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"Critical power"

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https://www.readbyqxmd.com/read/29161112/reply-to-discussion-of-can-measures-of-critical-power-precisely-estimate-the-maximal-metabolic-steady-state-is-it-still-necessary-to-compare-critical-power-to-maximal-lactate-steady-state-when-is-it-appropriate-to-compare-critical-power-to-maximal-lactate-steady
#1
Daniel A Keir, Felipe Mattioni Maturana, Juan M Murias
No abstract text is available yet for this article.
November 21, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29161111/discussion-of-can-measures-of-critical-power-precisely-estimate-the-maximal-metabolic-steady-state-is-it-still-necessary-to-compare-critical-power-to-maximal-lactate-steady-state
#2
Ricardo Dantas de Lucas
No abstract text is available yet for this article.
November 21, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29135786/are-rcp-and-critical-power-equivalent-the-issue-of-mean-response-time
#3
Jan Boone, Jan G Bourgois
No abstract text is available yet for this article.
December 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29124324/the-effect-of-mental-fatigue-on-critical-power-during-cycling-exercise
#4
Hawbeer Salam, Samuele M Marcora, James G Hopker
PURPOSE: Time to exhaustion (TTE) tests used in the determination of critical power (CP) and curvature constant (W') of the power-duration relationship are strongly influenced by the perception of effort (PE). This study aimed to investigate whether manipulation of the PE alters the CP and W'. METHODS: Eleven trained cyclists completed a series of TTE tests to establish CP and W' under two conditions, following a mentally fatiguing (MF), or a control (CON) task...
November 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29108901/keto-adaptation-enhances-exercise-performance-and-body-composition-responses-to-training-in-endurance-athletes
#5
Fionn T McSwiney, Bruce Wardrop, Parker N Hyde, Richard A Lafountain, Jeff S Volek, Lorna Doyle
BACKGROUND: Low-carbohydrate diets have recently grown in popularity among endurance athletes, yet little is known about the long-term (>4 wk) performance implications of consuming a low-carbohydrate high fat ketogenic diet (LCKD) in well-trained athletes. METHODS: Twenty male endurance-trained athletes (age 33 ± 11y, body mass 80 ± 11kg; BMI 24.7 ± 3.1 kg/m(2)) who habitually consumed a carbohydrate-based diet, self-selected into a high-carbohydrate (HC) group (n = 11, %carbohydrate:protein:fat = 65:14:20), or a LCKD group (n = 9, 6:17:77)...
November 3, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29041432/self-focusing-effect-of-annular-beams-propagating-in-the-atmosphere
#6
Yuqiu Zhang, Xiaoling Ji, Xiaoqing Li, Qiang Li, Hong Yu
The self-focusing effect of annular beams propagating in the atmosphere to assist delivering powerful laser beams from orbit to the ground is studied in detail. It is found the annular beam is compressed more strongly due to the self-focusing effect as the beam obscure ratio increases. On the other hand, the self-focusing effect between annular, flat-topped and Gaussian beams is compared. It is shown that the self-focusing effect on the annular beam is stronger than that on flat-topped and Gaussian beams. However, the threshold critical power values of annular, flat-topped and Gaussian beams should be in sequence from small to large...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29035607/accuracy-of-w-recovery-kinetics-in-high-performance-cyclists-modelling-intermittent-work-capacity
#7
Jason C Bartram, Dominic Thewlis, David T Martin, Kevin I Norton
PURPOSE: With knowledge of an individual's critical power (CP) and W' the SKIBA 2 model provides a framework with which to track W' balance during intermittent high intensity work bouts. There are fears the time constant controlling the recovery rate of W' (τW') may require refinement to enable effective use in an elite population. METHODS: Four elite endurance cyclists completed an array of intermittent exercise protocols to volitional exhaustion. Each protocol lasted approximately 3...
October 16, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28986554/transition-of-femtosecond-filament-solid-interactions-from-single-to-multiple-filament-regime
#8
P J Skrodzki, M Burger, I Jovanovic
High-peak-power fs-laser filaments offer unique characteristics attractive to remote sensing via techniques such as remote laser-induced breakdown spectroscopy (R-LIBS). The dynamics of several ablation mechanisms following the interaction between a filament and a solid determines the emission strength and reproducibility of target plasma, which is of relevance for R-LIBS applications. We investigate the space- and time-resolved dynamics of ionic and atomic emission from copper as well as the surrounding atmosphere in order to understand limitations of fs-filament-ablation for standoff energy delivery...
October 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28919166/kinetic-analysis-of-oxygen-dynamics-under-a-variable-work-rate
#9
Alexander Artiga Gonzalez, Raphael Bertschinger, Fabian Brosda, Thorsten Dahmen, Patrick Thumm, Dietmar Saupe
Measurements of oxygen uptake are central to methods for the assessment of physical fitness and endurance capabilities in athletes. Two important parameters extracted from such data of incremental exercise tests are the maximal oxygen uptake and the critical power. A commonly accepted model of the dynamics of oxygen uptake during exercise at a constant work rate comprises a constant baseline oxygen uptake, an exponential fast component, and another exponential slow component for heavy and severe work rates...
September 14, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28892462/cycling-performance-is-superior-for-time-to-exhaustion-versus-time-trial-in-endurance-laboratory-tests
#10
Sarah L Coakley, Louis Passfield
Time-to-exhaustion (TTE) trials are used in a laboratory setting to measure endurance performance. However, there is some concern with their ecological validity compared with time-trials (TT). Consequently, we aimed to compare cycling performance in TTE and TT where the duration of the trials was matched. Seventeen trained male cyclists completed three TTE trials at 80, 100 and 105% of maximal aerobic power (MAP). On a subsequent visit they performed three TT over the same duration as the TTE. Participants were blinded to elapsed time, power output, cadence and heart rate (HR)...
September 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28866575/treepod-sensitivity-aware-selection-of-pareto-optimal-decision-trees
#11
Thomas Muhlbacher, Lorenz Linhardt, Torsten Moller, Harald Piringer
Balancing accuracy gains with other objectives such as interpretability is a key challenge when building decision trees. However, this process is difficult to automate because it involves know-how about the domain as well as the purpose of the model. This paper presents TreePOD, a new approach for sensitivity-aware model selection along trade-offs. TreePOD is based on exploring a large set of candidate trees generated by sampling the parameters of tree construction algorithms. Based on this set, visualizations of quantitative and qualitative tree aspects provide a comprehensive overview of possible tree characteristics...
August 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28860660/free-space-nonlinear-beam-combining-for-high-intensity-projection
#12
Shermineh Rostami Fairchild, Wiktor Walasik, Daniel Kepler, Matthieu Baudelet, Natalia M Litchinitser, Martin Richardson
The controlled interaction of two high intensity beams opens new degrees of freedom for manipulating electromagnetic waves in air. The growing number of applications for laser filaments requires fine control of their formation and propagation. We demonstrate, experimentally and theoretically, that the attraction and fusion of two parallel ultrashort beams with initial powers below the critical value (70% P critical), in the regime where the non-linear optical characteristics of the medium become dominant, enable the eventual formation of a filament downstream...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28832393/caffeine-increases-work-done-above-critical-power-but-not-anaerobic-work
#13
Rodrigo Silveira, Victor Amorim Andrade-Souza, Lucyana Arcoverde, Fabiano Tomazini, André Sansonio, David John Bishop, Romulo Bertuzzi, Adriano Eduardo Lima-Silva
PURPOSE: The assumption that the curvature constant (W´) of the power-duration relationship represents anaerobic work capacity is a controversial, unresolved question. We investigated if caffeine ingestion could increase total work done above critical power (CP), and if this would be accompanied by greater anaerobic energy expenditure and by an enhanced maintenance of maximal oxidative metabolic rate. METHODS: Nine men (26.6 ± 5.3 years, V˙O2max 40.6 ± 5.8 mL·kg·min) cycled until exhaustion at different exercise intensities on different days to determine the CP and W´...
August 21, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28795742/optical-reconfiguration-and-polarization-control-in-semi-continuous-gold-films-close-to-the-percolation-threshold
#14
Christian Frydendahl, Taavi Repän, Mathias Geisler, Sergey M Novikov, Jonas Beermann, Andrei V Lavrinenko, Sanshui Xiao, Sergey I Bozhevolnyi, N Asger Mortensen, Nicolas Stenger
Controlling and confining light by exciting plasmons in resonant metallic nanostructures is an essential aspect of many new emerging optical technologies. Here we explore the possibility of controllably reconfiguring the intrinsic optical properties of semi-continuous gold films, by inducing permanent morphological changes with a femtosecond (fs)-pulsed laser above a critical power. Optical transmission spectroscopy measurements show a correlation between the spectra of the morphologically modified films and the wavelength, polarization, and the intensity of the laser used for alteration...
August 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28742832/the-relationship-between-movement-speed-and-duration-during-soccer-matches
#15
Kai Roecker, Hubert Mahler, Christian Heyde, Mareike Röll, Albert Gollhofer
The relationship between the time duration of movement (t(dur)) and related maximum possible power output has been studied and modeled under many conditions. Inspired by the so-called power profiles known for discontinuous endurance sports like cycling, and the critical power concept of Monod and Scherrer, the aim of this study was to evaluate the numerical characteristics of the function between maximum horizontal movement velocity (HSpeed) and t(dur) in soccer. To evaluate this relationship, GPS data from 38 healthy soccer players and 82 game participations (≥30 min active playtime) were used to select maximum HSpeed for 21 distinct t(dur) values (between 0...
2017: PloS One
https://www.readbyqxmd.com/read/28704307/acute-cardiopulmonary-metabolic-and-neuromuscular-responses-to-severe-intensity-intermittent-exercises
#16
Felipe D Lisbôa, João A G Raimundo, Amadeo F Salvador, Kayo L Pereira, Tiago Turnes, Fernando Diefenthaeler, Mariana F M de Oliveira, Fabrizio Caputo
The purpose of this study was to compare cardiopulmonary, neuromuscular, and metabolic responses to severe-intensity intermittent exercises with variable or constant work rate. Eleven cyclists (28 ± 5 years; 74 ± 7 kg; 175 ± 5 cm; 63 ± 4 mL·kg·min) performed the following tests until exhaustion on separate days: 1) an incremental test; 2) in random order, two constant work rate tests at 95% and 110% of the peak power for the determination of Critical Power (CP); 3) 2-4 tests for the determination of the highest power that still permits the achievement of maximal oxygen uptake (PHIGH); and 4) two random severe-intensity intermittent exercises...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28687955/effects-of-recovery-interval-duration-on-the-parameters-of-the-critical-power-model-for-incremental-exercise
#17
Giovanni Vinetti, Nazzareno Fagoni, Anna Taboni, Stefano Camelio, Pietro Enrico di Prampero, Guido Ferretti
INTRODUCTION: We tested the linear critical power ([Formula: see text]) model for discrete incremental ramp exercise implying recovery intervals at the end of each step. METHODS: Seven subjects performed incremental (power increment 25 W) stepwise ramps to subject's exhaustion, with recovery intervals at the end of each step. Ramps' slopes (S) were 0.83, 0.42, 0.28, 0.21, and 0.08 W s(-1); recovery durations (t r) were 0 (continuous stepwise ramps), 60, and 180 s (discontinuous stepwise ramps)...
July 7, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28686083/ischemic-preconditioning-enhances-critical-power-during-a-3-minute-all-out-cycling-test
#18
Patrick J Griffin, Richard A Ferguson, Conor Gissane, Stephen J Bailey, Stephen D Patterson
This study tested the hypothesis that ischemic preconditioning (IPC) would increase critical power (CP) during a 3 minute all-out cycling test. Twelve males completed two 3 minute all-out cycling tests, in a crossover design, separated by 7 days. These tests were preceded by IPC (4 x 5 minute intervals at 220 mmHg bilateral leg occlusion) or SHAM treatment (4 x 5 minute intervals at 20 mmHg bilateral leg occlusion). CP was calculated as the mean power output during the final 30 s of the 3 minute test with W' taken as the total work done above CP...
July 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28627041/prior-exercise-speeds-pulmonary-oxygen-uptake-kinetics-and-increases-critical-power-during-supine-but-not-upright-cycling
#19
Richie P Goulding, Denise M Roche, Simon Marwood
What is the central question of this study? Critical power (CP) represents the highest work rate for which a metabolic steady state is attainable. The physiological determinants of CP are unclear, but research suggests that CP might be related to the time constant of phase II oxygen uptake kinetics (τV̇O2). What is the main finding and its importance? We provide the first evidence that τV̇O2 is mechanistically related to CP. A reduction of τV̇O2 in the supine position was observed alongside a concomitant increase in CP...
June 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28617848/effect-of-caffeine-ingestion-on-anaerobic-capacity-quantified-by-different-methods
#20
RANDOMIZED CONTROLLED TRIAL
Lucyana Arcoverde, Rodrigo Silveira, Fabiano Tomazini, André Sansonio, Romulo Bertuzzi, Adriano Eduardo Lima-Silva, Victor Amorim Andrade-Souza
We investigated whether caffeine ingestion before submaximal exercise bouts would affect supramaximal oxygen demand and maximal accumulated oxygen deficit (MAOD), and if caffeine-induced improvement on the anaerobic capacity (AC) could be detected by different methods. Nine men took part in several submaximal and supramaximal exercise bouts one hour after ingesting caffeine (5 mg·kg-1) or placebo. The AC was estimated by MAOD, alternative MAOD, critical power, and gross efficiency methods. Caffeine had no effect on exercise endurance during the supramaximal bout (caffeine: 131...
2017: PloS One
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