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https://www.readbyqxmd.com/read/28632062/skeleton-sled-velocity-profiles-a-novel-approach-to-understand-critical-aspects-of-the-elite-athletes-start-phases
#1
Steffi L Colyer, Keith A Stokes, James L J Bilzon, Aki I T Salo
The development of velocity across the skeleton start is critical to performance, yet poorly understood. We aimed to understand which components of the sled velocity profile determine performance and how physical abilities influence these components. Thirteen well-trained skeleton athletes (>85% of athletes in the country) performed dry-land push-starts alongside countermovement jump and sprint tests at multiple time-points. A magnet encoder attached to the sled wheel provided velocity profiles, which were characterised using novel performance descriptors...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28632050/effects-of-turf-and-cleat-footwear-on-plantar-load-distributions-in-adolescent-american-football-players-during-resisted-pushing
#2
Jeffrey B Taylor, Anh-Dung Nguyen, Janet R Griffin, Kevin R Ford
Metatarsal and midfoot injuries are common in American football. Footwear design may influence injury rates by altering plantar foot loading patterns in these regions. The purpose of this study was to determine the effect of cleat design on in-shoe plantar foot loading during a football-specific, resisted pushing task. Twenty competitive football players (age 14.7 ± 1.8 years, height 1.72 ± 0.10 m, and mass 71.8 ± 26.9 kg) completed three trials of pushing a weighted sled at maximal effort in a standard shoe (CLEAT) and artificial turf-specific shoe (TURF), with flexible in-shoe force measuring insoles...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28619691/a-mouse-model-of-antepartum-stillbirth
#3
Anum Rahman, Lindsay S Cahill, Yu-Qing Zhou, Johnathan Hoggarth, Monique Y Rennie, Mike Seed, Christopher K Macgowan, John C Kingdom, S Lee Adamson, John G Sled
BACKGROUND: Many stillbirths of normally-formed fetuses in the third trimester could be prevented via delivery if reliable means to anticipate this outcome existed. However, since the etiology of these stillbirths is often unexplained and, although the underlying mechanism is presumed to be hypoxia from "placental insufficiency", the placentas often appear normal on histopathologic examination. Gestational age is a risk factor for antepartum stillbirth, with a rapid rise in stillbirth rates after 40 weeks gestation...
June 12, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28613265/a-novel-approach-to-measuring-muscle-mechanics-in-vehicle-collision-conditions
#4
Simon Krašna, Srđan Đorđević, Marija Hribernik, Ana Trajkovski
The aim of the study was to evaluate a novel approach to measuring neck muscle load and activity in vehicle collision conditions. A series of sled tests were performed on 10 healthy volunteers at three severity levels to simulate low-severity frontal impacts. Electrical activity-electromyography (EMG)-and muscle mechanical tension was measured bilaterally on the upper trapezius. A novel mechanical contraction (MC) sensor was used to measure the tension on the muscle surface. The neck extensor loads were estimated based on the inverse dynamics approach...
June 14, 2017: Sensors
https://www.readbyqxmd.com/read/28601748/development-of-thoracic-injury-risk-functions-for-the-thor-atd
#5
Gerald S Poplin, Timothy L McMurry, Jason L Forman, Joseph Ash, Daniel P Parent, Matthew J Craig, Eric Song, Richard Kent, Greg Shaw, Jeff Crandall
The Test Device for Human Occupant Restraint (THOR) 50th percentile male anthropomorphic test device (ATD) aims to improve the ability to predict the risk of chest injury to restrained automobile occupants by measuring dynamic chest deflection at multiple locations. This research aimed to describe the methods for developing a thoracic injury risk function (IRF) using the multi-point chest deflection metrics from the 50th percentile male THOR Metric ATD with the SD-3 shoulder and associating to post-mortem human subjects (PMHS) outcomes that were matched on identical frontal and frontal-oblique impact sled testing conditions...
June 8, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28594247/differences-in-the-kinematics-of-booster-seated-pediatric-occupants-using-two-different-car-seats
#6
O Juste-Lorente, M Maza, A I Lorente, F J Lopez-Valdes
OBJECTIVE: The objective of this paper is to compare the performance of forward-facing Child Restraint Systems (CRS) mounted on two different seats. METHODS: Two different ATD (Anthropomorphic Test Device) sizes (P3 and P6), using the same child restraint system (a non-ISOFIX high-back booster seat) were exposed to the ECE R44 regulatory deceleration pulse in a deceleration sled. Two different seats (seat A, seat B) were used. Three repetitions per ATD and mounting seat were done, resulting in a total of 12 sled crashes...
June 8, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28584428/a-pilot-randomized-controlled-trial-of-comparison-between-extended-daily-hemodialysis-and-continuous-veno-venous-hemodialysis-in-patients-of-acute-kidney-injury-with-septic-shock
#7
Shakti Bedanta Mishra, Afzal Azim, Narayan Prasad, Ratendra Kumar Singh, Banani Poddar, Mohan Gurjar, Arvind Kumar Baronia
AIM OF STUDY: Acute kidney injury (AKI) is common in patients of septic shock. There is sparse data comparing sustained low-efficiency dialysis (SLED) and continuous renal replacement therapy (CRRT) in patients with septic shock. MATERIALS AND METHODS: This is a prospective randomized study in a 12-bedded medical intensive care unit. After clearance from institute's ethics committee and obtaining informed consent from the relatives, sixty adult patients with septic shock who were to undergo dialysis for AKI were included in the study...
May 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28557999/treatment-of-aki-in-developing-and-developed-countries-an-international-survey-of-pediatric-dialysis-modalities
#8
Rupesh Raina, Abigail M Chauvin, Timothy Bunchman, David Askenazi, Akash Deep, Michael J Ensley, Vinod Krishnappa, Sidharth Kumar Sethi
HYPOTHESIS: Acute kidney injury (AKI) is a common cause of morbidity and mortality worldwide, with a pediatric incidence ranging from 19.3% to 24.1%. Treatment of pediatric AKI is a source of debate in varying geographical regions. Currently CRRT is the treatment for pediatric AKI, but limitations due to cost and accessibility force use of adult equipment and other therapeutic options such as peritoneal dialysis (PD) and hemodialysis (HD). It was hypothesized that more cost-effective measures would likely be used in developing countries due to lesser resource availability...
2017: PloS One
https://www.readbyqxmd.com/read/28548611/relationships-between-knee-extension-moments-during-weighted-and-unweighted-gait-and-strength-measures-that-predict-knee-moments-after-acl-reconstruction
#9
Erin Hartigan, Jennifer Aucoin, Rita Carlson, Melanie Klieber-Kusak, Thomas Murray, Bernadette Shaw, Michael Lawrence
BACKGROUND: Weighted gait increases internal knee extension moment impulses (KEMI) in the anterior cruciate ligament-reconstructed (ACLR) limb; however, limb differences persist. HYPOTHESES: (1) KEMI during normal gait will influence KEMI during weighted gait and (2) peak knee extension (PKE) torque and time to reach PKE torque will predict KEMI during gait tasks. STUDY DESIGN: Descriptive laboratory study. METHODS: Twenty-four women and 14 men completed 3 gait tasks (unweighted, vest, sled) and strength testing after discharge from rehabilitation and clearance to return to sports...
May 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28548156/a-field-deployed-surface-plasmon-resonance-spr-sensor-for-rdx-quantification-in-environmental-waters
#10
Thibault Brulé, Geneviève Granger, Natalia Bukar, Clarisse Deschênes-Rancourt, Thierry Havard, Andreea R Schmitzer, Richard Martel, Jean-Francois Masson
A field-deployable surface plasmon resonance (SPR) sensor is reported for the detection of the energetic material (commonly termed explosives) 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) at ppb concentration in environmental samples. The SPR sensor was first validated under laboratory conditions with uncontaminated natural water samples spiked with known concentrations of RDX near the EPA limit of 2 ppb, which was then applied to monitor environmental samples collected in different downgradient wells near a grenade training range...
May 26, 2017: Analyst
https://www.readbyqxmd.com/read/28548153/accelerating-chemical-reactions-by-molecular-sledding
#11
Lei Zhang, Lifei Zheng, Zhuojun Meng, Konstantin Balinin, Mark Loznik, Andreas Herrmann
The speed-up of covalent bond formation was achieved between a sulfhydryl group and a 2-bromopropionic acid derivative by utilizing sliding peptide-modified substrates. Moreover, a new type of DNA cleaving reagent was developed, consisting of pVIc covalently coupled to verteporfin. This peptide-porphyrin conjugate allowed targeting of DNA and resulted in increased photodegradation of double-stranded nucleic acids.
June 8, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28525779/systematic-review-and-meta-analysis-of-renal-replacement-therapy-modalities-for-acute-kidney-injury-in-the-intensive-care-unit
#12
Danielle M Nash, Sebastian Przech, Ron Wald, Daria O'Reilly
PURPOSE: To compare clinical outcomes among critically ill adults with acute kidney injury (AKI) treated with continuous renal replacement therapy (CRRT), intermittent hemodialysis (IHD) or sustained low efficiency dialysis (SLED). MATERIALS AND METHODS: We completed a systematic review and meta-analysis of studies published in 2015 or earlier using MEDLINE®, EMBASE®, Cochrane databases and grey literature. Eligible studies included randomized clinical trials (RCTs) or prospective cohort studies comparing outcomes of mortality, dialysis dependence or length of stay among critically ill adults receiving CRRT, IHD or SLED to treat AKI...
May 9, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28470247/hydrodynamics-of-defecation
#13
Patricia J Yang, Morgan LaMarca, Candice Kaminski, Daniel I Chu, David L Hu
Animals discharge feces within a range of sizes and shapes. Such variation has long been used to track animals as well as to diagnose illnesses in both humans and animals. However, the physics by which feces are discharged remain poorly understood. In this combined experimental and theoretical study, we investigate the defecation of mammals from cats to elephants using the dimensions of large intestines and feces, videography at Zoo Atlanta, cone-on-plate rheological measurements of feces and mucus, and a mathematical model of defecation...
May 4, 2017: Soft Matter
https://www.readbyqxmd.com/read/28455378/ehmt2-g9a-controls-placental-vascular-maturation-by-activating-the-notch-pathway
#14
Lijun Chi, Abdalla Ahmed, Anna R Roy, Sandra Vuong, Lindsay S Cahill, Laura Caporiccio, John G Sled, Isabella Caniggia, Michael D Wilson, Paul Delgado-Olguin
Defective fetoplacental vascular maturation causes intrauterine growth restriction (IUGR). A transcriptional switch initiates placental maturation where blood vessels elongate. However, cellular mechanisms and regulatory pathways involved are unknown. We show that the histone methyltransferase Ehmt2, also known as G9a, activates the Notch pathway to promote placental vascular maturation. Placental vasculature from embryos with G9a-deficient endothelial progenitor cells failed to expand due to decreased endothelial cell proliferation and increased trophoblast proliferation...
April 28, 2017: Development
https://www.readbyqxmd.com/read/28445477/mitochondrial-respiration-in-highly-aerobic-canines-in-the-non-raced-state-and-after-a-1600-km-sled-dog-race
#15
Benjamin Miller, Karyn Hamilton, Robert Boushel, Katherine Williamson, Verena Laner, Erich Gnaiger, Michael Davis
At the annual Iditarod Race, Alaskan Huskies repeatedly run for up to 8 hours at 16 km/h to complete 1600 km. We previously demonstrated high rates of mitochondrial protein synthesis in Alaskan Huskies, which we suspected allowed rapid remodeling of mitochondrial proteins in response to energetic stress. The purpose of this study was to examine mitochondrial respiration in permeabilized skeletal muscle fibers of Alaskan Huskies in the offseason (Non-raced) and following the 1600 km Iditarod Sled Dog Race (Raced)...
2017: PloS One
https://www.readbyqxmd.com/read/28429598/preliminary-clinical-validation-of-a-differential-correction-method-for-improving-measurement-accuracy-in-noninvasive-measurement-of-blood-glucose-using-near-infrared-spectroscopy
#16
Guang Han, Xuyao Yu, Dandan Xia, Rong Liu, Jin Liu, Kexin Xu
One of the main challenges in the noninvasive sensing of blood glucose by near-infrared (NIR) spectroscopy is the background variations from light source drift, sweating, and temperature change at the human-machine interface. In this paper, a differential correction method based on the spectra from the floating-reference position and measuring position is proposed to eliminate these spectral variations from background interferences. Its effectiveness was validated by in vitro and in vivo experiments in which the diffuse reflectance of intralipid solutions and human skin was collected at the source distances of 0...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28401931/early-neurovascular-dysfunction-in-a-transgenic-rat-model-of-alzheimer-s-disease
#17
Illsung L Joo, Aaron Y Lai, Paolo Bazzigaluppi, Margaret M Koletar, Adrienne Dorr, Mary E Brown, Lynsie A M Thomason, John G Sled, JoAnne McLaurin, Bojana Stefanovic
Alzheimer's disease (AD), pathologically characterized by amyloid-β peptide (Aβ) accumulation, neurofibrillary tangle formation, and neurodegeneration, is thought to involve early-onset neurovascular abnormalities. Hitherto studies on AD-associated neurovascular injury have used animal models that exhibit only a subset of AD-like pathologies and demonstrated some Aβ-dependent vascular dysfunction and destabilization of neuronal network. The present work focuses on the early stage of disease progression and uses TgF344-AD rats that recapitulate a broader repertoire of AD-like pathologies to investigate the cerebrovascular and neuronal network functioning using in situ two-photon fluorescence microscopy and laminar array recordings of local field potentials, followed by pathological analyses of vascular wall morphology, tau hyperphosphorylation, and amyloid plaques...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28391400/altered-cerebral-blood-flow-and-cerebrovascular-function-after-voluntary-exercise-in-adult-mice
#18
Lindsay S Cahill, Jonathan Bishop, Lisa M Gazdzinski, Adrienne Dorr, Bojana Stefanovic, John G Sled
The beneficial effects of physical exercise on brain health are well documented, yet how exercise modulates cerebrovascular function is not well understood. This study used continuous arterial spin labeling magnetic resonance imaging with a hypercapnic challenge to examine changes in cerebral blood flow and vascular function after voluntary exercise in healthy, adult mice. Thirty exercise mice and twenty-one control mice were imaged prior to the start of the exercise regime (at 12 weeks of age) and after 4 weeks of voluntary exercise...
April 8, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28388752/-acute-kidney-injury-potentials-to%C3%A2-improve-aki-related-health-care-structure
#19
REVIEW
Christian Nusshag, Konrad Obermann, Markus Weigand, Vedat Schwenger
Since 2005 the AKI numbers nearly increased threefold. The prevailing health care structure for AKI-management in Germany possesses major potential for improvement. Despite a clear advantage regarding mortality and renal recovery, the cost-intensive CRRT is the predominant procedure in AKI-therapy. Conversion of 85 % of the CRRT-procedures to a dialysis procedure (IHD/SLED) enables annual savings in AKI-therapy by 7.3 million Euros. A reinvestment can finance a strengthened collaboration with licensed nephrologists to improve therapy quality and availability of RRT-units in local hospitals...
April 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28364018/ultrasound-detection-of-altered-placental-vascular-morphology-based-on-hemodynamic-pulse-wave-reflection
#20
Anum Rahman, Yu-Qing Zhou, Yohan Yee, Jun Dazai, Lindsay S Cahill, John Kingdom, Christopher K Macgowan, John G Sled
Abnormally pulsatile umbilical artery (UA) Doppler ultrasound velocity waveforms are a hallmark of severe or early onset placental-mediated intrauterine growth restriction (IUGR), whereas milder late onset IUGR pregnancies typically have normal UA pulsatility. The diagnostic utility of these waveforms to detect placental pathology is thus limited and hampered by factors outside of the placental circulation, including fetal cardiac output. In view of these limitations, we hypothesized that these Doppler waveforms could be more clearly understood as a reflection phenomenon and that a reflected pulse pressure wave is present in the UA that originates from the placenta and propagates backward along the UA...
May 1, 2017: American Journal of Physiology. Heart and Circulatory Physiology
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