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Respiratory Compensation Point

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https://www.readbyqxmd.com/read/29692152/-effects-of-different-rootstocks-on-the-weak-light-tolerance-ability-of-summer-black-grape-based-on-4-photo-response-models
#1
Xiao Han, Hai Bo Wang, Xiao di Wang, Xiang Bin Shi, Bao Liang Wang, Xiao Cui Zheng, Zhi Qiang Wang, Feng Zhi Liu
The photo response curves of 11 rootstock-scion combinations including summer black/Beta, summer black/1103P, summer black/101-14, summer black/3309C, summer black/140Ru, summer black/5C, summer black/5BB, summer black/420A, summer black/SO4, summer black/Kangzhen No.1, summer black/Huapu No.1 were fitted by rectangular hyperbola mo-del, non-rectangular hyperbola model, modified rectangular hyperbola model and exponential model respectively, and the differences of imitative effects were analyzed by determination coefficiency, light compensation point, light saturation point, initial quantum efficiency, maximum photosynthetic rate and dark respiration rate...
October 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29628297/evaluation-of-a-ct-guided-robotic-system-for-precise-percutaneous-needle-insertion
#2
Eliel Ben-David, Moran Shochat, Ido Roth, Isaac Nissenbaum, Jacob Sosna, S Nahum Goldberg
PURPOSE: To assess overall targeting accuracy for CT-guided needle insertion using prototype robotic system for common target sites. MATERIALS AND METHODS: Using CT guidance, metallic (2 × 1 mm) targets were embedded in retroperitoneum (n = 8), kidneys (n = 8), and liver (n = 14) of 8 Yorkshire pigs (55-65 kg). Bronchial bifurcations were targeted in the lung (n = 13). CT datasets were obtained for planning and controlled needle placement of commercially available 17- to 19-gauge needles (length 15-20 cm) using a small, patient-mounted, CT-guided robotic system with 5° of motion...
April 6, 2018: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/29573582/deformable-respiratory-motion-correction-for-hepatic-rotational-angiography
#3
Alexandra Klugmann, Bastian Bier, Kerstin Müller, Andreas Maier, Mathias Unberath
Cone-beam rotational angiography enables 3D imaging of the hepatic vasculature and is considered beneficial for guidance of transcatheter arterial chemoembolization procedures. Respiratory motion during the rotational acquisition challenges state-of-the-art reconstruction algorithms as intra-scan motion leads to inconsistencies causing substantial blurring and streaking artifacts in uncompensated reconstructions, suggesting the need for motion correction. We propose an automated method for respiratory motion estimation and compensation based on registration of an initial 3D arterial model to vesselness enhanced 2D projection images...
March 17, 2018: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/29563293/characterization-of-h5n1-influenza-virus-quasispecies-with-adaptive-hemagglutinin-mutations-from-single-virus-infections-of-human-airway-cells
#4
Yohei Watanabe, Yasuha Arai, Norihito Kawashita, Madiha S Ibrahim, Emad M Elgendy, Tomo Daidoji, Junichi Kajikawa, Hiroaki Hiramatsu, Nongluk Sriwilaijaroen, Takao Ono, Tatsuya Takagi, Kazuo Takahashi, Tatsuo Shioda, Kazuhiko Matsumoto, Yasuo Suzuki, Takaaki Nakaya
Transmission of avian influenza (AI) viruses to mammals involves phylogenetic bottlenecks that select small numbers of variants for transmission to new host species. However, little is known about the AI virus quasispecies diversity that produces variants for virus adaptation to humans. Here, we analyzed the hemagglutinin (HA) genetic diversity produced during AI H5N1 single-virus infection of primary human airway cells and characterized the phenotypes of these variants. During single-virus infection, HA variants emerged with increased fitness to infect human cells...
March 21, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29475209/perceptually-regulated-exercise-test-allows-determination-of-v%C3%AB-o2max-and-ventilatory-threshold-but-not-respiratory-compensation-point-in-trained-runners
#5
Perrine Truong, Gregoire P Millet, Boris Gojanovic
This study aimed to investigate the differences in maximal oxygen uptake (V̇O2max ) and submaximal thresholds between a standard graded exercise test (GXT) and a perceptually regulated graded exercise test (PRGXT) in trained runners. Eleven well-trained middle- to long-distance runners performed both tests in a randomized order. PRGXT used incremental "clamps" of rating of perceived exertion (RPE) over 10×1-min stages on an automated treadmill equipped with a sonar sensor allowing them to change their running speed instantly and in a natural way...
April 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29428343/aerobic-stimulus-induced-by-virtual-reality-games-in-stroke-survivors
#6
Julio Cesar Silva de Sousa, Camila Torriani-Pasin, Amanda Barboza Tosi, Rafael Yokoyama Fecchio, Luiz Augusto Riani Costa, Cláudia Lúcia de Moraes Forjaz
OBJECTIVE: To evaluate whether virtual reality games (VRGs) in stroke survivors produce significant and reproducible heart rate and oxygen consumption (V˙o2 ) responses during their execution, corresponding to an intensity between the anaerobic threshold (AT) and the respiratory compensation point (RCP). DESIGN: Single-subject, repeated-measure design. SETTING: Stroke survivors registered from a rehabilitation program. PARTICIPANTS: Chronic hemiparetic stroke survivors (N=12; 10 men; mean age ± SD, 58±12y) rated at 3 or 4 in the Functional Ambulation Categories...
May 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29419891/technical-note-kinect-v2-surface-filtering-during-gantry-motion-for-radiotherapy-applications
#7
Souha Nazir, Sandy Rihana, Dimitris Visvikis, Hadi Fayad
PURPOSE: In radiotherapy, the Kinect V2 camera, has recently received a lot of attention concerning many clinical applications including patient positioning, respiratory motion tracking, and collision detection during the radiotherapy delivery phase. However, issues associated with such applications are related to some materials and surfaces reflections generating an offset in depth measurements especially during gantry motion. This phenomenon appears in particular when the collimator surface is observed by the camera; resulting in erroneous depth measurements, not only in Kinect surfaces itself, but also as a large peak when extracting a 1D respiratory signal from these data...
April 2018: Medical Physics
https://www.readbyqxmd.com/read/29334675/effects-of-running-retraining-on-biomechanical-factors-associated-with-lower-limb-injury
#8
Marcus D Dunn, David B Claxton, Graham Fletcher, Jonathan S Wheat, David M Binney
Injury risk is an important concern for runners; however, limited evidence exists regarding changes to injury risk following running style retraining. Biomechanical factors, such as absolute peak free moment, knee abduction impulse, peak foot eversion and foot eversion excursion, have been shown to predict lower limb injury. The aim of this study was to assess the effects of Pose running retraining on biomechanical factors associated with lower limb running injury. Twenty uninjured recreational runners were pair-matched based on their five km run time performance and randomly assigned to control (n = 10) and intervention (three 2-h Pose running retraining sessions) groups (n = 10)...
April 2018: Human Movement Science
https://www.readbyqxmd.com/read/29320309/isocapnic-buffering-phase-a-useful-indicator-of-exercise-endurance-in-patients-with-coronary-artery-disease
#9
Yun-Shan Yen, Daniel Chiung Jui Su, Kuo-Shu Yuan, Po-Wei Chen, Julie Chi Chow, Willy Chou
OBJECTIVES: The significance of the isocapnic buffering (IB) phase - the period between the first ventilatory threshold (1st VT) and respiratory compensation point (RCP) - has not been adequately established in patients. This study aimed to determine the clinical significance of the IB phase in patients with coronary artery disease (CAD). METHODS: This retrospective study included data of sixty-two CAD patients after coronary artery bypass graft (CABG) or percutaneous coronary intervention (PCI) performed in a single medical center between 2010 - 2014...
January 20, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29315165/exercise-thresholds-on-trial-are-they-really-equivalent
#10
Kevin Caen, Kobe Vermeire, Jan G Bourgois, Jan Boone
PURPOSE: The interchangeable use of whole-body exercise thresholds and breakpoints (BPs) in the local oxygenation response, as measured via near-infrared spectroscopy (NIRS), has recently been questioned in scientific literature. Therefore, the present study aimed to longitudinally investigate the interrelationship of four commonly used exercise thresholds: critical power (CP), the respiratory compensation point (RCP) and BPs in muscle (m[HHb]BP) and brain (c[O2Hb]BP) oxygenation. METHODS: Nine male participants (21...
January 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29160777/motion-compensation-with-skin-contact-control-for-high-intensity-focused-ultrasound-surgery-in-moving-organs
#11
A Diodato, A Cafarelli, A Schiappacasse, S Tognarelli, G Ciuti, A Menciassi
High intensity focused ultrasound (HIFU) is an emerging therapeutic solution that enables non-invasive treatment of several pathologies, mainly in oncology. On the other hand, accurate targeting of moving abdominal organs (e.g. liver, kidney, pancreas) is still an open challenge. This paper proposes a novel method to compensate the physiological respiratory motion of organs during HIFU procedures, by exploiting a robotic platform for ultrasound-guided HIFU surgery provided with a therapeutic annular phased array transducer...
January 26, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29082079/robust-tracking-of-respiratory-rate-in-high-dynamic-range-scenes-using-mobile-thermal-imaging
#12
Youngjun Cho, Simon J Julier, Nicolai Marquardt, Nadia Bianchi-Berthouze
The ability to monitor the respiratory rate, one of the vital signs, is extremely important for the medical treatment, healthcare and fitness sectors. In many situations, mobile methods, which allow users to undertake everyday activities, are required. However, current monitoring systems can be obtrusive, requiring users to wear respiration belts or nasal probes. Alternatively, contactless digital image sensor based remote-photoplethysmography (PPG) can be used. However, remote PPG requires an ambient source of light, and does not work properly in dark places or under varying lighting conditions...
October 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29028189/non-rigid-event-by-event-continuous-respiratory-motion-compensated-list-mode-reconstruction-for-pet
#13
Chung Chan, John Onofrey, Yiqiang Jian, Mary Germino, Xenophon Papademetris, Richard E Carson, Chi Liu
Respiratory motion during positron emission tomography (PET)/computed tomography (CT) imaging can cause significant image blurring and underestimation of tracer concentration for both static and dynamic studies. In this paper, with the aim to eliminate both intra-cycle and inter-cycle motions, and apply to dynamic imaging, we developed a non-rigid event-by-event (NR-EBE) respiratory motion-compensated list-mode reconstruction algorithm. The proposed method consists of two components: the first component estimates a continuous non-rigid motion field of the internal organs using the internal-external motion correlation...
February 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28970805/quadriceps-muscles-o2-extraction-and-emg-breakpoints-during-a-ramp-incremental-test
#14
Danilo Iannetta, Ahmad Qahtani, Guillaume Y Millet, Juan M Murias
Muscle deoxygenated breakpoint ([HHb]BP) has been found to be associated with other indices of exercise tolerance in the vastus lateralis (VL) muscle but not in the vastus medialis (VM) and rectus femoris (RF). Purpose: To investigate whether the [HHb]BP occurs also in the VM and RF muscles and whether or not it is associated with other physiological indices of exercise tolerance, such as the EMG threshold (EMGt) and the respiratory compensation point (RCP). Methods: Twelve young endurance trained participants performed maximal ramp incremental (RI) cycling tests (25-30 W·min(-1) increments)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28943696/automated-3d-coronary-sinus-catheter-detection-using-a-scanning-beam-digital-x-ray-system
#15
David A P Dunkerley, Jordan M Slagowski, Lindsay E Bodart, Michael A Speidel
Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3D tracking of catheter electrodes concurrent with fluoroscopic display. To facilitate respiratory motion-compensated 3D catheter tracking, an automated coronary sinus (CS) catheter detection algorithm for SBDX was developed. The technique uses the 3D localization capability of SBDX and prior knowledge of the catheter shape. Candidate groups of points representing the CS catheter are obtained from a 3D shape-constrained search...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28888990/chemicals-or-mutations-that-target-mitochondrial-translation-can-rescue-the-respiratory-deficiency-of-yeast-bcs1-mutants
#16
C Panozzo, A Laleve, D Tribouillard-Tanvier, J Ostojić, C H Sellem, G Friocourt, A Bourand-Plantefol, A Burg, A Delahodde, M Blondel, G Dujardin
Bcs1p is a chaperone that is required for the incorporation of the Rieske subunit within complex III of the mitochondrial respiratory chain. Mutations in the human gene BCS1L (BCS1-like) are the most frequent nuclear mutations resulting in complex III-related pathologies. In yeast, the mimicking of some pathogenic mutations causes a respiratory deficiency. We have screened chemical libraries and found that two antibiotics, pentamidine and clarithromycin, can compensate two bcs1 point mutations in yeast, one of which is the equivalent of a mutation found in a human patient...
December 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28878694/physiological-responses-to-firefighting-in-extreme-temperatures-do-not-compare-to-firefighting-in-temperate-conditions
#17
Stephanie Windisch, Wolfgang Seiberl, Daniel Hahn, Ansgar Schwirtz
Purpose: The aim of this study was to examine physiological responses to two different simulated firefighting exercises: a firefighting exercise with flashovers, smoke, poor visibility and extreme temperatures (300°) in a burning container and a standard firefighting exercise in temperate conditions. Furthermore, a second purpose of the study was to find out if the contribution of strength and endurance capacities to firefighting performance changes when the demands of the firefighting exercise change. Methods: Sixteen professional firefighters performed a maximum treadmill test, strength testing, a standard simulated firefighting exercise (SFE) without heat and flashovers and a firefighting exercise with a simulation of the flashover phenomenon in a burning container (FOT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28838335/comparative-determination-of-ventilatory-efficiency-from-constant-load-and-incremental-exercise-testing
#18
S Algul, F A Ugur, A Ayar, O Ozcelik
The analysis of the relationships between minute ventilation (VE) to CO2 output (VCO2), referred to as ventilatory efficiency, in response to incremental exercise testing, is considered a useful index for assessing the presence and severity of cardiopulmonary and metabolic diseases. The effects of constant load exercise testing performed at work intensity associated with anaerobic threshold (AT) and respiratory compensation points (RCP), on the accurate measurements of ventilatory efficiency are not well known...
August 15, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28713464/a-rapidly-incremented-tethered-swimming-test-for-defining-domain-specific-training-zones
#19
Dalton M Pessôa Filho, Leandro O C Siqueira, Astor R Simionato, Mário A C Espada, Daniel S Pestana, Fred J DiMenna
The purpose of this study was to investigate whether a tethered-swimming incremental test comprising small increases in resistive force applied every 60 seconds could delineate the isocapnic region during rapidly-incremented exercise. Sixteen competitive swimmers (male, n = 11; female, n = 5) performed: (a) a test to determine highest force during 30 seconds of all-out tethered swimming (Favg) and the ΔF, which represented the difference between Favg and the force required to maintain body alignment (Fbase), and (b) an incremental test beginning with 60 seconds of tethered swimming against a load that exceeded Fbase by 30% of ΔF followed by increments of 5% of ΔF every 60 seconds...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28692969/an-mr-based-model-for-cardio-respiratory-motion-compensation-of-overlays-in-x-ray-fluoroscopy
#20
Peter Fischer, Anthony Faranesh, Thomas Pohl, Andreas Maier, Toby Rogers, Kanishka Ratnayaka, Robert Lederman, Joachim Hornegger
In X-ray fluoroscopy, static overlays are used to visualize soft tissue. We propose a system for cardiac and respiratory motion compensation of these overlays. It consists of a 3-D motion model created from real-time magnetic resonance (MR) imaging. Multiple sagittal slices are acquired and retrospectively stacked to consistent 3-D volumes. Slice stacking considers cardiac information derived from the ECG and respiratory information extracted from the images. Additionally, temporal smoothness of the stacking is enhanced...
January 2018: IEEE Transactions on Medical Imaging
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