Seasonal variation of maximal oxygen consumption rate in humans

1982 ◽  
Vol 49 (2) ◽  
pp. 151-157 ◽  
Author(s):  
Thorsten Ingemann-Hansen ◽  
Jens HalkjÆr-Kristensen
Keyword(s):  
Oxygen Consumption ◽  
Seasonal Variation ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Maximal Oxygen Consumption

scholarly journals The impact of high and low atmospheric pressure in the Jordanian environment on some physiological variable for runners .

2013 ◽  
Vol 4 (2) ◽  
pp. 364
Author(s):  
Baker Thnibat
Keyword(s):  
Oxygen Consumption ◽  
Energy Expenditure ◽  
Atmospheric Pressure ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Maximal Oxygen Consumption ◽  
Training Groups ◽  
Low Atmospheric Pressure ◽  
The Impact ◽  
High Atmospheric Pressure

<p>The study aimed at identifying the impact of difference between the areas of high atmospheric pressure in the Jordanian environment on some physiological variable ( estimating maximal oxygen consumption , estimating rate of Energy expenditure, and hemoglobin ,vital capacity), for runners .</p><p>  The study sample consisted of (16) athletes who practice ( middle and long – distance running). A number of statistical methods were used to answer the questions of the study ( arithmetic means , standard deviations , Mann.Whiteny test ,and the result of Kolmogorov – Smirnov tests ) .</p><p>  The study result concluded that there was apriority for the measurements which were conducted on the training groups of low atmospheric pressure in comparison with the other group, with regard to the  variables (maximal oxygen consumption , rate of Energy expenditure, and hemoglobin). The study result also showed that there was apriority for the measurements which were conducted on the training groups of high  atmospheric pressure in comparison with the other group, regarding  to the  variables (maximal oxygen consumption , rate of Energy expenditure, and hemoglobin).in the areas of high  atmospheric pressure.</p><p>The study result also suggested that ther were no statistically significant differences between two training groups with regard to the study variables of (maximal oxygen consumption , rate of Energy expenditure, and hemoglobin ,vital capacity), were measured in  of high atmospheric pressure areas .</p><p>The study recommended about building sports facilities that simulate the areas of low atmospheric pressure , because of the expected role that the factors would play in improving some physiological variables .</p>

scholarly journals Muscle Stem Cell-Derived Extracellular Vesicles Reverse Hydrogen Peroxide-Induced Mitochondrial Dysfunction in Mouse Myotubes

Cells ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2544
Author(s):  
Kyle T. Shuler ◽  
Brittany E. Wilson ◽  
Eric R. Muñoz ◽  
Andrew D. Mitchell ◽  
Joshua T. Selsby ◽  
...  
Keyword(s):  
Stem Cell ◽  
Oxygen Consumption ◽  
Extracellular Vesicles ◽  
Mitochondrial Function ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Maximal Oxygen Consumption ◽  
Subsequent Treatment ◽  
Muscle Stem Cell ◽  
Respiratory Capacity

Muscle stem cells (MuSCs) hold great potential as a regenerative therapeutic but have met numerous challenges in treating systemic muscle diseases. Muscle stem cell-derived extracellular vesicles (MuSC-EVs) may overcome these limitations. We assessed the number and size distribution of extracellular vesicles (EVs) released by MuSCs ex vivo, determined the extent to which MuSC-EVs deliver molecular cargo to myotubes in vitro, and quantified MuSC-EV-mediated restoration of mitochondrial function following oxidative injury. MuSCs released an abundance of EVs in culture. MuSC-EVs delivered protein cargo into myotubes within 2 h of incubation. Fluorescent labeling of intracellular mitochondria showed co-localization of delivered protein and mitochondria. Oxidatively injured myotubes demonstrated a significant decline in maximal oxygen consumption rate and spare respiratory capacity relative to untreated myotubes. Remarkably, subsequent treatment with MuSC-EVs significantly improved maximal oxygen consumption rate and spare respiratory capacity relative to the myotubes that were damaged but received no subsequent treatment. Surprisingly, MuSC-EVs did not affect mitochondrial function in undamaged myotubes, suggesting the cargo delivered is able to repair but does not expand the existing mitochondrial network. These data demonstrate that MuSC-EVs rapidly deliver proteins into myotubes, a portion of which co-localizes with mitochondria, and reverses mitochondria dysfunction in oxidatively-damaged myotubes.

Microbial efficiency in a meromictic reservoir

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Grażyna Mazurkiewicz-Boroń ◽  
Teresa Bednarz ◽  
Elżbieta Wilk-Woźniak
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Release Rate ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Metabolic Efficiency ◽  
Sulphur Compounds ◽  
Carbon Dioxide Release ◽  
Microbial Efficiency ◽  
Ion Contents

Microbial efficiency in a meromictic reservoirIndices of microbial efficiency (expressed as oxygen consumption and carbon dioxide release) were determined in the water column of the meromictic Piaseczno Reservoir (in an opencast sulphur mine), which is rich in sulphur compounds. Phytoplankton abundances were low in both the mixolimnion (up to 15 m depth) and monimolimnion (below 15 m depth). In summer and winter, carbon dioxide release was 3-fold and 5-fold higher, respectively, in the monimolimnion than in the mixolimnion. Laboratory enrichments of the sulphur substrate of the water resulted in a decrease in oxygen consumption rate of by about 42% in mixolimnion samples, and in the carbon dioxide release rate by about 69% in monimolimnion samples. Water temperature, pH and bivalent ion contents were of major importance in shaping the microbial metabolic efficiency in the mixolimnion, whilst in the monimolimnion these relationships were not evident.

scholarly journals Correction: Paszkiewicz et al. A Peripheral CB1R Antagonist Increases Lipolysis, Oxygen Consumption Rate, and Markers of Beiging in 3T3-L1 Adipocytes Similar to RIM, Suggesting That Central Effects Can Be Avoided. Int. J. Mol. Sci. 2020, 21, 6639

2021 ◽  
Vol 22 (9) ◽  
pp. 4366
Author(s):  
Rebecca L. Paszkiewicz ◽  
Richard N. Bergman ◽  
Roberta S. Santos ◽  
Aaron P. Frank ◽  
Orison O. Woolcott ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Central Effects

The authors wish to make the following corrections to this paper [...]

scholarly journals Necrostatin-1 Supplementation to Islet Tissue Culture Enhances the In-Vitro Development and Graft Function of Young Porcine Islets

2021 ◽  
Vol 22 (16) ◽  
pp. 8367
Author(s):  
Hien Lau ◽  
Shiri Li ◽  
Nicole Corrales ◽  
Samuel Rodriguez ◽  
Mohammadreza Mohammadi ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Oxygen Consumption ◽  
Insulin Secretion ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
In Vitro Development ◽  
Porcine Islets ◽  
Vitro Development

Pre-weaned porcine islets (PPIs) represent an unlimited source for islet transplantation but are functionally immature. We previously showed that necrostatin-1 (Nec-1) immediately after islet isolation enhanced the in vitro development of PPIs. Here, we examined the impact of Nec-1 on the in vivo function of PPIs after transplantation in diabetic mice. PPIs were isolated from pancreata of 8–15-day-old, pre-weaned pigs and cultured in media alone, or supplemented with Nec-1 (100 µM) on day 0 or on day 3 of culture (n = 5 for each group). On day 7, islet recovery, viability, oxygen consumption rate, insulin content, cellular composition, insulin secretion capacity, and transplant outcomes were evaluated. While islet viability and oxygen consumption rate remained high throughout 7-day tissue culture, Nec-1 supplementation on day 3 significantly improved islet recovery, insulin content, endocrine composition, GLUT2 expression, differentiation potential, proliferation capacity of endocrine cells, and insulin secretion. Adding Nec-1 on day 3 of tissue culture enhanced the islet recovery, proportion of delta cells, beta-cell differentiation and proliferation, and stimulation index. In vivo, this leads to shorter times to normoglycemia, better glycemic control, and higher circulating insulin. Our findings identify the novel time-dependent effects of Nec-1 supplementation on porcine islet quantity and quality prior to transplantation.

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