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Respiratory Compensation Point

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https://www.readbyqxmd.com/read/29334675/effects-of-running-retraining-on-biomechanical-factors-associated-with-lower-limb-injury
#1
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)...
January 12, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29320309/isocapnic-buffering-phase-a-useful-indicator-of-exercise-endurance-and-prognosis-in-patients-with-coronary-artery-disease
#2
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 (1stVT) 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 coronary artery disease (CAD) patients. 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 10, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29315165/exercise-thresholds-on-trial-are-they-really-equivalent
#3
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
#4
Alessandro Diodato, Andrea Cafarelli, Andrea Schiappacasse, Selene Tognarelli, Gastone C Ciuti, Arianna 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...
November 21, 2017: 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
#5
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
#6
Chung Chan, John Onofrey, Yiqiang Jian, Mary Germino, Xenophon Papademetris, Richard E Carson, Chi Liu
Respiratory motion during PET/CT imaging can cause significant image blurring and underestimation of tracer concentration for both static and dynamic studies. In this study, with the aim to eliminate both intra-cycle and inter-cycle motions, and apply to dynamic imaging, we developed a non-rigid event-byevent (NR-EBE) respiratory motion compensated list-mode reconstruction algorithm. The proposed method consists of 2 components, the first component estimates a continuous non-rigid motion field of the internal organs using the internal-external motion correlation (NR-INTEX)...
October 10, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28970805/quadriceps-muscles-o2-extraction-and-emg-breakpoints-during-a-ramp-incremental-test
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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 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. Motion is estimated from the MR volumes using deformable 3-D/3-D registration...
July 4, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28674603/mathematical-modeling-and-expression-of-heart-rate-deflection-point-using-heart-rate-and-oxygen-consumption
#14
Kayla M Baker, David H Fukuda, David D Church, Michael B LA Monica, Kyle S Beyer, Jay R Hoffman, Jeffrey R Stout
Heart rate deflection point (HRDP) can be determined through different mathematical-modeling procedures, such as bi-segmental linear regression (2SEG) or maximal distance model (Dmax). The purpose was to compare heart rate (HR) and oxygen consumption (VO2) at HRDP when using 2SEG and Dmax, and to examine their relationships with respiratory compensation point (RCP) and running performance. Nineteen participants completed a graded exercise test (GXT), to determine HRDP and RCP, and a 5km treadmill time trial (5Ktime)...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28524033/-procedural-analysis-of-acid-base-balance-disorder-case-serials-in-4-patents
#15
Chunyuan Ma, Guijie Wang
OBJECTIVE: To establish the standardization process of acid-base balance analysis, analyze cases of acid-base balance disorder with the aid of acid-base balance coordinate graph. METHODS: The acid-base balance theory were reviewed systematically on recent research progress, and the important concepts, definitions, formulas, parameters, regularity and inference in the analysis of acid-base balance were studied. The analysis of acid-base balance disordered processes and steps were figured...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28475960/health-risk-assessment-of-exposure-to-the-middle-eastern-dust-storms-in-the-iranian-megacity-of-kermanshah
#16
G Goudarzi, S M Daryanoosh, H Godini, P K Hopke, P Sicard, A De Marco, H D Rad, A Harbizadeh, F Jahedi, M J Mohammadi, J Savari, S Sadeghi, Z Kaabi, Y Omidi Khaniabadi
OBJECTIVE: This study assessed the effects of particulate matter (PM), equal or less than 10 μm in aerodynamic diameter (PM10), from the Middle-Eastern Dust events on public health in the megacity of Kermanshah (Iran). STUDY DESIGN: This study used epidemiological modeling and monitored ambient air quality data to estimate the potential PM10 impacts on public health. METHODS: The AirQ2.2.3 model was used to calculate mortality and morbidity attributed to PM10 as representative of dust events...
July 2017: Public Health
https://www.readbyqxmd.com/read/28466818/evaluation-of-relationship-between-aerobic-fitness-level-and-range-of-isocapnic-buffering-periods-during-incremental-exercise-test
#17
S Algul, O Ozcelik, B Yilmaz
The purpose of this study is to examine the relationship between the amount of O2 uptake (VO2) in the range of isocapnic buffering (ICB) periods and aerobic fitness levels of subjects with different exercise tolerance levels. A total of 50 young male subjects (20.8±0.4 years) performed an incremental exercise test using a cycle ergometer to determinetheir anaerobic threshold (AT), respiratory compensation point (RCP) and maximal exercise capacity (Wmax). The ICB period is defined as the region between AT and RCP...
March 31, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28414006/unit-cost-of-common-illness-management-a-comparison-between-a-primary-care-unit-and-a-community-pharmacy-in-thailand
#18
Kritsanee Saramunee, Chanuttha Ploylearmsang, Surasak Chaiyasong, Wiraphol Phimarn, Phayom Sookaneknun
Aim This study was to perform unit cost analysis of managing common illnesses comparing between a primary care unit (PCU) and a community pharmacy. BACKGROUND: PCU is a key point of access for primary care in Thailand. Although a community pharmacy is an ideal setting, it has not been successfully incorporated in Thailand's health service. Common illnesses are encountered everyday by community pharmacists, an appropriate compensation for this service has not been established. METHODS: A primary care service of one educational institution was a study site...
April 17, 2017: Primary Health Care Research & Development
https://www.readbyqxmd.com/read/28389601/anterior-cerebral-blood-velocity-and-end-tidal-co2-responses-to-exercise-differ-in-children-and-adults
#19
COMPARATIVE STUDY
Lindsay A Ellis, Philip N Ainslie, Victoria A Armstrong, Laura E Morris, Ryan G Simair, Nathan R Sletten, Christine M Tallon, Ali M McManus
Little is known about the response of the cerebrovasculature to acute exercise in children and how these responses might differ with adults. Therefore, we compared changes in middle cerebral artery blood velocity (MCAVmean), end-tidal Pco2 ([Formula: see text]), blood pressure, and minute ventilation (V̇e) in response to incremental exercise between children and adults. Thirteen children [age: 9 ± 1 (SD) yr] and thirteen sex-matched adults (age: 25 ± 4 yr) completed a maximal exercise test, during which MCAVmean, [Formula: see text], and V̇e were measured continuously...
June 1, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28370024/prefrontal-oxygenation-and-the-acoustic-startle-eyeblink-response-during-exercise-a-test-of-the-dual-mode-model
#20
Gavin D Tempest, Gaynor Parfitt
The interplay between the prefrontal cortex and amygdala is proposed to explain the regulation of affective responses (pleasure/displeasure) during exercise as outlined in the dual-mode model. However, due to methodological limitations the dual-mode model has not been fully tested. In this study, prefrontal oxygenation (using near-infrared spectroscopy) and amygdala activity (reflected by eyeblink amplitude using acoustic startle methodology) were recorded during exercise standardized to metabolic processes: 80% of ventilatory threshold (below VT), at the VT, and at the respiratory compensation point (RCP)...
March 30, 2017: Psychophysiology
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