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https://www.readbyqxmd.com/read/28542090/5-km-time-trial-reliability-of-a-non-motorized-treadmill-and-comparison-of-physiological-and-perceptual-responses-versus-a-motorized-treadmill
#1
Hunter S Waldman, Alex J Heatherly, Ashton F Waddell, Ben M Krings, Eric K O'Neal
This study examined the reproducibility of performance across 3 non-motorized treadmill (NMT) 5-km time trials (TT) and physiological, gait, and perceptual differences of running at 5-km pace for both NMT and motorized treadmills (MT). Ten male runners experienced in road racing that had never run on a NMT completed 3 TT to establish personal best 5-km pace. In a later session, participants ran at this pace for 5 min on the NMT while metabolic, gait, and perceptual measures were recorded and then ran at outdoor 5-km personal best pace on a MT at 1% grade (counter-balanced crossover design)...
May 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28531129/rapid-and-cost-effective-quantification-of-glucosinolates-and-total-phenolic-content-in-rocket-leaves-by-visible-near-infrared-spectroscopy
#2
Eva María Toledo-Martín, Rafael Font, Sara Obregón-Cano, Antonio De Haro-Bailón, Myriam Villatoro-Pulido, Mercedes Del Río-Celestino
The potential of visible-near infrared spectroscopy to predict glucosinolates and total phenolic content in rocket (Eruca vesicaria) leaves has been evaluated. Accessions of the E. vesicaria species were scanned by NIRS as ground leaf, and their reference values regressed against different spectral transformations by modified partial least squares (MPLS) regression. The coefficients of determination in the external validation (R²VAL) for the different quality components analyzed in rocket ranged from 0.59 to 0...
May 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28515830/how-different-respiratory-rate-patterns-affect-cardiorespiratory-variables-and-performance
#3
Minas Nalbandian, Zsolt Radak, Jun Taniguchi, Takeda Masaki
This study aims to elucidate how respiratory rate (RR) patterns may affect respiratory gas exchange variables and performance during incremental intensity- exercise. 10 healthy young men (mean ± SD, age: 20.7 ± 0.5 years, height: 174.3 ± 5.7 cm, and body mass: 72.6 ± 10.4 kg) performed three incremental tests on a cycle ergometer at three different RR (60, 45 and 30 breaths per min) in each trial. During the tests, tidal volume (TV), minute ventilation (VE), fractional content of oxygen (FeO2), fractional content of carbon dioxide (FeCO2), oxygen uptake (VO2), expiratory carbon dioxide (VCO2), equivalent of oxygen (EqO2), VE/VCO2, and respiratory exchange ratio (RER) were determinate breath-by-breath...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28453544/predicting-herbivore-faecal-nitrogen-using-a-multispecies-near-infrared-reflectance-spectroscopy-calibration
#4
Miriam Villamuelas, Emmanuel Serrano, Johan Espunyes, Néstor Fernández, Jorge R López-Olvera, Mathieu Garel, João Santos, María Ángeles Parra-Aguado, Maurizio Ramanzin, Xavier Fernández-Aguilar, Andreu Colom-Cadena, Ignasi Marco, Santiago Lavín, Jordi Bartolomé, Elena Albanell
Optimal management of free-ranging herbivores requires the accurate assessment of an animal's nutritional status. For this purpose 'near-infrared reflectance spectroscopy' (NIRS) is very useful, especially when nutritional assessment is done through faecal indicators such as faecal nitrogen (FN). In order to perform an NIRS calibration, the default protocol recommends starting by generating an initial equation based on at least 50-75 samples from the given species. Although this protocol optimises prediction accuracy, it limits the use of NIRS with rare or endangered species where sample sizes are often small...
2017: PloS One
https://www.readbyqxmd.com/read/28401359/ultrastructure-of-fat-body-cells-and-malpighian-tubule-cells-in-overwintering-scoliopteryx-libatrix-noctuoidea
#5
Saška Lipovšek, Franc Janžekovič, Tone Novak
The herald moths, Scoliopteryx libatrix, overwinter in hypogean habitats. The ultrastructure of their fat body (FB) cells and Malpighian tubule (MT) epithelial cells was studied by light microscopy and transmission electron microscopy, and essential biometric and biochemical measurements were performed. The FB was composed of adipocytes and sparse urocytes. The ultrastructure of both cells did not change considerably during this natural starvation period, except for rough endoplasmic reticulum (rER) which became more abundant in March females...
April 11, 2017: Protoplasma
https://www.readbyqxmd.com/read/28377168/a-reference-equation-for-normal-standards-for-vo2-max-analysis-from-the-fitness-registry-and-the-importance-of-exercise-national-database-friend-registry
#6
REVIEW
Jonathan Myers, Leonard A Kaminsky, Ricardo Lima, Jeffrey Chistle, Euan Ashley, Ross Arena
Existing normal standards for maximal oxygen uptake (VO2 max) are problematic because they tend to be population specific, lack normal distribution and portability, and are poorly represented by women. The objective of the current study was to apply the Fitness Registry and the Importance of Exercise: A National Data Base (FRIEND) Registry to improve upon previous regression formulas for normal standards for VO2 max using treadmill testing. Maximal treadmill tests were performed in 7783 healthy men and women (20-79years; maximal RER >1...
April 1, 2017: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/28368959/the-effects-of-a-cycling-warm-up-including-high-intensity-heavy-resistance-conditioning-contractions-on-subsequent-4-km-time-trial-performance
#7
Alan Chorley, Kevin L Lamb
Prior exercise has been shown to improve subsequent performance via different mechanisms. Sport-specific conditioning contractions can be used to exploit the 'post-activation potentiation' (PAP) phenomenon to enhance performance although this has rarely been investigated in short endurance events. The aim of this study was to compare a cycling warm-up with PAP-inducing conditioning contractions (CW) with a moderate intensity warm-up (MW) on performance and physiological outcomes of 4 km time trial. Ten well-trained male endurance cyclists (V[Combining Dot Above]O2max 65...
March 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28346316/impact-of-direction-of-unloading-influence-on-template-rate-of-perceived-exertion
#8
Beau Kjerulf Greer, Patrick R Young, Brooke Thompson, Brendan J Rickert, Matthew F Moran
It is suggested that exercisers engage in a process of teleoanticipation and create an exercise template based upon previous experience with the exercise task which guides their perceptions of the amount of effort required for task completion. The present study examined how altering workload intensity during a positive-pressure treadmill task may impact ratings of perceived exertion (RPE). In a counter-balanced design, 15 collegiate cross country runners (7 males, 8 females) performed two 25-min runs at a constant velocity while bodyweight (BW) was either increased from 60% to 100% (INC) or decreased from 100% to 60% (DEC) in 5 min increments...
March 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28286541/an-evaluation-of-inexpensive-methods-for-root-image-acquisition-when-using-rhizotrons
#9
Awaz Mohamed, Yogan Monnier, Zhun Mao, Guillaume Lobet, Jean-Luc Maeght, Merlin Ramel, Alexia Stokes
BACKGROUND: Belowground processes play an essential role in ecosystem nutrient cycling and the global carbon budget cycle. Quantifying fine root growth is crucial to the understanding of ecosystem structure and function and in predicting how ecosystems respond to climate variability. A better understanding of root system growth is necessary, but choosing the best method of observation is complex, especially in the natural soil environment. Here, we compare five methods of root image acquisition using inexpensive technology that is currently available on the market: flatbed scanner, handheld scanner, manual tracing, a smartphone application scanner and a time-lapse camera...
2017: Plant Methods
https://www.readbyqxmd.com/read/28246499/energy-systems-efficiency-influences-the-results-of-2-000-m-race-simulation-among-elite-rowers
#10
Stefan Adrian Martin, Valeriu Tomescu
HYPOTHESIS: Energy efficiency within an elite group of athletes will ensure metabolic adaptation during training. OBJECTIVES: To identify energy system efficiency and contribution according to exercise intensity, and performance obtained during a 2,000 m race simulation in an elite group of rowers. METHOD: An observational cross-sectional study was conducted in February 2016 in Bucharest, Romania, on a group of 16 elite rowers. Measurements were performed through Cosmed Quark CPET equipment, and Concept 2 ergometer, by conducting a VO2max test over a standard rowing distance of 2,000 m...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/28124871/positive-surgical-margins-and-local-recurrence-after-simple-enucleation-and-standard-partial-nephrectomy-for-malignant-renal-tumors-systematic-review-of-the-literature-and-meta-analysis-of-prevalence
#11
Andrea Minervini, Riccardo Campi, Francesco Sessa, Ithaar Derweesh, Jihad H Kaouk, Andrea Mari, Koon H Rha, Maurizio Sessa, Alessandro Volpe, Marco Carini, Robert G Uzzo
BACKGROUND: The definition of the safest width of healthy renal margin to achieve oncological efficacy and therefore of the safest resection technique (RT) during partial nephrectomy (PN) continues to be widely debated. The aim of this study is to evaluate the prevalence of positive surgical margins (PSM), loco-regional recurrence (LRR) and renal recurrence (RER) rates after simple enucleation (SE) and standard partial nephrectomy (SPN) for malignant renal tumors in studies with a minimum follow-up of 2 years...
January 26, 2017: Minerva Urologica e Nefrologica, the Italian Journal of Urology and Nephrology
https://www.readbyqxmd.com/read/28090793/development-and-validation-of-a-predictor-of-insufficient-enhancement-during-the-hepatobiliary-phase-of-gd-eob-dtpa-enhanced-magnetic-resonance-imaging
#12
Enming Cui, Wansheng Long, Liangping Luo, Maoqing Hu, Liebin Huang, Xiangmeng Chen
Background Insufficient enhancement of liver parenchyma negatively affects diagnostic accuracy of Gd-EOB-DTPA-enhanced magnetic resonance imaging (MRI). Currently, there is no reliable method for predicting insufficient enhancement during the hepatobiliary phase (HBP) in Gd-EOB-DTPA-enhanced MRI. Purpose To develop a predictor for insufficient enhancement of liver parenchyma during HBP in Gd-EOB-DTPA-enhanced MRI. Material and Methods In order to formulate a HBP enhancement test (HBP-ET), clinical factors associated with relative enhancement ratio (RER) of liver parenchyma were retrospectively determined from the datasets of 156 patients (Development group) who underwent Gd-EOB-DTPA-enhanced MRI between November 2012 and May 2015...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28090142/the-midpoint-between-ventilatory-thresholds-approaches-maximal-lactate-steady-state-intensity-in-amateur-cyclists
#13
A B Peinado, Dm Pessôa Filho, V Díaz, P J Benito, M Álvarez-Sánchez, A G Zapico, F J Calderón
The aim was to determine whether the midpoint between ventilatory thresholds (MPVT) corresponds to maximal lactate steady state (MLSS). Twelve amateur cyclists (21.0 ± 2.6 years old; 72.2 ± 9.0 kg; 179.8 ± 7.5 cm) performed an incremental test (25 W·min(-1)) until exhaustion and several constant load tests of 30 minutes to determine MLSS, on different occasions. Using MLSS determination as the reference method, the agreement with five other parameters (MPVT; first and second ventilatory thresholds: VT1 and VT2; respiratory exchange ratio equal to 1: RER = 1...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/27928213/proposal-for-a-specific-aerobic-test-for-football-players-the-footeval
#14
Christophe Manouvrier, Johan Cassirame, Saïd Ahmaidi
The aim of this study was to evaluate the reproducibility and validity of the "Footeval" test, which evaluates football players' aerobic level in conditions close to those of football practice (intermittent, including technical skills). Twenty-four highly trained subjects from an elite football academy (17.8 ± 1.4 years, 5 training sessions per week) performed two Footeval sessions in a period of 7 days. Physiological variables measured during these sessions (VO2max 58.1 ± 5.6 and 58.7 ± 6.2 ml·min(-1)·kg(-1); RER 1...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27824689/eccentric-cycling-a-promising-modality-for-patients-with-chronic-heart-failure
#15
Lauren C Chasland, Daniel J Green, Andrew J Maiorana, Kazunori Nosaka, Andrew Haynes, Lawrence G Dembo, Louise H Naylor
PURPOSE: Chronic heart failure (CHF) is characterized by dyspnea and poor exercise tolerance, which decreases aerobic capacity (V˙O2peak), a measure strongly correlated with quality of life and mortality. In healthy populations, eccentric (ECC) cycling can be performed at a lower oxygen demand for matched workload, compared with concentric (CON) cycling, but few studies have previously investigated ECC cycling in CHF. We hypothesized that, when matched for external workload (W), an ECC cycling bout would be performed at a lower cardiorespiratory load (V˙O2) than CON in patients with CHF...
April 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27766133/the-effect-of-a-moderately-low-and-high-carbohydrate-intake-on-crossfit-performance
#16
Kurt A Escobar, Jacobo Morales, Trisha A Vandusseldorp
CrossFit is a metabolically demanding strength and conditioning method which performance may benefit from a carbohydrate (CHO)-rich diet. This study investigated the effect of three consecutive days of high CHO intake on CrossFit performance and corresponding metabolically -related variables in strength trained individuals. Eighteen subjects with a CHO intake of <6 g/kg/day were randomly assigned into a CHO (n = 9) or control (C) group (n =9) and underwent a 9-day training protocol. During days 1, 5, and 9, performance was measured as repetitions completed during a 12 minute CrossFit workout...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27763583/altered-gas-exchange-at-peak-exercise-in-obese-adolescents-implications-for-verification-of-effort-during-cardiopulmonary-exercise-testing
#17
Nastasia Marinus, Liene Bervoets, Guy Massa, Kenneth Verboven, An Stevens, Tim Takken, Dominique Hansen
BACKGROUND: Cardiopulmonary exercise testing is advised ahead of exercise intervention in obese adolescents to assess medical safety of exercise and physical fitness. Optimal validity and reliability of test results are required to identify maximal exercise effort. As fat oxidation during exercise is disturbed in obese individuals, it remains an unresolved methodological issue whether the respiratory gas exchange ratio (RER) is a valid marker for maximal effort during exercise testing in this population...
October 20, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27614882/markers-of-biological-stress-in-response-to-a-single-session-of-high-intensity-interval-training-and-high-volume-training-in-young-athletes
#18
Yvonne Kilian, Florian Engel, Patrick Wahl, Silvia Achtzehn, Billy Sperlich, Joachim Mester
PURPOSE: The aim of the present study was to compare the effects of high-intensity interval training (HIIT) vs high-volume training (HVT) on salivary stress markers [cortisol (sC), testosterone (sT), alpha-amylase (sAA)], metabolic and cardiorespiratory response in young athletes. METHODS: Twelve young male cyclists (14 ± 1 years; 57.9 ± 9.4 mL min(-1) kg(-1) peak oxygen uptake) performed one session of HIIT (4 × 4 min intervals at 90-95 % peak power output separated by 3 min of active rest) and one session of HVT (90 min constant load at 60 % peak power output)...
December 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27514312/variation-in-hospital-utilization-at-the-end-of-life-for-patients-with-cancer-in-the-emilia-romagna-region-of-italy
#19
Daniel Z Louis, Sarah E Hegarty, Maurizio Leoni, Rossana De Palma, Stefan Varga, Rita Melotti
INTRODUCTION: Despite the preference of many patients to die at home, high proportions of patients with advanced cancer undergo major procedures, receive intensive care, and die in the hospital. The goal of this study is to examine variation in hospital utilization and site of death for patients dying with poor-prognosis cancer in the Regione Emilia-Romagna (RER), Italy. METHODS: We conducted a retrospective, population-level study using administrative data. Patients were included if they died in 2012 and had at least one hospital admission for metastatic or poor-prognosis cancer within 180 days of death...
December 1, 2016: Tumori
https://www.readbyqxmd.com/read/27487418/oxygen-uptake-respiratory-exchange-ratio-or-total-distance-a-comparison-of-methods-to-equalize-exercise-volume-in-wistar-rats
#20
L S Paes, J P Borges, F A Cunha, M G C Souza, F Z G A Cyrino, D A Bottino, E Bouskela, P Farinatti
This study compared strategies to equalize the volume of aerobic exercise performed with different intensities by Wistar rats, based on the distance covered during exercise bouts and energy expenditure (EE, isocaloric sessions) obtained from oxygen uptake (V̇O2) or respiratory exchange ratio (RER). Thirty-three male rats (270.5±12.8 g) underwent maximal exercise tests to determine V̇O2 reserve (V̇O2R), being randomly assigned to three groups: moderate-intensity continuous exercise at speed corresponding to 50% V̇O2R (MIC; n=11); high-intensity continuous exercise at 80% V̇O2R (HIC; n=11); and high-intensity intermittent exercise (HII; n=11) at 60% V̇O2R (3 min) and 80% V̇O2R (4 min)...
July 28, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
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