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https://www.readbyqxmd.com/read/28538303/examining-fundamental-movement-competency-and-closed-chain-upper-extremity-dynamic-balance-in-swimmers
#1
Garrett S Bullock, Nate Brookreson, Amy M Knab, Robert J Butler
Bullock, GS, Brookreson, N, Knab, AM, and Butler, RJ. Examining fundamental movement competency and closed-chain upper-extremity dynamic balance in swimmers. J Strength Cond Res 31(6): 1544-1551, 2017-Abnormal fundamental movement patterns and upper-quarter dynamic balance are proposed mechanisms affecting athletic performance and injury risk. There are few studies investigating functional movement and closed-chain upper-extremity dynamic stability in swimmers. The purpose of this study was to determine differences in fundamental movement competency and closed-chain upper-extremity dynamic balance, using the Functional Movement Screen (FMS) and Upper-Quarter Y Balance Test (YBT-UQ), of high school (HS; n = 70) and collegiate (COL; n = 70) swimmers...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28533550/coral-larvae-are-poor-swimmers-and-require-fine-scale-reef-structure-to-settle
#2
Tom Hata, Joshua S Madin, Vivian R Cumbo, Mark Denny, Joanna Figueiredo, Saki Harii, Christopher J Thomas, Andrew H Baird
Reef coral assemblages are highly dynamic and subject to repeated disturbances, which are predicted to increase in response to climate change. Consequently there is an urgent need to improve our understanding of the mechanisms underlying different recovery scenarios. Recent work has demonstrated that reef structural complexity can facilitate coral recovery, but the mechanism remains unclear. Similarly, experiments suggest that coral larvae can distinguish between the water from healthy and degraded reefs, however, whether or not they can use these cues to navigate to healthy reefs is an open question...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28520707/using-molecular-characterization-to-support-investigations-of-aquatic-facility-associated-outbreaks-of-cryptosporidiosis-alabama-arizona-and-ohio-2016
#3
Michele C Hlavsa, Dawn M Roellig, Matthew H Seabolt, Amy M Kahler, Jennifer L Murphy, Taishayla K McKitt, Evelyn F Geeter, Ron Dawsey, Sherri L Davidson, Thuy N Kim, Theresa H Tucker, Sally Ann Iverson, Brenna Garrett, Nicole Fowle, Jennifer Collins, Gregory Epperson, Scott Zusy, Joli R Weiss, Ken Komatsu, Edwin Rodriguez, J Gage Patterson, Rebecca Sunenshine, Brandi Taylor, Katie Cibulskas, Lynn Denny, Keoni Omura, Boris Tsorin, Kathleen E Fullerton, Lihua Xiao
Cryptosporidiosis is a nationally notifiable gastrointestinal illness caused by parasitic protozoa of the genus Cryptosporidium, which can cause profuse, watery diarrhea that can last up to 2-3 weeks in immunocompetent patients and can lead to life-threatening wasting and malabsorption in immunocompromised patients. Fecal-oral transmission of Cryptosporidium oocysts, the parasite's infectious life stage, occurs via ingestion of contaminated recreational water, drinking water, or food, or following contact with infected persons or animals, particularly preweaned bovine calves (1)...
May 19, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28518005/safety-considerations-for-medical-staff-and-patients-who-fly-over-water-in-a-helicopter-for-work-or-recreation
#4
Christopher J Brooks, Conor V MacDonald
BACKGROUND: Around 25% of people involved in a helicopter accident in water do not survive. From time to time, physicians and their medical staff are required to fly over water in a helicopter to attend one or more seriously ill patients. Many will have had little or no experience of the issues involved if the helicopter has an accident in the water. Also as Family Practitioners, Aeromedical Examiners, and Flight Surgeons, they are asked to provide advice to patients, travel agents, and airline booking agents about whether an overwater helicopter flight is advisable or not...
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28511732/outbreak-of-diarrhoea-among-participants-of-a-triathlon-and-a-duathlon-on-12-july-2015-in-utrecht-the-netherlands
#5
S Parkkali, R Joosten, E Fanoy, R Pijnacker, J VAN Beek, D Brandwagt, W VAN Pelt
On 12 July 2015, a triathlon competition with 900 participants took place in Utrecht, the Netherlands. An outbreak investigation was initiated after 56 participants reported health complaints. An online questionnaire was sent to 700 participants. Stool specimens from six participants and four water specimens were collected from the swimming location. A total of 239 participants completed the questionnaire (response rate: 34%), 73 (31%) of them met the case definition for acute gastrointestinal illness (AGI)...
May 17, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28509868/compact-eucapnic-voluntary-hyperpnoea-apparatus-for-exercise-induced-respiratory-disease-detection
#6
Lulu Wang, Ahmed Al-Jumaily
Eucapnic voluntary hyperpnoea (EVH) challenge provides objective criteria for exercise-induced asthma (EIA) or exercise-induced bronchoconstriction (EIB), and it was recommended to justify the use of inhaled β₂-agonists by athletes for the Olympics. This paper presents the development of a compact and easy-to-use EVH apparatus for assessing EIB in human subjects. The compact apparatus has been validated on human subjects and the results have been compared to the conventional EVH system. Twenty-two swimmers, including eleven healthy subjects and eleven subjects who had been physician-diagnosed with asthma, were recruited from sport and recreation centers throughout Auckland, New Zealand...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28508746/ciliomotor-circuitry-underlying-whole-body-coordination-of-ciliary-activity-in-the-platynereis-larva
#7
Csaba Verasztó, Nobuo Ueda, Luis A Bezares-Calderón, Aurora Panzera, Elizabeth A Williams, Réza Shahidi, Gáspár Jékely
Ciliated surfaces harbouring synchronously beating cilia can generate fluid flow or drive locomotion. In ciliary swimmers, ciliary beating, arrests, and changes in beat frequency are often coordinated across extended or discontinuous surfaces. To understand how such coordination is achieved, we studied the ciliated larvae of Platynereis dumerilii, a marine annelid. Platynereis larvae have segmental multiciliated cells that regularly display spontaneous coordinated ciliary arrests. We used whole-body connectomics, activity imaging, transgenesis, and neuron ablation to characterize the ciliomotor circuitry...
May 16, 2017: ELife
https://www.readbyqxmd.com/read/28505815/interaction-of-toroidal-swimmers-in-stokes-flow
#8
Jianjun Huang, Lisa Fauci
A doughnut-shaped object supporting surface rotations was a hypothetical construct proposed by both Taylor and Purcell as a swimmer that would be able to propel itself in a Stokesian fluid because of the irreversibility of its stroke. Here we numerically examine the hydrodynamic interaction of pairs and trios of these free toroidal swimmers. First, we study the axisymmetric case of two toroidal swimmers placed in tandem, and show that a single torus of a corotating pair is more efficient than when it swims alone, but less efficient when paired with a counterrotating partner...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28504290/effect-of-body-deformability-on-microswimming
#9
Jayant Pande, Laura Merchant, Timm Krüger, Jens Harting, Ana-Sunčana Smith
In this work we consider the following question: given a mechanical microswimming mechanism, does increased deformability of the swimmer body hinder or promote the motility of the swimmer? To answer this we run immersed-boundary-lattice-Boltzmann simulations of a microswimmer composed of deformable beads connected with springs. We find that the same deformations in the beads can result in different effects on the swimming velocity, namely an enhancement or a reduction, depending on the other parameters. To understand this we determine analytically the velocity of the swimmer, starting from the forces driving the motion and assuming that the deformations in the beads are known as functions of time and are much smaller than the beads themselves...
May 15, 2017: Soft Matter
https://www.readbyqxmd.com/read/28497283/the-impact-of-resistance-training-on-swimming-performance-a-systematic-review
#10
REVIEW
Emmet Crowley, Andrew J Harrison, Mark Lyons
BACKGROUND: The majority of propulsive forces in swimming are produced from the upper body, with strong correlations between upper body strength and sprint performance. There are significant gaps in the literature relating to the impact of resistance training on swimming performance, specifically the transfer to swimming performance. OBJECTIVE: The aims of this systematic literature review are to (1) explore the transfer of resistance-training modalities to swimming performance, and (2) examine the effects of resistance training on technical aspects of swimming...
May 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28495869/kinematics-of-ram-filter-feeding-and-beat-glide-swimming-in-the-northern-anchovy-engraulis-mordax
#11
Nicholas Carey, Jeremy A Goldbogen
In the dense aquatic environment, the most adept swimmers are streamlined to reduce drag and increase the efficiency of locomotion. However, because they open their mouth to wide gape angles to deploy their filtering apparatus, ram filter feeders apparently switch between diametrically opposite swimming modes; highly efficient, streamlined 'beat-glide' swimming, and ram filter feeding, which has been hypothesized to be a high-cost feeding mode because of presumed increased drag. Ram filter feeding forage fish are thought to play an important role in the flux of nutrients and energy in upwelling ecosystems, however the biomechanics and energetics of this feeding mechanism remain poorly understood...
May 11, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28489717/coliphages-and-gastrointestinal-illness-in-recreational-waters-pooled-analysis-of-six-coastal-beach-cohorts
#12
Jade Benjamin-Chung, Benjamin F Arnold, Timothy J Wade, Kenneth Schiff, John F Griffith, Alfred P Dufour, Stephen B Weisberg, John M Colford
BACKGROUND: Coliphages have been proposed as indicators of fecal contamination in recreational waters because they better mimic the persistence of pathogenic viruses in the environment and wastewater treatment than fecal indicator bacteria. We estimated the association between coliphages and gastrointestinal illness and compared it to the association with culturable enterococci. METHODS: We pooled data from six prospective cohort studies that enrolled coastal beachgoers in California, Alabama, and Rhode Island...
May 9, 2017: Epidemiology
https://www.readbyqxmd.com/read/28488837/allometric-associations-between-body-size-shape-and-100-m-butterfly-speed-performance
#13
Senda Sammoud, Alan M Nevill, Yassine Negra, Raja Bouguezzi, Helmi Chaabene, Younés Hachana
BACKGROUND: This study aimed to estimate the optimal body size, limb--segment length, and girth or breadth ratios associated with 100--m butterfly speed performance in swimmers. METHODS: One--hundred--sixty-seven swimmers as subjects (male: n=103; female: n=64). Anthropometric measurements comprised height, body--mass, skinfolds, arm-span, upper--limb--length, upper--arm, forearm, hand--lengths, lower--limb--length, thigh--length, leg--length, foot--length, arm--relaxed--girth, forearm--girth, wrist--girth, thigh--girth, calf--girth, ankle--girth, biacromial and biiliocristal--breadths...
May 9, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28486734/relationships-among-the-tethered-3-min-all-out-test-maod-and-swimming-performance
#14
Carlos Augusto Kalva-Filho, Alessandro Moura Zagatto, Adelino S R da Silva, Monique Yndawe Castanho, Ronaldo Bucken Gobbi, Claudio Alexandre Gobatto, Marcelo Papoti
To allow the use of the 3-min all-out parameters for anaerobic evaluation, the aim of the present study was to test its relationships to maximal accumulated oxygen deficit (MAOD) and short/middle distance performances. 9 swimmers (age 19±1 years, height 176.7±6.1 cm and body mass 68.7±6.1 kg) underwent a 3-min all-out test and MAOD procedures (10 submaximal efforts and one exhaustive effort at maximal force attained during a graded exercise test); both were applied using tethered swimming conditions...
May 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28486565/new-evaluation-index-for-the-retainability-of-a-swimmer-s-horizontal-posture
#15
Yasunori Watanabe, Kohji Wakayoshi, Teruo Nomura
This study aims to investigate the effect of changes in buoyancy when a swimmer respires in a horizontal posture. We attempted to evaluate the levelness of swimmers' streamline posture by simultaneously measuring the lung capacity and buoyancy under water. The buoyancy was measured based on the changes in the vertical loads of the upper and lower limbs on the subjects' streamline posture under water. The horizontal x-axis as lung ventilation and the vertical y-axis as buoyancy forms a linear equation y = ax + b...
2017: PloS One
https://www.readbyqxmd.com/read/28486329/effect-of-short-term-coenzyme-q10-supplementation-and-pre-cooling-on-serum-endogenous-antioxidant-enzymes-of-elite-swimmers
#16
Ali Emami, Asghar Tofighi, Siamak A Rezayi, Behnaz B Gilani
This study aimed to investigate the effect of the use of a two-week pre-cooling strategy and supplementation coenzyme Q10 (CoQ10) on superoxide dismutase (SOD), catalase (CAT), and serum glutathione peroxidase (GPx) in elite, adolescent swimmers during heavy and regular trainings and recording of freestyle swimming. 36 healthy males (mean ± SD; age: 17.5±1.1, body fat content: 14.55±1.75%) were randomly selected and divided into four groups of CoQ10 (300 mg/d), precooling (immersion in the water at 18 ± 0...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28482368/validity-of-postexercise-measurements-to-estimate-peak-vo2-in-200-m-and-400-m-maximal-swims
#17
Ferran A Rodríguez, Diego Chaverri, Xavier Iglesias, Thorsten Schuller, Uwe Hoffmann
To assess the validity of postexercise measurements to estimate oxygen uptake (V˙O2) during swimming, we compared V˙O2 measured directly during an all-out 200-m swim with measurements estimated during 200-m and 400-m maximal tests using several methods, including a recent heart rate (HR)/V˙O2 modelling procedure. 25 elite swimmers performed a 200-m maximal swim where V˙O2 was measured using a swimming snorkel connected to a gas analyzer. The criterion variable was V˙O2 in the last 20 s of effort, which was compared with the following V˙O2peak estimates: 1) first 20-s average; 2) linear backward extrapolation (BE) of the first 20 and 30 s, 3×20-s, 4×20-s, and 3×20-s or 4×20-s averages; 3) semilogarithmic BE at the same intervals; and 4) predicted V˙O2peak using mathematical modelling of 0-20 s and 5-20 s during recovery...
May 8, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28481218/propulsive-performance-of-an-under-actuated-robotic-ribbon-fin
#18
Hanlin Liu, Oscar Curet
Many aquatic animals propelled by elongated undulatory fins can perform complex maneuvers and swim with high efficiency at low speeds. In this type of swimming, one or multiple waves travel along the flexible fin that is composed of fin rays (for bony fish) interconnected with an elastic membrane. In this work, we explore the potential benefits or disadvantages of using passive fin motion based on the coupling of fluid-structure interaction and the elasto-mechanical responses of the undulatory fin. The motivation of this work is to understand how an under-actuated undulating fin can modify its active and passive fin motion to effectively control the hydrodynamic forces and propulsive efficiency...
May 8, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28474870/reasons-for-dropout-in-swimmers-differences-between-gender-and-age-and-intentions-to-return-to-competition
#19
Diogo M Monteiro, Daniel A Marinho, João M Moutão, Anabela P Vitorino, Raúl N Antunes, Luís S Cid
BACKGROUND: This study's main purpose was to analyse reasons for dropout in competitive swimmers and differences between gender and age groups. The influence of dropout on swimmers intentions to return to competition, invariance across gender and validation of Questionnaire of Reasons for Attrition were also analysed. METHODS: Study 1 - 366 athletes participated (n=366; mean age 15.96 SD 5.99) and the data gathered was used for the exploratory analysis, and data gathered on 1008 athletes were used for the confirmatory analysis and the structural equations (n=1,008; mean age 16...
April 26, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28471718/mechanical-power-thrust-power-and-propelling-efficiency-relationships-with-elite-sprint-swimming-performance
#20
Giorgio Gatta, Matteo Cortesi, Ian Swaine, Paola Zamparo
The purpose of this study was to explore the relationships between mechanical power, thrust power, propelling efficiency and sprint performance in elite swimmers. Mechanical power was measured in 12 elite sprint male swimmers: (1) in the laboratory, by using a whole-body swimming ergometer (W'TOT) and (2) in the pool, by measuring full tethered swimming force (FT) and maximal swimming velocity (Vmax): W'T = FT · Vmax. Propelling efficiency (ηP) was estimated based on the "paddle wheel model" at Vmax. Vmax was 2...
May 4, 2017: Journal of Sports Sciences
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