance of 50 kΩ cm2 at 10 Hz that is comparable to clinical standard gel electrodes and lower than existing dry electrodes. Microstructured electrodes inspired by grasshopper feet adhere repeatedly to the skin with a force of up to 0...
January 13, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29327825/the-sagittal-spinal-alignment-in-young-swimmers-and-glide-performance-the-importance-of-lumbar-lordosis
#2
Teresa Paolucci, Federico Zangrando, Dario Palladino, Antonio Monaco, Barbara Cordiani, Alice Mannocci, Vincenzo M Saraceni, Ciro Villani
No abstract text is available yet for this article.
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29327649/the-effect-of-auditory-stimulus-training-on-swimming-start-reaction-time
#3
Christopher Papic, Peter Sinclair, Che Fornusek, Ross Sanders
Task-specific auditory training can improve sensorimotor processing times of the auditory reaction time (RT). The majority of competitive swimmers do not conduct habitual start training with the electronic horn used to commence a race. We examined the effect of four week dive training interventions on RT and block time (BT) of 10 male adolescent swimmers (age 14.0 ± 1.4 years): dive training with auditory components (speaker and electronic horn) (n = 5) and dive training without auditory components (n = 5)...
January 12, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29326358/targeted-alpha-therapy-of-mcrpc-with-225actinium-psma-617-swimmer-plot-analysis-suggests-efficacy-regarding-duration-of-tumor-control
#4
Clemens Kratochwil, Frank Bruchertseifer, Hendrik Rathke, Markus Hohenfellner, Frederik L Giesel, Uwe Haberkorn, Alfred Morgenstern
The aim of this evaluation is to identify first indicators regarding the efficacy of 225Ac-PSMA-617 therapy in a retrospectively analyzed group of patients. Methods: Forty patients with metastatic castration-resistant prostate cancer were selected for treatment with 3 cycles of 100 kBq/kgBW 225Ac-PSMA-617 in 2 months intervals. Prostate-specific antigen (PSA) and blood cell count were measured every 4 weeks. Prostate-specific membrane antigen (PSMA)-PET/CT or PSMA-SPECT/CT were used for baseline staging and imaging follow-up at month six...
January 11, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29318954/contribution-of-limbs-actions-to-the-four-competitive-swimming-strokes-a-nonlinear-approach
#5
Raul F Bartolomeu, Mário J Costa, Tiago M Barbosa
The aim of our study was to assess the effect of the limbs' actions on the nonlinear properties of the four competitive swimming strokes. Forty-nine swimmers performed all-out sprints at front-crawl, backstroke, breaststroke and butterfly, each one at full stroke (FS), only the arms' stroke (AS), and only leg kicking (LK), in a total of 12 bouts, 6 per day. A speedo-meter cable was attached to the swimmer's hip, to collect the speed-time raw data (f = 50Hz). Velocity, speed fluctuation, sample entropy and fractal dimension were derived from the speed-time series...
January 10, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29316316/serum-but-not-exhaled-breath-condensate-periostin-level-is-increased-in-competitive-athletes
#6
Marcin Kurowski, Janusz Jurczyk, Marzanna Jarzębska, Aleksandra Wardzyńska, Hubert Krysztofiak, Marek L Kowalski
INTRODUCTION: Periostin is a matricellular protein expressed by many tissues. Its release may be enhanced, among others, through mechanical stimulation of muscles and bones as well as by cytokines of allergic inflammation. OBJECTIVES: Our aim was to assess periostin levels in serum and exhaled breath condensate (EBC) of professional athletes, asthmatics and healthy controls. We also sought to determine whether acute treadmill exercise influences serum and EBC periostin...
January 8, 2018: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29313111/long-term-swimming-training-modifies-acute-immune-cell-response-to-a-high-intensity-session
#7
José P Morgado, Cristina P Monteiro, Catarina N Matias, Joana F Reis, Júlia Teles, Maria José Laires, Francisco Alves
PURPOSE: Long-term training influence on athletes' immune cell response to acute exercise has been poorly studied, despite the complexity of both chronic and acute adaptations induced by training. The purpose of the study is to study the influence of a 4-month swimming training cycle on the immune cell response to a high-intensity training session, during 24 h of recovery, considering sex, maturity, and age group. METHODS: Forty-three swimmers (16 females, 14.4 ± 1...
January 8, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29309273/micro-flock-patterns-and-macro-clusters-in-chiral-active-brownian-disks
#8
Demian Levis, Benno Liebchen
Chiral active particles (or self-propelled circle swimmers) feature a rich collective behavior, comprising rotating macro-clusters and micro-flock patterns which consist of phase-synchronized rotating clusters with a characteristic self-limited size. These patterns emerge from the competition of alignment interactions and rotations suggesting that they might occur generically in many chiral active matter systems. However, although excluded volume interactions occur naturally among typical circle swimmers, it is not yet clear if macro-clusters and micro-flock patterns survive their presence...
January 8, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29286796/buckling-instability-causes-inertial-thrust-for-spherical-swimmers-at-all-scales
#9
Adel Djellouli, Philippe Marmottant, Henda Djeridi, Catherine Quilliet, Gwennou Coupier
Microswimmers, and among them aspirant microrobots, generally have to cope with flows where viscous forces are dominant, characterized by a low Reynolds number (Re). This implies constraints on the possible sequences of body motion, which have to be nonreciprocal. Furthermore, the presence of a strong drag limits the range of resulting velocities. Here, we propose a swimming mechanism which uses the buckling instability triggered by pressure waves to propel a spherical, hollow shell. With a macroscopic experimental model, we show that a net displacement is produced at all Re regimes...
December 1, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29283692/intra-cyclic-variation-of-force-and-swimming-performance
#10
Pedro G Morouço, Tiago Barbosa, Raul Arellano, João Paulo Vilas-Boas
PURPOSE: In front crawl swimming, the upper limbs alternate move with the aim of achieving a continuous application of force in the water, leading to lower intra-cyclic velocity variation (dv). This parameter has been identified as a crucial criterion for swimmers' evaluation, thus the present study aimed to examine the assessment of intra-cyclic force variation (dF) and to analyze its relationship with dv and swimming performance. METHODS: Twenty-two high-level male swimmers performed a maximal effort 50-m front crawl time-trial and a 30-s maximal effort fully tethered swimming test, which were randomly assigned...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29276857/mental-fatigue-impairs-physical-performance-in-young-swimmers
#11
Eduardo Macedo Penna, Edson Filho, Samuel Penna Wanner, Bruno Teobaldo Campos, Gabriel Resende Quinan, Thiago Teixeira Mendes, Mitchell Robert Smith, Luciano Sales Prado
PURPOSE: This study aimed to investigate the impact of mental fatigue on heart rate variability, subjective measures of fatigue, and swimming performance in young athletes. METHODS: Sixteen swimmers [15.45 (0.51) y old, 7.35 (2.20) y of swimming experience] performed a 1500-m time trial on 2 occasions separated by an interval of at least 72 hours. The 1500-m swimming was preceded by a 30-minute treatment that consisted of performing the Stroop Color and Word test to induce mental fatigue (experimental trial) or watching an emotionally neutral video (control trial)...
December 23, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29274455/biomechanical-analysis-of-the-shoulder-of-swimmers-after-a-maximal-effort-test
#12
Felipe S Serenza, Anamaria S Oliveira, Bruno L S Bedo, Fàbio P Mariano, Rodrigo Aquino, Martin Warner, Paulo R P Santiago
OBJECTIVES: To compare the kinematics and electromyography of the periscapular muscles in swimmers before and after a 3-min maximal effort test. PARTICIPANTS: 16 competitive swimmers. MAIN OUTCOME MEASUREMENTS: Infrared cameras were used to record kinematics in the scapular plane in synchronization with the electromyography system. RESULTS: There was an increase in internal rotation in all angles (p < 0.05), an increase of the anterior tilt, with 120° of elevation (p = 0...
November 6, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29255047/enzyme-leaps-fuel-antichemotaxis
#13
Ah-Young Jee, Sandipan Dutta, Yoon-Kyoung Cho, Tsvi Tlusty, Steve Granick
There is mounting evidence that enzyme diffusivity is enhanced when the enzyme is catalytically active. Here, using superresolution microscopy [stimulated emission-depletion fluorescence correlation spectroscopy (STED-FCS)], we show that active enzymes migrate spontaneously in the direction of lower substrate concentration ("antichemotaxis") by a process analogous to the run-and-tumble foraging strategy of swimming microorganisms and our theory quantifies the mechanism. The two enzymes studied, urease and acetylcholinesterase, display two families of transit times through subdiffraction-sized focus spots, a diffusive mode and a ballistic mode, and the latter transit time is close to the inverse rate of catalytic turnover...
December 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29252885/a-rare-case-of-isolated-salmonella-species-group-b-sacroiliitis-in-a-healthy-collegiate-level-swimmer-a-case-report
#14
Hayley E Ennis, Marc N Ialenti, Jean Jose, Michael Baraga
CASE: We present a case of isolated Salmonella species group B sacroiliitis in a healthy 19-year-old collegiate-level swimmer with no known risk factors. To our knowledge, there are no similar cases described in the current literature. CONCLUSION: Pyogenic sacroiliitis (PS) is a rare form of septic arthritis, especially in adults. PS is most commonly seen in the setting of intravenous drug use or in an immunocompromised patient. If a patient does not fit either of these demographics, PS initially can be a difficult diagnosis because of its rarity and vague symptomatology...
July 2017: JBJS Case Connector
https://www.readbyqxmd.com/read/29251174/reliability-and-validity-of-a-modified-3-minute-all-out-swimming-test-in-elite-swimmers
#15
Lachlan J G Mitchell, David B Pyne, Philo U Saunders, Ben Rattray
Critical speed (CS) testing is useful in monitoring training in swimmers, however, completing a series of time trials (TTs) regularly is time-consuming. The 3-minute test may be a solution with positive initial findings. This investigation examined whether a modified 3-minute test (12 × 25 m) could assess CS and supra-CS distance capacity (D') in swimmers. A series of 12 × 25 m intervals were completed unpaced at maximal effort, interspersed with 5 s rest periods. The model speed = aebt + c was fitted to the data and integrated to calculate D'...
December 17, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29249572/the-changes-in-classical-and-nonlinear-parameters-after-a-maximal-bout-to-elicit-fatigue-in-competitive-swimming
#16
Tiago M Barbosa, Simin Chen, Jorge E Morais, Mário J Costa, Nuno Batalha
The aim was to assess the effect of fatigue on linear and nonlinear parameters in swimming. Twenty-four fitness-oriented swimmers performed a maximal bout of 100 m at front-crawl to elicit fatigue. Before (pre-) and immediately after (post-test) the bout, participants swam an all-out 25 m to derive the speed fluctuation (dv), approximate entropy (ApEn) and fractal dimension (FD) from the speed-time series collected by a speedo-meter. Swim speed was 10.85% slower in the post-test than in the pre-test (p < ...
December 15, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29249177/active-recovery-intervals-restore-initial-performance-after-repeated-sprints-in-swimming
#17
Ioannis D Kostoulas, Argyris G Toubekis, Thrasivoulos Paxinos, Konstantinos Volaklis, Savvas P Tokmakidis
The purpose of this study was to examine the effects of active recovery (AR) and passive recovery (PR) using short (2-min) and long (4-min) intervals on swimming performance. Twelve male competitive swimmers completed a progressively increasing speed test of 7 × 200-m swimming repetitions to locate the speed before the onset of curvilinear increase in blood lactate concentration (LT1). Subsequently, performance time of 6 × 50-m sprints was recorded during four different conditions: (i) 2-min PR (PR-2), (ii) 4-min PR (PR-4), (iii) 2-min AR (AR-2) and (iv) 4-min AR (AR-4) intervals...
December 17, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29246115/training-the-salmon-s-genes-influence-of-aerobic-exercise-swimming-performance-and-selection-on-gene-expression-in-atlantic-salmon
#18
Nicholas A Robinson, Gerrit Timmerhaus, Matthew Baranski, Øivind Andersen, Harald Takle, Aleksei Krasnov
BACKGROUND: Farmed and wild Atlantic salmon are exposed to many infectious and non-infectious challenges that can cause mortality when they enter the sea. Exercise before transfer promotes growth, health and survival in the sea. Swimming performance in juveniles at the freshwater parr stage is positively associated with resistance to some diseases. Genetic variation is likely to affect response to exercise. In this study we map genetic differences associated with aerobic exercise, swimming performance and genetic origin...
December 15, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29243668/chemotactic-droplet-swimmers-in-complex-geometries
#19
Chenyu Jin, Babak Vajdi Hokmabad, Kyle Anthony Baldwin, Corinna Charlotte Maass
Chemotaxis and auto-chemotaxis are key mechanisms in the dynamics of micro-organisms, e.g. in the acquisition of nutrients and in the communication between individuals, influencing the collective behaviour. However, chemical signalling and the natural environment of biological swimmers are generally complex, making them hard to access analytically. We present a well-controlled, tunable artificial model to study chemotaxis and autochemotaxis in complex geometries, using microfluidic assays of self-propelling oil droplets in an aqueous surfactant solution...
December 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29242866/the-curved-kinetic-boundary-layer-of-active-matter
#20
Wen Yan, John F Brady
A body submerged in active matter feels the swim pressure through a kinetic accumulation boundary layer on its surface. The boundary layer results from a balance between translational diffusion and advective swimming and occurs on the microscopic length scale . Here , DT is the Brownian translational diffusivity, τR is the reorientation time and l = U0τR is the swimmer's run length, with U0 the swim speed [Yan and Brady, J. Fluid. Mech., 2015, 785, R1]. In this work we analyze the swim pressure on arbitrary shaped bodies by including the effect of local shape curvature in the kinetic boundary layer...
December 15, 2017: Soft Matter
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