scholarly journals Effect of moderate and Severe Hypoxic exposure coupled with fatigue on psychomotor vigilance testing, muscle tissue oxygenation, and muscular performance

2021 ◽  
Author(s):  
Cory M. Smith ◽  
Owen F. Salmon ◽  
Jasmin R. Jenkins
Keyword(s):  
Muscle Tissue ◽  
Tissue Oxygenation ◽  
Hypoxic Exposure ◽  
Muscular Performance ◽  
Psychomotor Vigilance

Muscle tissue oxygenation, pressure, electrical, and mechanical responses during dynamic and static voluntary contractions

2004 ◽  
Vol 96 (2) ◽  
pp. 165-177 ◽  
Author(s):  
Pernille Vedsted ◽  
Anne Katrine Blangsted ◽  
Karen Søgaard ◽  
Claudio Orizio ◽  
Gisela Sjøgaard
Keyword(s):  
Muscle Tissue ◽  
Tissue Oxygenation ◽  
Mechanical Responses ◽  
Voluntary Contractions

scholarly journals Comparison of muscle tissue oxygenation response curves to two time-based vascular occlusion tests: evidence of diminishing returns?

Critical Care ◽  
2009 ◽  
Vol 13 (Suppl 1) ◽  
pp. P240
Author(s):  
SJ Thomson ◽  
N Al-Subaie ◽  
M Hamilton ◽  
ML Cowan ◽  
S Musa ◽  
...  
Keyword(s):  
Muscle Tissue ◽  
Tissue Oxygenation ◽  
Vascular Occlusion ◽  
Response Curves ◽  
Diminishing Returns

scholarly journals Investigation of microvascular morphological measures for skeletal muscle tissue oxygenation by image-based modelling in three dimensions

2017 ◽  
Vol 14 (135) ◽  
pp. 20170635 ◽  
Author(s):  
B. Zeller-Plumhoff ◽  
K. R. Daly ◽  
G. F. Clough ◽  
P. Schneider ◽  
T. Roose
Keyword(s):  
Skeletal Muscle ◽  
Muscle Tissue ◽  
Cross Sections ◽  
Tissue Oxygenation ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Capillary Density ◽  
Three Dimensions ◽  
Two Dimensional ◽  
Contrast Imaging

The supply of oxygen in sufficient quantity is vital for the correct functioning of all organs in the human body, especially for skeletal muscle during exercise. Traditionally, microvascular oxygen supply capability is assessed by the analysis of morphological measures on transverse cross-sections of muscle, e.g. capillary density or capillary-to-fibre ratio. In this work, we investigate the relationship between microvascular structure and muscle tissue oxygenation in mice. Phase contrast imaging was performed using synchrotron radiation computed tomography (SR CT) to visualize red blood cells (RBCs) within the microvasculature in mouse soleus muscle. Image-based mathematical modelling of the oxygen diffusion from the RBCs into the muscle tissue was subsequently performed, as well as a morphometric analysis of the microvasculature. The mean tissue oxygenation was then compared with the morphological measures of the microvasculature. RBC volume fraction and spacing (mean distance of any point in tissue to the closest RBC) emerged as the best predictors for muscle tissue oxygenation, followed by length density (summed RBC length over muscle volume). The two-dimensional measures of capillary density and capillary-to-fibre ratio ranked last. We, therefore, conclude that, in order to assess the states of health of muscle tissue, it is advisable to rely on three-dimensional morphological measures rather than on the traditional two-dimensional measures.

scholarly journals Heart Rate and Muscle Oxygenation Kinetics During Dynamic Constant Load Intermittent Breath-Holds

2021 ◽  
Vol 12 ◽  
Author(s):  
Janne Bouten ◽  
Sander De Bock ◽  
Gil Bourgois ◽  
Sarah de Jager ◽  
Jasmien Dumortier ◽  
...  
Keyword(s):  
Heart Rate ◽  
Muscle Tissue ◽  
Near Infrared ◽  
Tissue Oxygenation ◽  
Oxygenation Index ◽  
Hemoglobin Concentration ◽  
Muscle Oxygenation ◽  
Peak Power Output ◽  
Breath Hold ◽  
Peripheral Vasoconstriction

Introduction: Acute apnea evokes bradycardia and peripheral vasoconstriction in order to conserve oxygen, which is more pronounced with face immersion. This response is contrary to the tachycardia and increased blood flow to muscle tissue related to the higher oxygen consumption during exercise. The aim of this study was to investigate cardiovascular and metabolic responses of dynamic dry apnea (DRA) and face immersed apnea (FIA).Methods: Ten female volunteers (17.1 ± 0.6 years old) naive to breath-hold-related sports, performed a series of seven dynamic 30 s breath-holds while cycling at 25% of their peak power output. This was performed in two separate conditions in a randomized order: FIA (15°C) and DRA. Heart rate and muscle tissue oxygenation through near-infrared spectroscopy were continuously measured to determine oxygenated (m[O2Hb]) and deoxygenated hemoglobin concentration (m[HHb]) and tissue oxygenation index (mTOI). Capillary blood lactate was measured 1 min after the first, third, fifth, and seventh breath-hold.Results: Average duration of the seven breath-holds did not differ between conditions (25.3 s ± 1.4 s, p = 0.231). The apnea-induced bradycardia was stronger with FIA (from 134 ± 4 to 85 ± 3 bpm) than DRA (from 134 ± 4 to 100 ± 5 bpm, p < 0.001). mTOI decreased significantly from 69.9 ± 0.9% to 63.0 ± 1.3% (p < 0.001) which is reflected in a steady decrease in m[O2Hb] (p < 0.001) and concomitant increase in m[HHb] (p = 0.001). However, this was similar in both conditions (0.121 < p < 0.542). Lactate was lower after the first apnea with FIA compared to DRA (p = 0.038), while no differences were observed in the other breath-holds.Conclusion: Our data show strong decreases in heart rate and muscle tissue oxygenation during dynamic apneas. A stronger bradycardia was observed in FIA, while muscle oxygenation was not different, suggesting that FIA did not influence muscle oxygenation. An order of mechanisms was observed in which, after an initial tachycardia, heart rate starts to decrease after muscle tissue deoxygenation occurs, suggesting a role of peripheral vasoconstriction in the apnea-induced bradycardia. The apnea-induced increase in lactate was lower in FIA during the first apnea, probably caused by the stronger bradycardia.

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