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https://www.readbyqxmd.com/read/29315165/exercise-thresholds-on-trial-are-they-really-equivalent
#1
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/29214460/blood-flow-restriction-late-in-recovery-after-heavy-resistance-exercise-hampers-muscle-recuperation
#2
Kestutis Bunevicius, Albinas Grunovas, Tomas Venckunas, Kristina Poderiene, Eugenijus Trinkunas, Jonas Poderys
PURPOSE: This study aimed to examine the effect of acute blood flow restriction during the late recovery phase between two resistance exercise bouts on muscular endurance and oxygenation. METHODS: Amateur male middle- and long-distance runners performed two bouts of one-leg dynamic plantar flexion exercise to failure with the load equivalent to 75% of maximum. Subjects were randomly assigned into two experimental groups with thigh occlusion pressure between bouts at either 120 or 200 mmHg with 20 min of passive rest in between, and two control groups without any blood flow restriction separated by either 5 or 20 min of rest...
December 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29190751/acute-effect-of-dietary-nitrate-on-forearm-muscle-oxygenation-blood-volume-and-strength-in-older-adults-a-randomized-clinical-trial
#3
Gustavo Vieira de Oliveira, Marina Morgado, Carlos Adam Conte-Junior, Thiago Silveira Alvares
Both recovery time of post-exercise muscle oxygenation and muscle strength decline with aging. Although beetroot consumption has been shown to improve muscle oxygenation and exercise performance in adults, these effects in the elderly has not been addressed. The aim of the present study was to evaluate the effect of a beetroot-based gel (BG) on muscle O2 saturation, blood volume (tHb) and handgrip strength in the elderly in response to handgrip exercise. In a randomized crossover double-blind design, twelve older subjects consumed BG (100 g of beetroot-based gel containing ~ 12 mmol nitrate) or PLA (100 g of nitrate-depleted gel nitrate-depleted)...
2017: PloS One
https://www.readbyqxmd.com/read/29177977/muscle-oximetry-in-sports-science-a-systematic-review
#4
REVIEW
Stephane Perrey, Marco Ferrari
BACKGROUND: Since the introduction (in 2006) of commercially available portable wireless muscle oximeters, the use of muscle near-infrared spectroscopy (NIRS) technology is gaining in popularity as an application to observe changes in muscle metabolism and muscle oxygenation during and after exercise or training interventions in both laboratory and applied sports settings. OBJECTIVES: The objectives of this systematic review were to highlight the application of muscle oximetry in evaluating oxidative skeletal muscle performance to sport activities and emphasize how this technology has been applied to exercise and training...
November 25, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29163193/changes-in-muscle-and-cerebral-deoxygenation-and-perfusion-during-repeated-sprints-in-hypoxia-to-exhaustion
#5
Sarah J Willis, Laurent Alvarez, Grégoire P Millet, Fabio Borrani
During supramaximal exercise, exacerbated at exhaustion and in hypoxia, the circulatory system is challenged to facilitate oxygen delivery to working tissues through cerebral autoregulation which influences fatigue development and muscle performance. The aim of the study was to evaluate the effects of different levels of normobaric hypoxia on the changes in peripheral and cerebral oxygenation and performance during repeated sprints to exhaustion. Eleven recreationally active participants (six men and five women; 26...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29161235/influence-of-ductus-arteriosus-on-peripheral-muscle-oxygenation-and-perfusion-in-neonates
#6
Lukas Peter Mileder, Tessa Mueller, Nariae Baik-Schneditz, Jasmin Pansy, Bernhard Schwaberger, Corinna Binder-Heschl, Berndt Urlesberger, Gerhard Pichler
In neonates, a patent ductus arteriosus (DA) may be associated with severe complications. We used near-infrared spectroscopy (NIRS) with venous occlusion to investigate the influence of an open DA on peripheral muscle oxygenation/perfusion in preterm neonates. Approach: We analyzed secondary outcome parameters collected as part of prospective observational studies. NIRS measurements were performed between the first and third day of life. Arterial oxygen saturation (SaO2) and heart rate (HR) were monitored by pulse oximetry on the ipsilateral foot...
November 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29140137/v%C3%AC-o2-and-muscle-deoxygenation-kinetics-during-skating-comparison-between-slide-board-and-treadmill-skating
#7
Tatiane Piucco, Rogério Soares, Fernando Diefenthaeler, Guillaume Millet, Juan Murias
PURPOSE: this study aimed to compare the oxygen uptake (V̇O2) kinetics during skating on a treadmill and skating on a slide board and discuss potential mechanisms that might control the V̇O2 kinetics responses during skating. METHODS: breath-by-breath pulmonary V̇O2 and near-infrared spectroscopy-derived muscle deoxygenation ([HHbMb]) were monitored continuously in 12 well-trained young long track speed skaters. On-transient V̇O2 and [HHbMb] responses to skating on a treadmill and skating on a slide board at 80% of the estimated gas exchange threshold were fitted as mono-exponential function...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29114952/age-related-microvascular-dysfunction-novel-insight-from-near-infrared-spectroscopy
#8
Ryan Rosenberry, Madison Munson, Susie Chung, T Jake Samuel, Jordan Patik, Wesley J Tucker, Mark J Haykowsky, Michael D Nelson
Near-infrared spectroscopy (NIRS) has emerged as a promising tool to evaluate vascular reactivity in vivo. Whether this approach can be used to assess age-related impairments in microvascular function has not been tested. Tissue oxygen saturation (StO2 ) post-occlusion recovery kinetics were measured in two distinct age groups (<35 year and >65 years) using NIRS placed over the flexor digitorum profundus. Key end-points included: (1) the desaturation rate during cuff occlusion; (2) the lowest StO2  value obtained during ischemia (StO2min ); (3) StO2  reperfusion rate; (4) the highest StO2  value reached after cuff release (StO2max ); and (5) the reactive hyperemia area under the curve (AUC)...
November 7, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29059243/muscle-oxygenation-in-type-1-diabetic-and-non-diabetic-patients-with-and-without-chronic-compartment-syndrome
#9
Patrik Gustafsson, Albert G Crenshaw, David Edmundsson, Göran Toolanen, Sead Crnalic
BACKGROUND: Type 1 diabetic patients and non-diabetic patients were referred for evaluation for chronic exertional compartment syndrome (CECS) based on clinical examination and complaints of activity-related leg pain in the region of the tibialis anterior muscle. Previous studies using near-infrared spectroscopy (NIRS) showed greater deoxygenation during exercise for CECS patients versus healthy controls; however, this comparison has not been done for diabetic CECS patients. METHODS: We used NIRS to test for differences in oxygenation kinetics for Type 1 diabetic patients diagnosed with (CECS-diabetics, n = 9) versus diabetic patients without (CON-diabetics, n = 10) leg anterior chronic exertional compartment syndrome...
2017: PloS One
https://www.readbyqxmd.com/read/29038351/differences-in-oxidative-metabolism-modulation-induced-by-ischemia-reperfusion-between-trained-and-untrained-individuals-assessed-by-nirs
#10
Rogério N Soares, Kaitlin M McLay, Mitchell A George, Juan M Murias
Endurance training is associated with skeletal muscle adaptations that regulate the oxidative metabolism during ischemia/reperfusion. The aim of this study was to noninvasively assess in vivo differences in the oxidative metabolism activity during ischemia/reperfusion between trained and untrained individuals, using near infrared spectroscopy (NIRS) combined with a vascular occlusion test (VOT) technique (NIRS-VOT). Sixteen untrained (26.3 ± 5.1 year) and seventeen trained (29.4 ± 4.9 year) healthy young adult men were submitted to a VOT (2 min baseline, 5 min occlusion, and 8 min reperfusion)...
October 2017: Physiological Reports
https://www.readbyqxmd.com/read/29034529/reliability-of-muscle-blood-flow-and-oxygen-consumption-response-from-exercise-using-near-infrared-spectroscopy
#11
Adam A Lucero, Gifty Addae, Wayne Lawrence, Beemnet Neway, Daniel P Credeur, James Faulkner, David Rowlands, Lee Stoner
Near-infrared spectroscopy (NIRS), coupled with rapid venous (VO) and arterial occlusions (AO) can be used to non-invasively estimate resting local skeletal muscle blood flow (mBF) and oxygen consumption (mV̇O2 ), respectively. However, the day-to-day reliability of mBF and mV̇O2 responses to stressors such as incremental dynamic exercise has not been established. PURPOSE: To determine the reliability of NIRS derived mBF and mV̇O2 response from incremental dynamic exercise. METHODS: Measurements of mBF and mV̇O2 were collected in the vastus lateralis of twelve healthy, physically active adults [7 m and 5 f; 25 y (SD 6)] over 3 non-consecutive visits within 10 days...
October 16, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29026684/combined-multi-distance-frequency-domain-and-diffuse-correlation-spectroscopy-system-with-simultaneous-data-acquisition-and-real-time-analysis
#12
Stefan A Carp, Parisa Farzam, Norin Redes, Dennis M Hueber, Maria Angela Franceschini
Frequency domain near infrared spectroscopy (FD-NIRS) and diffuse correlation spectroscopy (DCS) have emerged as synergistic techniques for the non-invasive assessment of tissue health. Combining FD-NIRS oximetry with DCS measures of blood flow, the tissue oxygen metabolic rate can be quantified, a parameter more closely linked to underlying physiology and pathology than either NIRS or DCS estimates alone. Here we describe the first commercially available integrated instrument, called the "MetaOx", designed to enable simultaneous FD-NIRS and DCS measurements at rates of 10 + Hz, and offering real-time data evaluation...
September 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28990205/developing-a-protocol-for-normothermic-ex-situ-limb-perfusion
#13
Eliana F R Duraes, Maria Madajka, Russell Frautschi, Basem Soliman, Cagri Cakmakoglu, Addison Barnett, Kashyap Tadisina, Qiang Liu, Patrick Grady, Cristiano Quintini, Toshihiro Okamoto, Francis Papay, Antonio Rampazzo, Bahar Bassiri Gharb
BACKGROUND: Ischemia time represents a significant limitation for successful extremity transplantation because of the rapid deterioration of ischemic muscle. Normothermic ex-situ preservation is an emergent method to prolong the organ viability following procurement, by replicating the physiologic conditions. The aim of this study was to develop an ex-situ normothermic limb perfusion system to preserve the viability and function of porcine limbs for 12 hours following procurement. METHODS: A total of 18 swine limbs were perfused...
October 9, 2017: Microsurgery
https://www.readbyqxmd.com/read/28982943/effects-of-exercise-training-on-calf-muscle-oxygen-extraction-and-blood-flow-in-patients-with-peripheral-artery-disease
#14
Wesley B Baker, Zhe Li, Steven S Schenkel, Malavika Chandra, David R Busch, Erin Kristine Englund, Kathryn H Schmitz, Arjun G Yodh, Thomas F Floyd, Emile R Mohler
We employed near-infrared optical techniques, diffuse correlation spectroscopy (DCS) and frequency-domain near-infrared spectroscopy (FD-NIRS), to test the hypothesis that supervised exercise training increases skeletal muscle microvascular blood flow and oxygen extraction in patients with peripheral artery disease (PAD) who experience claudication. PAD patients (n=64) were randomly assigned to exercise and control groups. Patients in the exercise group received three months of supervised exercise training...
October 5, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28977120/a-practical-approach-to-assess-leg-muscle-oxygenation-during-ramp-incremental-cycle-ergometry-in-heart-failure
#15
A C Barroco, P A Sperandio, M Reis, D R Almeida, J A Neder
Heart failure is characterized by the inability of the cardiovascular system to maintain oxygen (O2) delivery (i.e., muscle blood flow in non-hypoxemic patients) to meet O2 demands. The resulting increase in fractional O2 extraction can be non-invasively tracked by deoxygenated hemoglobin concentration (deoxi-Hb) as measured by near-infrared spectroscopy (NIRS). We aimed to establish a simplified approach to extract deoxi-Hb-based indices of impaired muscle O2 delivery during rapidly-incrementing exercise in heart failure...
October 2, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28974486/combined-dietary-nitrate-and-exercise-intervention-in-peripheral-artery-disease-protocol-rationale-and-design
#16
Mary N Woessner, Mitch D VanBruggen, Carl F Pieper, Erin K O'Reilly, William E Kraus, Jason D Allen
BACKGROUND: Peripheral artery disease (PAD) is caused by atherosclerotic occlusions in the legs. It affects approximately 8-12 million people in the United States alone, one-third of whom suffer from intermittent claudication (IC), defined as ischemic leg pain that occurs with walking and improves with rest. Patients with IC suffer a markedly impaired quality of life and a high perception of disability. Improving pain-free walking time is a primary goal of rehabilitation in this population...
October 3, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28966580/the-temporal-muscle-of-the-head-can-cause-artifacts-in-optical-imaging-studies-with-functional-near-infrared-spectroscopy
#17
Martin Schecklmann, Alexander Mann, Berthold Langguth, Ann-Christine Ehlis, Andreas J Fallgatter, Florian B Haeussinger
Background: Extracranial signals are the main source of noise in functional near-infrared spectroscopy (fNIRS) as light is penetrating the cortex but also skin and muscles of the head. Aim: Here we performed three experiments to investigate the contamination of fNIRS measurements by temporal muscle activity. Material and methods: For experiment 1, we provoked temporal muscle activity by instructing 31 healthy subjects to clench their teeth three times. We measured fNIRS signals over left temporal and frontal channels with an interoptode distance of 3 cm, in one short optode distance (SOD) channel (1 cm) and electromyography (EMG) over the edge of the temporal muscle...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28959210/in-vivo-assessment-of-mitochondrial-dysfunction-in-clinical-populations-using-near-infrared-spectroscopy
#18
REVIEW
T Bradley Willingham, Kevin K McCully
The ability to sustain submaximal exercise is largely dependent on the oxidative capacity of mitochondria within skeletal muscle, and impairments in oxidative metabolism have been implicated in many neurologic and cardiovascular pathologies. Here we review studies which have demonstrated the utility of Near-infrared spectroscopy (NIRS) as a method of evaluating of skeletal muscle mitochondrial dysfunction in clinical human populations. NIRS has been previously used to noninvasively measure tissue oxygen saturation, but recent studies have demonstrated the utility of NIRS as a method of evaluating skeletal muscle oxidative capacity using post-exercise recovery kinetics of oxygen metabolism...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28959158/effects-of-a-pre-workout-supplement-on-hyperemia-following-leg-extension-resistance-exercise-to-failure-with-different-resistance-loads
#19
Jeffrey S Martin, Petey W Mumford, Cody T Haun, Micheal J Luera, Tyler W D Muddle, Ryan J Colquhoun, Mary P Feeney, Cameron S Mackey, Paul A Roberson, Kaelin C Young, David D Pascoe, Jason M DeFreitas, Nathaniel D M Jenkins, Michael D Roberts
BACKGROUND: We sought to determine if a pre-workout supplement (PWS), containing multiple ingredients thought to enhance blood flow, increases hyperemia associated with resistance training compared to placebo (PBO). Given the potential interaction with training loads/time-under-tension, we evaluated the hyperemic response at two different loads to failure. METHODS: Thirty males participated in this double-blinded study. At visit 1, participants were randomly assigned to consume PWS (Reckless™) or PBO (maltodextrin and glycine) and performed four sets of leg extensions to failure at 30% or 80% of their 1-RM 45-min thereafter...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28954987/tissue-oxygenation-index-reflects-changes-in-forearm-blood-flow-after-brief-ischemia
#20
Hiroyuki Kinoshita, Takahiko Akahori, Emi Nakamura, Hazuki Okawa, Shinji Kawahito, Hiroshi Kitahata, Yoshihiro Fujiwara
Whether the near-infrared spectroscopy (NIRS) technology correctly detects the changes in oxygenation related to ischemia and reperfusion of organs and tissues other than brain remains unclear. The present study examined how different tissue oxygenation parameters derived from NIRS reflect the changes in the forearm blood flow (FBF) according to the brief ischemia and the subsequent reperfusion, and whether values of these parameters move in parallel with the medial and lateral sides of FBF. Thirteen volunteers underwent the prospective observational study...
2017: Journal of Medical Investigation: JMI
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