The Experts below are selected from a list of 89004 Experts worldwide ranked by ideXlab platform
Louis-philippe Boulet - One of the best experts on this subject based on the ideXlab platform.
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athletes do not condition inspired air more effectively than nonathletes during hyperpnea
Medicine and Science in Sports and Exercise, 2017Co-Authors: Louis-philippe Boulet, Simonpierre Moreau, Helene Villeneuve, Julie TurmelAbstract:Endurance athletes have a high prevalence of airway diseases, some possibly representing Adaptive Mechanisms to the need of conditioning large volumes of inspired air during high ventilation in specific environments. The aim of this study is to assess the ability to condition (warm and humidify) inspired air in athletes by measuring the difference between inhaled and exhaled air temperature (ΔT) during and after eucapnic voluntary hyperpnea (EVH) test. Methods: Twenty-three endurance athletes from various sports, 12 with airway hyperresponsiveness (AHR) and/or exercise-induced bronchoconstriction (EIB) (A+), 11 without AHR and/or EIB (A−), 12 nonathletes with AHR and/or EIB (C+), and 11 nonathletes without AHR and/or EIB (C−) were recruited. All subjects attended the laboratory on three occasions, twice for baseline characterization, including questionnaires, pulmonary function, methacholine bronchoprovocation, allergy skin prick tests, exhaled nitric oxide measurement, and a standard EVH, and once to perform a modified EVH to assess ΔT. Inspired and expired air temperatures were measured with a high-precision probe during EVH and at regular intervals until 30 min after the end of the test. Results: The global ΔT during the EVH was +5.8°C ± 1.5°C and +4.7°C ± 1.5°C during the 30 min after the EVH. No difference was found between groups for either the ΔT or the slope of ΔT, during and after the EVH. Conclusion: This study shows no evidence of improved capacity to condition inspired air in endurance athletes, which could have suggested an increased bronchial blood flow or another Adaptive Mechanism. The absence of an Adaptive Mechanism could therefore contribute to airway damage observed in athletes in allowing colder but mainly dryer air to penetrate deeper in the lung.
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do athletes have an increased capacity to condition inspired air
European Respiratory Journal, 2016Co-Authors: Julie Turmel, Simonpierre Moreau, Helene Villeneuve, Louis-philippe BouletAbstract:Background: Endurance athletes have a high prevalence of airway diseases, some possibly representing Adaptive Mechanisms to the need of conditioning large volumes of inspired air during high ventilation in specific environments. Aim: To assess the ability of athletes to condition inspired air by measuring the difference between inhaled and exhaled air temperature (ΔT) during and after Eucapnic Voluntary Hyperpnea test (EVH). Methods: Twenty-three endurance athletes (12 with airway hyperresponsiveness (AHR) and/or exercise-induced bronchoconstriction (EIB) (A+), 11 withoutAHR and/or EIB (A-)) and 23 non-athletes (12 with AHR and/or EIB (C+) and 11 without AHR and/or EIB (C-)) were recruited. All subjects attended the laboratory on three occasions, twice for baseline characterization and once to perform a modified EVH for ΔT assessment. Inspired and expired air temperatures were measured with a high-precision probe during EVH and at regular intervals until 30 minutes after the end of the test. Results: The global ΔT during the EVH was +5.80±1.48°C and +4.73±1.51°C during the 30 minutes following the EVH. No difference was found between groups either for the ΔT or the slope of ΔT, during and after the EVH. Conclusion: This study shows no evidence of improved capacity to condition inspired air in endurance athletes, which could have suggested an increased bronchial blood flow or another Adaptive Mechanism. The absence of an Adaptive Mechanism could therefore contribute to airway damage observed in athletes in allowing colder but mainly dryer air to penetrate deeper in the lung.
Julie Turmel - One of the best experts on this subject based on the ideXlab platform.
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athletes do not condition inspired air more effectively than nonathletes during hyperpnea
Medicine and Science in Sports and Exercise, 2017Co-Authors: Louis-philippe Boulet, Simonpierre Moreau, Helene Villeneuve, Julie TurmelAbstract:Endurance athletes have a high prevalence of airway diseases, some possibly representing Adaptive Mechanisms to the need of conditioning large volumes of inspired air during high ventilation in specific environments. The aim of this study is to assess the ability to condition (warm and humidify) inspired air in athletes by measuring the difference between inhaled and exhaled air temperature (ΔT) during and after eucapnic voluntary hyperpnea (EVH) test. Methods: Twenty-three endurance athletes from various sports, 12 with airway hyperresponsiveness (AHR) and/or exercise-induced bronchoconstriction (EIB) (A+), 11 without AHR and/or EIB (A−), 12 nonathletes with AHR and/or EIB (C+), and 11 nonathletes without AHR and/or EIB (C−) were recruited. All subjects attended the laboratory on three occasions, twice for baseline characterization, including questionnaires, pulmonary function, methacholine bronchoprovocation, allergy skin prick tests, exhaled nitric oxide measurement, and a standard EVH, and once to perform a modified EVH to assess ΔT. Inspired and expired air temperatures were measured with a high-precision probe during EVH and at regular intervals until 30 min after the end of the test. Results: The global ΔT during the EVH was +5.8°C ± 1.5°C and +4.7°C ± 1.5°C during the 30 min after the EVH. No difference was found between groups for either the ΔT or the slope of ΔT, during and after the EVH. Conclusion: This study shows no evidence of improved capacity to condition inspired air in endurance athletes, which could have suggested an increased bronchial blood flow or another Adaptive Mechanism. The absence of an Adaptive Mechanism could therefore contribute to airway damage observed in athletes in allowing colder but mainly dryer air to penetrate deeper in the lung.
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do athletes have an increased capacity to condition inspired air
European Respiratory Journal, 2016Co-Authors: Julie Turmel, Simonpierre Moreau, Helene Villeneuve, Louis-philippe BouletAbstract:Background: Endurance athletes have a high prevalence of airway diseases, some possibly representing Adaptive Mechanisms to the need of conditioning large volumes of inspired air during high ventilation in specific environments. Aim: To assess the ability of athletes to condition inspired air by measuring the difference between inhaled and exhaled air temperature (ΔT) during and after Eucapnic Voluntary Hyperpnea test (EVH). Methods: Twenty-three endurance athletes (12 with airway hyperresponsiveness (AHR) and/or exercise-induced bronchoconstriction (EIB) (A+), 11 withoutAHR and/or EIB (A-)) and 23 non-athletes (12 with AHR and/or EIB (C+) and 11 without AHR and/or EIB (C-)) were recruited. All subjects attended the laboratory on three occasions, twice for baseline characterization and once to perform a modified EVH for ΔT assessment. Inspired and expired air temperatures were measured with a high-precision probe during EVH and at regular intervals until 30 minutes after the end of the test. Results: The global ΔT during the EVH was +5.80±1.48°C and +4.73±1.51°C during the 30 minutes following the EVH. No difference was found between groups either for the ΔT or the slope of ΔT, during and after the EVH. Conclusion: This study shows no evidence of improved capacity to condition inspired air in endurance athletes, which could have suggested an increased bronchial blood flow or another Adaptive Mechanism. The absence of an Adaptive Mechanism could therefore contribute to airway damage observed in athletes in allowing colder but mainly dryer air to penetrate deeper in the lung.
Jose Pereira - One of the best experts on this subject based on the ideXlab platform.
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improving transaction abort rates without compromising throughput through judicious scheduling
ACM Symposium on Applied Computing, 2013Co-Authors: Ana Rita Nunes, Jose PereiraAbstract:Althought optimistic concurrency control protocols have increasingly been used in distributed database management systems, they imply a trade-off between the number of transactions that can be executed concurrently, hence, the peak throughput, and transactions aborted due to conflicts. We propose a novel optimistic concurrency control Mechanism that controls transaction abort rate by minimizing the time during which transactions are vulnerable to abort, without compromising throughput. Briefly, we throttle transaction execution with an Adaptive Mechanism based on the state of the transaction queues while allowing out-of-order execution based on expected transaction latency. Preliminary evaluation shows that this provides a substantial improvement in committed transaction throughput.
Shadi Saleh - One of the best experts on this subject based on the ideXlab platform.
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informal healthcare provision in lebanon an Adaptive Mechanism among displaced syrian health professionals in a protracted crisis
Conflict and Health, 2019Co-Authors: Gladys Honeinabouhaidar, Sharif Ismail, Aya Noubani, Nour El Arnaout, Hana Nimer, Marilyne Menassa, Adam Coutts, Diana Rayes, Lamis Jomaa, Shadi SalehAbstract:Syrian healthcare workers (HCWs) are among those who fled the Syrian conflict only to face further social and economic challenges in host countries. In Lebanon, this population group cannot formally practice, yet many are believed to be operating informally. These activities remain poorly documented and misunderstood by the academic, policy and humanitarian communities. This study aims to understand Mechanisms of informal provision of services, the facilitators and barriers for such practices and to present policy recommendations for building on this Adaptive Mechanism. A qualitative descriptive study based on an in-depth interview approach with a sample of Syrian informal healthcare workers (IHCWs) residing in Lebanon was adopted. Known sponsor networks followed by snowball sampling approaches were used to recruit participants. Data collection occurred between September and December 2017. All interviews were audio-recorded, transcribed and translated into English. An inductive thematic analysis was used. Twenty-two participants were recruited. Motivational factors that led HCWs to practice informally were personal (e.g. source of income/livelihood), societal (cultural competency), and need to fulfill a gap in the formal health service sector. Being connected to a network of IHCWs facilitated initiation of the informal practice until eventually becoming part of a community of informal practice. The central challenge was the informal nature of their practice and its negative consequences. Most IHCWs were afraid of arrest by the government upon identification. Most interviewees indicated being discriminated against by host communities in the form of differential wages and tense interpersonal relationships. Almost all recommended a change in policy allowing them to practice formally under a temporary registration until their return to Syria. Our study confirmed the presence of IHCWs operating in Lebanon. Despite its informal nature, participants perceived that this practice was filling a gap in the formal health system and was helping to alleviate the burden of IHCWs and refugee health needs. In line with interviewees’ views, we recommend that policy decision makers within humanitarian agencies and the Government of Lebanon explore the possibilities for allowing temporary registration of displaced Syrian IHCW to benefit local host communities and refugee populations.
M Ouriagli - One of the best experts on this subject based on the ideXlab platform.
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implementation of a new mras speed sensorless vector control of induction machine
IEEE Transactions on Energy Conversion, 2015Co-Authors: Idriss Benlaloui, Said Drid, Larbi Chrifialaoui, M OuriagliAbstract:In this paper, a novel rotor speed estimation method using model reference Adaptive system (MRAS) is proposed to improve the performance of a sensorless vector control in the very low and zero speed regions. In the classical MRAS method, the rotor flux of the Adaptive model is compared with that of the reference model. The rotor speed is estimated from the fluxes difference of the two models using adequate Adaptive Mechanism. However, the performance of this technique at low speed remains uncertain and the MRAS loses its efficiency, but in the new MRAS method, two differences are used at the same time. The first is between rotor fluxes and the second between electromagnetic torques. The Adaptive Mechanism used in this new structure contains two parallel loops having Proportional-integral controller and low-pass filter. The first and the second loops are used to adjust the rotor flux and electromagnetic torque. To ensure good performance, a robust vector control using sliding mode control is proposed. The controllers are designed using the Lyapunov approach. Simulation and experimental results show the effectiveness of the proposed speed estimation method at low and zero speed regions, and good robustness with respect to parameter variations, measurement errors, and noise is obtained.