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https://www.readbyqxmd.com/read/28230417/aging-and-half-ironman-performance
#1
M J Stones, Adric Hartin
: Background/Study Context: Previous research on triathlon performance analyzed age trends for the Top Ten or Top Five finishers in world championship or national races at Olympic, Half-Ironman, and Ironman distances. The findings indicated higher age declines and/or earlier onset of decline in swimming and running than cycling. However, the designs of those studies took no account of possible differences between cross-sectional and longitudinal trends (i.e., cohort differences versus age changes)...
March 2017: Experimental Aging Research
https://www.readbyqxmd.com/read/28229568/yo-yo-ir1-vs-incremental-continuous-running-test-for-prediction-of-3000-m-performance
#2
Boris Schmitz, Andreas Klose, Katrin Schelleckes, Charlotte M Jekat, Michael Krüger, Stefan-Martin Brand
BACKGROUND: This study aimed to compare physiological responses during the Yo-Yo intermittent recovery level 1 (Yo-Yo IR1) test and an incremental continuous running field test (ICRT) and to analyze their predictive value on 3000 m running performance. METHODS: Forty moderately trained individuals (18 females) performed the ICRT and Yo-Yo IR1 test to exhaustion. The ICRT was performed as graded running test with an increase of 2.0 km·h-1 after each 3 min interval for lactate diagnostic...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28223186/reduction-of-across-run-variability-of-temporal-snr-in-accelerated-epi-time-series-data-through-fleet-based-robust-autocalibration
#3
Anna I Blazejewska, Himanshu Bhat, Lawrence L Wald, Jonathan R Polimeni
Temporal signal-to-noise ratio (tSNR) is a key metric for assessing the ability to detect brain activation in fMRI data. A recent study has shown substantial variation of tSNR between multiple runs of accelerated EPI acquisitions reconstructed with the GRAPPA method using protocols commonly used for fMRI experiments. Across-run changes in the location of high-tSNR regions could lead to misinterpretation of the observed brain activation patterns, reduced sensitivity of the fMRI studies, and biased results. We compared conventional EPI autocalibration (ACS) methods with the recently-introduced FLEET ACS method, measuring their tSNR variability, as well as spatial overlap and displacement of high-tSNR clusters across runs in datasets acquired from human subjects at 7T and 3T...
February 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28222581/a-comparison-of-the-physiological-demands-imposed-by-competing-in-a-half-marathon-vs-a-marathon
#4
Juan Del Coso, Juan J Salinero, Beatriz Lara, Javier Abián-Vicén, César Gallo-Salazar, Francisco Areces
BACKGROUND: While there is widespread scientific information about the physiological challenges imposed on elite endurance runners during competitions, the information regarding the amateur population is scarce. The aim of this study was to compare the physical and physiological load imposed by competing in a real half-marathon vs a marathon race. METHODS: From a larger group of participants, we selected 22 experienced runners who were matched in pairs (11 marathoners and 11 half-marathoners) for age and anthropometric data...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28222048/comparison-of-running-economy-values-while-wearing-no-shoes-minimal-shoes-and-normal-running-shoes
#5
Robbie G Cochrum, Ryan T Connors, John M Coons, Dana K Fuller, Don W Morgan, Jennifer L Caputo
Cochrum, RG, Connors, RT, Coons, JM, Fuller, DK, Morgan, DW, and Caputo, JL. Comparison of running economy values while wearing no shoes, minimal shoes, and normal running shoes. J Strength Cond Res 31(3): 595-601, 2017-The purpose of this study was to quantify differences in running economy (RE) at 50 and 70% of each subject's velocity at V[Combining Dot Above]O2max (vV[Combining Dot Above]O2max) across barefoot and 2 mass, stack height, and heel-to-toe-drop controlled footwear conditions (minimal shoes and normal running shoes) in 9 recreational distance runners (mean age 26...
March 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28221904/reduction-of-bacterial-pathogens-and-potential-surrogates-on-the-surface-of-almonds-using-high-intensity-405-nanometer-light
#6
Alison Lacombe, Brendan A Niemira, Joseph Sites, Glenn Boyd, Joshua B Gurtler, Breanna Tyrell, Melissa Fleck
The disinfecting properties of high-intensity monochromatic blue light (MBL) were investigated against Escherichia coli O157:H7, Salmonella , and nonpathogenic bacteria inoculated onto the surface of almonds. MBL was generated from an array of narrow-band 405-nm light-emitting diodes. Almonds were inoculated with higher or lower levels (8 or 5 CFU/g) of pathogenic E. coli O157:H7 and Salmonella , as well as nonpathogenic E. coli K-12 and an avirulent strain of Salmonella Typhimurium, for evaluation as potential surrogates for their respective pathogens...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28217337/crystal-structures-of-three-1-oxo-1-2-di-hydro-naphthalene-derivatives-dimethyl-4-4-meth-oxy-phen-yl-2-4-methyl-phen-yl-1-oxo-1-2-di-hydro-naphthalene-2-3-di-carboxyl-ate-dimethyl-1-oxo-2-pyren-4-yl-4-thio-phen-2-yl-1-2-di-hydro-naphthalene-2-3-di-carboxyl
#7
S Gopinath, P Narayanan, K Sethusankar, Jeyachandran Karunakaran, Meganathan Nandakumar, Arasambattu K Mohanakrishnan
In the title 1-oxo-1,2-di-hydro-naphthalene derivatives, C28H24O6, (I), C34H22O5S, (II), and C27H20O3S2, (III), the cyclo-hexa-1,3-diene rings of the 1,2-di-hydro-naphthalene ring systems adopt half-chair, boat and half-chair conformations, respectively. The carbonyl O atoms attached to the di-hydro-naphthalene ring systems are each significantly deviated from the mean plane of the 1,2-di-hydro-naphthalene ring system, by 0.6162 (12) Å in (I), 0.6016 (16) Å in (II) and 0.515 (3) Å in (III). The mean planes of the 1,2-di-hydro-naphthalene ring systems make dihedral angles of 85...
February 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28215003/improved-electromagnetic-tracking-for-catheter-path-reconstruction-with-application-in-high-dose-rate-brachytherapy
#8
Elodie Lugez, Hossein Sadjadi, Chandra P Joshi, Selim G Akl, Gabor Fichtinger
PURPOSE: Electromagnetic (EM) catheter tracking has recently been introduced in order to enable prompt and uncomplicated reconstruction of catheter paths in various clinical interventions. However, EM tracking is prone to measurement errors which can compromise the outcome of the procedure. Minimizing catheter tracking errors is therefore paramount to improve the path reconstruction accuracy. METHODS: An extended Kalman filter (EKF) was employed to combine the nonlinear kinematic model of an EM sensor inside the catheter, with both its position and orientation measurements...
February 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28210643/perception-of-health-problems-among-competitive-runners-a-qualitative-study-of-cognitive-appraisals-and-behavioral-responses
#9
Sara Jelvegård, Toomas Timpka, Victor Bargoria, Håkan Gauffin, Jenny Jacobsson
BACKGROUND: Approximately 2 of every 3 competitive runners sustain at least 1 health problem each season. Most of these problems are nontraumatic injuries with gradual onset. The main known risk indicator for sustaining a new running-related injury episode is a history of a previous injury, suggesting that behavioral habits are part of the causal mechanisms. PURPOSE: Identification of elements associated with purposeful interpretations of body perceptions and balanced behavioral responses may supply vital information for prevention of health problems in runners...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28207880/skeletal-muscle-metabolic-adaptations-to-endurance-exercise-training-are-attainable-in-mice-with-simvastatin-treatment
#10
William M Southern, Anna S Nichenko, Daniel D Shill, Corey C Spencer, Nathan T Jenkins, Kevin K McCully, Jarrod A Call
We tested the hypothesis that a 6-week regimen of simvastatin would attenuate skeletal muscle adaptation to low-intensity exercise. Male C57BL/6J wildtype mice were subjected to 6-weeks of voluntary wheel running or normal cage activities with or without simvastatin treatment (20 mg/kg/d, n = 7-8 per group). Adaptations in in vivo fatigue resistance were determined by a treadmill running test, and by ankle plantarflexor contractile assessment. The tibialis anterior, gastrocnemius, and plantaris muscles were evaluated for exercised-induced mitochondrial adaptations (i...
2017: PloS One
https://www.readbyqxmd.com/read/28195970/reduction-of-physiological-strain-under-a-hot-and-humid-environment-by-a-hybrid-cooling-vest
#11
Albert P C Chan, Y Yang, Francis K W Wong, Michael C H Yam, Del P Wong, W F Song
Cooling treatment is regarded as one of good practices to provide safe training conditions to athletic trainers in the hot environment. The present study aimed to investigate whether wearing a commercial lightweight and portable hybrid cooling vest that combines air ventilation fans with frozen gel packs was an effective means to reduce participants' body heat strain. In this within-subject repeated measures study, 10 male volunteers participated in two heat-stress trials (one with the cooling vest - COOL condition, and another without - CON condition, in a randomized order) inside a climatic chamber with a controlled ambient temperature 33 °C and relative humidity (RH) 75% on an experimental day...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195301/people-choose-to-run-at-their-optimal-speed
#12
Joseph K Rathkey, Cara M Wall-Scheffler
OBJECTIVES: The purpose of this article is to test whether people choose to behave in a manner that reduces the amount of energy they use to travel a given distance. While this has been shown consistently for walking, it has never been tested with human running. MATERIALS AND METHODS: We collected energetic data and lower limb anthropometrics on nine men running at six different running speeds. We collected on all six speeds on 3 different days and took the average of the energetic values for each speed...
February 14, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28185574/anchoring-quartet-based-phylogenetic-distances-and-applications-to-species-tree-reconstruction
#13
Erfan Sayyari, Siavash Mirarab
BACKGROUND: Inferring species trees from gene trees using the coalescent-based summary methods has been the subject of much attention, yet new scalable and accurate methods are needed. RESULTS: We introduce DISTIQUE, a new statistically consistent summary method for inferring species trees from gene trees under the coalescent model. We generalize our results to arbitrary phylogenetic inference problems; we show that two arbitrarily chosen leaves, called anchors, can be used to estimate relative distances between all other pairs of leaves by inferring relevant quartet trees...
November 11, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28182531/relationships-of-functional-tests-following-acl-reconstruction-exploratory-factor-analyses-of-the-lower-extremity-assessment-protocol
#14
Melissa DiFabio, Lindsay V Slater, Grant Norte, John Goetschius, Joseph M Hart, Jay Hertel
CONTEXT: After ACL reconstruction (ACLR), deficits are often assessed using a variety of functional tests, which can be time consuming. It is unknown whether these tests provide redundant or unique information. OBJECTIVE: To explore relationships between components of a battery of functional tests, the Lower Extremity Assessment Protocol (LEAP), to aid in developing the most informative, concise battery of tests for evaluating ACLR patients. DESIGN: Descriptive, cross-sectional...
February 9, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28182509/knowledge-of-task-end-point-influences-pacing-and-performance-during-simulated-rugby-league-match-play
#15
Jamie Highton, Thomas Mullen, Craig Twist
PURPOSE: To examine the influence of knowledge of exercise duration on pacing and performance during simulated rugby league match-play. METHODS: Thirteen male university rugby players completed three simulated rugby league matches (RLMSP-i) on separate days in a random order. In a control trial, participants were informed that they would be performing 2 x 23 min bouts (separated by 20 min) of the RLMSP-i (CON). In a second trial, participants were informed that they would be performing 1 x 23 min bout of the protocol, but were then asked to perform another 23 min bout (DEC)...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182505/factors-affecting-match-running-performance-in-professional-australian-football
#16
Samuel Ryan, Aaron J Coutts, Joel Hocking, Thomas Kempton
PURPOSE: To examine the influence of a range of individual player characteristics and match-related factors on activity profiles during professional Australian football matches. METHODS: Global positioning system (GPS) profiles were collected from 34 professional Australian football players from the same club over 15 competition matches. GPS data were classified into relative total and high-speed running (HSR; >20 km·h(-1)) distances. Individual player aerobic fitness was determined from a two-kilometre time trial conducted during the pre-season...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28177715/gut-training-the-impact-of-two-weeks-repetitive-gut-challenge-during-exercise-on-gastrointestinal-status-glucose-availability-fuel-kinetics-and-running-performance
#17
Ricardo J S Costa, Atlanta Miall, Anthony Khoo, Christopher Rauch, Rhiannon Snipe, Vera Camões-Costa, Peter Gibson
BACKGROUND: Due to gastrointestinal tract adaptability, the study aimed to determine the impact of two weeks gut-training protocol over two weeks on gastrointestinal status, blood glucose availability, fuel kinetics, and running performance. METHODS: Endurance runners (n= 25) performed a gut-challenge trial (GC1), comprising of 2 h running exercise at 60% VO2max whilst consuming gel-discs containing 30 g carbohydrates (2:1 glucose-fructose, 10% w/v) every 20 min, and a 1 h distance test...
January 19, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28174540/the-influence-of-mid-event-deception-on-psychophysiological-status-and-pacing-can-persist-across-consecutive-disciplines-and-enhance-self-paced-multi-modal-endurance-performance
#18
Daniel Taylor, Mark F Smith
Purpose: To examine the effects of deceptively aggressive bike pacing on performance, pacing, and associated physiological and perceptual responses during simulated sprint-distance triathlon. Methods: Ten non-elite, competitive male triathletes completed three simulated sprint-distance triathlons (0.75 km swim, 500 kJ bike, 5 km run), the first of which established personal best "baseline" performance (BL). During the remaining two trials athletes maintained a cycling power output 5% greater than BL, before completing the run as quickly as possible...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28170440/quantitative-study-on-the-fate-of-residual-soil-nitrate-in-winter-wheat-based-on-a-15n-labeling-method
#19
Jing-Ting Zhang, Zhi-Min Wang, Shuang-Bo Liang, Ying-Hua Zhang, Shun-Li Zhou, Lai-Qing Lu, Run-Zheng Wang
A considerable amount of surplus nitrogen (N), which primarily takes the form of nitrate, accumulates in the soil profile after harvesting crops from an intensive production system in the North China Plain. The residual soil nitrate (RSN) is a key factor that is included in the N recommendation algorithm. Quantifying the utilization and losses of RSN is a fundamental necessity for optimizing crop N management, improving N use efficiency, and reducing the impact derived from farmland N losses on the environment...
2017: PloS One
https://www.readbyqxmd.com/read/28167917/forced-running-endurance-is-influenced-by-gene-s-on-mouse-chromosome-10
#20
Mindaugas Kvedaras, Petras Minderis, Andrej Fokin, Aivaras Ratkevicius, Tomas Venckunas, Arimantas Lionikas
Phenotypic diversity between laboratory mouse strains provides a model for studying the underlying genetic mechanisms. The A/J strain performs poorly in various endurance exercise models. The aim of the study was to test if endurance capacity and contractility of the fast- and slow-twitch muscles are affected by the genes on mouse chromosome 10. The C57BL/6J (B6) strain and C57BL/6J-Chr 10(A/J)/NaJ (B6.A10) consomic strain which carries the A/J chromosome 10 on a B6 strain background were compared. The B6.A10 mice compared to B6 were larger in body weight (p < 0...
2017: Frontiers in Physiology
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