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near infrared spectroscopy muscle oxygen

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https://www.readbyqxmd.com/read/29745773/muscle-oxygenation-rather-than-vo-2-max-is-a-strong-predictor-of-performance-in-sprint-canoe-kayak
#1
Myriam Paquette, François Bieuzen, François Billaut
PURPOSE: This study aimed to characterize the relationships between muscle oxygenation and performance during on- and off-water tests in highly trained sprint canoe-kayak athletes. METHODS: Thirty athletes (19 kayakers and 11 canoeists) performed a maximal incremental test on a canoe or kayak ergometer for determination of VO2max and examination of the relation between peak power output (PPO) and physiological parameters. A subset of 21 athletes also performed a 200-m and a 500-m (for women) or 1000-m (for men) on-water time trials...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29745735/time-trial-performance-in-elite-speed-skaters-after-remote-ischemic-preconditioning
#2
Philippe Richard, François Billaut
PURPOSE: Speed skating leads to blood-flow restriction and deoxygenation in the lower limbs (especially the right leg) that may affect performance. Although the acute influence of such deoxygenation is not clearly understood, we tested whether remote ischemic preconditioning (RIPC) could modify muscular oxygenation and improve time-trial performance in that sport. METHODS: Using a randomized, single-blind, placebo-controlled, crossover design, 9 elite speed skaters performed 1000-m on-ice time-trials preceded by either RIPC of the upper limbs (3x5-min compression/5-min reperfusion cycles at 30 mmHg > arterial systolic pressure) or SHAM (10 mmHg)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29722622/blood-flow-occlusion-related-o-2-extraction-reserve-is-present-in-different-muscles-of-the-quadriceps-but-greater-in-deeper-regions-after-ramp-incremental-test
#3
Danilo Iannetta, Dai Okushima, Erin Calaine Inglis, Narihiko Kondo, Juan M Murias, Shunsaku Koga
It was recently demonstrated that an O2 extraction reserve, as assessed by the near-infrared spectroscopy (NIRS)-derived deoxygenation signal ([HHb]), exists in the superficial region of vastus lateralis (VL) muscle during an occlusion performed at the end of a ramp-incremental test. However, it is unknown whether this reserve is present and/or different in magnitude in other portions and depths of the quadriceps muscles. We tested the hypothesis that O2 extraction would exist in other regions of this muscle but greater in deep compared to more superficial portions...
May 3, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29721510/evaluation-of-skeletal-muscle-function-and-effects-of-early-rehabilitation-during-acute-heart-failure-rationale-and-study-design
#4
Kinga Węgrzynowska-Teodorczyk, Agnieszka Siennicka, Krystian Josiak, Robert Zymliński, Monika Kasztura, Waldemar Banasiak, Piotr Ponikowski, Marek Woźniewski
Background: Acute heart failure (AHF) is associated with disturbances of the peripheral perfusion leading to the dysfunction of many organs. Consequently, an episode of AHF constitutes a "multiple organ failure" which may also affect the skeletal muscles. However, the abnormalities within skeletal muscles during AHF have not been investigated so far. The aim of this project is to comprehensively evaluate skeletal muscles (at a functional and tissue level) during AHF. Methods: The study will include ≥63 consecutive AHF patients who will be randomized into 2 groups: ≥42 with cardiac rehabilitation group versus ≥21 with standard pharmacotherapy alone...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29704398/the-effect-of-ipc-on-central-and-peripheral-fatiguing-mechanisms-in-humans-following-sustained-maximal-isometric-exercise
#5
Samuel L Halley, Paul Marshall, Jason C Siegler
NEW FINDINGS: What is the central question of this study? Does ischemic preconditioning (IPC) influence central and peripheral fatiguing mechanisms during sustained maximal isometric exercise? What is the main finding and its importance? Voluntary activation and pre- to post-exercise reductions in resting twitch torque values were unchanged by IPC. However, an effect on tissue oxygenation was observed within the IPC trials where greater concentrations of deoxyhaemoglobin were recorded with concurrent upward trends of total haemoglobin concentrations...
April 28, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29692951/underwater-near-infrared-spectroscopy-can-measure-training-adaptations-in-adolescent-swimmers
#6
Ben Jones, Dave Parry, Chris E Cooper
The development of an underwater near-infrared spectroscopy (uNIRS) device has enabled previously unattainable measurements of peripheral muscle hemodynamics and oxygenation to be taken within the natural aquatic environment. The purposes of this study were (i) to trial the use of uNIRS, in a real world training study, and (ii) to monitor the effects of a swim training program upon muscle oxygenation status in short distance swimming. A total of 14 junior club level swimmers completed a repeated swim sprint test before and after an eight week endurance training program...
2018: PeerJ
https://www.readbyqxmd.com/read/29665297/esmolol-acutely-alters-oxygen-supply-demand-balance-in-exercising-muscles-of-healthy-humans
#7
David N Proctor, J Carter Luck, Stephan R Maman, Urs A Leuenberger, Matthew D Muller
Beta-adrenoreceptor antagonists (β blockers) reduce systemic O2 delivery and blood pressure (BP) during exercise, but the subsequent effects on O2 extraction within the active limb muscles are unknown. In this study, we examined the effects of the fast-acting, β1 selective blocker esmolol on systemic hemodynamics and leg muscle O2 saturation (near infrared spectroscopy, NIRS) during submaximal leg ergometry. Our main hypothesis was that esmolol would augment exercise-induced reductions in leg muscle O2 saturation...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29611324/validation-of-a-novel-wearable-wireless-technology-to-estimate-oxygen-levels-and-lactate-threshold-power-in-the-exercising-muscle
#8
Parisa Farzam, Zack Starkweather, Maria A Franceschini
There is a growing interest in monitoring muscle oxygen saturation (SmO2 ), which is a localized measure of muscle oxidative metabolism and can be acquired continuously and noninvasively using near-infrared spectroscopy (NIRS) methods. Most NIRS systems are cumbersome, expensive, fiber coupled devices, with use limited to lab settings. A novel, low cost, wireless, wearable has been developed for use in athletic training. In this study, we evaluate the advantages and limitations of this new simple continuous-wave (CW) NIRS device with respect to a benchtop, frequency-domain near-infrared spectroscopy (FDNIRS) system...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29560041/muscle-specific-endurance-of-the-trapezius-muscles-using-electrical-twitch-mechanomyography
#9
Kevin K McCully, Payton Prins, Kajal Mistry, T Bradley Willingham
Background: Symptoms of fatigue and pain are often reported for the trapezius muscle in the shoulder. The present study evaluated endurance in the trapezius muscles of healthy participants using electric twitch mechanomyography (ETM). Methods: Surface electrodes and a tri-axial accelerometer were placed over the left trapezius muscle. Muscles were stimulated for 3 min each at 2 Hz, 4 Hz and 6 Hz. Maintenance of acceleration during muscle twitches was used to calculate an endurance index (EI)...
April 2018: Shoulder & Elbow
https://www.readbyqxmd.com/read/29555789/targeting-skeletal-muscle-tissue-oxygenation-sto-2-in-adults-with-severe-sepsis-and-septic-shock-a-randomised-controlled-trial-oto-sts-study
#10
Olivier Nardi, Elizabeth Zavala, Claude Martin, Serafim Nanas, Thomas Scheeren, Andrea Polito, Xavi Borrat, Djillali Annane
OBJECTIVE: Evaluation of the ratio of oxyhaemoglobin to total haemoglobin in skeletal muscle (StO2 ) using near-infrared spectroscopy may aid in the monitoring of patients with sepsis. This study assessed the benefits and risks of targeting StO2 in adults with severe sepsis or septic shock. DESIGN: A European randomised controlled trial was performed on two parallel groups. SETTING: Five intensive care units (ICU) in France, Greece, Spain and Germany were used for the study...
March 19, 2018: BMJ Open
https://www.readbyqxmd.com/read/29553570/skeletal-muscle-neurovascular-coupling-oxidative-capacity-and-microvascular-function-with-one-stop-shop-near-infrared-spectroscopy
#11
Ryan Rosenberry, Susie Chung, Michael D Nelson
Exercise represents a major hemodynamic stress that demands a highly coordinated neurovascular response in order to match oxygen delivery to metabolic demand. Reactive hyperemia (in response to a brief period of tissue ischemia) is an independent predictor of cardiovascular events and provides important insight into vascular health and vasodilatory capacity. Skeletal muscle oxidative capacity is equally important in health and disease, as it determines the energy supply for myocellular processes. Here, we describe a simple, non-invasive approach using near-infrared spectroscopy to assess each of these major clinical endpoints (reactive hyperemia, neurovascular coupling, and muscle oxidative capacity) during a single clinic or laboratory visit...
February 20, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29544385/decrease-of-muscle-strength-in-vascular-access-hand-due-to-silent-ischaemia
#12
Tereza Kmentova, Anna Valerianova, Lucie Kovarova, Jana Lachmanova, Zuzana Hladinova, Jan Malik
BACKGROUND: Creation of vascular access leads to considerable local haemodynamic changes with decreased hand perfusion. Distal limb tissues then represent a model of hand ischaemia effect on muscles. The aim of our study was to investigate how the presence of vascular access influences the hand muscle strength in end-stage renal disease patients. METHODS: We included 52 chronically haemodialysed patients with upper limb access without clinical signs of hand ischaemia...
March 1, 2018: Journal of Vascular Access
https://www.readbyqxmd.com/read/29543135/one-week-cf-intake-increases-prefrontal-cortex-oxygenation-at-rest-and-during-moderate-intensity-exercise-in-normoxia-and-hypoxia
#13
Lieselot Decroix, Cajsa Tonoli, Elodie Lespagnol, Constantino Balestra, Amandine Descat, Marie Jose Drittij-Reijnders, Jamie R Blackwell, Wilhelm Stahl, Andrew M Jones, Antje R Weseler, Aalt Bast, Romain Meeusen, Elsa Heyman
INTRODUCTION: During exercise in hypoxia, O2 delivery to brain and muscle is compromised and oxidative stress is elicited. Cocoa flavanols (CF) have antioxidant capacities and can increase blood flow by stimulating endothelial function. We aimed to examine the effects of 7-day CF intake on oxidative stress, nitric oxide production and tissue oxygenation in response to exercise in hypoxia (14.3% O2 ). METHODS: In a randomized, double blind, cross-over study, 14 well-trained male cyclists completed 4 trials: exercise in normoxia or hypoxia, after 7-day CF or placebo intake...
March 15, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29528955/effects-of-small-sided-games-and-high-intensity-interval-training-on-aerobic-and-repeated-sprint-performance-and-peripheral-muscle-oxygenation-changes-in-elite-junior-basketball-players
#14
A Delextrat, M Gruet, F Bieuzen
The aim of the current study was to compare the effects of 6 weeks of small-sided game (SSG) and high-intensity interval training (HIIT) on aerobic fitness and muscle oxygenation during a repeated sprint (RS) sequence in elite male junior basketball players. Twenty participants (14.3 ± 0.5 years; 176.8 ± 12.5 cm; 74.5 ± 9.8 kg) performed pre- and post-tests interspersed by 6-weeks of SSG or HIIT training. Testing sessions consisted of the 30-15 Intermittent Fitness Test and a RS sequence (two bouts of 15-s)...
March 6, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29501244/systemic-vascular-dysfunction-is-associated-with-emphysema-burden-in-mild-copd
#15
Joel T Zelt, Joshua H Jones, Daniel M Hirai, Trevor J King, Danilo C Berton, Kyra E Pyke, Denis E O'Donnell, J Alberto Neder
BACKGROUND: Cardiovascular diseases play a major role in morbidity and mortality in the earlier stages of COPD. We hypothesized that systemic vascular dysfunction would be present even in patients who are currently considered at "low-risk" for negative cardiovascular outcomes, i.e., those with largely preserved FEV1 , few exacerbations and only mild burden of respiratory symptoms (GOLD spirometric grade 1, clinical group A). METHODS: 16 patients (FEV1  = 86 ± 13%) and 16 age- and gender-matched controls underwent measurements of: a) central arterial stiffness by pulse wave velocity, b) brachial flow-mediated dilation and c) forearm muscle oxygenation by near-infrared spectroscopy...
March 2018: Respiratory Medicine
https://www.readbyqxmd.com/read/29425473/beetroot-increases-muscle-performance-and-oxygenation-during-sustained-isometric-exercise-but-does-not-alter-muscle-oxidative-efficiency-and-microvascular-reactivity-at-rest
#16
Stavros Papadopoulos, Konstantina Dipla, Areti Triantafyllou, Michalis G Nikolaidis, Antonios Kyparos, Panagiota Touplikioti, Ioannis S Vrabas, Andreas Zafeiridis
OBJECTIVE: To examine the effects of beetroot juice (BRJ) on (i) in vivo skeletal muscle O2 consumption (mVO2 ) and microvascular reactivity at rest and (ii) muscle performance, muscle oxygenation, and mVO2 during sustained isometric handgrip exercise (IHG). METHODS: Sixteen young males consumed, randomly, a nitrate-rich (8.1 mmol BRJnitrate) or nitrate-depleted (BRJplacebo) BRJ. After 2.5 hours, they performed an occlusion-reperfusion maneuver at rest, a 3-minute sustained IHG, and a sustained IHG to exhaustion with arterial occlusion...
February 9, 2018: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/29425103/approaches-for-calibration-and-validation-of-near-infrared-optical-methods-for-oxygenation-monitoring
#17
REVIEW
Christoph Hornberger, Heidrun Wabnitz
Pulse oximetry for arterial oxygenation monitoring and tissue oximetry for monitoring of cerebral oxygenation or muscle oxygenation are based on quantitative in vivo diffuse optical spectroscopy. However, in both cases the information on absolute or relative concentration of human tissue constituents and especially on hemoglobin oxygenation can often not be retrieved by model-based analysis. An in vivo calibration against an accepted reference measurement can be a practical alternative. Pulse oximeters and most of commercial cerebral tissue oximeters rely on empirical calibration based on invasive controlled human desaturation studies...
February 9, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29423544/high-intensity-interval-training-in-hypoxia-does-not-affect-muscle-hif-responses-to-acute-hypoxia-in-humans
#18
Stefan De Smet, Gommaar D'Hulst, Chiel Poffé, Ruud Van Thienen, Emanuele Berardi, Peter Hespel
PURPOSE: The myocellular response to hypoxia is primarily regulated by hypoxia-inducible factors (HIFs). HIFs thus conceivably are implicated in muscular adaptation to altitude training. Therefore, we investigated the effect of hypoxic versus normoxic training during a period of prolonged hypoxia ('living high') on muscle HIF activation during acute ischaemia. METHODS: Ten young male volunteers lived in normobaric hypoxia for 5 weeks (5 days per week, ~ 15.5 h per day, Fi O2 : 16...
April 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29411535/near-infrared-spectroscopy-detects-age-related-differences-in-skeletal-muscle-oxidative-function-promising-implications-for-geroscience
#19
Susie Chung, Ryan Rosenberry, Terence E Ryan, Madison Munson, Thomas Dombrowsky, Suwon Park, Aida Nasirian, Mark J Haykowsky, Michael D Nelson
Age is the greatest risk factor for chronic disease and is associated with a marked decline in functional capacity and quality of life. A key factor contributing to loss of function in older adults is the decline in skeletal muscle function. While the exact mechanism(s) remains incompletely understood, age-related mitochondrial dysfunction is thought to play a major role. To explore this question further, we studied 15 independently living seniors (age: 72 ± 5 years; m/f: 4/11; BMI: 27.6 ± 5.9) and 17 young volunteers (age: 25 ± 4 years; m/f: 8/9; BMI: 24...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29389835/effects-of-acute-salbutamol-intake-on-peripheral-and-central-fatigue-in-trained-men
#20
Julien Laurent, Michel Guinot, Thibault Le Roux Mallouf, Mathieu Marillier, Julie Larribaut, Samuel Verges
PURPOSE: Ergogenic effect in physically active subjects has been reported following acute salbutamol (SAL) intake. β2-agonists have potential stimulant effects within the central nervous system that could be involved in this ergogenic effect. We hypothesized that acute SAL intake would induce changes in cerebral responses during exercise, with significant improvement in cerebral oxygenation and voluntary activation (VA) contributing to an increase in muscle performance. METHODS: Fourteen trained male subjects (25 ± 5 years) performed repeated isometric knee extensions until task failure (TF) following 4 mg (oral) SAL, 800 μg (inhaled) SAL, or placebo intake...
January 31, 2018: Medicine and Science in Sports and Exercise
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