Measured pulmonary oxygen consumption: difference between systemic oxygen uptake measured by the reverse Fick method and indirect calorimetry in cardiac surgery

(Na+ + K+)-dependent ATPase activity, heat production and oxygen consumption were increased by 59%, 62% and 75% respectively in hepatocytes from tri-iodothyronine-treated rats. Ouabain at concentrations of 1 and 10 mM decreased oxygen uptake by 2-8% in hepatocytes from euthyroid rats and by 5-15% in hepatocytes from hyperthyroid animals. Heat output was decreased by 4-9% with the glycoside in isolated liver parenchymal cells from the control animals and by 11% in the cells from the tri-iodothyronine-treated animals. These results do not support the hypothesis that hepatic (Na+ + K+)-ATPase plays a major role in increased heat production in hepatocytes from hyperthyroid rats.

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Effects of atrial natriuretic peptide (ANP) and furosemide on renal oxygen consumption and haemodynamics after cardiac surgery

European Journal of Anaesthesiology ◽

10.1097/00003643-200219271-00073 ◽

2002 ◽

Vol 19 (Supplement 27) ◽

pp. 24-25

Author(s):

K. Swärd ◽

F. Valson ◽

J. Sellgren ◽

S.-E. Ricksten

Keyword(s):

Cardiac Surgery ◽

Oxygen Consumption ◽

Atrial Natriuretic Peptide ◽

Natriuretic Peptide ◽

Renal Oxygen Consumption ◽

Renal Oxygen ◽

Atrial Natriuretic

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The effect of the acanthocephalan Pomphorhynchus laevis upon the respiration of its intermediate host, Gammarus pulex

Parasitology ◽

10.1017/s0031182000045789 ◽

1974 ◽

Vol 68 (2) ◽

pp. 271-284 ◽

Cited By ~ 39

Author(s):

A. E. Rumpus ◽

C. R. Kennedy

Keyword(s):

Oxygen Consumption ◽

Oxygen Uptake ◽

Host Population ◽

Gammarus Pulex ◽

Multiple Infections ◽

Pomphorhynchus Laevis ◽

Respiration Rates ◽

Physiological Processes ◽

Stage Of Development ◽

Host Parasite

The respiration rates of individual Gammarus pulex infected by larval Pomphorhynchus laevis were investigated with particular reference to the stage of development of the host and parasite and to the water temperature. At 20°C the oxygen consumption of Gammarus of all sizes was reduced by an average of 19·3 % by the presence of cystacanths of the parasite, but was unaffected by the presence of acanthellae. It is considered that the small size of this larval stage, in relation to that of its host, is responsible for the failure to detect an effect. Multiple infections did not exert any greater effect upon host respiration than single cystacanths, nor did it appear that the parasite had different effects upon hosts of different sexes. At 10°C no significant differences were observed between the respiration rates of infected and uninfected gammarids. The parasite was probably still depressing the host respiration rate at this temperature, but the oxygen uptake of G. pulex is so low that the differences between infected and uninfected individuals were too small to be detected. The parasite has a direct effect upon the physiological processes of the host, but neither the mechanism of this nor the reasons for the different effects found in different host-parasite systems are yet understood. Despite the pronounced effect of P. laevis on respiration of individual hosts, its effect upon the oxygen consumption of a natural host population is small since only a small proportion of the population carries infections and water temperatures remain below 10°C for over half the year.

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Vastus lateralis oxygenation during prolonged cycling in healthy males

Applied Physiology Nutrition and Metabolism ◽

10.1139/h05-001 ◽

2006 ◽

Vol 31 (1) ◽

pp. 48-55 ◽

Cited By ~ 8

Author(s):

Kotaro Kawaguchi ◽

Yukiko Hayashi ◽

Kiyokazu Sekikawa ◽

Mitsuru Tabusadani ◽

Tsutomu Inamizu ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Oxygen Uptake ◽

Blood Volume ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Vastus Lateralis ◽

Muscle Oxygenation ◽

Cardiovascular Drift ◽

Systemic Oxygen ◽

The Relationship

This study examined the relationship between acute cardiorespiratory and muscle oxygenation and blood volume changes during prolonged exercise. Eight healthy male volunteers (mean maximum oxygen uptake ([Formula: see text]O2max) = 41.6 ± 2.4 mL/kg/min) performed 60 min submaximal cycling at 50% [Formula: see text]O2max. Oxygen uptake ([Formula: see text]O2) was measured by indirect spirometry, cardiac output (CO) was estimated using a PortapresTM, and right vastus lateralis oxyhemoglobin/ myoglobin (oxyHb/Mb), deoxyhemoglobin/myoglobin (deoxyHb/Mb), and total hemoglobin/myoglobin (total Hb/Mb) were recorded using near-infrared spectroscopy (NIRS). After 40 min of exercise, there was a significant increase in [Formula: see text]O2 due to a significantly higher arteriovenous oxygen difference ((a - v)O2diff). After 30 min of exercise CO remained unchanged, but there was a significant decrease in stroke volume and a proportionate increase in heart rate, thus indicating the occurrence of cardiovascular drift. During the first few minutes of exercise, there was a decline in oxyHb/Mb and total Hb/Mb, whereas deoxyHb/Mb remained unchanged. Thereafter, oxyHb/Mb and total Hb/Mb increased systematically until the termination of exercise while deoxyHb/Mb declined. After 40 min of exercise, these changes were significantly different from the baseline values. There were no significant correlations between the changes in the NIRS variables and systemic [Formula: see text]O2 or mixed (a - v)O2diff during exercise. These results suggest that factors other than localized changes in muscle oxygenation and blood volume account for the increased [Formula: see text]O2 during prolonged submaximal exercise. Key words: near infrared spectroscopy, cardiovascular drift, systemic oxygen consumption.

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Oxygen consumption in the early postinjury period: Use of continuous, on-line indirect calorimetry

Critical Care Medicine ◽

10.1097/00003246-200002000-00018 ◽

2000 ◽

Vol 28 (2) ◽

pp. 395-401 ◽

Cited By ~ 19

Author(s):

Joel R. Peerless ◽

Carol D. Epstein ◽

James E. Martin ◽

Alfred C. Pinchak ◽

Mark A. Malangoni

Keyword(s):

Oxygen Consumption ◽

Indirect Calorimetry ◽

On Line

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Oxygen uptake during mineralization of photosynthesized carbon from phytoplankton of the Barra Bonita Reservoir: a mesocosm study

Brazilian Journal of Biology ◽

10.1590/s1519-69842008000100016 ◽

2008 ◽

Vol 68 (1) ◽

pp. 115-122 ◽

Cited By ~ 5

Author(s):

MB. Cunha-Santino ◽

SP. Gouvêa ◽

I. Bianchini Jr ◽

AAH. Vieira

Keyword(s):

Electrical Conductivity ◽

Oxygen Consumption ◽

Oxygen Uptake ◽

Dissolved Oxygen ◽

Water Samples ◽

Microbial Respiration ◽

Co2 Concentration ◽

Ph Values ◽

Organic Products ◽

Aulacoseira Granulata

This study aimed to discuss and describe the oxygen consumption during aerobic mineralization of organic products (cells and excretion products) from five unialgal cultures: Cryptomonas sp., Microcystis aeruginosa, Anabaena spiroides, Thalassiosira sp. and Aulacoseira granulata. These species were isolated from Barra Bonita reservoir (22º 29’ S and 48º 34’ W) and cultivated in the laboratory. From each culture, two decomposition chambers were prepared; each chamber contained about 130 mg.L-1 of carbon from water samples of the reservoir. The chambers were aerated and incubated in the dark at 20.0 ºC. The concentration of dissolved oxygen, pH values and electrical conductivity of the solutions were determined during a period of 10 days. The results indicated increases in oxygen consumption for all the solutions studied and also for electrical conductivity. The pH values presented a decreasing tendency throughout the experiment. Oxygen consumption varied from 43 (Aulacoseira granulata chamber) to 345 mg O2 g-1 C (Anabaena spiroides chamber). Decrease in pH values was probably due to increase in CO2 concentration from microbial respiration. Increase in electrical conductivity might be due to the liberation of ions during decomposition. The results demonstrate the potentiality of the studied genera in influencing oxygen availability followed by a die-off event. It also indicates the possibility of changing of the electrical conductivity and pH values in the water column due the aerobic algae mineralization.

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