respiratory quotient


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respiratory quotient

n. Abbr. RQ
The ratio of the volume of carbon dioxide released to the volume of oxygen consumed by a body tissue or an organism in a given period.

respiratory quotient

n
(Biology) biology the ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism, tissue, or cell in a given time

res′piratory quo`tient


n.
the ratio of carbon dioxide released by the lungs to oxygen taken in during a given period.
[1885–90]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.respiratory quotient - the ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism or cell in a given period of time
ratio - the relative magnitudes of two quantities (usually expressed as a quotient)
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References in periodicals archive ?
Dilly O (2003) Regulation of the respiratory quotient of soil microbiota by availability of nutrients.
Variable 1st assessment 2nd assessment during at the end of residential outpatient treatment treatment (1-year follow-up) Fat-free mass percentage (%) 44.80 47.40 Fat-free mass (kg) 43.85 44.66 Fat mass percentage (%) 54.7 52.0 Fat mass (kg) 52.91 48.47 Trunk fat percentage (%) 57.00 55.00 Neck femoral BMD (g/[cm.sup.2]) 0.655 0.681 Measured resting energy 1589 1491 expenditure (mREE) (kcal/d) Respiratory quotient (RQ) 0.74 0.82 Creatinine (mg/dl) 0.10 0.10 Glucose (mg/dl) 87 90 Insulin ([micro]U/ml) 27.8 20 HOMA index 5.97 4.64 Total cholesterol (mg/dl) 184 169 HDL cholesterol (mg/dl) 47 47 LDL cholesterol (mg/dl) 121 106 C-reactive protein (mg/dl) 1.46 1.13 Fibrinogen (mg/dl) 433 413 Erythrocyte sedimentation rate 29 24 (mm/h)
(1) Respiratory quotient (RQ = ratio of C[O.sub.2] moles produced per unit mole [O.sub.2] consumed) used in the biological literature is applied to combustion of fossil and biomass fuels in order to rank their potential in producing global warming C[O.sub.2] (C[O.sub.2] in tons per GJ [approximately equal to] RQ * 0.1 and C[O.sub.2] in short tons per MMBtu = RQ * 0.116).
The respiratory quotient, RQ is the ratio of the volumetric rate at which C[O.sub.2] is produced to the rate at which oxygen is consumed, and its value depends primarily on diet.
AA, African- American; BMI, body mass index; EA, European-American; RCR, respiratory control ratio; RQ, respiratory quotient; VAT, visceral adipose tissue.
2.0 kPa C[O.sub.2] promotes changes in respiratory quotient during storage time, keep higher mass loss in function of respiration (C[O.sub.2] losses) and lower soluble solids after storage.
Indirect calorimetry measures showed decreased energy expenditure on no-breakfast days and a significantly reduced respiratory quotient, which indicates greater fat oxidation, she said.
The circadian rhythms of food and water consumption, the number of feeding anddrinking episodes, oxygen consumption, carbon dioxide production, respiratory quotient, gross motor activity, and body temperature were measured in male B6C3F1 mice that were fed ad libitum (AL) or fed a caloric-restricted diet (CR).
A study in endurance athletes has shown that L-carnitine supplementation decreases the respiratory quotient (RQ) during a 45 minute cycling exercise, indicating a glycogen sparing effect, which is thought to lead to improved performance and a delayed onset of fatigue.
Respiratory quotient and calcification of Nautilus macromphalus (Cephalopoda: Nautiloidea).
Mean [V.sub.E], V[O.sub.2], VC[O.sub.2], nonprotein respiratory quotient (npRQ), HR, [O.sub.2] pulse, ventilatory equivalents for oxygen ([V.sub.E]/V[O.sub.2]) and carbon dioxide ([V.sub.E]/VC[O.sub.2]) were measured during the last 10 min of the workload of 7.0 km/hr.

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