respiratory quotient


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quotient

 [kwo´shent]
a number obtained by division.
achievement quotient the achievement age divided by the mental age, indicating progress in learning.
caloric quotient the heat evolved (in calories) divided by the oxygen consumed (in milligrams) in a metabolic process.
intelligence quotient IQ; a numerical expression of intellectual capacity obtained by multiplying the mental age of the subject, ascertained by testing, by 100 and dividing by the chronological age.
respiratory quotient RQ; the ratio of the volume of carbon dioxide given off by the body tissues to the volume of oxygen absorbed by them; usually equal to the corresponding volumes given off and taken up by the lungs. It varies with the fuel source used: for carbohydrates it is 1.0; for lipids 0.7; for proteins 0.8; and with overfeeding (lipogenesis) 1.0–1.3.

res·pi·ra·to·ry quo·tient (R.Q., RQ),

the steady-state ratio of carbon dioxide produced by tissue metabolism to oxygen consumed in the same metabolism; for the whole body, normally about 0.82 under basal conditions; in the steady state, the respiratory quotient is equal to the respiratory exchange ratio.

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 (RQ)

the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed per unit of time by the body under steady-state conditions. Depending on the net metabolic needs of all parts of the body at a given moment, the ratio ranges from 0.7 to 1 and averages around 0.8. The RQ varies for different metabolic fuels: the RQ of fat is lower than that of protein, which is lower than that of glucose. Also called metabolic respiratory quotient.

res·pi·ra·to·ry quo·tient

(RQ) (res'pir-ă-tōr-ē kwō'shĕnt)
The ratio of the carbon dioxide produced during tissue metabolism to the oxygen consumed; reflects net substrate oxidation; can be determined by indirect calorimetry.

respiratory quotient (RQ)

the ratio of the volume of CO2 produced to the volume of O2 taken up in a given period of time. From RQ estimates it is possible to deduce what type of food is being oxidized. Carbohydrates have an RQ of 1.0, fats of 0.7 and proteins 0.9. An RQ lower than 0.7 indicates that organic acids such as malic acid are being oxidized (see CRASSULACEAN ACID METABOLISM): an RQ greater than 1.0 indicates that ANAEROBIC RESPIRATION is occurring.

quotient

a number obtained by division.

caloric quotient
the heat evolved (in calories) divided by the oxygen consumed (in milligrams) in a metabolic process.
respiratory quotient
see respiratory quotient.
References in periodicals archive ?
Technologies developed, and under development, offer the first affordable and accurate techniques for determination of human metabolic rate, body mass, respiratory quotient and percentage body fat.
A study in endurance athletes has shown that L-carnitine supplementation decreases their respiratory quotient (RQ) during a 45-minute cycling exercise--indicating a glycogen sparing effect that is thought to lead to improved performance and delayed fatigue onset.
Respiratory quotient (RQ) is also the measurement of VCO2/VO2, but at the cellular level, while the measurement end tidally is RER.

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