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near infrared spectroscopy muscle oxygen

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https://www.readbyqxmd.com/read/28647868/effects-of-high-altitude-exposure-on-supraspinal-fatigue-and-corticospinal-excitability-and-inhibition
#1
Mathieu Marillier, Pierrick J Arnal, Thibault Le Roux Mallouf, Thomas Rupp, Guillaume Y Millet, Samuel Verges
PURPOSE: While acute hypoxic exposure enhances exercise-induced central fatigue and can alter corticospinal excitability and inhibition, the effect of prolonged hypoxic exposure on these parameters remains to be clarified. We hypothesized that 5 days of altitude exposure would (i) normalize exercise-induced supraspinal fatigue during isolated muscle exercise to sea level (SL) values and (ii) increase corticospinal excitability and inhibition. METHODS: Eleven male subjects performed intermittent isometric elbow flexions at 50% of maximal voluntary contraction to task failure at SL and after 1 (D1) and 5 (D5) days at 4350 m...
June 24, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28622081/effects-of-inspiratory-muscle-training-in-professional-women-football-players-a-randomized-sham-controlled-trial
#2
Bruno Archiza, Daniela Kuguimoto Andaku, Flávia Cristina Rossi Caruso, José Carlos Bonjorno, Cláudio Ricardo de Oliveira, Paula Angélica Ricci, André Capaldo do Amaral, Stela Márcia Mattiello, Cleiton Augusto Libardi, Shane A Phillips, Ross Arena, Audrey Borghi-Silva
This study was conducted to determine the effects of inspiratory muscle training (IMT) on respiratory and peripheral muscles oxygenation during a maximal exercise tolerance test and on repeated-sprint ability (RSA) performance in professional women football players. Eighteen athletes were randomly assigned to one of the following groups: SHAM (n = 8) or IMT (n = 10). After a maximal incremental exercise test, all participants performed (on a different day) a time-to-exhaustion (Tlim) test. Peripheral and respiratory muscles oxygenation by near-infrared spectroscopy, breath-by-breath ventilatory and metabolic variables, and blood lactate concentration were measured...
June 16, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28617704/greater-oxidative-capacity-in-primary-myotubes-from-endurance-trained-women
#3
Timothy D Heden, Terence E Ryan, Patrick J Ferrara, Robert C Hickner, Patricia M Brophy, P Darrell Neufer, Joseph M McClung, Katsuhiko Funai
PURPOSE: Exercise training promotes skeletal muscle mitochondrial biogenesis and an increase in maximal oxygen consumption. Primary myotubes retain some metabolic properties observed in vivo but it is unknown whether this includes exercise-induced mitochondrial adaptations. The goal of this study was to test if primary myotubes from exercise-trained women have higher mitochondrial content and maximal oxygen consumption compared to untrained women. METHODS: Six trained and nine untrained Caucasian women participated in this study...
June 14, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28616108/advances-in-basic-science-methodologies-for-clinical-diagnosis-in-female-stress-urinary-incontinence
#4
REVIEW
Marwa Abdulaziz, Emily G Deegan, Alex Kavanagh, Lynn Stothers, Denise Pugash, Andrew Macnab
We provide an overview of advanced imaging techniques currently being explored to gain greater understanding of the complexity of stress urinary incontinence (SUI) through better definition of structural anatomic data. Two methods of imaging and analysis are detailed for SUI with or without prolapse: 1) open magnetic resonance imaging (MRI) with or without the use of reference lines; and 2) 3D reconstruction of the pelvis using MRI. An additional innovative method of assessment includes the use of near infrared spectroscopy (NIRS), which uses non-invasive photonics in a vaginal speculum to objectively evaluate pelvic floor muscle (PFM) function as it relates to SUI pathology...
June 2017: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/28607132/impaired-muscle-oxygenation-and-elevated-exercise-blood-pressure-in-hypertensive-patients-links-with-vascular-stiffness
#5
Konstantina Dipla, Areti Triantafyllou, Nikolaos Koletsos, Stavros Papadopoulos, Vasileios Sachpekidis, Ioannis S Vrabas, Eugenia Gkaliagkousi, Andreas Zafeiridis, Stella Douma
This study examined in vivo (1) skeletal muscle oxygenation and microvascular function, at rest and during handgrip exercise, and (2) their association with macrovascular function and exercise blood pressure (BP), in newly diagnosed, never-treated patients with hypertension and normotensive individuals. Ninety-one individuals (51 hypertensives and 40 normotensives) underwent office and 24-hour ambulatory BP, arterial stiffness, and central aortic BP assessment, followed by a 5-minute arterial occlusion and a 3-minute submaximal handgrip exercise...
June 12, 2017: Hypertension
https://www.readbyqxmd.com/read/28585358/muscle-microcirculation-alterations-and-relation-to-dipping-status-in-newly-diagnosed-untreated-patients-with-arterial-hypertension-a-pilot-study
#6
Georgios Tzanis, Stavros Dimopoulos, Chris Manetos, Eleni Koroboki, Efstathios Manios, Ioannis Vasileiadis, Nikolaos Zakopoulos, Serafim Nanas
OBJECTIVE: The importance of abnormalities observed in the microcirculation of patients with arterial hypertension (AH) is being increasingly recognized. The authors aimed to evaluate skeletal muscle microcirculation in untreated, newly diagnosed hypertensive patients with Near Infrared Spectroscopy (NIRS), a non-invasive method that evaluates microcirculation. METHODS: We evaluated 34 subjects, 17 patients with AH (13 males, 49±13y, BMI: 26±2 kg/m(2) ) and 17 healthy controls (12 males, 49±15y, BMI: 25±3 kg/m(2) )...
June 5, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28572502/experimental-intermittent-ischemia-augments-exercise-induced-inflammatory-cytokine-production
#7
Daniel D Shill, Kristine R Polley, Thomas Bradley Willingham, Jarrod A Call, Jonathan R Murrow, Kevin K McCully, Nathan T Jenkins
Acute exercise-induced inflammation is implicated in mediating the beneficial adaptations to regular exercise. Evidence suggests that reduced oxygen and/or blood flow to contracting muscle alters cytokine appearance. However, the acute inflammatory responses to hypoxic/ischemic exercise have been documented with inconsistent results and may not accurately reflect the ischemia produced during exercise in patients with ischemic cardiovascular diseases. Therefore, we determined the extent to which local inflammation is involved in the response to ischemic exercise...
June 1, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28571935/dissociation-of-local-and-global-skeletal-muscle-oxygen-transport-metrics-in-type-2-diabetes
#8
P Mason McClatchey, Timothy A Bauer, Judith G Regensteiner, Irene E Schauer, Amy G Huebschmann, Jane E B Reusch
AIMS: Exercise capacity is impaired in type 2 diabetes, and this impairment predicts excess morbidity and mortality. This defect appears to involve excess skeletal muscle deoxygenation, but the underlying mechanisms remain unclear. We hypothesized that reduced blood flow, reduced local recruitment of blood volume/hematocrit, or both contribute to excess skeletal muscle deoxygenation in type 2 diabetes. METHODS: In patients with (n=23) and without (n=18) type 2 diabetes, we recorded maximal reactive hyperemic leg blood flow, peak oxygen utilization during cycling ergometer exercise (VO2peak), and near-infrared spectroscopy-derived measures of exercise-induced changes in skeletal muscle oxygenation and blood volume/hematocrit...
May 14, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28557670/validity-and-reliability-of-the-moxy-oxygen-monitor-during-incremental-cycling-exercise
#9
E M Crum, W J O'Connor, L Van Loo, M Valckx, S R Stannard
INTRODUCTION: The Moxy is a novel, cutaneously placed muscle oxygen monitor which claims to measure local oxygen saturation (SmO2) and total haemoglobin (THb) using near-infrared spectroscopy. If shown to be reliable, its data storage and telemetric capability will be useful for assessing localised O2 usage during field-based exercise. This study investigated the reliability of the Moxy during cycling and assessed the correlations between its measurements, whole-body O2 consumption (VO2) and heart rate (HR)...
May 30, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28555052/blackcurrant-alters-physiological-responses-and-femoral-artery-diameter-during-sustained-isometric-contraction
#10
Matthew David Cook, Stephen David Myers, Mandy Lucinda Gault, Mark Elisabeth Theodorus Willems
Blackcurrant is rich in anthocyanins that may affect exercise-induced physiological responses. We examined tissue oxygen saturation, muscle activity, cardiovascular responses and femoral artery diameter during a submaximal sustained isometric contraction. In a randomised, double-blind, crossover design, healthy men (n = 13, age: 25 ± 4 years, BMI: 25 ± 3 kg·m(-2), mean ± SD) ingested New Zealand blackcurrant (NZBC) extract (600 mg∙day(-1) CurraNZ™) or placebo (PL) for 7-days separated by 14-days washout...
May 29, 2017: Nutrients
https://www.readbyqxmd.com/read/28499979/inspiratory-muscle-training-improves-intercostal-and-forearm-muscle-oxygenation-in-patients-with-chronic-heart-failure-evidence-of-the-origin-of-the-respiratory-metaboreflex
#11
Adalgiza M Moreno, Alessandra C Toledo-Arruda, Jéssica S Lima, Carolina S Duarte, Humberto Vilacortta-Junior, Antonio C L Nóbrega
BACKGROUND: The impact of inspiratory muscle training (IMT) on respiratory and peripheral muscle oxygenation and perfusion during inspiratory muscle fatigue in patients with chronic heart failure has not been established. METHODS AND RESULTS: Twenty-six patients with chronic heart failure were randomly assigned to either 8 weeks of IMT or to a control group. Inspiratory fatigue was induced by a progressive inspiratory resistive loading protocol until there was an inability to sustain inspiratory pressure, when the inspiratory muscle metaboreflex should be activated...
May 9, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/28496411/calf-compression-sleeves-change-biomechanics-but-not-performance-and-physiological-responses-in-trail-running
#12
Hugo A Kerhervé, Pierre Samozino, Fabrice Descombe, Matthieu Pinay, Guillaume Y Millet, Marion Pasqualini, Thomas Rupp
Introduction: The aim of this study was to determine whether calf compression sleeves (CS) affects physiological and biomechanical parameters, exercise performance, and perceived sensations of muscle fatigue, pain and soreness during prolonged (~2 h 30 min) outdoor trail running. Methods: Fourteen healthy trained males took part in a randomized, cross-over study consisting in two identical 24-km trail running sessions (each including one bout of running at constant rate on moderately flat terrain, and one period of all-out running on hilly terrain) wearing either degressive CS (23 ± 2 mmHg) or control sleeves (CON, <4 mmHg)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28488836/effects-of-low-load-resistance-exercise-with-blood-flow-restriction-on-intramuscular-hemodynamics-oxygenation-level-and-water-content
#13
Osamu Yanagisawa, Atsuki Fukutani
BACKGROUND: Muscle metabolism during and after low-load blood flow restriction (BFR) exercise should be further investigated to clarify the mechanism by which the exercise leads to muscle hypertrophy, and increases strength and endurance. We aimed to investigate the effects of low-load resistance exercise with BFR on intramuscular hemodynamics, oxygenation level, and water content. METHODS: Seven men performed ankle plantar flexion exercise (120 repetitions, 30% one repetition maximum) using a custom-made device with and without BFR inside a magnetic resonance scanner...
May 9, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28445231/the-effects-of-multi-day-vs-single-pre-exercise-nitrate-supplement-dosing-on-simulated-cycling-time-trial-performance-and-skeletal-muscle-oxygenation
#14
Edward Jo, Michelle Fischer, Alexandra T Auslander, Alan Beigarten, Bruce Daggy, Ken Hansen, Lisa Kessler, Adam Osmond, Hong Wang, Rachel Wes
A transient augmentation in the metabolic efficiency of skeletal muscle is the purported basis for dietary nitrate supplementation amongst competitive and recreational athletes alike. Previous studies support the ergogenic effects of nitrate supplementation as findings indicated improved microvascular blood flow, exercise economy, and performance with relatively short-term supplementation. As with most ergogenic aids, the optimum duration of supplementation prior to performance or competition, i.e. loading phase, is a critical determinant for efficacy...
April 18, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28414877/accelerated-point-of-muscle-deoxygenation-during-the-20-m-shuttle-run-test
#15
Daisuke Kume, Akira Iguchi, Hiroshi Endoh
This study examined whether the point of accelerated deoxygenation of active muscle occurs during the 20-m shuttle run test (20mSRT) and, if so, whether it is associated with exercise performance in the test. Twenty-nine male subjects performed the 20mSRT, and concentration changes in oxyhaemoglobin (ΔOxy-Hb) and deoxyhaemoglobin (ΔDeoxy-Hb) in the m. vastus lateralis were measured using a portable near-infrared spectroscopy device. The difference between the relative concentration changes in ΔOxy-Hb and ΔDeoxy-Hb (Δ[Oxy-Hb - Deoxy-Hb]) was regarded as the muscle oxygenation index...
April 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28411485/cerebral-and-muscle-microvascular-oxygenation-in-children-with-sickle-cell-disease-influence-of-hematology-hemorheology-and-vasomotion
#16
Keyne Charlot, Sophie Antoine-Jonville, Berenike Moeckesch, Stéphane Jumet, Marc Romana, Xavier Waltz, Lydia Divialle-Doumdo, Marie-Dominique Hardy-Dessources, Marie Petras, Benoît Tressières, Vanessa Tarer, Olivier Hue, Maryse Etienne-Julan, Philippe Connes
The present study investigated cerebral and muscle hemoglobin oxygen saturation (tissue oxygen index, TOI) in children with sickle cell anemia (SS), sickle cell hemoglobin C disease (SC) and healthy children (AA). TOI was measured by near-infrared spectroscopy (NIRS) and spectral analysis of the TOI variability was used to assess flowmotion and vasomotion. Arterial oxyhemoglobin saturation (SpO2), hemorheological and hematological parameters were also measured in SS and SC children. Both TOI were lower in SS compared to both AA and SC children, with SC exhibiting lower values than AA children...
June 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28393459/lunhab-interactive-effects-of-a-10-day-sustained-exposure-to-hypoxia-and-bedrest-on-aerobic-exercise-capacity-in-male-lowlanders
#17
Michail E Keramidas, Igor B Mekjavic, Ola Eiken
The study examined the interactive effects of a 10-day exposure to hypoxia and bedrest on the whole body peak oxygen uptake (V˙O2 peak ) during maximal exercise, and on skeletal-muscle and cerebral oxygenation during submaximal exercise. Nine males underwent three 10-day confinements, in a Latin-square order: (i) a normoxic bedrest [NBR; partial pressure of inspired O2 (PI O2 ) = 134.2 ± 0.7 mmHg], (ii) a hypoxic bedrest (HBR; PI O2  = 102.9 ± 0.1 mmHg at day 1, 91.5 ± 1.2 mmHg at days 3-10), and (iii) a hypoxic ambulation (HAMB; PI O2 as in HBR)...
April 9, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28385920/blood-pressure-and-calf-muscle-oxygen-extraction-during-plantar-flexion-exercise-in-peripheral-artery-disease
#18
J Carter Luck, Amanda J Miller, Faisal Aziz, John F Radtka, David N Proctor, Urs A Leuenberger, Lawrence I Sinoway, Matthew D Muller
Peripheral artery disease (PAD) is an atherosclerotic vascular disease that affects 200 million worldwide. While PAD primarily affects large arteries, it is also associated with microvascular dysfunction, an exaggerated blood pressure (BP) response to exercise, and high cardiovascular mortality. We hypothesized that fatiguing plantar flexion exercise that evokes claudication elicits a greater reduction in skeletal muscle oxygenation (SmO2) and a higher rise in BP in PAD compared to age-matched healthy subjects, but low-intensity steady state plantar flexion elicits similar responses between groups...
April 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28374114/vibration-related-extrusion-of-capillary-blood-from-the-calf-musculature-depends-upon-directions-of-vibration-of-the-leg-and-of-the-gravity-vector
#19
Halil Ibrahim Çakar, Serfiraz Doğan, Sadık Kara, Jörn Rittweger, Rainer Rawer, Jochen Zange
PURPOSE: In this study, we investigated the effects of vibration of the whole lower leg on the content and the oxygenation of hemoglobin in the unloaded relaxed lateral gastrocnemius muscle. Vibration was applied orthogonal to and in parallel with leg axis to examine whether the extrusion of blood depends on an alignment of main vessel direction, axis of vibration and gravity. METHOD: The blood volume in the muscles was altered by horizontal and 30° upright body posture...
April 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28374103/a-validation-method-for-near-infrared-spectroscopy-based-tissue-oximeters-for-cerebral-and-somatic-tissue-oxygen-saturation-measurements
#20
Paul B Benni, David MacLeod, Keita Ikeda, Hung-Mo Lin
We describe the validation methodology for the NIRS based FORE-SIGHT ELITE(®) (CAS Medical Systems, Inc., Branford, CT, USA) tissue oximeter for cerebral and somatic tissue oxygen saturation (StO2) measurements for adult subjects submitted to the United States Food and Drug Administration (FDA) to obtain clearance for clinical use. This validation methodology evolved from a history of NIRS validations in the literature and FDA recommended use of Deming regression and bootstrapping statistical validation methods...
April 3, 2017: Journal of Clinical Monitoring and Computing
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