Готові списки джерел за темами / Muscle deoxygenating

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Автор: Grafiati
Опубліковано: 1 червня 2024

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Статті в журналах з теми "Muscle deoxygenating":

1

Lusina, Sarah-Jane C., Darren E. R. Warburton, Nicola G. Hatfield, and A. William Sheel. "Muscle deoxygenation of upper-limb muscles during progressive arm-cranking exercise." Applied Physiology, Nutrition, and Metabolism 33, no. 2 (April 2008): 231–38. http://dx.doi.org/10.1139/h07-156.

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The purpose of this study was to determine which upper-limb muscle exhibits the greatest change in muscle deoxygenation during arm-cranking exercise (ACE). We hypothesized that the biceps brachii (BB) would show the greatest change in muscle deoxygenation during progressive ACE to exhaustion relative to triceps brachii (TR), brachioradialis (BR), and anterior deltoid (AD). Healthy young men (n = 11; age = 27 ± 1 y; mean ± SEM) performed an incremental ACE test to exhaustion. Near-infrared spectroscopy (NIRS) was used to monitor the relative concentration changes in oxy- (O2Hb), deoxy- (HHb), and total hemoglobin (Hbtot), as well as tissue oxygenation index (TOI) in each of the 4 muscles. During submaximal arm exercise, we found that changes to NIRS-derived measurements were not different between the 4 muscles studied (p > 0.05). At maximal exercise HHb was significantly higher in the BB compared with AD (p < 0.05). Relative to the other 3 muscles, BB exhibited the greatest decrease in O2Hb and TOI (p < 0.05). Our investigation provides two new and important findings: (i) during submaximal ACE the BB, TR, BR, and AD exhibit similar changes in muscle deoxygenation and (ii) during maximal ACE the BB exhibits the greatest change in intramuscular O2 status.
2

Chin, Lisa M. K., John M. Kowalchuk, Thomas J. Barstow, Narihiko Kondo, Tatsuro Amano, Tomoyuki Shiojiri, and Shunsaku Koga. "The relationship between muscle deoxygenation and activation in different muscles of the quadriceps during cycle ramp exercise." Journal of Applied Physiology 111, no. 5 (November 2011): 1259–65. http://dx.doi.org/10.1152/japplphysiol.01216.2010.

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The relationship between muscle deoxygenation and activation was examined in three different muscles of the quadriceps during cycling ramp exercise. Seven young male adults (24 ± 3 yr; mean ± SD) pedaled at 60 rpm to exhaustion, with a work rate (WR) increase of 20 W/min. Pulmonary oxygen uptake was measured breath-by-breath, while muscle deoxygenation (HHb) and activity were measured by time-resolved near-infrared spectroscopy (NIRS) and surface electromyography (EMG), respectively, at the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM). Muscle deoxygenation was corrected for adipose tissue thickness and normalized to the amplitude of the HHb response, while EMG signals were integrated (iEMG) and normalized to the maximum iEMG determined from maximal voluntary contractions. Muscle deoxygenation and activation were then plotted as a percentage of maximal work rate (%WRmax). The HHb response for all three muscle groups was fitted by a sigmoid function, which was determined as the best fitting model. The c/d parameter for the sigmoid fit (representing the %WRmax at 50% of the total amplitude of the HHb response) was similar between VL (47 ± 12% WRmax) and VM (43 ± 11% WRmax), yet greater ( P < 0.05) for RF (65 ± 13% WRmax), demonstrating a “right shift” of the HHb response compared with VL and VM. The iEMG also showed that muscle activation of the RF muscle was lower ( P < 0.05) compared with VL and VM throughout the majority of the ramp exercise, which may explain the different HHb response in RF. Therefore, these data suggest that the sigmoid function can be used to model the HHb response in different muscles of the quadriceps; however, simultaneous measures of muscle activation are also needed for the HHb response to be properly interpreted during cycle ramp exercise.
3

Anthierens, Agathe, Nicolas Olivier, André Thevenon, and Patrick Mucci. "Trunk Muscle Aerobic Metabolism Responses in Endurance Athletes, Combat Athletes and Untrained Men." International Journal of Sports Medicine 40, no. 07 (June 12, 2019): 434–39. http://dx.doi.org/10.1055/a-0856-7207.

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AbstractThis study investigated aerobic metabolism responses in trunk muscles during a prolonged trunk extension exercise in athletes and untrained young men. The aim was to analyze the adaptations induced by 2 types of sports: one involving intensive use of trunk muscles (i. e., judo), and one known to induce high aerobic capacity in the whole body (i. e., cycling). Eleven judokas, 10 cyclists and 9 healthy untrained young men performed trunk extension exercises on an isokinetic dynamometer. During the first session, muscle strength was assessed during maximal trunk extension. During a second session, a 5-min exercise was performed to investigate aerobic responses with regard to trunk muscles. The near infrared spectroscopy technique and a gas exchange analyzer were used continuously to evaluate mechanical efficiency, V̇O2 on-set kinetics, trunk muscle deoxygenation and blood volume. Judokas showed greater trunk strength and mechanical efficiency (p<0.05). Cyclists presented faster V̇O2 on-set kinetics (p<0.05) and greater muscle deoxygenation and blood volume compared to untrained men (p<0.001). These results suggest that practicing judo improves trunk extension efficiency whereas cycling accelerates aerobic pathways and enhances microvascular responses to trunk extension exercise. Sport practice improves aerobic metabolism responses in trunk extensor muscles differently, according to the training specificities.
4

Goulding, Richie P., Dai Okushima, Simon Marwood, David C. Poole, Thomas J. Barstow, Tze-Huan Lei, Narihiko Kondo, and Shunsaku Koga. "Impact of supine exercise on muscle deoxygenation kinetics heterogeneity: mechanistic insights into slow pulmonary oxygen uptake dynamics." Journal of Applied Physiology 129, no. 3 (September 1, 2020): 535–46. http://dx.doi.org/10.1152/japplphysiol.00213.2020.

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We show that supine exercise causes a greater degree of muscle deoxygenation in both deep and superficial muscle and increases the spatial heterogeneity of muscle deoxygenation. Therefore, this study suggests that any O2 delivery gradient toward deep versus superficial muscle is insufficient to mitigate impairments in oxidative function in response to reduced whole muscle O2 delivery. More heterogeneous muscle deoxygenation is associated with slower V̇o2 kinetics.
5

Koga, Shunsaku, Yutaka Kano, Thomas J. Barstow, Leonardo F. Ferreira, Etsuko Ohmae, Mizuki Sudo, and David C. Poole. "Kinetics of muscle deoxygenation and microvascular Po2 during contractions in rat: comparison of optical spectroscopy and phosphorescence-quenching techniques." Journal of Applied Physiology 112, no. 1 (January 1, 2012): 26–32. http://dx.doi.org/10.1152/japplphysiol.00925.2011.

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The overarching presumption with near-infrared spectroscopy measurement of muscle deoxygenation is that the signal reflects predominantly the intramuscular microcirculatory compartment rather than intramyocyte myoglobin (Mb). To test this hypothesis, we compared the kinetics profile of muscle deoxygenation using visible light spectroscopy (suitable for the superficial fiber layers) with that for microvascular O2 partial pressure (i.e., PmvO2, phosphorescence quenching) within the same muscle region (0.5∼1 mm depth) during transitions from rest to electrically stimulated contractions in the gastrocnemius of male Wistar rats ( n = 14). Both responses could be modeled by a time delay (TD), followed by a close-to-exponential change to the new steady level. However, the TD for the muscle deoxygenation profile was significantly longer compared with that for the phosphorescence-quenching PmvO2 [8.6 ± 1.4 and 2.7 ± 0.6 s (means ± SE) for the deoxygenation and PmvO2, respectively; P < 0.05]. The time constants (τ) of the responses were not different (8.8 ± 4.7 and 11.2 ± 1.8 s for the deoxygenation and PmvO2, respectively). These disparate (TD) responses suggest that the deoxygenation characteristics of Mb extend the TD, thereby increasing the duration (number of contractions) before the onset of muscle deoxygenation. However, this effect was insufficient to increase the mean response time. Somewhat differently, the muscle deoxygenation response measured using near-infrared spectroscopy in the deeper regions (∼5 mm depth) (∼50% type I Mb-rich, highly oxidative fibers) was slower (τ = 42.3 ± 6.6 s; P < 0.05) than the corresponding value for superficial muscle measured using visible light spectroscopy or PmvO2 and can be explained on the basis of known fiber-type differences in PmvO2 kinetics. These data suggest that, within the superficial and also deeper muscle regions, the τ of the deoxygenation signal may represent a useful index of local O2 extraction kinetics during exercise transients.
6

Okushima, Dai, David C. Poole, Harry B. Rossiter, Thomas J. Barstow, Narihiko Kondo, Etsuko Ohmae, and Shunsaku Koga. "Muscle deoxygenation in the quadriceps during ramp incremental cycling: Deep vs. superficial heterogeneity." Journal of Applied Physiology 119, no. 11 (December 1, 2015): 1313–19. http://dx.doi.org/10.1152/japplphysiol.00574.2015.

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Muscle deoxygenation (i.e., deoxy[Hb + Mb]) during exercise assesses the matching of oxygen delivery (Q̇o2) to oxygen utilization (V̇o2). Until now limitations in near-infrared spectroscopy (NIRS) technology did not permit discrimination of deoxy[Hb + Mb] between superficial and deep muscles. In humans, the deep quadriceps is more highly vascularized and oxidative than the superficial quadriceps. Using high-power time-resolved NIRS, we tested the hypothesis that deoxygenation of the deep quadriceps would be less than in superficial muscle during incremental cycling exercise in eight males. Pulmonary V̇o2 was measured and muscle deoxy[Hb + Mb] was determined in the superficial vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF-s) and the deep rectus femoris (RF-d). deoxy[Hb + Mb] in RF-d was significantly less than VL at 70% (67.2 ± 7.0 vs. 75.5 ± 10.7 μM) and 80% (71.4 ± 11.0 vs. 79.0 ± 15.4 μM) of peak work rate (WRpeak), but greater than VL and VM at WRpeak (87.7 ± 32.5 vs. 76.6 ± 17.5 and 75.1 ± 19.9 μM). RF-s was intermediate at WRpeak (82.6 ± 18.7 μM). Total hemoglobin and myoglobin concentration and tissue oxygen saturation were significantly greater in RF-d than RF-s throughout exercise. The slope of deoxy[Hb + Mb] increase (proportional to Q̇o2/V̇o2) in VL and VM slowed markedly above 70% WRpeak, whereas it became greater in RF-d. This divergent deoxygenation pattern may be due to a greater population of slow-twitch muscle fibers in the RF-d muscle and the differential recruitment profiles and vascular and metabolic control properties of specific fiber populations within superficial and deeper muscle regions.
7

Takagi, Shun. "The relationship between muscle deoxygenation and health-related physical fitness." Impact 2023, no. 2 (April 14, 2023): 48–49. http://dx.doi.org/10.21820/23987073.2023.2.48.

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Physical exercise is proven to be beneficial for health and studies have found that improved aerobic capacity is linked to reduced mortality. Dr Shun Takagi, Faculty of Education and Welfare, Biwako-Gakuin University, Japan, conducts research on the relationship between aerobic capacity and muscle deoxygenation during aerobic exercise involving different forms of exercise and different populations. Most recently, he is investigating the relationship between muscle deoxygenation during resistance training and improvement of muscle strength and thickness by resistance training. Enhancement of muscle deoxygenation during resistance exercise may be one of the determinants of muscle hypertrophy and increase in muscle strength and an improvement of muscle thickness and strength is related to improved quality of life. Therefore, the research could help enhance health among adults. If Takagi observes through his studies a strong relationship between muscle deoxygenation and health-related physical fitness, muscle deoxygenation could prove to be a useful indicator for effective exercise training to improve health-related physical fitness. Takagi and the team hope to be able to identify the determinants of muscle deoxygenation and then move onto developing effective training programmes for all generations, especially the more elderly. The researchers are utilising spatial resolved near infrared spectroscopy (SR-NIRS) in their work, as well as a newly established optical fat correction method to overcome the fact that the variables measured by SR-NIRS are affected by light scattering in the fat layer. This method has enabled the team to overcome challenges and drive their research forward.
8

Pawloski, John R. "Mechanisms of Hypoxic Erythrovasodilation." Blood 106, no. 11 (November 16, 2005): 1674. http://dx.doi.org/10.1182/blood.v106.11.1674.1674.

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Abstract Red blood cells (RBC) have the unique ability to relax blood vessels under low oxygen conditions (Pawloski et al. Nature409:622, 2001), an activity now termed hypoxic erythrovasodilation (HEV). With human erythrocytes, HEV appears to be mediated, in part, by the export of nitric oxide (NO) bioequivalents formed in the RBC membrane by nitric oxide (NO) group transfer from S-nitrosohemoglobin (SNO-Hb) to cysteine thiols in the cytoplasmic domain of the anion exchanger-1 (AE1 or band 3) protein. Alternatively, HEV has been proposed to be mediated via the nitrite reductase activity of deoxy Hb, resulting in the formation of heme-bound or nitrosyl Hb (HbNO), with subsequent export of NO from the RBC. For both paradigms, downstream export mechanisms, and a precise chemical identity of the discharged specie(s), have yet to be resolved. Interactions between RBCs and vascular tissue (i.e. endothelium and smooth muscle) involved in the HEV response remain undefined, and are the focus of the current study. Rabbit aortic rings were suspended in jacketed organ chambers filled with Krebs-bicarbonate buffer at 37°C, and bubbled continuously with either 21% O2/5% CO2 or 95% argon/5% CO2. Basal tension was maintained at 2 grams, and active tension induced with phenylephrine (PE) or prostaglandin F2a (PGF2a). Fresh (&lt;4 days) or old (&gt;60 days) RBCs were washed and resuspended in phosphate-buffered saline at 50% hematocrit prior to use. Following induction of active tension with PE or PGF2a, changing the aeration gas from O2 to argon resulted in a brisk increase in vascular tone (hypoxic vasoconstriction, HVC). At the peak of this contractile response, RBCs were added to the tissue chambers, causing a dose-dependent relaxation of the rings. There was no correlation between the magnitude of the HVC and that of the ensuing HEV. Following physical removal of the endothelium (confirmed by loss of relaxation to acetylcholine), HVC was unaffected, but HEV was reduced about 20%. In contrast, pretreating the rings with the NO scavenger Hb (100 uM), the NOS inhibitor L-NAME (10 uM), or the soluble guanylate cyclase inhibitor ODQ (10 uM), virtually abolished HVC, while augmenting the HEV response. Deoxygenating RBCs prior to use reduced HEV ~ 50% versus oxyRBCs, while treating the RBCs with carbon monoxide (CO-RBC) abolished HEV. Adding a molar equivalent of purified oxyHb (10 uM), instead of RBCs, at the peak of HVC, resulted in a comparable relaxation response. HEV activity was markedly attenuated using old RBCs, but could be fully restored by pretreating the old RBCs with aqueous NO (1:250 NO:heme) or 1 mM N-acetylcysteine (NAC). NO and NAC treatment did not enhance the HEV of fresh RBCs. In contrast, treating old RBCs with nitrite (100 or 500 nM), or adding nitrite to the tissue bath (100 or 500 nM) had no effect on the HEV response. These results demonstrate that hypoxic erythrovasodilation is a multi-mechanistic biologic response involving the vascular endothelium, oxygen transfer to substrate-limited smooth muscle inducible NOS (iNOS), and possibly a direct vasorelaxant effect on the vascular smooth muscle. Further, we have shown that hypoxic vasoconstriction can occur in non-pulmonary vascular tissue, an effect likely mediated by increased iNOS expression.
9

Chance, B., M. T. Dait, C. Zhang, T. Hamaoka, and F. Hagerman. "Recovery from exercise-induced desaturation in the quadriceps muscles of elite competitive rowers." American Journal of Physiology-Cell Physiology 262, no. 3 (March 1, 1992): C766—C775. http://dx.doi.org/10.1152/ajpcell.1992.262.3.c766.

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A simple muscle tissue spectrophotometer is adapted to measure the recovery time (TR) for hemoglobin/myoglobin (Hb/Mb) desaturation in the capillary bed of exercising muscle, termed a deoxygenation meter. The use of the instrument for measuring the extent of deoxygenation is presented, but the use of TR avoids difficulties of quantifying Hb/Mb saturation changes. The TR reflects the balance of oxygen delivery and oxygen demand in the localized muscles of the quadriceps following work near maximum voluntary contraction (MVC) in elite male and female rowers (a total of 22) on two occasions, 1 yr apart. TR ranged from 10 to 80 s and was interpreted as a measure of the time for repayment of oxygen and energy deficits accumulated during intense exercise by tissue respiration under ADP control. The Hb/Mb resaturation times provide a noninvasive localized indication of the degree of O2 delivery stress as evoked by rowing ergometry and may provide directions for localized muscle power output improvement for particular individuals in rowing competitions.
10

Stathopoulos, Alexandros, Anatoli Petridou, Nikolaos Kantouris, and Vassilis Mougios. "A Comparison of Leg Muscle Oxygenation, Cardiorespiratory Responses, and Blood Lactate between Walking and Running at the Same Speed." Sports 12, no. 2 (February 1, 2024): 48. http://dx.doi.org/10.3390/sports12020048.

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It is not known whether different gait modes, or movement patterns, at the same speed elicit differences in muscle oxygen oxygenation, expressed as muscle oxygen saturation (SmO2). Thus, the aim of this study was to compare the oxygenation of two leg muscles (vastus lateralis and gastrocnemius medialis), as well as the heart rate, respiratory gases, and blood lactate between two gait modes (walking and running) of the same speed and duration. Ten men walked and ran for 30 min each at 7 km/h in a random, counterbalanced order. SmO2, heart rate, and respiratory gases were monitored continuously. Blood lactate was measured at rest, at the end of each exercise, and after 15 min of recovery. Data were analyzed by two-way (gait mode × time) or three-way (gait mode × muscle × time) ANOVA, as applicable. Heart rate and oxygen consumption were higher when running compared to walking. SmO2 was lower during exercise compared to rest and recovery, in gastrocnemius medialis compared to vastus lateralis, and in running compared to walking. Blood lactate increased during exercise but did not differ between gait modes. In conclusion, running caused higher deoxygenation in leg muscles (accompanied by higher whole-body oxygen uptake and heart rate) than walking at the same speed (one that was comfortable for both gait modes), thus pointing to a higher internal load despite equal external load. Thus, preferring running over walking at the same speed causes higher local muscle deoxygenation, which may be beneficial in inducing favorable training adaptations.
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Статті в журналах

Дисертації з теми "Muscle deoxygenating":

1

Hiraoui, Moadh. "Caractérisation de la fatigue musculaire, réadaptation à l'effort et qualité de vie chez une population atteinte d'un cancer du sein." Electronic Thesis or Diss., Amiens, 2017. http://www.theses.fr/2017AMIE0037.

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L'objectif de ce travail était d'étudier les effets combinés d'un entrainement aérobie intermittent supervisé, d'un entrainement de renforcement musculaire et d'électrostimulation et d'un programme de marche continu à domicile, sur l'aptitude cardiorespiratoire, sur la fonction musculaire et la qualité de vie des patientes atteintes d'un cancer du sein au cours de traitement par chimiothérapie adjuvante. Les mesures ont été réalisées avant et après 6 semaines d'entrainement sur un groupe entrainé (n=20), et à 6 semaines d'intervalle sans modification de l'activité physique sur un groupe témoin (n= 12). Par comparaison avec les témoins, la première étude a montré les effets positifs de notre protocole d'entrainement sur l'aptitude aérobie et les besoins métaboliques de nos patientes entrainées. De même, la deuxième étude a révélé les importantes augmentations de la FMVi, du TE lors d'un test isométrique, et de la désoxygénation musculaire ΔHHb, suggérant une amélioration de l'utilisation de l'oxygène au niveau musculaire dans le groupe entrainé après six semaines d'entrainement. Par ailleurs, les résultats de la troisième étude ont confirmé les effets sur la fonction musculaire, en observant une amélioration de l'activité myoélectrique du vaste latéral, caractérisée par la diminution du RMS et l'augmentation du MPF lors de la phase du maintien à 50% de la FMVi, dans le groupe entrainé après les six semaines d'entrainement combiné aérobie et de renforcement musculaire. Enfin, dans la quatrième étude, nous avons observé une amélioration significative de la qualité de vie du groupe entrainé. Cette amélioration est caractérisée d'une part, par une augmentation de la qualité de vie globale et des scores aux échelles fonctionnelles, d'autre part, d'une réduction des scores des échelles de symptômes chez les cancéreuses traitées par chimiothérapie adjuvante
The objective of this investigation was to study the combined effects of supervised intermittent aerobic training, muscle strength training with electrostimulation and a continuous home-walking program, on cardiorespiratory fitness, muscle function and quality of life of patients with breast cancer during adjuvant chemotherapy period. Measurements were performed before and after 6 weeks of training on a trained group (n = 20), and 6 weeks apart without any change in physical activity on a control group (n = 12). Compared to controls, the first study showed the positive effects of our training protocol on the aerobic fitness and metabolic needs of our trained patients. Similarly, the second study revealed significant increases in MViC, ET in an isometric test, and muscle deoxygenating ΔHHb, suggesting an improvement in the use of oxygen in the muscle in the trained group after Six weeks of training. In addition, the results of the third study confirmed the effects on muscular function by observing an improvement in the myoelectric activity of the Vastus lateralis, characterized by the decrease of the RMS and the increase of the MPF during the holding phase of 50% of the MViC, in the trained group after the six weeks combined aerobic training and muscle strengthening. Finally, in the fourth study, we observed a significant improvement in the quality of life of the trained group. This improvement is characterized, on the one hand, by an increase in the overall quality of life and scores at the functional scales, and on the other hand by a reduction in the scores of symptom scales in cancer patients treated with adjuvant chemotherapy
2

Ward, Aaron Tyler. "The Effect of Sequential Lower Body Positive Pressure on Forearm Blood Flow and Muscle Deoxygenation During Dynamic Handgrip Exercise." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1461849449.

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3

Goodwin, Ashley. "Oxygen Uptake Kinetics in Skeletal Muscle Using Near-Infrared Spectroscopy (NIRS): Evaluating Healthy Responses of Muscle Deoxygenation." Thesis, 2021. https://doi.org/10.7916/d8-dn72-fw74.

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The purpose of this dissertation series was to examine oxygen uptake kinetics in skeletal muscle by evaluating responses of local muscle deoxygenation during incremental exercise in healthy individuals using near-infrared spectroscopy (NIRS). Metabolic activity in skeletal muscle, as part of the integrative responses of the cardiovascular, respiratory and neuromuscular systems, are major determinants of an individual’s physical capacity and function. The workings of these systems, called whole-body metabolism, affect the capability of an individual to engage in activities of daily living, to exercise, and participate in athletic performance. Thus, they have a strong impact on health as engagement in physical activity is well known to be effective in improving cardiorespiratory fitness and reducing the risks of chronic disease. At this time, the in vivo relationships between whole-body metabolism and local muscle metabolic activity are not well understood, but with the availability of NIRS technology this is possible. NIRS is a noninvasive optical technique used to continuously measure changes in muscle tissue oxygen saturation locally, allowing interrogation of the functional integration between muscle metabolism and the cardiovascular system in intact human beings, which is what the series of studies in this dissertation evaluate. Healthy adults and adolescents were enrolled as healthy control participants into an observational study evaluating changes in local muscle oxygen uptake in neuromuscular disease during exercise. Participants performed a maximal cardiopulmonary exercise test (CPET) on a recumbent cycle ergometer. Changes in muscle deoxygenation (HHb), reflecting local oxygen uptake, were measured using NIRS and whole-body metabolism was assessed synchronously via expired gas analysis. After an initial increase in HHb at exercise onset, a consistent pattern of plateau in HHb was observed in the healthy participants near the end of peak exercise. Despite increasing workload and oxygen uptake (VO2) in the final minutes of the test, it was unclear what mechanisms were contributing to this HHb response. It was hypothesized that the HHb-Workload relationship evaluated at the time of VO2peak would be non-linear, such that a greater maximum workload achieved at VO2peak would not be linearly matched by greater ΔHHb (i.e., greater total change from rest to VO2peak). First, a critical evaluation of the literature was conducted to explore this hypothesis. Chapter 2 provides the results of a scoping review that was performed in order to better understand the scientific evidence using NIRS that describes the relationships between indices of muscle oxygen saturation and workload during incremental exercise. This formed the basis to pursue the hypothesis-driven research presented in the subsequent chapters, interrogating the overarching question of this dissertation related to the HHb-Workload relationship. The review revealed there are three methodological approaches to examining changes in muscle oxygen saturation and workload, the least common of which was examination of HHb and workload at the VO2peak time point. Changes in muscle oxygen saturation and work have also been studied as the change in muscle oxygenation over the duration of exercise and at a certain time point or intensity during incremental exercise. Based on the literature, it was clear that there was a dearth of research examining the HHb plateau response in relation to work at VO2peak. Accordingly, chapter 3 provides the results of a pilot study that evaluated the relationship between change in HHb (ΔHHb) and the maximum workload (MW) achieved at VO2peak, where it was hypothesized that the relationship at this time point would be non-linear. A polynomial regression model was used to describe the relationship. The results of this study showed that at lower maximum workloads there were initial increases in ΔHHb with increasing maximum workload but at the highest maximum workloads, ΔHHb attenuated. A polynomial model including ΔHHb and MW, with VO2peak (an indicator of cardiorespiratory fitness) as a covariate, best characterized the relationship. Age was not significantly related to ΔHHb or MW, and VO2peak appeared to play a partial role as its inclusion as a covariate helped explain approximately a quarter of the variance, suggesting other factors may be contributing to the attenuated HHb response. From this pilot work it was hypothesized that the attenuation in ΔHHb at higher maximum workloads, and the HHb plateau observed during CPET, could be explained by muscle efficiency. If so, a longer duration and lesser slope of the HHb plateau in the minutes leading up to VO2peak occurs in muscles with higher metabolic efficiency. As muscle efficiency is defined as a ratio of external work accomplished to internal energy expended, the hypothesis, if true, would support a better matching of the internal work (VO2) to the external work (workload on the ergometer). Chapter 4 provides the results of a secondary analysis that sought to determine whether the observed plateau in HHb reflected muscular efficiency by comparing the slope of the HHb plateau (HHb[s]) to a commonly used method of assessing muscle efficiency, delta efficiency (DE). It was hypothesized that HHb[s] and DE would be inversely and significantly correlated, providing a potential mechanism for the attenuated HHb response and a noninvasive method for assessing muscle efficiency. In contrast to the hypothesis, HHb[s] and DE were not associated, suggesting that a mechanism other than muscle efficiency is contributing to the HHb plateau. Collectively, this series of studies demonstrate that there is a need to better understand the relationship between HHb and workload in healthy individuals, because of a paucity of evidence exploring the HHb-MW relationship at VO2peak, the finding that ΔHHb attenuates at higher maximum workloads, and that results suggest the HHb plateau phenomenon cannot be explained by muscle efficiency. Future work should seek to elucidate the mechanism that allows healthy individuals to achieve higher workloads (i.e., continue exercising at high intensity) without further increasing muscle oxygen uptake, in a larger more heterogeneous sample.
4

Rodriguez-Anderson, Ramón F. "The Influence of Respiratory Muscle Work on Locomotor and Respiratory Muscle Oxygenation Trends in Repeated-Sprint Exercise." Thesis, 2018. https://vuir.vu.edu.au/37831/.

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This thesis investigated the role respiratory muscle work has on locomotor and respiratory muscle oxygen (O2) utilisation during multiple sprint work. To measure O2 delivery and uptake in real time, near-infrared spectroscopy (NIRS) can be used. However, there are inconsistent methods of smoothing and determining peaks and nadirs from the NIRS signal. Therefore, the aim of study 1 was to examine the effects of different methodologies commonly used in the literature on the determination of peaks and nadirs in the vastus lateralis deoxyhaemoglobin (HHbVL) signal. Means derived from predetermined windows, irrespective of length and data smoothing, underestimated the magnitude of peak and nadir [HHbVL] compared to a rolling mean approach. Based on the results, we suggest using a digital filter to smooth NIRS data, rather than an arithmetic mean, and a rolling approach to determine peaks and nadirs for accurate interpretation of muscle oxygenation trends. In the second study, the effects of heightened inspiratory muscle work on [HHbVL] and respiratory muscle deoxyhaemoglobin ([HHbRM]) trends were examined. In response to the heightened inspiratory muscle work, HHbRM was elevated across the sprint series. There were no clear differences in HHbVL trends between exercise conditions. The lack of difference in HHbVL between trials implies respiratory muscle O2 uptake does not limit locomotor oxygenation trends. Study 3 investigated the role of arterial hypoxemia on respiratory muscle oxygenation trends, and its implications on locomotor oxygenation. While exercising in hypoxia (14.5% O2), HHbVL was higher during the sprint and recovery phases of the repeated-sprint protocol compared to normoxia (21% O2). There were no clear differences in respiratory muscle oxygenation trends between conditions. The clear reduction in locomotor muscle O2 delivery (inferred from HHbVL) while respiratory muscle oxygenation was maintained, suggests preferential blood flow distribution to the respiratory muscle to compensate for arterial hypoxemia, which may explain in part compromise locomotor O2 delivery. The aim of the final study was to examine the role of respiratory muscle strength on locomotor and respiratory muscle oxygenation trends in repeated-sprint exercise. Inspiratory muscle training (IMT) was used to reduce the relative intensity of exercise hyperpnoea by strengthening the respiratory muscles. Repeat-sprint ability was again assessed in normoxia and hypoxia. After 4 weeks of training, there was a 35% increase of inspiratory muscle pressure in the IMT beyond the control group. Despite the substantial change in respiratory muscle strength, oxygenation trends were not affected in either normoxia or hypoxia. The findings of this thesis do not support the work of breathing as being a limiting factor in locomotor muscle oxygenation in normoxia. The intermittent nature of repeated-sprint activity is likely a key mediating factor for which O2 delivery can be maintained to both the locomotor and respiratory muscles. However, under conditions of arterial hypoxemia, locomotor muscle oxygenation may be compromised by preferential O2 delivery to the respiratory muscles.

Книги з теми "Muscle deoxygenating":

1

Goodwin, Ashley. Oxygen Uptake Kinetics in Skeletal Muscle Using Near-Infrared Spectroscopy (NIRS): Evaluating Healthy Responses of Muscle Deoxygenation. [New York, N.Y.?]: [publisher not identified], 2021.

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Частини книг з теми "Muscle deoxygenating":

1

Nioka, S., D. Moser, G. Lech, M. Evengelisti, T. Verde, B. Chance, and S. Kuno. "Muscle Deoxygenation in Aerobic and Anaerobic Exercise." In Oxygen Transport to Tissue XX, 63–70. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-4863-8_8.

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2

Takagi, Shun, Ryotaro Kime, Taishi Midorikawa, Masatsugu Niwayama, Shizuo Sakamoto, and Toshihito Katsumura. "Skeletal Muscle Deoxygenation Responses During Treadmill Exercise in Children." In Advances in Experimental Medicine and Biology, 341–46. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0620-8_45.

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3

Kime, Ryotaro, Masatsugu Niwayama, Yasuhisa Kaneko, Shun Takagi, Sayuri Fuse, Takuya Osada, Norio Murase, and Toshihito Katsumura. "Muscle Deoxygenation and Its Heterogeneity Changes After Endurance Training." In Advances in Experimental Medicine and Biology, 275–81. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-38810-6_37.

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4

Takagi, Shun, Norio Murase, Ryotaro Kime, Masatsugu Niwayama, Takuya Osada, and Toshihito Katsumura. "Low Volume Aerobic Training Heightens Muscle Deoxygenation in Early Post-Angina Pectoris Patients." In Advances in Experimental Medicine and Biology, 255–61. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-38810-6_34.

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5

Kime, Ryotaro, Masatsugu Niwayama, Masako Fujioka, Kiyoshi Shiroishi, Takuya Osawa, Kousuke Shimomura, Takuya Osada, Norio Murase, and Toshihito Katsumura. "Unchanged Muscle Deoxygenation Heterogeneity During Bicycle Exercise After 6 Weeks of Endurance Training." In Advances in Experimental Medicine and Biology, 353–58. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1241-1_51.

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6

Takagi, Shun, Ryotaro Kime, Masatsugu Niwayama, Takuya Osada, Norio Murase, Shizuo Sakamoto, and Toshihito Katsumura. "Sex-Related Difference in Muscle Deoxygenation Responses Between Aerobic Capacity-Matched Elderly Men and Women." In Advances in Experimental Medicine and Biology, 55–61. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3023-4_7.

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7

Takagi, Shun, Toshihito Katsumura, and Shizuo Sakamoto. "Relationship Between Muscle Deoxygenation and Cardiac Output in Subjects Without Attenuation of Deoxygenation Hemoglobin Concentration Near the End of Ramp Cycling Exercise: A Longitudinal Study." In Advances in Experimental Medicine and Biology, 153–57. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-42003-0_24.

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8

Takagi, Shun, Ryotaro Kime, Norio Murase, Masatsugu Niwayama, Shizuo Sakamoto, and Toshihito Katsumura. "Skeletal Muscle Deoxygenation and Its Relationship to Aerobic Capacity During Early and Late Stages of Aging." In Advances in Experimental Medicine and Biology, 77–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-48238-1_12.

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9

Bowen, T. Scott, Shunsaku Koga, Tatsuro Amano, Narihiko Kondo, and Harry B. Rossiter. "The Spatial Distribution of Absolute Skeletal Muscle Deoxygenation During Ramp-Incremental Exercise Is Not Influenced by Hypoxia." In Advances in Experimental Medicine and Biology, 19–26. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3023-4_2.

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10

Morishita, Shinichiro, Atsuhiro Tsubaki, Kazuki Hotta, Sho Kojima, Daichi Sato, Akihito Shirayama, Yuki Ito, and Hideaki Onishi. "Relationship Between the Borg Scale Rating of Perceived Exertion and Leg-Muscle Deoxygenation During Incremental Exercise in Healthy Adults." In Advances in Experimental Medicine and Biology, 95–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-48238-1_15.

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Тези доповідей конференцій з теми "Muscle deoxygenating":

1

Souza, V., M. Lafeta, M. Saldanha, F. Penido, T. Menezes, S. Tanni, A. Albuquerque, et al. "Dynamic matching of oxygen uptake kinetics and muscle deoxygenation in post-COVID-19." In ERS International Congress 2022 abstracts. European Respiratory Society, 2022. http://dx.doi.org/10.1183/13993003.congress-2022.2212.

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2

Reid, Wendy Darlene, Arjun Patel, Zacherie Bergeron, Andrew Ho, Tongyu Shi, Marcelle Campos, Ewan Goligher, and Laurent Brochard. "Deoxygenation recruitment patterns of abdominal and neck muscles during four bed exercises." In ERS International Congress 2020 abstracts. European Respiratory Society, 2020. http://dx.doi.org/10.1183/13993003.congress-2020.269.

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3

Verdaguer-Codina, Joan, and Jaume A. Mirallas. "Deoxygenation and the blood volume signals in the flexor carpi ulnaris and radialis muscles obtained during the execution of the Mirallas's test of judo athletes." In BiOS Europe '96, edited by David A. Benaron, Britton Chance, and Gerhard J. Mueller. SPIE, 1996. http://dx.doi.org/10.1117/12.260843.

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