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https://www.readbyqxmd.com/read/28732034/neglecting-the-call-of-the-wild-captive-frogs-like-the-sound-of-their-own-voice
#1
Luiza Figueiredo Passos, Gerardo Garcia, Robert John Young
Acoustic communication is highly influential in the expression of social behavior by anuran amphibians, transmitting information about the individual's physical condition and motivation. We studied the phonotactic (approach movements) responses of wild and captive male golden mantella frogs to conspecific wild and captive playback calls to determine the impact of captivity on social behaviour mediated by vocalisations. Calls were recorded from one wild and two captive populations. Phonotaxis experiments were then conducted by attracting M...
2017: PloS One
https://www.readbyqxmd.com/read/28728471/implementing-technical-refinement-in-high-level-athletics-exploring-the-knowledge-schemas-of-coaches
#2
Philip E Kearney, Howie J Carson, Dave Collins
This paper explores the approaches adopted by high-level field athletics coaches when attempting to refine an athlete's already well-established technique (long and triple jump and javelin throwing). Six coaches, who had all coached multiple athletes to multiple major championships, took part in semi-structured interviews focused upon a recent example of technique refinement. Data were analysed using a thematic content analysis. The coaching tools reported were generally consistent with those advised by the existing literature, focusing on attaining "buy-in", utilising part-practice, restoring movement automaticity and securing performance under pressure...
July 21, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28727643/improving-early-adolescent-girls-motor-skill-a-cluster-randomized-controlled-trial
#3
Natalie Lander, Philip J Morgan, Jo Salmon, Lisa M Barnett
BACKGROUND: Physical activity (PA) levels decline substantially during adolescence, and are consistently lower in girls. Competency in a range of fundamental movement skills (FMS) may serve as a protective factor for the decline in PA typically observed in adolescent girls; yet, girls' mastery in FMS is low. Whilst interventions can improve FMS, there is a lack of interventions targeting girls, and very few are conducted in high schools. Additionally, interventions are usually conducted by researchers, not teachers, and thus have little chance of being embedded into curricula...
July 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28723822/biomechanical-differences-in-female-basketball-and-soccer-players-during-multi-directional-jump-landings
#4
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament injury prevention programs are less successful in basketball than soccer and may be due to distinct movement strategies that these athletes develop from sport-specific training. The purpose of this study was to identify biomechanical differences between female basketball and soccer players during multi-directional jump landings. Lower extremity biomechanics of eighty-nine female athletes who played competitive basketball (n=40) or soccer (n=49) at the middle- or high-school level were analyzed with three-dimensional motion analysis during a drop vertical jump (DVJ), double- (SAG-DL) and single-leg forward jump (SAG-SL), and double- (FRONT-DL) and single-leg (FRONT-SL) lateral jump...
July 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28723414/omega-3-polyunsaturated-fatty-acids-as-a-treatment-strategy-for-nonalcoholic-fatty-liver-disease
#5
REVIEW
Donald B Jump, Kelli A Lytle, Christopher M Depner, Sasmita Tripathy
Obese and type 2 diabetic (T2DM) patients have a high prevalence of nonalcoholic fatty liver disease (NAFLD). NAFLD is a continuum of chronic liver diseases ranging from benign hepatosteatosis to nonalcoholic steatohepatitis (NASH), cirrhosis and primary hepatocellular cancer (HCC). Because of its strong association with the obesity epidemic, NAFLD is rapidly becoming a major public health concern worldwide. Surprisingly, there are no FDA approved NAFLD therapies; and current therapies focus on the co-morbidities associated with NAFLD, namely, obesity, hyperglycemia, dyslipidemia, and hypertension...
July 16, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28719765/beetroot-juice-is-more-beneficial-than-sodium-nitrate-for-attenuating-muscle-pain-after-strenuous-eccentric-bias-exercise
#6
Tom Clifford, Glyn Howatson, Daniel J West, Emma J Stevenson
The aim of this study was to compare the effects of beetroot juice (BTJ) and a nitrate only drink (sodium nitrate; SN) on indices of exercise-induced muscle damage (EIMD). Thirty recreationally active males consumed either BTJ (n=10), a nitrate matched SN drink (n=10) or an isocaloric placebo (PLA; n=10) immediately, 24 and 48 h after performing 100 drop jumps. To assess muscle damage, maximal isometric voluntary contractions (MIVC), countermovement jumps (CMJ), pressure-pain threshold (PPT), creatine kinase (CK) and high sensitivity C-reactive protein (hs-CRP) were measured pre, immediately post, 24, 48 and 72 h following the drop jumps...
July 18, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28719740/tuning-superhydrophobic-nanostructures-to-enhance-jumping-droplet-condensation
#7
Megan D Mulroe, Bernadeta R Srijanto, S Farzad Ahmadi, C Patrick Collier, Jonathan B Boreyko
It was recently discovered that condensation growing on a nanostructured superhydrophobic surface can spontaneously jump off the surface, triggered by naturally occurring coalescence events. Many reports have observed that droplets must grow to a size of order 10 μm before jumping is enabled upon coalescence; however, it remains unknown how the critical jumping size relates to the topography of the underlying nanostructure. Here, we characterize the dynamic behavior of condensation growing on six different superhydrophobic nanostructures, where the topography of the nanopillars was systematically varied...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719187/exploring-the-role-of-habitat-on-the-wettability-of-cicada-wings
#8
Junho Oh, Catherine Dana, Sungmin Hong, Jessica K Roman, Kyoo D Jo, Je W Hong, Jonah Nguyen, Donald M Cropek, Marianne Alleyne, Nenad Miljkovic
Evolutionary pressure has pushed the wings of many insect species to develop micro/nanostructures that can significantly affect wettability and enable functionalities such as droplet jumping, self-cleaning, anti-fogging, anti-microbial, and anti-reflectivity. Significant effort is underway to understand the wing surface structure to establish rational design tools for the development of novel engineered materials. Most studies, however, have focused on superhydrophobic wings obtained from a single insect species, in particular, the Psaltoda claripennis cicada...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28716970/prolonged-force-depression-after-mechanically-demanding-contractions-is-largely-independent-of-ca-2-and-reactive-oxygen-species
#9
Sigitas Kamandulis, Felipe de Souza Leite, Andres Hernández, Abram Katz, Marius Brazaitis, Joseph D Bruton, Tomas Venckunas, Nerijus Masiulis, Dalia Mickeviciene, Nerijus Eimantas, Andrejus Subocius, Dilson E Rassier, Albertas Skurvydas, Niklas Ivarsson, Håkan Westerblad
Increased production of reactive oxygen/nitrogen species (ROS) and impaired cellular Ca(2+) handling are implicated in the prolonged low-frequency force depression (PLFFD) observed in skeletal muscle after both metabolically and mechanically demanding exercise. Metabolically demanding high-intensity exercise can induce PLFFD accompanied by ROS-dependent fragmentation of the sarcoplasmic reticulum Ca(2+) release channels, the ryanodine receptor (RyR)-1. We tested whether similar changes occur after mechanically demanding eccentric contractions...
July 17, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28715199/jumping-hurdles-peptides-able-to-overcome-biological-barriers
#10
Macarena Sánchez-Navarro, Meritxell Teixidó, Ernest Giralt
The cell membrane, the gastrointestinal tract, and the blood-brain barrier (BBB) are good examples of biological barriers that define and protect cells and organs. They impose different levels of restriction, but they also share common features. For instance, they all display a high lipophilic character. For this reason, hydrophilic compounds, like peptides, proteins, or nucleic acids have long been considered as unable to bypass them. However, the discovery of cell-penetrating peptides (CPPs) opened a vast field of research...
July 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28714767/comparison-of-methods-of-calculating-dynamic-strength-index
#11
Paul Comfort, Christopher Thomas, Thomas Dos'Santos, Paul A Jones, Timothy J Suchomel, John J McMahon
PURPOSE: To determine the reliability and variability of dynamic strength index (DSI) calculated from squat jump (SJ) (DSI-SJ) versus countermovement jump (CMJ) (DSI-CMJ) peak force (PF) and to compare DSI values between methods. METHODS: Male youth soccer and rugby league players (n = 27; age = 17.2 ± 0.7 years; height = 173.9 ± 5.7 cm; body mass = 71.1 ± 7.2 kg) performed 3 trials of the SJ, CMJ and isometric mid-thigh pull (IMTP), on two separate days. DSI was calculated by dividing the PF during each jump by the IMTP PF...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714230/wet-spun-superelastic-graphene-aerogel-millispheres-with-group-effect
#12
Xiaoli Zhao, Weiquan Yao, Weiwei Gao, Hao Chen, Chao Gao
Graphene aerogel has attracted great attention due to its unique properties, such as ultralow density, superelasticity, and high specific surface area. It shows huge potential in energy devices, high-performance pressure sensors, contaminates adsorbents, and electromagnetic wave absorbing materials. However, there still remain some challenges to further promote the development and real application of graphene aerogel including cost-effective scalable fabrication and miniaturization with group effect. This study shows millimeter-scale superelastic graphene aerogel spheres (GSs) with group effect and multifunctionality...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28712025/side-to-side-asymmetries-in-landing-mechanics-from-a-drop-vertical-jump-test-are-not-related-to-asymmetries-in-knee-joint-laxity-following-anterior-cruciate-ligament-reconstruction
#13
Christophe A G Meyer, Paul Gette, Caroline Mouton, Romain Seil, Daniel Theisen
PURPOSE: Asymmetries in knee joint biomechanics and increased knee joint laxity in patients following anterior cruciate ligament reconstruction (ACLR) are considered risk factors for re-tear or early onset of osteoarthritis. Nevertheless, the relationship between these factors has not been established. The aim of the study was to compare knee mechanics during landing from a bilateral drop vertical jump in patients following ACLR and control participants and to study the relationship between side-to-side asymmetries in landing mechanics and knee joint laxity...
July 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28709222/population-density-equations-for-stochastic-processes-with-memory-kernels
#14
Yi Ming Lai, Marc de Kamps
We present a method for solving population density equations (PDEs)--a mean-field technique describing homogeneous populations of uncoupled neurons-where the populations can be subject to non-Markov noise for arbitrary distributions of jump sizes. The method combines recent developments in two different disciplines that traditionally have had limited interaction: computational neuroscience and the theory of random networks. The method uses a geometric binning scheme, based on the method of characteristics, to capture the deterministic neurodynamics of the population, separating the deterministic and stochastic process cleanly...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28707506/perception-action-coupling-in-complex-game-play-exploring-the-quiet-eye-in-contested-basketball-jump-shots
#15
André Klostermann, Derek Panchuk, Damian Farrow
The duration of the final fixation before movement initiation - a gaze strategy labelled quiet eye - has been found to explain differences in motor expertise and performance in precision tasks. To date, research only addressed this phenomenon in situations without adversarial constraints. In the present study, we compared the quiet-eye behaviour of intermediately-skilled and highly-skilled basketball players in defended vs. undefended game situations. We predicted differences in quiet-eye duration as a function of skill and performance particularly resulting from late quiet-eye offsets...
July 14, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28706964/residual-stress-distribution-analysis-of-heat-treated-aps-tbc-using-image-based-modelling
#16
Chun Li, Xun Zhang, Ying Chen, James Carr, Simon Jacques, Julia Behnsen, Marco di Michiel, Ping Xiao, Robert Cernik
We carried out a residual stress distribution analysis in a APS TBC throughout the depth of the coatings. The samples were heat treated at 1150 °C for 190 h and the data analysis used image based modelling based on the real 3D images measured by Computed Tomography (CT). The stress distribution in several 2D slices from the 3D model is included in this paper as well as the stress distribution along several paths shown on the slices. Our analysis can explain the occurrence of the "jump" features near the interface between the top coat and the bond coat...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28704316/effects-of-a-tapering-period-on-physical-condition-in-soccer-players
#17
Maria Reyes Beltran-Valls, Guillermo Camarero-López, José Vicente Beltran-Garrido, Pau Cecilia-Gallego
The aim of this research was to analyze the effects of a two-week step tapering period on lower-limb muscle power, change of direction (COD) and acceleration capacities, and on the stress-recovery state in an amateur soccer team. Twenty-two male players were included in the study. Following a six-week progressive training, the sample was divided into: experimental group (n = 11), who did a two-week period of taper in which training volume was 50% reduced (intensity was kept high) and control group (n = 11), which kept on with the training...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28701553/walking-like-an-ant-a-quantitative-and-experimental-approach-to-understanding-locomotor-mimicry-in-the-jumping-spider-myrmarachne-formicaria
#18
Paul S Shamble, Ron R Hoy, Itai Cohen, Tsevi Beatus
Protective mimicry, in which a palatable species avoids predation by being mistaken for an unpalatable model, is a remarkable example of adaptive evolution. These complex interactions between mimics, models and predators can explain similarities between organisms beyond the often-mechanistic constraints typically invoked in studies of convergent evolution. However, quantitative studies of protective mimicry typically focus on static traits (e.g. colour and shape) rather than on dynamic traits like locomotion...
July 12, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28699923/the-effects-of-moderate-versus-high-load-resistance-training-on-muscle-growth-body-composition-and-performance-in-collegiate-women
#19
Jason M Cholewa, Fabricio E Rossi, Christopher MacDonald, Amy Hewins, Samantha Gallo, Ashley Micenski, Layne Norton, Bill I Campbell
Twenty young women (20.3+1.5 years, 164+6 cm, 68.7+13.8 kg) without prior structured resistance training experience were recruited for this study. Body composition (BodPod), compartmental water (Bioelectrical Impedance), 7-site skinfold, and arm and thigh CSA were assessed pre- and post- 8 week training. Performance testing consisted of vertical jump, 3 kg chest pass initial velocity, squat 1RM and overhead press 1RM. Following 2 weeks of familiarization training, subjects were matched for body composition and relative squat strength, and randomly assigned to either a high- (HL: n=10; 4 sets of 5-7 repetitions) or moderate-load (ML: n=10; 2 sets of 10-14 repetitions) group that completed 6-7 exercises per day performed to momentary muscular failure...
June 2, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28699620/aerodynamics-and-flow-features-of-a-damselfly-in-takeoff-flight
#20
Ayodeji Toluwanimi Bode-Oke, Samane Zeyghami, Haibo Dong
Flight initiation is fundamental for survival, escape from predators and lifting payload from one place to another in biological fliers and can be broadly classified into jumping and non-jumping takeoffs. During jumping takeoffs, the legs generate most of the initial impulse. Whereas the wings generate most of the forces in non-jumping takeoffs, which are usually voluntary, slow, and stable. It is of great interest to understand how these non-jumping takeoffs occur and what strategies insects use to generate large amount of forces required for this highly demanding flight initiation mode...
July 12, 2017: Bioinspiration & Biomimetics
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