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https://www.readbyqxmd.com/read/28214493/the-value-of-near-infrared-spectroscopy-for-the-assessment-of-calf-muscle-function-in-venous-patients
#1
Spyros N Vasdekis, Ioannis Tzemailas, Constantine N Antonopoulos, Sotiria Mastoraki, George K Mantas, Andreas Lazaris
OBJECTIVE: Near-infrared spectroscopy (NIRS) is a noninvasive technique with the potential to determine the degree of tissue oxygenation. The aim of the current study was to investigate the use of NIRS as a reliable method of detecting calf muscle pump dysfunction in groups of patients with venous disease. METHODS: Patients with superficial venous insufficiency (SVI) or history of deep venous thrombosis (DVT) were classified according to the comprehensive classification system for chronic venous disorders (clinical class, etiology, anatomy, and pathophysiology) and compared with controls (GROUP variable)...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28211952/long-term-experience-with-first-generation-implantable-neurostimulation-device-in-central-sleep-apnea-treatment
#2
Henrik Fox, Thomas Bitter, Dieter Horstkotte, Olaf Oldenburg, Klaus-Jürgen Gutleben
BACKGROUND: Sleep-disordered breathing (SDB) and Cheyne-Stokes respiration (CSR) are associated with shorter survival in patients with heart failure (HF). A novel treatment method for this patient group is unilateral phrenic nerve stimulation by the remedē® system, a transvenously implantable neurostimulation device, which has recently been studied in a large randomized, controlled trial. Previous literature has shown efficacy and safety of the treatment with this first-generation device, but hardly any data is available on long-term clinical parameters, the remedē® device's battery lifetime, device exchangeability, lead position stability, surgical accessibility and manageability...
February 17, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28165859/exercise-induced-hypoxemia-in-juvenile-thyroid-carcinoma-with-lung-metastases
#3
Florian J Segerer, Johannes Biko, Christoph Reiners, Clemens Wirth, Helge Hebestreit
PURPOSE: Exercise-induced arterial hypoxemia (EIAH) has been reported in patients with juvenile thyroid cancer treated with radioiodine for lung metastases. This retrospective study tested the hypothesis that EIAH is due to ventilation-perfusion-mismatch in this rare pulmonary condition. METHOD: 50 patients (age 13 -23 years) treated for juvenile thyroid carcinoma and lung metastasis with 131I and 24 controls with thyroid cancer but without lung metastases and prior 131I-treatment were assessed in a state of acute hypothyroidism by computed tomography of the lungs, pulmonary function testing, cardiopulmonary exercise test with measurements of gas exchange, oxygen saturation, alveolar-arterial difference in pO2 (p(A-a)O2) and pCO2 (p(ET-a)CO2)...
February 6, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28151429/the-influence-of-adipose-tissue-on-spatially-resolved-near-infrared-spectroscopy-derived-skeletal-muscle-oxygenation-the-extent-of-the-problem
#4
Victor M Niemeijer, Jasper Jansen, Thomas van Dijk, Ruud Spee, Eduard Meijer, Hareld Kemps, Pieter Wijn
OBJECTIVE: Near-infrared spectroscopy (NIRS) measurements of tissue oxygen saturation (StO2) are useful for the assessment of skeletal muscle perfusion and function during exercise, however, they are influenced by overlying skin and adipose tissue. This study explored the extent and nature of the influence of adipose tissue thickness (ATT) on StO2. APPROACH: NIR spatially resolved spectroscopy (SRS) derived oxygenation was measured on vastus lateralis in 56 patients with chronic heart failure (CHF) and 20 healthy control (HC) subjects during rest and moderate intensity exercise with simultaneous assessment of oxygen uptake kinetics (tauVO2onset)...
February 2, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28149350/the-influence-of-high-altitude-acclimatization-on-ventilatory-and-blood-oxygen-saturation-responses-during-normoxic-and-hypoxic-testing
#5
Anton Ušaj, Stojan Burnik
We investigated how acclimatization effects achieved during a high-altitude alpinist expedition influence endurance performance, ventilation ([Formula: see text]) and blood oxygen saturation (SaO2) in normoxic (NOR) and hypoxic conditions (HYP). An incremental testing protocol on a cycle ergometer was used to determine the power output corresponding to the Lactate (PLT) and Ventilatory Threshold (PVT) in NOR and HYP (FiO2=0.13) as indirect characteristics of endurance performance in both conditions. Furthermore, changes in [Formula: see text], SaO2, blood pH and Pco2 were measured at a similar absolute exercise intensity of 180 W in NOR and HYP conditions...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28144415/acute-cardiovascular-and-hemodynamic-responses-to-low-intensity-eccentric-resistance-exercise-with-blood-flow-restriction
#6
Behzad Bazgir, Mojtaba Rezazadeh Valojerdi, Hamid Rajabi, Rouhollah Fathi, Seyed Mojtaba Ojaghi, Mohammad Kazem Emami Meybodi, Gabriel R Neto, Mostafa Rahimi, Alireza Asgari
BACKGROUND: Recently it has been suggested that low intensity (LI) resistance exercise (RE) alone or in combination with blood flow restriction (BFR) can be applied for cardiovascular function improvement or rehabilitation. OBJECTIVES: The aim of the present study was to investigate the acute effects of LI eccentric RE with and without BFR on heart rate (HR), rate pressure product (RPP), blood pressure (BP) parameters [systolic, diastolic, and mean arterial pressure (MAP)], oxygen saturation (SpO2) and rate of perceived exertion (RPE)...
December 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/28140421/personer-med-kol-beh%C3%A3-ver-tr%C3%A3-na-%C3%A3-kad-fysisk-aktivitet-kan-f%C3%A3-rb%C3%A3-ttra-livskvalitet-dyspn%C3%A3-kondition-och-styrka-och-minska-risken-f%C3%A3-r-f%C3%A3-rtida-d%C3%A3-d
#7
Margareta Emtner, Karin Wadell
Persons with COPD should be recommended training Persons with chronic obstructive pulmonary disease (COPD) should be recommended aerobic and resistance training to be able to improve quality of life and physical capacity, and to decrease dyspnoea, anxiety and depression (moderately strong scientific evidence - quality of evidence grade 3). Subjects with an exacerbation should be recommended training at a low intensity in direct connection with the exacerbation to improve quality of life and physical capacity (moderately strong scientific evidence - quality of evidence grade 3), and to lower the risk of mortality and hospitalization (limited scientific evidence - quality of evidence grade 2)...
January 26, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28111407/determinants-of-aortic-size-and-stiffness-and-the-impact-on-exercise-physiology-in-patients-after-the-fontan-operation
#8
Hideo Ohuchi, Yosuke Hayama, Jun Negishi, Kanae Noritake, Aya Miyazaki, Osamu Yamada, Isao Shiraishi
The pathophysiology of congenital heart disease includes aortic dilation and increased stiffness. However, the clinical determinants and significance remain unclear in patients after the Fontan operation.Size and stiffness index (SI) of the ascending and descending aorta (aAO and dAO, respectively) were assessed using angiography in 130 consecutive Fontan patients and 30 age-matched controls. Compared with controls, Fontan patients showed a dilated aAO and smaller dAO (P < 0.0001) with greater SI (3.2 ± 0...
February 7, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28108649/intracellular-oxygen-tension-limits-muscle-contraction-induced-change-in-muscle-oxygen-consumption-under-hypoxic-conditions-during-hb-free-perfusion
#9
Hisashi Takakura, Minoru Ojino, Thomas Jue, Tatsuya Yamada, Yasuro Furuichi, Takeshi Hashimoto, Satoshi Iwase, Kazumi Masuda
Under acute hypoxic conditions, the muscle oxygen uptake (mV˙O2) during exercise is reduced by the restriction in oxygen-supplied volume to the mitochondria within the peripheral tissue. This suggests the existence of a factor restricting the mV˙O2 under hypoxic conditions at the peripheral tissue level. Therefore, this study set out to test the hypothesis that the restriction in mV˙O2 is regulated by the net decrease in intracellular oxygen tension equilibrated with myoglobin oxygen saturation (∆PmbO2) during muscle contraction under hypoxic conditions...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28076590/effect-of-maternal-exercises-on-biophysical-fetal-and-maternal-parameters-a-transversal-study
#10
Caroline Mombaque Dos Santos, Wendel Mombaque Dos Santos, Francisco Maximiliano Pancich Gallarreta, Camila Pigatto, Luiz Osório Cruz Portela, Edson Nunes de Morais
Objective: To evaluate the acute effects of maternal and fetal hemodynamic responses in pregnant women submitted to fetal Doppler and an aerobic physical exercise test according to the degree of effort during the activity and the impact on the well-being. Methods: Transversal study with low risk pregnant women, obtained by convenience sample with gestational age between 26 to 34 weeks. The participants carry out a progressive exercise test. Results: After the exercise session, reduced resistance (p=0...
October 2016: Einstein
https://www.readbyqxmd.com/read/28074672/a-power-assisted-exercise-intervention-in-people-with-profound-intellectual-and-multiple-disabilities-living-in-a-residential-facility-a-pilot-randomised-controlled-trial
#11
Leontien Wm Bossink, Annette Aj van der Putten, Aly Waninge, Carla Vlaskamp
OBJECTIVE: To assess the feasibility of conducting a randomised controlled trial to determine the effectiveness of a twenty-week power-assisted exercise intervention in people with profound intellectual and multiple disabilities and to evaluate the potential beneficial effects of this intervention. DESIGN: Pilot randomised controlled trial. SETTING: A large-scale twenty-four-hour residential facility in the Netherlands. SUBJECTS: Thirty-seven persons with profound intellectual and multiple disabilities...
January 1, 2017: Clinical Rehabilitation
https://www.readbyqxmd.com/read/28064156/high-prevalence-of-baffle-leaks-in-adults-after-atrial-switch-operations-for-transposition-of-the-great-arteries
#12
Gabriella De Pasquale, Francesca Bonassin Tempesta, Bruno Santos Lopes, Daniela Babic, Angela Oxenius, Theresa Seeliger, Christiane Gruner, Felix C Tanner, Patric Biaggi, Christine Attenhofer Jost, Matthias Greutmann
AIMS: To determine the prevalence of baffle leaks in adults after atrial switch operations for transposition of the great arteries, as these may predispose to paradoxical embolic events, particularly in patients with transvenous pacemaker or defibrillator leads. METHODS AND RESULTS: We routinely perform contrast echocardiography with agitated saline in all patients after atrial switch operations. For this study, we analysed patients who had saline contrast echocardiography between 2010 and 2012...
January 6, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28057577/heterogeneity-of-blood-flow-and-metabolism-during-exercise-in-patients-with-chronic-obstructive-pulmonary-disease
#13
Zafeiris Louvaris, Helmut Habazettl, Andreas Asimakos, Harrieth Wagner, Spyros Zakynthinos, Peter D Wagner, Ioannis Vogiatzis
The study investigated whether the capacity to regulate muscle blood flow (Q) relative to metabolic demand (VO2) is impaired in COPD. Using six NIRS optodes over the upper, middle and lower vastus lateralis in 6 patients, (FEV1:46±12%predicted) we recorded from each: a) Q by indocyanine green dye injection, b) VO2/Q ratios based on fractional tissue O2 saturation and c) VO2 as their product, during constant-load exercise (at 20%, 50% and 80% of peak capacity) in normoxia and hyperoxia (FIO2:1.0). At 50 and 80%, relative dispersion (RD) for Q, but not for VO2, was greater in normoxia (0...
March 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28032333/the-effect-of-%C3%AE-1-adrenergic-blockade-on-post-exercise-brachial-artery-flow-mediated-dilatation-at-sea-level-and-high-altitude
#14
Michael M Tymko, Joshua C Tremblay, Alex B Hansen, Connor A Howe, Chris K Willie, Mike Stembridge, Daniel J Green, Ryan L Hoiland, Prajan Subedi, James D Anholm, Philip N Ainslie
KEY POINTS: Our objective was to quantify endothelial function (via brachial artery flow-mediated dilatation) at sea level (344 m) and high altitude (3800 m) at rest and following both maximal exercise and 30 min of moderate-intensity cycling exercise with and without administration of an α1 -adrenergic blockade. Brachial endothelial function did not differ between sea level and high altitude at rest, nor following maximal exercise. At sea level, endothelial function decreased following 30 min of moderate-intensity exercise, and this decrease was abolished with α1 -adrenergic blockade...
November 7, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/28018244/differences-in-muscle-oxygenation-perceived-fatigue-and-recovery-between-long-track-and-short-track-speed-skating
#15
Florentina J Hettinga, Marco J Konings, Chris E Cooper
Due to the technical nature of speed skating, that is affecting physiological mechanisms such as oxygenation and blood flow, this sport provides a unique setting allowing us to uncover novel mechanistic insights of the physiological response to exercise in elite middle-distance and endurance sports. The present study aimed to examine the influence of skating mode (short-track vs. long-track) on muscle oxygenation, perceived fatigue, and recovery in elite speed skating. Muscle oxygenation of 12 talented short-track speed skaters was continuously monitored during a long-track (LT) and a short-track (ST) skating time-trial of maximal effort using near-infrared spectroscopy (NIRS) on the m...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/28009532/feed-forward-regulation-of-self-selected-exercise-intensity-in-response-to-different-rates-of-arterial-deoxygenation
#16
Saro D Farra
Arterial desaturation impairs exercise performance in a dose-dependent manner. However, new theories of exercise-induced fatigue suggest that increasing rates of arterial deoxygenation augment the fatigue response during exercise. The purpose of this dissertation is to clarify if self-selected exercise intensity, while exercising at a constant rate of perceived exertion (RPE), is sensitive to alterations in the absolute arterial saturation (SPO2) and/or the rate of change in SPO2. Subjects performed constant RPE exercise for 30 min...
January 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27942271/recent-developments-in-near-infrared-spectroscopy-nirs-for-the-assessment-of-local-skeletal-muscle-microvascular-function-and-capacity-to-utilise-oxygen
#17
REVIEW
Siana Jones, Scott T Chiesa, Nishi Chaturvedi, Alun D Hughes
PURPOSE OF REVIEW: Continuous wave near infrared spectroscopy (CW NIRS) provides non-invasive technology to measure relative changes in oxy- and deoxy-haemoglobin in a dynamic environment. This allows determination of local skeletal muscle O2 saturation, muscle oxygen consumption ([Formula: see text]) and blood flow. This article provides a brief overview of the use of CW NIRS to measure exercise-limiting factors in skeletal muscle. RECENT FINDINGS: NIRS parameters that measure O2 delivery and capacity to utilise O2 in the muscle have been developed based on response to physiological interventions and exercise...
December 2016: Artery Research
https://www.readbyqxmd.com/read/27931056/-guideline-s2k-awmf-of-the-deutsche-gesellschaft-f%C3%A3-r-pneumologie-und-beatmungsmedizin-and-the-deutsche-gesellschaft-f%C3%A3-r-arbeitsmedizin-und-umweltmedizin-diagnostics-and-expert-opinion-in-the-occupational-disease-no-4101-silicosis-including-coal-worker-s-pneumoconiosis
#18
X Baur, M Heger, R M Bohle, K G Hering, K Hofmann-Preiß, D Nowak, A Tannapfel, H Teschler, T Voshaar, T Kraus
During the last 1.5 years an update of the guideline on silicosis was made by an interdisciplinary working group. New medical and scientific knowledge and the experience in expert opinion practice were taken into account.By preparing the initial guideline in 2010 standardization of diagnostics and adaption of the "Moers convention" which was not based on medical knowledge was in the focus, whereas the current update deals with fine emendation and extension, especially of the compensation rate (adaption with the Reichenhall recommendation)...
December 2016: Pneumologie
https://www.readbyqxmd.com/read/27920514/usefulness-of-the-6-minute-walk-test-as-a-screening-test-for-pulmonary-arterial-enlargement-in-copd
#19
Yutaro Oki, Masahiro Kaneko, Yukari Fujimoto, Hideki Sakai, Shogo Misu, Yuji Mitani, Takumi Yamaguchi, Hisafumi Yasuda, Akira Ishikawa
PURPOSE: Pulmonary hypertension and exercise-induced oxygen desaturation (EID) influence acute exacerbation of COPD. Computed tomography (CT)-detected pulmonary artery (PA) enlargement is independently associated with acute COPD exacerbations. Associations between PA to aorta (PA:A) ratio and EID in patients with COPD have not been reported. We hypothesized that the PA:A ratio correlated with EID and that results of the 6-minute walk test (6MWT) would be useful for predicting the risk associated with PA:A >1...
2016: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/27901314/effects-of-hypoxia-and-hypercapnic-hypoxia-on-oxygen-transport-and-acid-base-status-in-the-atlantic-blue-crab-callinectes-sapidus-during-exercise
#20
Mark P Lehtonen, Louis E Burnett
The responses of estuarine invertebrates to hypoxic conditions are well established. However, many studies have investigated hypoxia as an isolated condition despite its frequent co-occurrence with hypercapnia (elevated CO2 ). Although many studies suggest deleterious effects, hypercapnia has been observed to improve blue crab walking performance in hypoxia. To investigate the physiological effects of combined hypercapnic hypoxia, we measured Po2 , pH, [l-lactate], Pco2 , and total O2 in pre- and postbranchial hemolymph sampled from blue crabs during walking exercise...
November 2016: Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
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